/* ==========================================================================
 * Components — Table of Contents
 * ==========================================================================
 *  1. Focus / Accessibility ............. line 16
 *  2. Buttons & Toggles ................. line 89
 *  3. Terminal & Skill Cards ............ line 203
 *  4. Timeline & Project Cards .......... line 410
 *  5. Contact & Copy .................... line 1157
 *  6. ETC (Certifications) .............. line 1363
 *  7. Scroll Progress ................... line 1785
 *  8. Hero & Impact ..................... line 1803
 *  9. Experience Accordion .............. line 1982
 * 10. Project Modal ..................... line 2138
 * ========================================================================== */

/* ================================
   Global Focus Styles (Accessibility)
   ================================ */

/* Default focus-visible for all interactive elements */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Enhanced focus for dark mode */
[data-theme="dark"] :focus-visible {
  outline-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(0, 217, 255, 0.2);
}

/* Remove default outline for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* Button focus states */
.btn:focus-visible,
.projects__filter-btn:focus-visible,
.project-action-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Nav link focus states */
.nav__link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* Toggle button focus states */
#theme-toggle:focus-visible,
#lang-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Card focus states (for keyboard navigation) */
.project-card:focus-visible,
.skill-card:focus-visible,
.contact-card:focus-visible,
.education-card:focus-visible,
.etc-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-color: var(--color-primary);
}

/* Modal close button focus */
.modal__close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Timeline expand button focus */
.timeline__expand-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Copy button focus */
.contact-card__copy:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  opacity: 1;
}

/* ================================
   Buttons
   ================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn--primary {
  background-color: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

/* Terminal Window */
.terminal {
  background-color: var(--color-code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
}

[data-theme="dark"] .terminal__header {
  background-color: var(--color-surface-elevated);
}

.terminal__dots {
  display: flex;
  gap: var(--space-2);
}

.terminal__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-text-muted);
  opacity: 0.3;
}

.terminal__dot--red { background-color: var(--color-text-muted); }
.terminal__dot--yellow { background-color: var(--color-text-muted); }
.terminal__dot--green { background-color: var(--color-text-muted); }

.terminal__title {
  flex: 1;
  text-align: center;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.terminal__body {
  padding: var(--space-6);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: 1.8;
}

.terminal__line {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--space-2);
}

.terminal__prompt {
  color: var(--color-code-green);
  margin-right: var(--space-2);
  user-select: none;
}

.terminal__command {
  color: var(--color-text-primary);
}

.terminal__output {
  color: var(--color-text-secondary);
  padding-left: var(--space-6);
}

/* Syntax highlighting */
.code-keyword { color: var(--color-code-purple); }
.code-string { color: var(--color-code-green); }
.code-function { color: var(--color-code-yellow); }
.code-variable { color: var(--color-code-cyan); }
.code-comment { color: var(--color-text-muted); font-style: italic; }

/* Glow button variant */
.btn--glow {
  box-shadow: var(--glow-primary);
  transition: all var(--transition-fast);
}

.btn--glow:hover {
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.4);
}

/* Skill Card */
.skill-card {
  background-color: var(--color-surface);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.skill-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.skill-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(5, 83, 177, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.skill-card__icon svg {
  width: 20px;
  height: 20px;
}

.skill-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
}

.skill-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.skill-card__list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding-left: var(--space-4);
  position: relative;
}

.skill-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

/* Skill Progress Bar */
.skill-progress {
  margin-top: var(--space-4);
}

.skill-progress__item {
  margin-bottom: var(--space-3);
}

.skill-progress__item:last-child {
  margin-bottom: 0;
}

.skill-progress__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-1);
}

.skill-progress__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.skill-progress__level {
  font-size: var(--font-size-xs);
  font-family: var(--font-family-mono);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.skill-progress__bar {
  height: 4px;
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-progress__fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  width: 0;
  transition: width 1s ease-out;
}

.skill-progress__fill.animate {
  width: var(--progress);
}

/* Timeline Components */
.timeline__period {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}

.timeline__company {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-1);
}

.timeline__role {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-3);
}

.timeline__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.timeline__tags li {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-3);
  background-color: rgba(5, 83, 177, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
}

/* Project Card - Simplified Design */
.project-card {
  background-color: var(--color-surface);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.project-card::after {
  display: none;
}

.project-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.project-card:hover::before {
  opacity: 1;
}

/* Project-specific backgrounds removed for cleaner design */

.project-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-2);
  gap: var(--space-3);
  flex-shrink: 0;
}

.project-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.35;
}

.project-card__badge {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-accent);
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

/* Category-specific badge colors for project cards */
.project-card[data-category="personal"] .project-card__badge {
  background-color: rgba(139, 92, 246, 0.15);
  color: var(--filter-personal);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.project-card[data-category="company"] .project-card__badge {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--filter-company);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.project-card[data-category="learning"] .project-card__badge {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--filter-learning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Dark mode category badge colors */
[data-theme="dark"] .project-card[data-category="personal"] .project-card__badge {
  background-color: rgba(167, 139, 250, 0.2);
  color: var(--filter-personal);
  border-color: rgba(167, 139, 250, 0.4);
}

