/* ==========================================================================
   ARIET // ACADEMIC & ENGINEERING ADMISSIONS PORTFOLIO
   Design Language: Apple Design System (Cupertino Aesthetic)
   Principles: Human-centric, quiet luxury, typography-driven, pristine clarity
   ========================================================================== */

:root {
  /* Apple Palette - Pristine Light (Default) */
  --bg-canvas: #F5F5F7;
  --bg-canvas-subtle: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FAFAFC;
  --bg-card-subtle: #F0F0F2;
  
  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-medium: rgba(0, 0, 0, 0.12);
  --border-prominent: rgba(0, 0, 0, 0.2);
  
  --text-primary: #1D1D1F;
  --text-secondary: #515154;
  --text-tertiary: #86868B;
  --text-quaternary: #A1A1A6;
  
  /* Apple Signature Accent Colors */
  --apple-blue: #0071E3;
  --apple-blue-hover: #0077ED;
  --apple-blue-subtle: rgba(0, 113, 227, 0.08);
  --apple-teal: #2997FF;
  --apple-green: #34C759;
  --apple-green-subtle: rgba(52, 199, 89, 0.1);
  --apple-purple: #AF52DE;
  --apple-purple-subtle: rgba(175, 82, 222, 0.08);
  --apple-indigo: #5856D6;
  
  /* Typography - San Francisco Hierarchy */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Inter", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Monaco, Consolas, monospace;
  
  /* Geometry & Curves */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 9999px;
  
  /* Elevation & Shadows */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.03);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
  --shadow-card-hover: 0 12px 36px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.03);
  --shadow-nav: 0 4px 24px rgba(0, 0, 0, 0.06);
  
  --max-width: 1180px;
}

/* Apple Dark Mode (macOS Sonoma / Sequoia aesthetic) */
[data-theme="dark"] {
  --bg-canvas: #000000;
  --bg-canvas-subtle: #121214;
  --bg-card: #1C1C1E;
  --bg-card-hover: #242426;
  --bg-card-subtle: #2C2C2E;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-prominent: rgba(255, 255, 255, 0.28);
  
  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A6;
  --text-tertiary: #6E6E73;
  --text-quaternary: #48484A;
  
  --apple-blue: #2997FF;
  --apple-blue-hover: #0077ED;
  --apple-blue-subtle: rgba(41, 151, 255, 0.15);
  --apple-green: #30D158;
  --apple-green-subtle: rgba(48, 209, 88, 0.15);
  --apple-purple: #BF5AF2;
  --apple-purple-subtle: rgba(191, 90, 242, 0.15);
  
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-nav: 0 4px 24px rgba(0, 0, 0, 0.7);
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}

.mono {
  font-family: var(--font-mono);
}

/* ==========================================================================
   NAVIGATION BAR & LIQUID GLASS LANGUAGE SELECTOR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 16px;
  z-index: 1000;
  margin-bottom: 40px;
}

.nav-blur-shell {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(190%) blur(24px);
  -webkit-backdrop-filter: saturate(190%) blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: nowrap;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05), inset 0 1px 1.5px rgba(255, 255, 255, 0.85);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

[data-theme="dark"] .nav-blur-shell {
  background: rgba(28, 28, 30, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.14);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
  user-select: none;
}

.brand-initial {
  width: 32px;
  height: 32px;
  background: var(--text-primary);
  color: var(--bg-canvas);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: -0.02em;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  flex-shrink: 0;
}

.brand-meta-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: -0.01em;
}

.brand-badge {
  font-size: 10.5px;
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-shrink: 1;
}

.nav-item-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  display: inline-block;
}

.nav-item-link:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .nav-item-link:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* ==========================================================================
   AUTHENTIC APPLE LIQUID GLASS LANGUAGE SELECTOR
   ========================================================================== */
.lang-segmented-control {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 3px;
  gap: 2px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.42);
  backdrop-filter: blur(24px) saturate(200%);
  -webkit-backdrop-filter: blur(24px) saturate(200%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: 
    0 4px 14px rgba(0, 0, 0, 0.04), 
    inset 0 1px 1.5px rgba(255, 255, 255, 1), 
    inset 0 -1px 1px rgba(0, 0, 0, 0.03);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
  overflow: hidden;
}

[data-theme="dark"] .lang-segmented-control {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 
    0 4px 18px rgba(0, 0, 0, 0.3), 
    inset 0 1px 1px rgba(255, 255, 255, 0.18), 
    inset 0 -1px 1px rgba(0, 0, 0, 0.4);
}

