/* ==========================================================================
   DR. BROOKS SERVICES — GLASSMORPHISM THEME SYSTEM
   Dark Mode: White Glassmorphism | Light Mode: Black Glassmorphism
   ========================================================================== */

/* --- 1. Design Tokens & Color Palette --- */
:root {
  /* Typography Stack: English -> Inter, Korean -> Noto Sans KR */
  --font-system: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Noto Sans KR', ui-monospace, Menlo, Consolas, monospace;

  /* Squircles & Radius */
  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Apple Spring Motion Timings */
  --spring-instant: 100ms cubic-bezier(0, 0, 0.2, 1);
  --spring-snappy: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --spring-gentle: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
  --spring-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Light Theme (Black Glassmorphism Cards on Light Background) */
  --bg-body: #f2f4f8;
  --bg-card: rgba(18, 20, 30, 0.84);
  --bg-card-hover: rgba(28, 30, 44, 0.94);
  --bg-chrome: rgba(242, 244, 248, 0.82);
  --bg-elevated: rgba(0, 0, 0, 0.05);
  --bg-subtle: rgba(0, 0, 0, 0.03);
  --bg-pill: rgba(0, 0, 0, 0.06);

  --border-glass: rgba(0, 0, 0, 0.2);
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-divider: rgba(0, 0, 0, 0.07);

  --text-primary: #000000;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --text-faint: #cbd5e1;

  /* Card Internal Colors (Black Glass) */
  --card-text-title: #ffffff;
  --card-text-desc: rgba(255, 255, 255, 0.88);
  --card-text-muted: rgba(255, 255, 255, 0.65);
  --card-bg-subtle: rgba(0, 0, 0, 0.28);
  --card-border-subtle: rgba(255, 255, 255, 0.12);
  --card-bg-pill: rgba(255, 255, 255, 0.12);
  --card-btn-detail: rgba(255, 255, 255, 0.14);

  /* Apple Accent Colors */
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-teal: #2997ff;
  --apple-green: #34c759;
  --apple-amber: #ff9500;
  --apple-purple: #af52de;
  --apple-rose: #ff2d55;

  --shadow-ambient: 0 4px 14px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 16px 36px -8px rgba(15, 23, 42, 0.26), 0 0 1px 1px rgba(0, 0, 0, 0.12);
  --shadow-card-hover: 0 24px 50px -10px rgba(15, 23, 42, 0.4), 0 0 1px 1px rgba(255, 255, 255, 0.2);
  --shadow-modal: 0 35px 80px -15px rgba(0, 0, 0, 0.4), 0 0 1px 1px rgba(255, 255, 255, 0.12);

  --timeline-line: rgba(0, 0, 0, 0.12);
  --timeline-node-bg: #181924;
}

/* Dark Theme (White Glassmorphism Cards on Dark Background) */
[data-theme="dark"] {
  --bg-body: #060911;
  --bg-card: rgba(255, 255, 255, 0.10);
  --bg-card-hover: rgba(255, 255, 255, 0.17);
  --bg-chrome: rgba(10, 14, 26, 0.80);
  --bg-elevated: rgba(255, 255, 255, 0.09);
  --bg-subtle: rgba(255, 255, 255, 0.05);
  --bg-pill: rgba(255, 255, 255, 0.09);

  --border-glass: rgba(255, 255, 255, 0.24);
  --border-subtle: rgba(255, 255, 255, 0.14);
  --border-divider: rgba(255, 255, 255, 0.10);

  --text-primary: #ffffff;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-faint: #475569;

  /* Card Internal Colors (White Glass) */
  --card-text-title: #ffffff;
  --card-text-desc: rgba(255, 255, 255, 0.92);
  --card-text-muted: rgba(255, 255, 255, 0.72);
  --card-bg-subtle: rgba(255, 255, 255, 0.08);
  --card-border-subtle: rgba(255, 255, 255, 0.18);
  --card-bg-pill: rgba(255, 255, 255, 0.16);
  --card-btn-detail: rgba(255, 255, 255, 0.16);