[data-theme="dark"] .project-card[data-category="company"] .project-card__badge {
  background-color: rgba(52, 211, 153, 0.2);
  color: var(--filter-company);
  border-color: rgba(52, 211, 153, 0.4);
}

[data-theme="dark"] .project-card[data-category="learning"] .project-card__badge {
  background-color: rgba(251, 191, 36, 0.2);
  color: var(--filter-learning);
  border-color: rgba(251, 191, 36, 0.4);
}

.project-card__summary {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-2-5);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card__highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-1-5);
  margin-bottom: var(--space-3);
  flex-shrink: 0;
}

.project-card__highlights li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.project-card__highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  flex-shrink: 0;
}

.project-card__tech li {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: var(--space-1) var(--space-2-5);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.project-card__tech li:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.project-card__actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border-light);
}

.project-card__detail-btn {
  min-height: 40px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid rgba(5, 83, 177, 0.25);
  background-color: rgba(5, 83, 177, 0.08);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.project-card__detail-btn:hover {
  background-color: rgba(5, 83, 177, 0.14);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.project-card__links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  isolation: isolate;
  flex-shrink: 0;
}

.project-action-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: white;
  background: var(--gradient-primary);
  border: none;
  box-shadow: 0 10px 22px rgba(5, 83, 177, 0.25);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
  position: relative;
  z-index: 1;
}

.project-action-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.project-action-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(5, 83, 177, 0.3);
  filter: brightness(1.02);
}

.project-action-link--demo {
  color: var(--color-text-primary);
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.9) 0%, rgba(77, 232, 255, 0.9) 45%, rgba(5, 83, 177, 0.9) 100%);
}

.project-action-link--demo:hover {
  filter: brightness(1.05);
}

.project-card__private {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px dashed var(--color-border);
  background-color: var(--color-background);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* Project Filter Bar */
.projects__filter {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.projects__filter-btn {
  padding: var(--space-2) var(--space-3);
  min-height: var(--space-10);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--filter-inactive-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.projects__filter-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(5, 83, 177, 0.05);
}

/* Category-specific filter button colors */
.projects__filter-btn[data-filter="all"].active {
  color: white;
  background-color: var(--filter-all);
  border-color: var(--filter-all);
}

.projects__filter-btn[data-filter="personal"].active {
  color: white;
  background-color: var(--filter-personal);
  border-color: var(--filter-personal);
}

.projects__filter-btn[data-filter="company"].active {
  color: white;
  background-color: var(--filter-company);
  border-color: var(--filter-company);
}

.projects__filter-btn[data-filter="learning"].active {
  color: white;
  background-color: var(--filter-learning);
  border-color: var(--filter-learning);
}

/* Hover states for each category */
.projects__filter-btn[data-filter="all"]:hover {
  color: var(--filter-all);
  border-color: var(--filter-all);
  background-color: rgba(5, 83, 177, 0.08);
}

.projects__filter-btn[data-filter="personal"]:hover {
  color: var(--filter-personal);
  border-color: var(--filter-personal);
  background-color: rgba(139, 92, 246, 0.08);
}

.projects__filter-btn[data-filter="company"]:hover {
  color: var(--filter-company);
  border-color: var(--filter-company);
  background-color: rgba(16, 185, 129, 0.08);
}

.projects__filter-btn[data-filter="learning"]:hover {
  color: var(--filter-learning);
  border-color: var(--filter-learning);
  background-color: rgba(245, 158, 11, 0.08);
}

/* Dark mode hover states */
[data-theme="dark"] .projects__filter-btn[data-filter="all"]:hover {
  background-color: rgba(0, 217, 255, 0.1);
}

[data-theme="dark"] .projects__filter-btn[data-filter="personal"]:hover {
  background-color: rgba(167, 139, 250, 0.12);
}

[data-theme="dark"] .projects__filter-btn[data-filter="company"]:hover {
  background-color: rgba(52, 211, 153, 0.12);
}

[data-theme="dark"] .projects__filter-btn[data-filter="learning"]:hover {
  background-color: rgba(251, 191, 36, 0.12);
}

/* Dark mode active states */
[data-theme="dark"] .projects__filter-btn[data-filter="all"].active,
[data-theme="dark"] .projects__filter-btn[data-filter="personal"].active,
[data-theme="dark"] .projects__filter-btn[data-filter="company"].active,
[data-theme="dark"] .projects__filter-btn[data-filter="learning"].active {
  color: var(--color-background);
}

/* Project Card Badges Container */
.project-card__badges {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Project Status Badge - Simplified */
.project-card__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.6rem;
  font-weight: var(--font-weight-semibold);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project-card__status::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: var(--radius-full);
  background-color: currentColor;
}