.lang-pill-btn {
  position: relative;
  z-index: 1;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-tertiary);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  outline: none;
}

.lang-pill-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.55);
}

[data-theme="dark"] .lang-pill-btn:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.12);
}

.lang-pill-btn:active {
  transform: scale(0.94);
}

/* Liquid Glass Capsule Active State */
.lang-pill-btn.active {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(246, 246, 248, 0.92) 100%);
  color: #1D1D1F;
  border: 1px solid rgba(255, 255, 255, 0.95);
  box-shadow: 
    0 3px 10px rgba(0, 0, 0, 0.07), 
    0 1px 3px rgba(0, 0, 0, 0.04), 
    inset 0 1px 1.5px rgba(255, 255, 255, 1),
    inset 0 -1px 1px rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .lang-pill-btn.active {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.26) 0%, rgba(255, 255, 255, 0.12) 100%);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 
    0 4px 14px rgba(0, 0, 0, 0.35), 
    inset 0 1px 1.5px rgba(255, 255, 255, 0.35),
    inset 0 -1px 1px rgba(0, 0, 0, 0.2);
}

/* Apple Liquid Glass Icon Buttons */
.btn-apple-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.82);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.65) 0%, rgba(255, 255, 255, 0.35) 100%);
  backdrop-filter: blur(20px) saturate(190%);
  -webkit-backdrop-filter: blur(20px) saturate(190%);
  box-shadow: 
    0 3px 12px rgba(0, 0, 0, 0.05), 
    inset 0 1.5px 1.5px rgba(255, 255, 255, 1),
    inset 0 -1px 1px rgba(0, 0, 0, 0.04);
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

[data-theme="dark"] .btn-apple-icon {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.04) 100%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 
    0 3px 14px rgba(0, 0, 0, 0.35), 
    inset 0 1.5px 1px rgba(255, 255, 255, 0.25),
    inset 0 -1px 1px rgba(0, 0, 0, 0.4);
  color: var(--text-secondary);
}

.btn-apple-icon:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.65) 100%);
  color: var(--text-primary);
  border-color: #FFFFFF;
  transform: translateY(-1px) scale(1.08);
  box-shadow: 
    0 8px 22px rgba(0, 0, 0, 0.08), 
    inset 0 2px 2px #FFFFFF;
}

[data-theme="dark"] .btn-apple-icon:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.22) 0%, rgba(255, 255, 255, 0.09) 100%);
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.32);
  transform: translateY(-1px) scale(1.08);
  box-shadow: 
    0 8px 24px rgba(0, 0, 0, 0.5), 
    inset 0 2px 2px rgba(255, 255, 255, 0.4);
}

.btn-apple-icon:active {
  transform: scale(0.92);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
  transition-duration: 0.1s;
}

/* Mobile Menu Toggle button (hidden on desktop) */
.btn-menu-toggle {
  display: none;
}

/* Mobile Drawer (iOS Liquid Glass Sheet) */
.mobile-nav-drawer {
  position: absolute;
  top: calc(100% + 10px);
  left: 28px;
  right: 28px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(190%) blur(30px);
  -webkit-backdrop-filter: saturate(190%) blur(30px);
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 20px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.12), inset 0 1px 1px rgba(255, 255, 255, 0.9);
  padding: 10px;
  display: none;
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 999;
}

[data-theme="dark"] .mobile-nav-drawer {
  background: rgba(28, 28, 30, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.6), inset 0 1px 1px rgba(255, 255, 255, 0.15);
}

.mobile-nav-drawer.active {
  display: block;
  opacity: 1;
  transform: translateY(0) scale(1);
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-link {
  display: block;
  padding: 12px 16px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 12px;
  transition: all 0.15s ease;
}

.mobile-nav-link:hover, .mobile-nav-link:active {
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .mobile-nav-link:hover, [data-theme="dark"] .mobile-nav-link:active {
  background: rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   HERO SECTION (Apple Keynote Style)
   ========================================================================== */
.hero-wrapper {
  padding: 40px 0 64px;
  text-align: center;
}

.admissions-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--apple-blue-subtle);
  color: var(--apple-blue);
  border: 1px solid rgba(0, 113, 227, 0.16);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}

.hero-headline {
  font-size: clamp(38px, 6vw, 68px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  max-width: 960px;
  margin: 0 auto 20px;
}

.hero-headline span.gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 20%, var(--text-tertiary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subhead {
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 740px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