  --apple-blue: #2997ff;
  --apple-blue-hover: #40a9ff;

  --shadow-ambient: 0 4px 20px rgba(0, 0, 0, 0.6);
  --shadow-card: 0 18px 45px -8px rgba(0, 0, 0, 0.65), inset 0 1px 1px rgba(255, 255, 255, 0.35);
  --shadow-card-hover: 0 26px 60px -10px rgba(0, 0, 0, 0.8), inset 0 1px 1px rgba(255, 255, 255, 0.5);
  --shadow-modal: 0 45px 100px -15px rgba(0, 0, 0, 0.9), inset 0 1px 1px rgba(255, 255, 255, 0.4);

  --timeline-line: rgba(255, 255, 255, 0.16);
  --timeline-node-bg: #0f172a;
}

/* --- 2. Base & Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-system);
  background-color: var(--bg-body);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
  letter-spacing: -0.005em;
  transition: background-color var(--spring-snappy), color var(--spring-snappy);
}

a {
  color: inherit;
  text-decoration: none;
}

button, input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  color: inherit;
}

button {
  cursor: pointer;
  user-select: none;
}

/* Instant Tactile Feedback on Pointer Press (§1) */
button:active, .filter-tab:active, .btn-card-launch:active, .btn-card-detail:active {
  transform: scale(0.96) !important;
  transition: transform var(--spring-instant) !important;
}

/* --- 3. Subtle Ambient Light Fields --- */
.ambient-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.glow-sphere {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.18;
  transition: opacity var(--spring-snappy);
}

[data-theme="dark"] .glow-sphere {
  opacity: 0.28;
}

.sphere-1 {
  width: 680px;
  height: 680px;
  top: -180px;
  left: 15%;
  background: radial-gradient(circle, #2997ff 0%, rgba(41, 151, 255, 0) 70%);
}

.sphere-2 {
  width: 520px;
  height: 520px;
  top: 35%;
  right: -120px;
  background: radial-gradient(circle, #af52de 0%, rgba(175, 82, 222, 0) 70%);
}

.sphere-3 {
  width: 750px;
  height: 750px;
  bottom: -220px;
  left: 20%;
  background: radial-gradient(circle, #30d158 0%, rgba(48, 209, 88, 0) 70%);
}

/* --- 4. Main App Layout --- */
.app-layout {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- 5. Translucent Header Bar (§12) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-chrome);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border-bottom: 1px solid var(--border-divider);
  transition: background-color var(--spring-snappy), border-color var(--spring-snappy);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #0071e3 0%, #af52de 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 18px;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.28);
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.022em;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-title span {
  font-weight: 400;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--spring-snappy);
}

.btn-theme-toggle:hover {
  background: var(--bg-card);
  border-color: var(--border-glass);
}

[data-theme="dark"] .icon-light { display: block; }
[data-theme="dark"] .icon-dark { display: none; }
[data-theme="light"] .icon-light { display: none; }
[data-theme="light"] .icon-dark { display: block; }

/* --- 6. Hero Section (Central Title in Solid Black on Light, White on Dark) --- */
.hero-section {
  padding: 72px 24px 44px;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 750;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.5;
  letter-spacing: -0.012em;
}

/* --- 7. Control & Segmented Filter Bar (§12) --- */
.control-section {
  position: sticky;
  top: 67px;
  z-index: 40;
  background: var(--bg-chrome);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border-top: 1px solid var(--border-divider);
  border-bottom: 1px solid var(--border-divider);
  padding: 10px 28px;
}

.control-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.filter-tabs-scroll {
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  flex: 1;
}

.filter-tabs-scroll::-webkit-scrollbar {
  display: none;
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.filter-tab {
  padding: 7px 15px;
  border-radius: var(--radius-full);
  background: var(--bg-pill);
  border: 1px solid transparent;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.01em;
  transition: all var(--spring-snappy);
}

