/* ============================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Backgrounds */
  --bg-primary: #0F172A;
  --bg-elevated: #111c34;
  --bg-subtle: #192640;
  --bg-inset: #0b1428;

  /* Borders */
  --border-default: rgba(148, 163, 184, 0.24);
  --border-hover: rgba(148, 163, 184, 0.44);
  --border-accent: rgba(99, 102, 241, 0.46);

  /* Text */
  --text-primary: #f4f7ff;
  --text-secondary: #c4cde0;
  --text-muted: #8c99b6;

  /* Accent */
  --accent: #4F46E5;
  --accent-hover: #7C3AED;
  --accent-subtle: rgba(79, 70, 229, 0.16);
  --accent-border: rgba(79, 70, 229, 0.54);

  /* Gradients */
  --gradient-accent: linear-gradient(120deg, #4F46E5 0%, #7C3AED 50%, #2563EB 100%);
  --gradient-accent-hover: linear-gradient(120deg, #4338CA 0%, #6D28D9 50%, #1D4ED8 100%);
  --gradient-text: linear-gradient(120deg, #4F46E5 0%, #7C3AED 50%, #2563EB 100%);
  --gradient-glow: radial-gradient(ellipse, rgba(79, 70, 229, 0.38) 0%, transparent 72%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.32);
  --shadow-glow-lg: 0 0 80px rgba(79, 70, 229, 0.4);

  /* Semantic */
  --success: #22c55e;
  --success-subtle: rgba(34, 197, 94, 0.1);
  --warning: #eab308;
  --warning-subtle: rgba(234, 179, 8, 0.1);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-navbar: 500;
  --z-chatbot: 1000;
  --z-overlay: 1000;

  /* Nav */
  --nav-bg: rgba(15, 23, 42, 0.82);
  --mobile-menu-bg: var(--bg-primary);
}

/* ============================================
   LIGHT THEME
   ============================================ */
[data-theme="light"] {
  --bg-primary: #f8faff;
  --bg-elevated: #ffffff;
  --bg-subtle: #f4f6ff;
  --bg-inset: #f6f8ff;

  --border-default: #d7def3;
  --border-hover: #bfc9ea;
  --border-accent: rgba(79, 70, 229, 0.36);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --accent-subtle: rgba(79, 70, 229, 0.12);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.18);
  --shadow-glow-lg: 0 0 80px rgba(79, 70, 229, 0.24);

  --gradient-glow: radial-gradient(ellipse, rgba(79, 70, 229, 0.18) 0%, transparent 70%);

  --nav-bg: rgba(248, 250, 255, 0.88);
  --mobile-menu-bg: var(--bg-primary);
}

/* ============================================
   2. RESET & BASE
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(ellipse 75% 55% at 15% 0%, rgba(79, 70, 229, 0.2), transparent 70%),
    radial-gradient(ellipse 70% 55% at 90% 10%, rgba(37, 99, 235, 0.14), transparent 75%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease, background-image 0.4s ease;
}

[data-theme="light"] body {
  background-image: linear-gradient(135deg, #F8FAFF, #EEF2FF);
}

body.menu-open {
  overflow: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-primary);
}

h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  transition: color 0.4s ease;
}

h1 { font-size: 2.75rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; }
h4 { font-size: 1.125rem; font-weight: 600; letter-spacing: 0; line-height: 1.4; }

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

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

code {
  font-family: var(--font-code);
  font-size: 0.875rem;
}

ul { list-style: none; }

::selection {
  background: rgba(79, 70, 229, 0.3);
  color: var(--text-primary);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================
   3. LAYOUT
   ============================================ */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-narrow {
  max-width: 800px;
}

.section {
  padding: var(--space-16) 0;
  position: relative;
}

.section + .section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: min(92%, 1100px);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent 0%, rgba(79, 70, 229, 0.5) 20%, rgba(124, 58, 237, 0.72) 50%, rgba(37, 99, 235, 0.5) 80%, transparent 100%);
}

main > #about.section {
  background: rgba(255, 255, 255, 0.02);
}

main > #skills.section {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(37, 99, 235, 0.05));
}

main > #projects.section {
  background: rgba(255, 255, 255, 0.01);
}

main > #experience.section {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.09), rgba(37, 99, 235, 0.06));
}

[data-theme="light"] main > #about.section {
  background: rgba(255, 255, 255, 0.72);
}

[data-theme="light"] main > #skills.section {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(37, 99, 235, 0.05));
}

[data-theme="light"] main > #projects.section {
  background: #ffffff;
}

[data-theme="light"] main > #experience.section {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.09), rgba(37, 99, 235, 0.06));
}

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

/* ============================================
   4. COMPONENTS
   ============================================ */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease-out-expo), box-shadow 0.25s var(--ease-out-expo), background-position 0.35s ease, color 0.25s ease, border-color 0.25s ease;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
}