/* ==========================================================================
   AUTHENTIC APPLE LIQUID GLASS BUTTON SYSTEM
   ========================================================================== */
.btn-apple-primary,
.btn-apple-secondary,
.btn-demo-run,
.btn-demo-tilt,
.contact-pill-btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  outline: none;
}

/* Ensure text, inner labels, and icons sit cleanly above dynamic liquid caustics */
.btn-apple-primary > *,
.btn-apple-secondary > *,
.btn-demo-run > *,
.btn-demo-tilt > *,
.contact-pill-btn > * {
  position: relative;
  z-index: 2;
  pointer-events: none;
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Internal Dynamic Interactive Liquid Glare (Cursor-following Spotlight) */
.btn-apple-primary::before,
.btn-apple-secondary::before,
.btn-apple-icon::before,
.btn-demo-run::before,
.btn-demo-tilt::before,
.contact-pill-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(
    130px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(255, 255, 255, 0.45) 0%,
    rgba(255, 255, 255, 0.12) 40%,
    transparent 72%
  );
  opacity: var(--glare-opacity, 0);
  transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Ambient Flowing Liquid Glass Specular Wave (Perpetual Shimmer) */
.btn-apple-primary::after,
.btn-apple-secondary::after,
.btn-demo-run::after,
.btn-demo-tilt::after,
.contact-pill-btn::after {
  content: "";
  position: absolute;
  top: -70%;
  left: -80%;
  width: 260%;
  height: 240%;
  border-radius: inherit;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    116deg,
    transparent 36%,
    rgba(255, 255, 255, 0.05) 42%,
    rgba(255, 255, 255, 0.28) 48%,
    rgba(255, 255, 255, 0.52) 51%,
    rgba(255, 255, 255, 0.16) 54%,
    transparent 62%
  );
  transform: translateX(-120%) rotate(22deg);
  animation: liquidGlassWave 6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.btn-apple-primary:hover::after,
.btn-apple-secondary:hover::after,
.btn-demo-run:hover::after,
.btn-demo-tilt:hover::after,
.contact-pill-btn:hover::after {
  animation: liquidGlassWaveHover 2.2s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

@keyframes liquidGlassWave {
  0% {
    transform: translateX(-120%) rotate(22deg);
  }
  30%, 100% {
    transform: translateX(120%) rotate(22deg);
  }
}

@keyframes liquidGlassWaveHover {
  0% {
    transform: translateX(-120%) rotate(22deg);
  }
  100% {
    transform: translateX(120%) rotate(22deg);
  }
}

/* Fluid Liquid Ripple Burst on Pointer Click */
.liquid-glass-ripple {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
  width: 28px;
  height: 28px;
  margin-left: -14px;
  margin-top: -14px;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.88) 0%,
    rgba(255, 255, 255, 0.35) 45%,
    transparent 75%
  );
  transform: scale(0);
  animation: liquidRippleBurst 0.65s cubic-bezier(0.1, 0.85, 0.25, 1) forwards;
}

@keyframes liquidRippleBurst {
  0% {
    transform: scale(0);
    opacity: 0.95;
  }
  100% {
    transform: scale(24);
    opacity: 0;
  }
}

/* --------------------------------------------------------------------------
   PRIMARY BUTTON: Sapphire Liquid Glass
   -------------------------------------------------------------------------- */
.btn-apple-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  background: linear-gradient(180deg, rgba(0, 113, 227, 0.94) 0%, rgba(0, 92, 204, 0.98) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.38);
  cursor: pointer;
  backdrop-filter: blur(24px) saturate(200%);
  -webkit-backdrop-filter: blur(24px) saturate(200%);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.65),
    inset 0 -1.5px 2px 0 rgba(0, 42, 128, 0.4),
    0 6px 22px -3px rgba(0, 113, 227, 0.4),
    0 2px 6px -1px rgba(0, 0, 0, 0.08);
  transition: 
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    border-color 0.3s ease,
    background 0.3s ease;
}

.btn-apple-primary:hover {
  background: linear-gradient(180deg, rgba(10, 122, 235, 0.96) 0%, rgba(0, 102, 222, 1) 100%);
  border-color: rgba(255, 255, 255, 0.62);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.88),
    inset 0 -1.5px 2px 0 rgba(0, 42, 128, 0.35),
    0 12px 32px -4px rgba(0, 113, 227, 0.54),
    0 4px 10px rgba(0, 0, 0, 0.08);
}

.btn-apple-primary:hover svg {
  transform: translateX(3px);
}

.btn-apple-primary:active {
  transform: translateY(0.5px) scale(0.975);
  box-shadow: 
    inset 0 2px 4px 0 rgba(0, 24, 78, 0.5),
    0 2px 8px rgba(0, 113, 227, 0.3);
  transition-duration: 0.1s;
}