.filter-tab:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.filter-tab.active {
  background: var(--apple-blue);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 2px 10px rgba(0, 113, 227, 0.35);
}

/* Apple-style Segmented View Control */
.view-toggle-group {
  display: flex;
  align-items: center;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 3px;
  flex-shrink: 0;
}

.btn-view-toggle {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--spring-snappy);
}

.btn-view-toggle.active {
  background: var(--bg-body);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* --- 8. Results Counter --- */
.results-bar-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 28px 6px;
  width: 100%;
}

.results-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.results-count span {
  font-weight: 600;
  color: var(--text-primary);
}

.btn-reset-filters {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--apple-blue);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  transition: all var(--spring-snappy);
}

.btn-reset-filters:hover {
  background: var(--border-subtle);
}

/* --- 9. Main Showcase Container --- */
.main-showcase-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 28px 90px;
  width: 100%;
  flex: 1;
}

.timeline-section, .grid-section {
  display: none;
}

.timeline-section.active, .grid-section.active {
  display: block;
}

/* ==========================================================================
   10. TIMELINE VIEW (Fluid Apple Stream)
   ========================================================================== */
.timeline-section {
  position: relative;
  padding: 16px 0 40px;
}

.timeline-track {
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--timeline-line);
  border-radius: 1px;
}

@media (min-width: 900px) {
  .timeline-track {
    left: 50%;
    transform: translateX(-50%);
  }
}

.timeline-items {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
}

.timeline-item {
  position: relative;
  display: flex;
  flex-direction: column;
  padding-left: 64px;
}

@media (min-width: 900px) {
  .timeline-item {
    width: 50%;
    padding-left: 0;
  }

  .timeline-item:nth-child(odd) {
    align-self: flex-start;
    padding-right: 44px;
  }

  .timeline-item:nth-child(even) {
    align-self: flex-end;
    padding-left: 44px;
  }
}

/* Apple Timeline Glass Capsule Node */
.timeline-node {
  position: absolute;
  left: 12px;
  top: 24px;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: var(--timeline-node-bg);
  border: 2px solid var(--apple-blue);
  box-shadow: 0 0 0 5px var(--bg-body), 0 4px 12px rgba(0, 113, 227, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--apple-blue);
  z-index: 10;
  transition: all var(--spring-snappy);
}

@media (min-width: 900px) {
  .timeline-item:nth-child(odd) .timeline-node {
    left: auto;
    right: -17px;
  }

  .timeline-item:nth-child(even) .timeline-node {
    left: -17px;
  }
}

.timeline-item:hover .timeline-node {
  background: var(--apple-blue);
  color: #ffffff;
  transform: scale(1.14);
}

/* ==========================================================================
   11. GLASSMORPHISM CARDS (Dark: White Glass | Light: Black Glass)
   ========================================================================== */
.showcase-card {
  background: var(--bg-card);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--spring-snappy), box-shadow var(--spring-snappy), background var(--spring-snappy), border-color var(--spring-snappy);
}

/* Hover & Selected State: Whole card smoothly becomes the service gradient */
.showcase-card:hover,
.showcase-card.is-selected {
  transform: translateY(-5px) scale(1.01);
  background: var(--card-gradient, linear-gradient(135deg, #0071e3, #af52de)) !important;
  box-shadow: var(--shadow-card-hover), 0 14px 34px rgba(0, 0, 0, 0.35);
  border-color: rgba(255, 255, 255, 0.45);
}

/* On hover/selected: adjust internal typography & badges for clean legibility */
.showcase-card:hover .card-title,
.showcase-card.is-selected .card-title {
  color: #ffffff !important;
}

.showcase-card:hover .card-tagline,
.showcase-card.is-selected .card-tagline,
.showcase-card:hover .card-desc,
.showcase-card.is-selected .card-desc {
  color: rgba(255, 255, 255, 0.94);
}