/* Live - Clean green */
.project-card__status--live {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.project-card__status--live::before {
  animation: simplePulse 3s ease-in-out infinite;
}

/* Dev - Clean yellow */
.project-card__status--dev {
  background-color: var(--color-warning-light);
  color: var(--badge-dev-color);
}

/* Archive - Muted */
.project-card__status--archive {
  background-color: var(--color-border-light);
  color: var(--color-text-muted);
}

/* Simplified pulse animation */
@keyframes simplePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Project Card Filter Animation - Simplified */
.project-card {
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity 0.3s ease,
    filter 0.3s ease,
    transform var(--transition-fast);
}

.project-card[data-filter-hidden="true"] {
  opacity: 0;
  filter: blur(4px);
  transform: scale(0.92);
  pointer-events: none;
  position: absolute;
  visibility: hidden;
  transition:
    opacity 0.25s ease,
    filter 0.25s ease,
    transform 0.25s ease,
    visibility 0s linear 0.25s;
}

.project-card.filter-fade-out {
  opacity: 0;
  filter: blur(4px);
  transform: scale(0.92);
  transition: opacity 0.25s ease, filter 0.25s ease, transform 0.25s ease;
}

.project-card.filter-fade-in {
  animation: filterFadeIn 0.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes filterFadeIn {
  from {
    opacity: 0;
    filter: blur(4px);
    transform: translateY(12px) scale(0.92);
  }
  to {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0) scale(1);
  }
}

/* Featured Project - 그라디언트 테두리 & 글로우 (확장형) */
.project-card--featured {
  position: relative;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--color-surface), var(--color-surface)) padding-box,
    linear-gradient(135deg, var(--color-primary) 0%, #00d9ff 100%) border-box;
  box-shadow:
    0 8px 24px rgba(5, 83, 177, 0.14),
    0 0 28px rgba(5, 83, 177, 0.08);
  padding: var(--space-5);
}

.project-card--featured .project-card__title {
  font-size: var(--font-size-2xl);
}

.project-card--featured .project-card__summary {
  font-size: var(--font-size-base);
  -webkit-line-clamp: 2;
}

.project-card--featured::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, var(--color-primary), #00d9ff);
  border-radius: inherit;
  z-index: -1;
  opacity: 0.1;
  filter: blur(16px);
}

.project-card--featured:hover {
  transform: translateY(-4px);
  box-shadow:
    0 14px 32px rgba(5, 83, 177, 0.16),
    0 0 40px rgba(5, 83, 177, 0.1);
}

/* 다크모드 */
[data-theme="dark"] .project-card--featured {
  background:
    linear-gradient(var(--color-surface), var(--color-surface)) padding-box,
    linear-gradient(135deg, #00d9ff 0%, var(--color-primary) 100%) border-box;
  box-shadow:
    0 8px 24px rgba(0, 217, 255, 0.16),
    0 0 32px rgba(0, 217, 255, 0.1);
}

[data-theme="dark"] .project-card--featured::before {
  background: linear-gradient(135deg, #00d9ff, var(--color-primary));
}

[data-theme="dark"] .project-card--featured:hover {
  box-shadow:
    0 14px 32px rgba(0, 217, 255, 0.22),
    0 0 42px rgba(0, 217, 255, 0.14);
}

/* Featured badge removed for cleaner design */

/* Dark Mode - Clean */
[data-theme="dark"] .project-card {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .project-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
}

[data-theme="dark"] .project-card__summary {
  color: var(--color-text-primary);
}

[data-theme="dark"] .project-card__highlights li {
  color: var(--color-text-secondary);
}

[data-theme="dark"] .project-card__detail-btn {
  background-color: rgba(0, 217, 255, 0.12);
  border-color: rgba(0, 217, 255, 0.28);
  color: var(--color-primary);
}

[data-theme="dark"] .project-card__detail-btn:hover {
  background-color: rgba(0, 217, 255, 0.18);
}

[data-theme="dark"] .project-action-link {
  color: #062130;
  background: var(--modal-accent);
  border: 1px solid var(--modal-accent);
  box-shadow: none;
  filter: none;
}

[data-theme="dark"] .project-action-link:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  color: #031824;
  filter: none;
}

[data-theme="dark"] .project-action-link--demo {
  color: var(--modal-text-high);
  background: var(--modal-panel-soft);
  border: 1px solid var(--modal-chip-border);
}

[data-theme="dark"] .project-action-link--demo:hover {
  background: rgba(0, 217, 255, 0.18);
  color: var(--modal-text-high);
  border-color: var(--modal-accent);
}

[data-theme="dark"] .project-card__private {
  border-color: var(--color-border);
  background-color: var(--color-surface-elevated);
  color: var(--color-text-secondary);
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .project-card,
  .project-card::before,
  .project-card__tech li,
  .project-card__detail-btn,
  .project-action-link,
  .project-action-link svg {
    transition: none !important;
  }