[data-theme="dark"] .btn-apple-primary {
  background: linear-gradient(180deg, rgba(41, 151, 255, 0.9) 0%, rgba(0, 113, 227, 0.96) 100%);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.75),
    inset 0 -2px 3px 0 rgba(0, 30, 90, 0.55),
    0 8px 28px -2px rgba(41, 151, 255, 0.45),
    0 2px 8px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .btn-apple-primary:hover {
  background: linear-gradient(180deg, rgba(64, 165, 255, 0.96) 0%, rgba(10, 126, 245, 1) 100%);
  border-color: rgba(255, 255, 255, 0.72);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.96),
    inset 0 -2px 3px 0 rgba(0, 30, 90, 0.45),
    0 14px 38px -2px rgba(41, 151, 255, 0.65),
    0 4px 12px rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------------------------
   SECONDARY BUTTON: Crystal Clear Liquid Glass
   -------------------------------------------------------------------------- */
.btn-apple-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, rgba(244, 244, 248, 0.72) 100%);
  color: var(--text-primary);
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.92);
  cursor: pointer;
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 1),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.05),
    0 4px 18px -2px rgba(0, 0, 0, 0.06),
    0 1px 3px rgba(0, 0, 0, 0.03);
  transition: 
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    border-color 0.3s ease,
    background 0.3s ease;
}

.btn-apple-secondary:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(248, 248, 252, 0.88) 100%);
  border-color: #FFFFFF;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 
    inset 0 2px 2px 0 #FFFFFF,
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.03),
    0 10px 28px -3px rgba(0, 0, 0, 0.09),
    0 2px 6px rgba(0, 0, 0, 0.04);
}

.btn-apple-secondary:active {
  transform: translateY(0.5px) scale(0.975);
  box-shadow: 
    inset 0 2px 3px 0 rgba(0, 0, 0, 0.12),
    0 2px 6px rgba(0, 0, 0, 0.04);
  transition-duration: 0.1s;
}

[data-theme="dark"] .btn-apple-secondary {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.13) 0%, rgba(255, 255, 255, 0.05) 100%);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.28),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.35),
    0 6px 22px -3px rgba(0, 0, 0, 0.45);
}

[data-theme="dark"] .btn-apple-secondary:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.09) 100%);
  border-color: rgba(255, 255, 255, 0.34);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.42),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.3),
    0 12px 32px -3px rgba(0, 0, 0, 0.6);
}

/* Key Metrics Strip */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1020px;
  margin: 0 auto;
}

.metric-pill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform 0.2s ease;
}

.metric-pill-card:hover {
  transform: translateY(-2px);
}

.metric-num {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.metric-num span.accent {
  color: var(--apple-blue);
}

.metric-desc {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   SECTION COMMON STYLES
   ========================================================================== */
.apple-section {
  padding: 80px 0;
}

.section-header-centered {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 54px;
}

.section-eyebrow {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--apple-blue);
  margin-bottom: 12px;
}

.section-title-large {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-lead-text {
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ==========================================================================
   STATEMENT OF PURPOSE / ACADEMIC VISION (Quote Card)
   ========================================================================== */
.vision-banner-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-card);
  position: relative;
  margin-bottom: 48px;
}

.vision-quote {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.vision-author-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
}

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

.author-avatar-initial {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--apple-blue-subtle);
  color: var(--apple-blue);
  font-weight: 700;
  font-size: 17px;
  display: grid;
  place-items: center;
}

.author-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.author-role {
  font-size: 13px;
  color: var(--text-tertiary);
}

.author-flags {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.lang-pill {
  padding: 4px 12px;
  background: var(--bg-card-subtle);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ==========================================================================
   FLAGSHIP RESEARCH: AIM.EXAM & EDTECH (Apple Showcase)
   ========================================================================== */
.apple-showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-bottom: 40px;
}

.showcase-content-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}

.showcase-info-side {
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.showcase-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.badge-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--apple-purple-subtle);
  color: var(--apple-purple);
}

.badge-status {
  font-size: 12px;
  color: var(--apple-green);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.showcase-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.showcase-body-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.challenge-solution-box {
  background: var(--bg-canvas);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.item-row {
  display: flex;
  gap: 12px;
}

.item-icon-circle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.icon-red {
  background: rgba(255, 59, 48, 0.1);
  color: #FF3B30;
}