.showcase-card:hover .card-seq-badge,
.showcase-card.is-selected .card-seq-badge {
  color: rgba(255, 255, 255, 0.88);
}

.showcase-card:hover .card-cat-badge,
.showcase-card.is-selected .card-cat-badge {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.35);
  color: #ffffff;
}

.showcase-card:hover .card-highlights,
.showcase-card.is-selected .card-highlights {
  background: rgba(0, 0, 0, 0.18);
  border-color: rgba(255, 255, 255, 0.2);
}

.showcase-card:hover .card-highlights li,
.showcase-card.is-selected .card-highlights li {
  color: rgba(255, 255, 255, 0.95);
}

.showcase-card:hover .card-highlights li i,
.showcase-card.is-selected .card-highlights li i {
  color: #ffffff;
}

.showcase-card:hover .tech-badge,
.showcase-card.is-selected .tech-badge {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
  color: #ffffff;
}

.showcase-card:hover .card-footer,
.showcase-card.is-selected .card-footer {
  border-top-color: rgba(255, 255, 255, 0.2);
}

.showcase-card:hover .btn-card-launch,
.showcase-card.is-selected .btn-card-launch {
  background: #ffffff;
  color: #1d1d1f;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.showcase-card:hover .btn-card-detail,
.showcase-card.is-selected .btn-card-detail {
  background: rgba(255, 255, 255, 0.24);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
}

/* Card Header */
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.card-identity {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Apple Squircle Icon Box */
.card-icon-box {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  color: #ffffff;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transition: transform var(--spring-snappy);
}

.showcase-card:hover .card-icon-box,
.showcase-card.is-selected .card-icon-box {
  transform: scale(1.08);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.card-title-meta {
  display: flex;
  flex-direction: column;
}

.card-seq-badge {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--apple-blue);
  letter-spacing: -0.01em;
  transition: color var(--spring-snappy);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--card-text-title);
  line-height: 1.25;
  transition: color var(--spring-snappy);
}

.card-tagline {
  font-size: 0.85rem;
  color: var(--card-text-muted);
  font-weight: 400;
  letter-spacing: -0.008em;
}

.card-cat-badge {
  font-family: var(--font-mono);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--card-bg-pill);
  border: 1px solid var(--card-border-subtle);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--card-text-title);
  white-space: nowrap;
}

/* Card Body */
.card-desc {
  font-size: 0.92rem;
  color: var(--card-text-desc);
  line-height: 1.55;
  letter-spacing: -0.01em;
}

.card-highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--card-bg-subtle);
  border: 1px solid var(--card-border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.card-highlights li {
  font-size: 0.82rem;
  color: var(--card-text-desc);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.008em;
}

.card-highlights li i {
  color: var(--apple-green);
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* Tech Badges */
.card-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-badge {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 3px 9px;
  border-radius: var(--radius-xs);
  background: var(--card-bg-pill);
  border: 1px solid var(--card-border-subtle);
  color: var(--card-text-desc);
  letter-spacing: -0.005em;
}

/* Card Footer Actions */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--card-border-subtle);
}

.btn-card-launch {
  flex: 1;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--apple-blue);
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  letter-spacing: -0.01em;
  box-shadow: 0 2px 8px rgba(0, 113, 227, 0.28);
  transition: all var(--spring-snappy);
}

.btn-card-launch:hover {
  background: var(--apple-blue-hover);
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.45);
}

.btn-card-detail {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--card-btn-detail);
  border: 1px solid var(--card-border-subtle);
  color: var(--card-text-title);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: all var(--spring-snappy);
}

.btn-card-detail:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   12. GRID VIEW (Apple Modern 3-Column Layout)
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ==========================================================================
   13. EMPTY STATE
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(28px);
  border: 1px dashed var(--border-glass);
  border-radius: var(--radius-lg);
  max-width: 480px;
  margin: 40px auto;
}

.empty-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--card-bg-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--card-text-muted);
  margin: 0 auto 18px;
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--card-text-title);
  margin-bottom: 6px;
}