  .project-card__status--live::before {
    animation: none;
  }

  .project-card.filter-fade-in {
    animation: none;
    opacity: 1;
  }
}

/* Education Timeline Card */
.education-card {
  position: relative;
  background-color: var(--color-surface);
  padding: var(--space-6);
  padding-left: var(--space-12);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  flex: 1;
  max-width: 400px;
}

/* Timeline marker (mobile - left side) */
.education-card::before {
  content: '';
  position: absolute;
  left: -11px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-background);
  box-shadow: var(--glow-primary);
  z-index: 1;
}

/* Timeline connector dot */
.education-card::after {
  content: '';
  position: absolute;
  left: -5px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.education-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

/* Education Card Icon */
.education-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  color: white;
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}

.education-card__icon svg {
  width: 24px;
  height: 24px;
}

/* Education Card Header */
.education-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

/* Duration Badge */
.education-card__duration {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  background-color: var(--color-info-light);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.education-card__period {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}

.education-card__school {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-1);
}

.education-card__major {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

/* Achievement List */
.education-card__achievements {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-light);
}

.education-card__achievement {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.education-card__achievement::before {
  content: '✓';
  color: var(--color-success);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

/* Desktop Timeline Adjustments */
@media (min-width: 768px) {
  .education-card {
    padding: var(--space-6);
    padding-top: var(--space-16);
    text-align: center;
  }

  /* Top marker for horizontal timeline */
  .education-card::before {
    left: 50%;
    top: -12px;
    transform: translateX(-50%);
  }

  .education-card::after {
    left: 50%;
    top: -6px;
    transform: translateX(-50%);
  }

  .education-card__icon {
    margin-left: auto;
    margin-right: auto;
  }

  .education-card__header {
    flex-direction: column;
    align-items: center;
  }

  .education-card__achievements {
    text-align: left;
  }
}

/* Contact Availability Indicator */
.contact__availability {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-success-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.contact__availability-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-success);
  position: relative;
}

@keyframes availabilityPulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  }
  50% {
    opacity: 0.8;
    box-shadow: 0 0 0 8px rgba(34, 197, 94, 0);
  }
}

/* Contact Card */
.contact-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: linear-gradient(135deg,
    var(--color-surface) 0%,
    rgba(5, 83, 177, 0.03) 100%);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.contact-card:hover {
  box-shadow: 0 8px 24px rgba(5, 83, 177, 0.1);
  border-color: var(--color-primary);
  background: linear-gradient(135deg,
    var(--color-surface) 0%,
    rgba(5, 83, 177, 0.08) 100%);
}

.contact-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background-color: rgba(5, 83, 177, 0.12);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  transition: all var(--transition-base);
  box-shadow: 0 4px 12px rgba(5, 83, 177, 0.1);
}

.contact-card:hover .contact-card__icon {
  background: var(--gradient-primary);
  color: white;
  transform: scale(1.15);
  box-shadow: 0 8px 24px rgba(5, 83, 177, 0.3);
}

.contact-card__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.contact-card__value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  word-break: break-all;
}

/* Copy Button */
.contact-card__copy {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
  border: none;
}

.contact-card:hover .contact-card__copy {
  opacity: 1;
}

.contact-card__copy:hover {
  background-color: var(--color-primary);
  color: white;
}

.contact-card__copy svg {
  width: 16px;
  height: 16px;
}

/* Copy Tooltip */
.contact-card__tooltip {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: white;
  background-color: var(--color-success);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 10;
}

.contact-card__tooltip.show {
  opacity: 1;
  visibility: visible;
}

.contact-card__tooltip::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--color-success);
}

/* Response Time Hint */
.contact-card__response {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.contact-card__response svg {
  width: 12px;
  height: 12px;
  color: var(--color-warning);
}

/* Contact Card Link (for copy-enabled cards) */
.contact-card__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.contact-card__link:hover {
  color: inherit;
}

/* Timeline Project */
.timeline__project {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background-color: rgba(5, 83, 177, 0.1);
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* ==========================================================================
   ETC SECTION - Certifications & Learning Cards
   ========================================================================== */

/* Keyframe Animations */
@keyframes certificateShine {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}

@keyframes learningPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 var(--color-learning-glow);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 0 8px transparent;
    transform: scale(1.02);
  }
}

@keyframes etcSlideIn {
  from {
    opacity: 0;
    transform: translateX(-16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Base Card Styles */
.etc-card {
  position: relative;
  background-color: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card-rest);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  overflow: hidden;
}

/* Top Accent Bar */
.etc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.etc-card:hover::before {
  transform: scaleX(1);
}

.etc-card:hover {
  box-shadow: var(--shadow-card-hover);
}

/* Certificate Card Modifier (Gold Theme) */
.etc-card--certifications::before {
  background: linear-gradient(135deg, var(--color-certificate-dark), var(--color-certificate), var(--color-certificate-light));
}