.icon-blue {
  background: var(--apple-blue-subtle);
  color: var(--apple-blue);
}

.item-content h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.item-content p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* Interactive OMR Sheet Apple Stage */
.showcase-demo-side {
  background: #F0F0F3;
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .showcase-demo-side {
  background: #141416;
}

.apple-omr-paper {
  background: #FFFFFF;
  color: #1D1D1F;
  border-radius: var(--radius-md);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.12);
  width: 100%;
  max-width: 360px;
  padding: 24px 20px;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
  position: relative;
}

.omr-sheet-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 2px solid #1D1D1F;
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.sheet-title-text {
  font-weight: 800;
  font-size: 12px;
  letter-spacing: -0.01em;
}

.sheet-id-text {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #86868B;
}

.sheet-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.sheet-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bubble-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 700;
}

.q-label {
  width: 20px;
  color: #86868B;
  font-family: var(--font-mono);
}

.bubble-group {
  display: flex;
  gap: 5px;
}

.apple-bubble {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid #C7C7CC;
  display: grid;
  place-items: center;
  font-size: 9px;
  font-weight: 700;
  color: #8E8E93;
  cursor: pointer;
  background: #FFFFFF;
  transition: all 0.15s ease;
  position: relative;
  touch-action: manipulation;
}

.apple-bubble::before {
  content: "";
  position: absolute;
  top: -8px;
  bottom: -8px;
  left: -6px;
  right: -6px;
}

.apple-bubble:hover {
  border-color: #0071E3;
  background: #F2F7FF;
}

.apple-bubble.filled {
  background: #1D1D1F;
  border-color: #1D1D1F;
  color: #FFFFFF;
}

.apple-bubble.eval-correct {
  background: #34C759 !important;
  border-color: #34C759 !important;
  color: #FFFFFF !important;
}

.apple-bubble.eval-wrong {
  background: #FF3B30 !important;
  border-color: #FF3B30 !important;
  color: #FFFFFF !important;
}

/* Demo Controls Bar */
.demo-controls-bar {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 360px;
}

.btn-demo-run {
  flex: 1;
  padding: 11px 18px;
  background: linear-gradient(180deg, rgba(0, 113, 227, 0.94) 0%, rgba(0, 92, 204, 0.98) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.38);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.65),
    inset 0 -1.5px 2px 0 rgba(0, 42, 128, 0.4),
    0 4px 16px -2px rgba(0, 113, 227, 0.38);
  transition: 
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    border-color 0.25s ease,
    background 0.25s ease;
}

.btn-demo-run:hover {
  background: linear-gradient(180deg, rgba(10, 122, 235, 0.96) 0%, rgba(0, 102, 222, 1) 100%);
  border-color: rgba(255, 255, 255, 0.62);
  transform: translateY(-1.5px) scale(1.02);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.88),
    0 8px 24px -2px rgba(0, 113, 227, 0.52);
}

.btn-demo-run:active {
  transform: translateY(0.5px) scale(0.975);
  box-shadow: 
    inset 0 2px 4px 0 rgba(0, 24, 78, 0.5),
    0 2px 6px rgba(0, 113, 227, 0.3);
  transition-duration: 0.1s;
}

[data-theme="dark"] .btn-demo-run {
  background: linear-gradient(180deg, rgba(41, 151, 255, 0.9) 0%, rgba(0, 113, 227, 0.96) 100%);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.75),
    0 6px 20px -2px rgba(41, 151, 255, 0.45);
}

[data-theme="dark"] .btn-demo-run:hover {
  background: linear-gradient(180deg, rgba(64, 165, 255, 0.96) 0%, rgba(10, 126, 245, 1) 100%);
  border-color: rgba(255, 255, 255, 0.72);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.96),
    0 10px 28px -2px rgba(41, 151, 255, 0.65);
}

.btn-demo-tilt {
  padding: 11px 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, rgba(244, 244, 248, 0.72) 100%);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(20px) saturate(190%);
  -webkit-backdrop-filter: blur(20px) saturate(190%);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 1),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.04),
    0 3px 12px rgba(0, 0, 0, 0.05);
  transition: 
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    border-color 0.25s ease,
    background 0.25s ease;
}

.btn-demo-tilt:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(248, 248, 252, 0.88) 100%);
  border-color: #FFFFFF;
  transform: translateY(-1.5px) scale(1.02);
  box-shadow: 
    inset 0 2px 2px 0 #FFFFFF,
    0 6px 20px rgba(0, 0, 0, 0.08);
}