.empty-state p {
  color: var(--card-text-muted);
  font-size: 0.9rem;
  margin-bottom: 22px;
}

/* ==========================================================================
   14. APPLE DETAIL SHEET / MODAL (§3, §12)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 1;
  transition: opacity var(--spring-snappy);
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
}

.modal-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(34px) saturate(200%);
  -webkit-backdrop-filter: blur(34px) saturate(200%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-modal);
  display: flex;
  flex-direction: column;
  z-index: 10;
  transform: scale(1) translateY(0);
  transition: transform var(--spring-gentle), opacity var(--spring-snappy);
}

.modal-overlay.hidden .modal-card {
  transform: scale(0.95) translateY(12px);
}

.modal-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--card-border-subtle);
}

.modal-category-badge {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--apple-blue);
  background: var(--card-bg-pill);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: -0.01em;
}

.modal-close-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--card-bg-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--card-text-title);
  transition: all var(--spring-snappy);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.28);
}

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-hero-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.modal-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0071e3 0%, #af52de 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 22px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
}

.modal-titles {
  display: flex;
  flex-direction: column;
}

.modal-title {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--card-text-title);
  line-height: 1.2;
}

.modal-tagline {
  font-size: 0.88rem;
  color: var(--card-text-muted);
  font-weight: 400;
}

.modal-description {
  font-size: 0.94rem;
  color: var(--card-text-desc);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

.modal-section-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--card-text-title);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-section-title i {
  color: var(--apple-blue);
}

.modal-highlights-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--card-bg-subtle);
  border: 1px solid var(--card-border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}

.modal-highlights-list li {
  font-size: 0.88rem;
  color: var(--card-text-desc);
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-highlights-list li i {
  color: var(--apple-green);
}

.modal-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.modal-meta-grid {
  display: grid;
  grid-template-columns: 1fr;
  padding-top: 4px;
}

.modal-meta-item {
  background: var(--card-bg-subtle);
  border: 1px solid var(--card-border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.meta-lbl {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--card-text-muted);
}

.meta-val {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--card-text-title);
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--card-border-subtle);
  background: var(--card-bg-subtle);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.btn {
  height: 40px;
  padding: 0 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  letter-spacing: -0.01em;
  transition: all var(--spring-snappy);
}

.btn-primary {
  background: var(--apple-blue);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 113, 227, 0.32);
}

.btn-primary:hover {
  background: var(--apple-blue-hover);
}

.btn-secondary {
  background: var(--card-bg-pill);
  border: 1px solid var(--card-border-subtle);
  color: var(--card-text-title);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.28);
}

/* ==========================================================================
   15. APPLE DYNAMIC ISLAND STYLE TOAST NOTIFICATION
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: rgba(20, 22, 34, 0.88);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-full);
  padding: 10px 22px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  font-weight: 600;
  color: #ffffff;
  pointer-events: auto;
  animation: appleToastEnter 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast i {
  color: var(--apple-green);
}

@keyframes appleToastEnter {
  from { transform: translateY(100%) scale(0.9); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

/* ==========================================================================
   16. SITE FOOTER
   ========================================================================== */
.site-footer {
  background: var(--bg-chrome);
  border-top: 1px solid var(--border-divider);
  padding: 36px 28px 28px;
  margin-top: auto;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.footer-logo i {
  color: var(--apple-blue);
}

.footer-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.5;
}

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.btn-back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--apple-blue);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  transition: all var(--spring-snappy);
}

.btn-back-to-top:hover {
  background: var(--bg-card);
}

/* ==========================================================================
   17. REDUCED MOTION & ACCESSIBILITY (§14)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .showcase-card:hover {
    transform: none !important;
  }
  .modal-card {
    transform: none !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header, .control-section, .showcase-card, .modal-backdrop, .modal-card, .toast {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background-color: var(--bg-body) !important;
  }
}

.hidden {
  display: none !important;
}