.btn-primary {
  background: var(--gradient-accent);
  background-size: 200% 200%;
  color: #fff;
  border-color: transparent;
  box-shadow: 0 14px 32px rgba(79, 70, 229, 0.42);
}

.btn-primary:hover {
  background-size: 200% 200%;
  background-position: 100% 0;
  color: #fff;
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 24px 44px rgba(79, 70, 229, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: rgba(79, 70, 229, 0.5);
  box-shadow: 0 6px 14px rgba(2, 6, 23, 0.2);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.16), rgba(139, 92, 246, 0.16), rgba(59, 130, 246, 0.16));
  color: var(--text-primary);
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
  padding: 8px 16px;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--accent-subtle);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* --- Tags --- */
.tag {
  display: inline-block;
  padding: 5px 12px;
  font-size: 0.8125rem;
  color: var(--text-primary);
  background: linear-gradient(120deg, rgba(79, 70, 229, 0.16), rgba(124, 58, 237, 0.12), rgba(37, 99, 235, 0.12));
  border: 1px solid rgba(79, 70, 229, 0.3);
  border-radius: var(--radius-full);
  line-height: 1.4;
  transition: all 0.25s ease;
  box-shadow: 0 0 14px rgba(79, 70, 229, 0.14);
}

.tag:hover {
  border-color: rgba(79, 70, 229, 0.56);
  color: var(--accent);
  background: linear-gradient(120deg, rgba(79, 70, 229, 0.26), rgba(124, 58, 237, 0.2), rgba(37, 99, 235, 0.2));
  box-shadow: 0 0 20px rgba(79, 70, 229, 0.26);
  transform: scale(1.04);
}

/* --- Badges --- */
.badge {
  display: inline-block;
  padding: 5px 11px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

.badge-success {
  color: var(--success);
  background: var(--success-subtle);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.badge-warning {
  color: var(--warning);
  background: var(--warning-subtle);
  border: 1px solid rgba(234, 179, 8, 0.2);
}

.badge-accent {
  color: #e9e9ff;
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.45), rgba(139, 92, 246, 0.42), rgba(59, 130, 246, 0.42));
  border: 1px solid rgba(139, 92, 246, 0.6);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.22);
}

.badge-flagship {
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.6875rem;
  padding: 6px 12px;
  box-shadow: 0 10px 22px rgba(99, 102, 241, 0.35);
}

/* --- Cards --- */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all 0.3s var(--ease-out-expo);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  position: relative;
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header h2 {
  display: inline-block;
  position: relative;
  padding-bottom: 10px;
}

.section-header h2::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
  box-shadow: 0 0 14px rgba(99, 102, 241, 0.3);
}

.section-header p {
  color: var(--text-secondary);
  margin-top: var(--space-3);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-rule {
  width: 80px;
  height: 3px;
  background: var(--gradient-accent);
  margin: var(--space-4) auto 0;
  border-radius: var(--radius-full);
  box-shadow: 0 0 16px rgba(79, 70, 229, 0.42);
}

/* --- Code Blocks (project pages) --- */
pre {
  background: var(--bg-inset);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  margin: var(--space-4) 0 var(--space-6);
}

pre code {
  font-family: var(--font-code);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.code-comment { color: var(--text-muted); }

.code-block {
  background: var(--bg-inset);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.code-block .comment { color: var(--text-muted); }
.code-block .keyword { color: var(--accent); }
.code-block .fn { color: #818cf8; }
.code-block .string { color: #a5b4fc; }
.code-block .accent-text { color: var(--success); }

.code-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}

/* ============================================
   5. NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid transparent;
  z-index: var(--z-navbar);
  transition: border-color var(--transition-base), background 0.4s ease;
}

.nav.scrolled {
  border-bottom-color: var(--border-default);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--text-primary);
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s var(--ease-out-expo);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  transform: scaleX(1);
}

/* Nav right side */
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-subtle);
  cursor: pointer;
  transition: all 0.25s ease;
  color: var(--text-secondary);
  padding: 0;
}

.theme-toggle:hover {
  border-color: var(--accent-border);
  color: var(--accent);
  background: var(--accent-subtle);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

.theme-icon-sun { display: none; }
.theme-icon-moon { display: block; }

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

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: calc(var(--z-overlay) + 1);
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--mobile-menu-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  z-index: calc(var(--z-overlay) + 2);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.mobile-link:hover {
  color: var(--text-primary);
}

/* ============================================
   6. SECTIONS
   ============================================ */

/* --- 6a. Hero --- */
.hero {
  display: flex;
  align-items: center;
  padding-top: calc(64px + var(--space-8));
  padding-bottom: var(--space-16);
  position: relative;
  overflow: visible;
}