.btn-demo-tilt:active {
  transform: translateY(0.5px) scale(0.975);
  box-shadow: 
    inset 0 2px 3px 0 rgba(0, 0, 0, 0.12),
    0 2px 6px rgba(0, 0, 0, 0.04);
  transition-duration: 0.1s;
}

[data-theme="dark"] .btn-demo-tilt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.13) 0%, rgba(255, 255, 255, 0.05) 100%);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.28),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.35),
    0 4px 16px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .btn-demo-tilt:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.09) 100%);
  border-color: rgba(255, 255, 255, 0.34);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.42),
    0 8px 24px rgba(0, 0, 0, 0.5);
}

.demo-status-pill {
  margin-top: 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   ACADEMIC & PRODUCTION PORTFOLIO (Apple Bento Cards)
   ========================================================================== */
.apple-bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}

.bento-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease;
}

.bento-box:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.box-span-8 { grid-column: span 8; }
.box-span-4 { grid-column: span 4; }
.box-span-6 { grid-column: span 6; }
.box-span-12 { grid-column: span 12; }

.box-top-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.category-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--apple-blue);
  background: var(--apple-blue-subtle);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.box-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.box-desc {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.academic-value-callout {
  background: var(--bg-canvas);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-primary);
  margin-bottom: 24px;
  border-left: 3px solid var(--apple-blue);
}

.tech-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.apple-pill-tag {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-canvas);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.box-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
}

.meta-stat {
  font-size: 13px;
  color: var(--text-tertiary);
}

.meta-stat strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   ACADEMIC JOURNEY & EXTRACURRICULAR TIMELINE
   ========================================================================== */
.timeline-cards-flow {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.timeline-card-apple {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  align-items: flex-start;
  transition: transform 0.2s ease;
}

.timeline-card-apple:hover {
  transform: translateX(4px);
}

.time-badge-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.time-year {
  font-size: 15px;
  font-weight: 700;
  color: var(--apple-blue);
}

.time-place {
  font-size: 13px;
  color: var(--text-tertiary);
}

.time-body-col h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.time-body-col p {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ==========================================================================
   COMPETENCIES & LANGUAGES STRIP
   ========================================================================== */
.skills-apple-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-apple-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

.skill-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
}

.icon-bg-blue { background: var(--apple-blue-subtle); color: var(--apple-blue); }
.icon-bg-purple { background: var(--apple-purple-subtle); color: var(--apple-purple); }
.icon-bg-green { background: var(--apple-green-subtle); color: var(--apple-green); }

.skill-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.skill-check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skill-check-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  color: var(--text-secondary);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.skill-check-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.skill-check-item span.level {
  font-weight: 600;
  color: var(--text-primary);
}

/* ==========================================================================
   ADMISSIONS CONTACT & INTERACTION
   ========================================================================== */
.contact-apple-shell {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 56px;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.contact-left-col h3 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.contact-left-col p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.contact-buttons-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-pill-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, rgba(244, 244, 248, 0.7) 100%);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: var(--radius-pill);
  text-decoration: none;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(20px) saturate(190%);
  -webkit-backdrop-filter: blur(20px) saturate(190%);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 1),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.04),
    0 4px 18px rgba(0, 0, 0, 0.04);
  transition: 
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    background 0.3s ease,
    border-color 0.3s ease;
}

.contact-pill-btn:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(248, 248, 252, 0.88) 100%);
  border-color: #FFFFFF;
  transform: translateY(-2px) translateX(4px);
  box-shadow: 
    inset 0 2px 2px 0 #FFFFFF,
    0 10px 28px rgba(0, 0, 0, 0.08);
}

.contact-pill-btn:active {
  transform: translateY(0) translateX(2px) scale(0.985);
  box-shadow: 
    inset 0 2px 3px 0 rgba(0, 0, 0, 0.12),
    0 2px 6px rgba(0, 0, 0, 0.04);
  transition-duration: 0.1s;
}

[data-theme="dark"] .contact-pill-btn {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.04) 100%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.22),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.3),
    0 6px 20px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .contact-pill-btn:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0.08) 100%);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.35),
    0 12px 30px rgba(0, 0, 0, 0.5);
}

.contact-form-apple {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.apple-input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.apple-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-secondary);
}

.apple-input, .apple-textarea {
  background: var(--bg-canvas);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.apple-input:focus, .apple-textarea:focus {
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.apple-textarea {
  min-height: 110px;
  resize: vertical;
}