.etc-card--certifications:hover {
  border-color: var(--color-certificate);
  box-shadow: var(--shadow-card-hover);
}

/* Learning Card Modifier (Teal Theme) */
.etc-card--learning::before {
  background: linear-gradient(135deg, var(--color-learning-dark), var(--color-learning), var(--color-learning-light));
}

.etc-card--learning:hover {
  border-color: var(--color-learning);
  box-shadow: var(--shadow-card-hover);
}

/* Card Title */
.etc-card__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  color: var(--color-text-primary);
}

.etc-card__title-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.etc-card--certifications .etc-card__title-icon {
  background: linear-gradient(135deg, var(--color-certificate-dark), var(--color-certificate));
  color: white;
  box-shadow: 0 4px 12px var(--color-certificate-glow);
}

.etc-card--learning .etc-card__title-icon {
  background: linear-gradient(135deg, var(--color-learning-dark), var(--color-learning));
  color: white;
  box-shadow: 0 4px 12px var(--color-learning-glow);
}

.etc-card__title-icon svg {
  width: 22px;
  height: 22px;
}

.etc-card__title-text {
  flex: 1;
}

.etc-card__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
}

.etc-card--certifications .etc-card__count {
  background: var(--color-certificate-glow);
  color: var(--color-certificate);
  border: 1px solid color-mix(in srgb, var(--color-certificate) 30%, transparent);
}

.etc-card--learning .etc-card__count {
  background: var(--color-learning-glow);
  color: var(--color-learning);
  border: 1px solid color-mix(in srgb, var(--color-learning) 30%, transparent);
}

/* Card List */
.etc-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.etc-card__list li {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background-color: var(--color-background);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);

}

/* Certificate List Items */
.etc-card--certifications .etc-card__list li:hover {
  background-color: var(--color-certificate-glow);
  border-color: var(--color-certificate);
}

/* Learning List Items */
.etc-card--learning .etc-card__list li:hover {
  background-color: var(--color-learning-glow);
  border-color: var(--color-learning);
}

/* Item Icon - Enhanced Size (56px) */
.etc-card__item-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.etc-card--certifications .etc-card__item-icon {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-certificate) 15%, transparent),
    color-mix(in srgb, var(--color-certificate) 5%, transparent));
  border: 1px solid color-mix(in srgb, var(--color-certificate) 25%, transparent);
  color: var(--color-certificate);
}

.etc-card--certifications .etc-card__list li:hover .etc-card__item-icon {
  background: linear-gradient(135deg, var(--color-certificate-dark), var(--color-certificate));
  border-color: var(--color-certificate);
  color: white;
  transform: scale(1.05) rotate(3deg);
  box-shadow: 0 8px 20px var(--color-certificate-glow);
}

.etc-card--learning .etc-card__item-icon {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-learning) 15%, transparent),
    color-mix(in srgb, var(--color-learning) 5%, transparent));
  border: 1px solid color-mix(in srgb, var(--color-learning) 25%, transparent);
  color: var(--color-learning);
}

.etc-card--learning .etc-card__list li:hover .etc-card__item-icon {
  background: linear-gradient(135deg, var(--color-learning-dark), var(--color-learning));
  border-color: var(--color-learning);
  color: white;
  transform: scale(1.05) rotate(-3deg);
  box-shadow: 0 8px 20px var(--color-learning-glow);
}

.etc-card__item-icon svg {
  width: 26px;
  height: 26px;
}

/* Item Content */
.etc-card__item-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 1;
  min-width: 0;
}

.etc-card__item-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.etc-card__item-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* Verified Badge with Shine Effect */
.etc-card__verified {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-certificate);
  background: linear-gradient(135deg,
    var(--color-certificate-glow),
    color-mix(in srgb, var(--color-certificate) 10%, transparent));
  border: 1px solid color-mix(in srgb, var(--color-certificate) 30%, transparent);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.etc-card__verified::after {
  display: none;
}

.etc-card__verified svg {
  width: 12px;
  height: 12px;
}

/* Meta Information */
.etc-card__item-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.etc-card__item-meta-date {
  font-weight: var(--font-weight-medium);
}

.etc-card__item-meta-divider {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background-color: var(--color-text-muted);
  opacity: 0.5;
}

.etc-card__item-meta-org {
  color: var(--color-text-secondary);
}

/* Dark Mode Enhancements */
[data-theme="dark"] .etc-card {
  background: linear-gradient(145deg,
    var(--color-surface),
    color-mix(in srgb, var(--color-surface-elevated) 50%, var(--color-surface)));
  border-color: var(--color-border);
}

[data-theme="dark"] .etc-card__list li {
  background: color-mix(in srgb, var(--color-surface-elevated) 50%, transparent);
  border-color: var(--color-border);
}

[data-theme="dark"] .etc-card--certifications .etc-card__list li:hover {
  background: color-mix(in srgb, var(--color-certificate) 15%, var(--color-surface-elevated));
}