/* Gradient mesh background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 82% 62% at 20% 40%, rgba(79, 70, 229, 0.34) 0%, transparent 62%),
    radial-gradient(ellipse 62% 82% at 80% 20%, rgba(124, 58, 237, 0.28) 0%, transparent 62%),
    radial-gradient(ellipse 55% 55% at 50% 80%, rgba(37, 99, 235, 0.24) 0%, transparent 52%);
  animation: meshFloat 25s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  text-align: center;
}

.hero-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-4);
  padding: 6px 14px;
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.16), rgba(139, 92, 246, 0.16), rgba(59, 130, 246, 0.12));
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-full);
  box-shadow: 0 10px 24px rgba(99, 102, 241, 0.18);
}

.hero-headline {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.hero-headline .accent {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 22px rgba(79, 70, 229, 0.65);
}

.hero-sub {
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #b8bafc;
  margin-bottom: var(--space-6);
  opacity: 1;
}

.hero-summary {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-8);
}

.hero-framework {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
  font-size: 0.95rem;
  line-height: 1.35;
  color: var(--text-primary);
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.14), rgba(139, 92, 246, 0.12), rgba(59, 130, 246, 0.12));
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: 999px;
  padding: 10px 18px;
  margin-bottom: var(--space-8);
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.16);
}

.hero-framework-lead,
.hero-framework-sep,
.hero-framework-tail,
.hero-framework strong {
  display: inline;
  vertical-align: middle;
}

.hero-framework-lead {
  white-space: nowrap;
}

.hero-framework-tail {
  white-space: nowrap;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-8);
}

.hero-socials {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  justify-content: center;
}

.hero-socials a {
  color: var(--text-muted);
  transition: color var(--transition-fast), transform 0.25s var(--ease-out-expo);
  display: flex;
}

.hero-socials a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-socials svg {
  width: 20px;
  height: 20px;
}

/* Hero photo with glow and float */
.hero-photo-wrapper {
  position: relative;
  flex-shrink: 0;
}

.hero-photo-glow {
  position: absolute;
  inset: -48px;
  background: radial-gradient(circle at center, rgba(79, 70, 229, 0.64) 0%, rgba(124, 58, 237, 0.46) 45%, rgba(37, 99, 235, 0.24) 70%, transparent 100%);
  border-radius: 50%;
  opacity: 0.95;
  filter: blur(34px);
  animation: glowPulse 4s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(79, 70, 229, 0.56);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  animation: float 6s ease-in-out infinite;
  box-shadow: var(--shadow-xl), 0 0 52px rgba(79, 70, 229, 0.36);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- 6b. About --- */
.about-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.about-text {
  font-size: 1rem;
  line-height: 1.8;
}

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

.stat-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  transition: all 0.3s var(--ease-out-expo);
  box-shadow: var(--shadow-sm);
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-1);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.about-education {
  margin-top: var(--space-10);
  padding: var(--space-5);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border-top: 2px solid var(--accent);
}

.about-education h3 {
  font-size: 1rem;
  margin-bottom: var(--space-2);
}

.about-education p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

/* --- 6c. Skills --- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.skill-group-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

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

.skill-group .tag {
  border-radius: var(--radius-full);
  box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.08), 0 0 16px rgba(99, 102, 241, 0.08);
}

.skill-group-languages .tag {
  color: #bfdbfe;
  background: linear-gradient(120deg, rgba(59, 130, 246, 0.32), rgba(37, 99, 235, 0.26));
  border-color: rgba(59, 130, 246, 0.58);
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.26);
}

.skill-group-ml .tag {
  color: #ddd6fe;
  background: linear-gradient(120deg, rgba(139, 92, 246, 0.34), rgba(124, 58, 237, 0.24));
  border-color: rgba(139, 92, 246, 0.62);
  box-shadow: 0 0 18px rgba(139, 92, 246, 0.28);
}

.skill-group-frameworks .tag {
  color: #a5f3fc;
  background: linear-gradient(120deg, rgba(34, 211, 238, 0.3), rgba(6, 182, 212, 0.22));
  border-color: rgba(34, 211, 238, 0.56);
  box-shadow: 0 0 18px rgba(6, 182, 212, 0.26);
}

.skill-group-devops .tag {
  color: #fed7aa;
  background: linear-gradient(120deg, rgba(249, 115, 22, 0.3), rgba(234, 88, 12, 0.22));
  border-color: rgba(249, 115, 22, 0.56);
  box-shadow: 0 0 18px rgba(249, 115, 22, 0.26);
}

[data-theme="light"] .hero-sub {
  color: #4338ca;
}

[data-theme="light"] .hero-framework {
  color: #1e1b4b;
}

[data-theme="light"] .skill-group-languages .tag {
  color: #1d4ed8;
  background: linear-gradient(120deg, rgba(59, 130, 246, 0.12), rgba(37, 99, 235, 0.1));
}