/* Footer */
.site-footer {
  padding: 56px 0 40px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 80px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.footer-content-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-card-hover);
  animation: apple-toast 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes apple-toast {
  from { opacity: 0; transform: translateY(10px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ==========================================================================
   MINIMAL ELEGANT ANIMATIONS (Apple Cupertino / Linear Aesthetic)
   ========================================================================== */

/* Scroll-triggered Entry Reveal */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(22px);
  transition: 
    opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Subtle Breathing Pulse for Live Research Status Indicator */
.badge-status svg {
  animation: applePulseDot 2.4s ease-in-out infinite;
}

@keyframes applePulseDot {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.85);
  }
}

/* Sticky Header Scroll Dynamic Elevation */
.site-header {
  transition: top 0.25s ease;
}

.site-header.is-scrolled .nav-blur-shell {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08), inset 0 1px 1.5px rgba(255, 255, 255, 0.95);
  background: rgba(255, 255, 255, 0.86);
}

[data-theme="dark"] .site-header.is-scrolled .nav-blur-shell {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.65), inset 0 1px 1px rgba(255, 255, 255, 0.18);
  background: rgba(24, 24, 26, 0.86);
}

/* Active Nav Link Highlight */
.nav-item-link.nav-active {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .nav-item-link.nav-active {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.12);
}

/* Mobile Drawer Smooth Slide & Stagger Animation */
.mobile-nav-drawer {
  transition: 
    opacity 0.26s cubic-bezier(0.16, 1, 0.3, 1), 
    transform 0.26s cubic-bezier(0.34, 1.35, 0.64, 1);
}

.mobile-nav-drawer.active .mobile-nav-link {
  animation: navDrawerItemIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}

.mobile-nav-drawer.active .mobile-nav-list li:nth-child(1) .mobile-nav-link { animation-delay: 30ms; }
.mobile-nav-drawer.active .mobile-nav-list li:nth-child(2) .mobile-nav-link { animation-delay: 60ms; }
.mobile-nav-drawer.active .mobile-nav-list li:nth-child(3) .mobile-nav-link { animation-delay: 90ms; }
.mobile-nav-drawer.active .mobile-nav-list li:nth-child(4) .mobile-nav-link { animation-delay: 120ms; }
.mobile-nav-drawer.active .mobile-nav-list li:nth-child(5) .mobile-nav-link { animation-delay: 150ms; }
.mobile-nav-drawer.active .mobile-nav-list li:nth-child(6) .mobile-nav-link { animation-delay: 180ms; }

@keyframes navDrawerItemIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   COMPREHENSIVE MOBILE & RESPONSIVE OPTIMIZATION
   ========================================================================== */

/* Touch manipulation on interactive items to eliminate 300ms tap delay */
button, a, .apple-bubble, .lang-pill-btn, .btn-apple-icon {
  touch-action: manipulation;
}

/* Tablet (1040px) */
@media (max-width: 1040px) {
  .nav-item-link {
    padding: 5px 8px;
    font-size: 12.5px;
  }
}

/* Tablet & Large Mobile (1024px) */
@media (max-width: 1024px) {
  .showcase-content-grid, .contact-apple-shell {
    grid-template-columns: 1fr;
  }
  
  .box-span-8, .box-span-4, .box-span-6 {
    grid-column: span 12;
  }
  
  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .skills-apple-grid {
    grid-template-columns: 1fr;
  }
}

/* Nav collapse point (900px) */
@media (max-width: 900px) {
  .nav-menu {
    display: none !important;
  }
  
  .btn-menu-toggle {
    display: grid !important;
  }
}

/* Phone Layout Breakpoint (768px) */
@media (max-width: 768px) {
  .apple-section {
    padding: 56px 0;
  }

  .section-header-centered {
    margin-bottom: 36px;
  }

  .section-title-large {
    font-size: clamp(26px, 6.5vw, 36px);
  }

  .section-lead-text {
    font-size: 15.5px;
    line-height: 1.55;
  }

  .vision-banner-card {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
  }

  .vision-quote {
    font-size: 18px;
    line-height: 1.45;
    margin-bottom: 20px;
  }

  .vision-author-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 18px;
  }

  .author-flags {
    width: 100%;
  }

  .apple-bento-grid {
    gap: 16px;
    margin-bottom: 36px;
  }

  .bento-box {
    padding: 24px 20px;
    border-radius: var(--radius-lg);
  }

  .box-title {
    font-size: 20px;
  }

  .academic-value-callout {
    padding: 14px 16px;
    font-size: 13px;
  }

  .showcase-info-side {
    padding: 28px 20px;
  }

  .showcase-demo-side {
    padding: 28px 16px;
    border-left: none;
    border-top: 1px solid var(--border-subtle);
  }