[data-theme="dark"] .etc-card--learning .etc-card__list li:hover {
  background: color-mix(in srgb, var(--color-learning) 15%, var(--color-surface-elevated));
}

/* Responsive Styles */
@media (max-width: 767px) {
  .etc-card {
    padding: var(--space-6);
  }

  .etc-card__title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-5);
  }

  .etc-card__title-icon {
    width: 36px;
    height: 36px;
  }

  .etc-card__title-icon svg {
    width: 18px;
    height: 18px;
  }

  .etc-card__count {
    min-width: 24px;
    height: 24px;
    font-size: var(--font-size-xs);
  }

  .etc-card__list li {
    padding: var(--space-3);
    gap: var(--space-3);
  }

  .etc-card__item-icon {
    width: 48px;
    height: 48px;
  }

  .etc-card__item-icon svg {
    width: 22px;
    height: 22px;
  }

  .etc-card__item-name {
    font-size: var(--font-size-sm);
  }

  .etc-card__item-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .etc-card__item-meta-divider {
    display: none;
  }
}

@media (max-width: 480px) {
  .etc-card__item-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .etc-card__item-icon {
    width: 44px;
    height: 44px;
  }

  .etc-card__item-icon svg {
    width: 20px;
    height: 20px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .etc-card,
  .etc-card__list li,
  .etc-card__item-icon,
  .etc-card::before {
    transition: none;
    animation: none;
  }

  .etc-card__verified::after {
    animation: none;
  }

  .etc-card__list li {
    animation: none;
  }
}

/* Scroll Progress Indicator */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: transparent;
  z-index: calc(var(--z-header) + 1);
}

.scroll-progress__bar {
  height: 100%;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 50ms linear;
}

/* ================================
   Hero Tagline
   ================================ */

.hero__tagline {
  font-size: clamp(1.04rem, 1.8vw, 1.28rem);
  font-weight: var(--font-weight-semibold);
  line-height: 1.55;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.72) 0%,
    rgba(243, 247, 252, 0.92) 100%
  );
  border-radius: var(--radius-lg);
  border: 1px solid rgba(5, 83, 177, 0.16);
  box-shadow: 0 10px 24px rgba(5, 83, 177, 0.08);
  display: inline-flex;
  align-items: center;
}

[data-theme="dark"] .hero__tagline {
  background: linear-gradient(
    135deg,
    rgba(26, 34, 46, 0.9) 0%,
    rgba(13, 17, 23, 0.92) 100%
  );
  border-color: rgba(0, 217, 255, 0.24);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.35);
}

.impact__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .impact__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .impact__grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

.impact-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-5);
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.impact-stat:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.impact-stat--highlight {
  background: linear-gradient(135deg,
    rgba(5, 83, 177, 0.05) 0%,
    rgba(0, 217, 255, 0.1) 100%);
  border-color: var(--color-primary);
}

[data-theme="dark"] .impact-stat--highlight {
  background: linear-gradient(135deg,
    rgba(0, 217, 255, 0.1) 0%,
    rgba(5, 83, 177, 0.15) 100%);
}

.impact-stat__number-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
}

.impact-stat__number {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  font-family: var(--font-family-mono);
  line-height: 1;
}

.impact-stat__suffix {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-left: 2px;
}

.impact-stat__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-top: var(--space-2);
}

.impact-stat__context {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Counter animation pulse */
.impact-stat__number.counting {
  animation: counterPulse 0.1s ease;
}

@keyframes counterPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

/* ================================
   Experience Accordion Details
   ================================ */

.timeline__details {
  margin-top: var(--space-4);
  margin-bottom: var(--space-4);
  border-top: 1px dashed var(--color-border);
  padding-top: var(--space-3);
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

/* Mobile: Increase spacing between expand button and tags */
@media (max-width: 640px) {
  .timeline__details {
    margin-bottom: var(--space-6);
  }
}

.timeline__expand-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  min-height: var(--space-10);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background-color: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  align-self: flex-end;
}

.timeline__expand-btn:hover {
  background-color: var(--color-primary);
  color: white;
}

.timeline__expand-icon {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.timeline__expand-btn[aria-expanded="true"] .timeline__expand-icon {
  transform: rotate(180deg);
}

.timeline__detail-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  width: 100%;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.3s ease, margin 0.3s ease;
}

.timeline__details[data-expanded="true"] .timeline__detail-content {
  max-height: 1000px;
  opacity: 1;
  margin-top: var(--space-4);
}

/* Expanded state: increase bottom margin for better spacing with tags */
.timeline__details[data-expanded="true"] {
  margin-bottom: var(--space-6);
}

@media (max-width: 640px) {
  .timeline__details[data-expanded="true"] {
    margin-bottom: var(--space-8);
  }
}

@media (min-width: 768px) {
  .timeline__detail-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

.timeline__detail-section {
  background-color: var(--color-background);
  padding: var(--space-4);
  border-radius: var(--radius-md);
}

.timeline__detail-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.timeline__achievement-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.timeline__achievement-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.timeline__achievement-metric {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  background-color: rgba(5, 83, 177, 0.1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  flex-shrink: 0;
}

[data-theme="dark"] .timeline__achievement-metric {
  background-color: rgba(0, 217, 255, 0.15);
}

.timeline__achievement-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.timeline__tech-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.timeline__tech-list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding-left: var(--space-4);
  position: relative;
}

.timeline__tech-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* ================================
   Project Modal
   ================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0);
  backdrop-filter: blur(0px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease,
              visibility 0.3s ease,
              background-color 0.3s ease,
              backdrop-filter 0.3s ease;
}

.modal-overlay[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
  background:
    radial-gradient(1200px circle at 20% 0%, rgba(5, 83, 177, 0.26), transparent 60%),
    radial-gradient(900px circle at 90% 20%, rgba(0, 217, 255, 0.2), transparent 55%),
    rgba(6, 10, 18, 0.6);
  backdrop-filter: blur(10px);
}

.modal {
  position: relative;
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(5, 83, 177, 0.18) 0%, transparent 55%),
    radial-gradient(120% 140% at 100% 0%, rgba(0, 217, 255, 0.18) 0%, transparent 50%),
    linear-gradient(180deg, var(--color-surface) 0%, var(--color-background) 100%);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(5, 83, 177, 0.18);
  box-shadow: 0 30px 80px rgba(5, 83, 177, 0.22), 0 10px 30px rgba(15, 23, 42, 0.18);
  overflow: hidden;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.modal-overlay[aria-hidden="false"] .modal {
  transform: translateY(0) scale(1);
}

.modal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0.9;
}

.modal__header {
  position: relative;
  padding: var(--space-5) var(--space-6) var(--space-4);
  background: linear-gradient(
    135deg,
    rgba(5, 83, 177, 0.2) 0%,
    rgba(0, 217, 255, 0.22) 100%
  );
  color: var(--color-text-primary);
  border-bottom: 1px solid rgba(5, 83, 177, 0.18);
  box-shadow: inset 0 -1px 0 rgba(5, 83, 177, 0.2);
}

.modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
  border: 1px solid rgba(5, 83, 177, 0.18);
  box-shadow: 0 8px 18px rgba(5, 83, 177, 0.18);
  backdrop-filter: blur(6px);
}

.modal__close:hover {
  background-color: rgba(5, 83, 177, 0.22);
  transform: rotate(90deg);
}

.modal__close svg {
  width: 20px;
  height: 20px;
}

.modal__badges {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.modal__status {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  padding: var(--space-1) var(--space-2);
  background-color: rgba(5, 83, 177, 0.12);
  color: var(--color-primary);
  border: 1px solid rgba(5, 83, 177, 0.2);
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.modal__category {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-2);
  background-color: rgba(0, 217, 255, 0.12);
  color: var(--color-text-secondary);
  border: 1px solid rgba(0, 217, 255, 0.2);
  border-radius: var(--radius-full);
}

.modal__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-1-5);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.modal__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.modal__body {
  padding: var(--space-5) var(--space-6) var(--space-6);
  max-height: calc(90vh - 190px);
  overflow-y: auto;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.modal__body::-webkit-scrollbar {
  width: 6px;
}

.modal__body::-webkit-scrollbar-track {
  background: var(--color-border-light);
  border-radius: 3px;
}

.modal__body::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 3px;
}

.modal__section {
  margin-bottom: 0;
  padding: var(--space-4);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(245, 248, 255, 0.95) 100%);
  border: 1px solid rgba(5, 83, 177, 0.12);
  border-left: 3px solid rgba(5, 83, 177, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 26px rgba(5, 83, 177, 0.08), 0 4px 10px rgba(15, 23, 42, 0.08);
}

.modal__section:last-child {
  margin-bottom: 0;
}

.modal__section-title {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.2px;
  margin-bottom: var(--space-2-5);
}

.modal__section-title::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  box-shadow: var(--glow-primary);
}

.modal__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.modal__feature-list,
.modal__achievement-list,
.modal__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.modal__feature-list li,
.modal__achievement-list li,
.modal__features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(5, 83, 177, 0.12);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  box-shadow: 0 6px 14px rgba(5, 83, 177, 0.08);
}

.modal__feature-list li::before,
.modal__achievement-list li::before,
.modal__features li::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  box-shadow: 0 0 10px rgba(5, 83, 177, 0.3);
  margin-top: var(--space-1-5);
  flex-shrink: 0;
}

.modal__challenge,
.modal__solution {
  padding: var(--space-3);
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(5, 83, 177, 0.12);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  box-shadow: 0 6px 14px rgba(5, 83, 177, 0.08);
}