  .showcase-title {
    font-size: 23px;
  }

  .box-footer-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-top: 18px;
  }

  .timeline-card-apple {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 20px 18px;
    border-radius: var(--radius-lg);
  }

  .skill-apple-card {
    padding: 24px 20px;
    border-radius: var(--radius-lg);
  }

  .contact-apple-shell {
    padding: 32px 20px;
    border-radius: var(--radius-lg);
    gap: 36px;
  }

  .contact-left-col h3 {
    font-size: 26px;
  }

  .contact-left-col p {
    font-size: 15px;
    margin-bottom: 24px;
  }

  .contact-pill-btn {
    padding: 14px 18px;
    font-size: 13.5px;
  }
}

/* Mobile Screens (640px) */
@media (max-width: 640px) {
  .hero-wrapper {
    padding: 24px 0 44px;
  }

  .hero-headline {
    font-size: clamp(28px, 8.5vw, 42px);
    letter-spacing: -0.035em;
    margin-bottom: 16px;
  }

  .hero-subhead {
    font-size: 15.5px;
    line-height: 1.55;
    margin-bottom: 28px;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
    gap: 10px;
    margin-bottom: 40px;
  }

  .hero-buttons .btn-apple-primary,
  .hero-buttons .btn-apple-secondary {
    width: 100%;
    justify-content: center;
    padding: 14px 20px;
  }

  .admissions-pill {
    font-size: 12px;
    padding: 6px 14px;
    white-space: normal;
    text-align: center;
    line-height: 1.4;
    margin-bottom: 20px;
  }

  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .metric-pill-card {
    padding: 18px 12px;
    border-radius: var(--radius-md);
  }

  .metric-num {
    font-size: 26px;
  }

  .metric-desc {
    font-size: 10.5px;
  }

  .demo-controls-bar {
    flex-direction: column;
    width: 100%;
    gap: 8px;
  }

  .btn-demo-run, .btn-demo-tilt {
    width: 100%;
    justify-content: center;
  }

  .site-footer {
    padding: 40px 0 32px;
    margin-top: 56px;
  }

  .footer-content-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

/* Small Phones (480px) */
@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .site-header {
    top: 8px;
    margin-bottom: 20px;
  }

  .brand-badge {
    display: none;
  }

  .nav-blur-shell {
    padding: 6px 10px;
    gap: 6px;
  }

  .brand-initial {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  .brand-name {
    font-size: 13px;
  }

  .nav-actions {
    gap: 4px;
  }

  .btn-apple-icon {
    width: 32px;
    height: 32px;
  }

  .btn-apple-icon svg {
    width: 14px;
    height: 14px;
  }

  .lang-segmented-control {
    padding: 2px;
    gap: 1px;
  }

  .lang-pill-btn {
    padding: 4px 7px;
    font-size: 10px;
  }

  .mobile-nav-drawer {
    left: 12px;
    right: 12px;
    padding: 8px;
    border-radius: 18px;
  }

  .mobile-nav-link {
    padding: 12px 14px;
    font-size: 14px;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .apple-omr-paper {
    padding: 16px 10px;
    max-width: 100%;
  }

  .omr-sheet-top {
    padding-bottom: 8px;
    margin-bottom: 12px;
  }

  .sheet-title-text {
    font-size: 11px;
  }

  .sheet-id-text {
    font-size: 9.5px;
  }

  .bubble-row {
    gap: 5px;
  }

  .q-label {
    width: 18px;
    font-size: 11px;
  }

  .bubble-group {
    gap: 3px;
  }

  .apple-bubble {
    width: 24px;
    height: 24px;
    font-size: 10px;
  }

  .contact-pill-btn {
    padding: 13px 16px;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 4px;
  }

  .contact-pill-btn span:last-child {
    font-size: 12px;
  }
}

/* Compact Screens (360px) */
@media (max-width: 360px) {
  .metrics-strip {
    grid-template-columns: 1fr;
  }

  .brand-name {
    display: none;
  }
}

/* Accessibility: Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .btn-apple-primary::after,
  .btn-apple-secondary::after,
  .btn-demo-run::after,
  .btn-demo-tilt::after,
  .contact-pill-btn::after {
    animation: none !important;
  }

  .liquid-glass-ripple {
    display: none !important;
  }

  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .badge-status svg {
    animation: none !important;
  }

  .mobile-nav-drawer.active .mobile-nav-link {
    animation: none !important;
  }
}