.modal__challenge {
  border-left: 3px solid var(--color-warning);
  background: linear-gradient(180deg, rgba(251, 191, 36, 0.12) 0%, rgba(255, 255, 255, 0.95) 100%);
  margin-bottom: var(--space-3);
}

.modal__solution {
  border-left: 3px solid var(--color-success);
  background: linear-gradient(180deg, rgba(34, 197, 94, 0.12) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.modal__tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.modal__tech-item,
.modal__tech-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: linear-gradient(180deg, rgba(5, 83, 177, 0.08) 0%, rgba(255, 255, 255, 0.95) 100%);
  border: 1px solid rgba(5, 83, 177, 0.18);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  box-shadow: 0 6px 12px rgba(5, 83, 177, 0.08);
}

.modal__challenges {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.modal__challenge-card {
  background-color: var(--color-background);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.modal__challenge-problem,
.modal__challenge-solution {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--font-size-sm);
}

.modal__challenge-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.modal__challenge-icon--problem {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

.modal__challenge-icon--solution {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6) var(--space-5);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}

.modal__footer:empty {
  display: none;
}

[data-theme="dark"] .modal {
  background: var(--modal-bg);
  background-image: none;
  border-color: var(--modal-border-strong);
  box-shadow: var(--shadow-xl);
}

[data-theme="dark"] .modal__header {
  background: var(--modal-panel);
  background-image: none;
  border-bottom-color: var(--modal-border-strong);
  box-shadow: none;
  color: var(--modal-text-high);
}

[data-theme="dark"] .modal__body {
  background: var(--modal-bg);
  color: var(--modal-text-high);
}

[data-theme="dark"] .modal__title {
  color: var(--modal-text-high);
}

[data-theme="dark"] .modal__subtitle {
  color: var(--modal-text-muted);
}

[data-theme="dark"] .modal__section {
  background: var(--modal-panel);
  background-image: none;
  border-color: var(--modal-border-strong);
  border-left-color: var(--modal-chip-border);
  box-shadow: none;
}

[data-theme="dark"] .modal__section-title {
  color: var(--modal-accent);
}

[data-theme="dark"] .modal__section-title::before {
  background: var(--modal-accent);
  box-shadow: none;
}

[data-theme="dark"] .modal__description {
  color: var(--modal-text-body);
}

[data-theme="dark"] .modal__feature-list li,
[data-theme="dark"] .modal__achievement-list li,
[data-theme="dark"] .modal__features li {
  background: var(--modal-panel-soft);
  border-color: var(--modal-border-strong);
  color: var(--modal-text-body);
  box-shadow: none;
}

[data-theme="dark"] .modal__feature-list li::before,
[data-theme="dark"] .modal__achievement-list li::before,
[data-theme="dark"] .modal__features li::before {
  background: var(--modal-accent);
  box-shadow: none;
}

[data-theme="dark"] .modal__challenge {
  background: var(--modal-warning-surface);
  background-image: none;
  border: 1px solid var(--modal-warning-border);
  border-left: 3px solid var(--modal-warning-border);
  color: var(--modal-text-body);
  box-shadow: none;
}

[data-theme="dark"] .modal__solution {
  background: var(--modal-success-surface);
  background-image: none;
  border: 1px solid var(--modal-success-border);
  border-left: 3px solid var(--modal-success-border);
  color: var(--modal-text-body);
  box-shadow: none;
}

[data-theme="dark"] .modal__tech-item,
[data-theme="dark"] .modal__tech-tag {
  background: var(--modal-chip-surface);
  background-image: none;
  border-color: var(--modal-chip-border);
  color: var(--modal-text-high);
  box-shadow: none;
}

[data-theme="dark"] .modal__footer {
  background: var(--modal-panel);
  border-top-color: var(--modal-border-strong);
}

[data-theme="dark"] .modal__close {
  background: var(--modal-panel-soft);
  border-color: var(--modal-border-strong);
  color: var(--modal-text-high);
  box-shadow: none;
  backdrop-filter: none;
}

[data-theme="dark"] .modal__close:hover {
  background: var(--modal-chip-surface);
  color: var(--modal-text-high);
}

/* Mobile: Bottom Sheet Modal */
@media (max-width: 640px) {
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }

  .modal {
    max-height: 95vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transform: translateY(100%);
  }

  .modal-overlay[aria-hidden="false"] .modal {
    transform: translateY(0);
  }

  .modal__header {
    padding: var(--space-4) var(--space-5) var(--space-3);
  }

  .modal__body {
    padding: var(--space-4) var(--space-5) var(--space-5);
  }

  .modal__section {
    padding: var(--space-3);
  }

  .modal__footer {
    padding: var(--space-3) var(--space-5) var(--space-4);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .modal-overlay,
  .modal,
  .timeline__detail-content,
  .timeline__expand-icon,
  .impact-stat {
    transition: none !important;
  }

  .impact-stat__number.counting {
    animation: none;
  }
}