[data-theme="light"] .skill-group-ml .tag {
  color: #6d28d9;
  background: linear-gradient(120deg, rgba(139, 92, 246, 0.14), rgba(124, 58, 237, 0.1));
}

[data-theme="light"] .skill-group-frameworks .tag {
  color: #0e7490;
  background: linear-gradient(120deg, rgba(34, 211, 238, 0.14), rgba(6, 182, 212, 0.1));
}

[data-theme="light"] .skill-group-devops .tag {
  color: #c2410c;
  background: linear-gradient(120deg, rgba(249, 115, 22, 0.14), rgba(234, 88, 12, 0.1));
}

/* --- 6d. Projects --- */
.project-featured {
  margin-bottom: var(--space-10);
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 38px rgba(2, 6, 23, 0.32);
  transition: transform 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo);
}

/* Animated gradient border */
.project-featured::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  padding: 1px;
  background: linear-gradient(135deg, #4F46E5, #7C3AED, #2563EB, #4F46E5);
  background-size: 300% 300%;
  animation: gradientShift 4s ease infinite;
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* Subtle glow behind featured card */
.project-featured::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -25%;
  width: 150%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(79, 70, 229, 0.17) 0%, rgba(124, 58, 237, 0.12) 35%, transparent 70%);
  pointer-events: none;
}

.project-featured:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 26px 60px rgba(15, 23, 42, 0.45), 0 0 50px rgba(79, 70, 229, 0.34);
}

.project-featured-badge {
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 1;
}

.project-featured-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  position: relative;
  z-index: 1;
}

.project-featured-info h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.project-tagline {
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

.project-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.project-featured-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.metric {
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  text-align: center;
  transition: all 0.25s ease;
}

.metric:hover {
  border-color: var(--accent-border);
  box-shadow: 0 0 12px rgba(79, 70, 229, 0.1);
}

.metric-val {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.project-card {
  display: flex;
  flex-direction: column;
}

.card-category {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-default);
}

.card-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast), gap 0.25s ease;
}

.card-link:hover {
  color: var(--accent);
  gap: var(--space-3);
}

.card-link svg {
  width: 16px;
  height: 16px;
}

.card-icon {
  color: var(--text-muted);
  display: flex;
  transition: color var(--transition-fast), transform 0.25s ease;
}

.card-icon:hover {
  color: var(--accent);
  transform: scale(1.1);
}

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

/* --- 6e. Internship --- */
.internship-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

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

.internship-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.internship-company {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.internship-date {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.internship-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.internship-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--border-default));
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-8);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: calc(-1 * var(--space-8) + 0px);
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-subtle), 0 0 16px rgba(79, 70, 229, 0.4);
}

.timeline-content h4 {
  font-size: 1rem;
  margin-bottom: var(--space-2);
}

.timeline-content p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.timeline-content .card-tags {
  margin-bottom: 0;
}

/* --- 6f. Research --- */
.research-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--accent);
  transition: all 0.3s ease;
}

.research-card:hover {
  box-shadow: var(--shadow-md), 0 0 20px rgba(79, 70, 229, 0.08);
}

.research-card .badge {
  margin-bottom: var(--space-4);
}

.research-card h3 {
  font-size: 1.25rem;
  line-height: 1.4;
  margin-bottom: var(--space-2);
}

.research-author {
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: var(--space-5);
}

.research-abstract {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.8;
  padding-left: var(--space-4);
  border-left: 3px solid transparent;
  border-image: var(--gradient-accent) 1;
  margin-bottom: var(--space-6);
  font-style: normal;
}

.research-findings {
  margin-bottom: var(--space-6);
}

.research-findings h4 {
  font-size: 0.9375rem;
  margin-bottom: var(--space-3);
}

.research-findings ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.research-findings li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.6;
}

.research-findings li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.research-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.research-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* --- 6g. Certifications --- */
.cert-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cert-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.cert-item:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md), 0 0 16px rgba(79, 70, 229, 0.08);
  transform: translateY(-1px);
}

.cert-info h4 {
  font-size: 1rem;
  margin-bottom: var(--space-1);
}

.cert-issuer {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.cert-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.cert-credential {
  font-size: 0.8125rem;
  font-family: var(--font-code);
  color: var(--text-muted);
  margin-top: var(--space-2);
  display: block;
}

.cert-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.cert-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* --- 6h. GitHub --- */
.github-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.repo-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  transition: all 0.3s var(--ease-out-expo);
  box-shadow: var(--shadow-sm);
}

.repo-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), 0 0 20px rgba(79, 70, 229, 0.1);
  color: var(--text-secondary);
}

.repo-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.repo-name:hover {
  color: var(--accent-hover);
}

.repo-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.repo-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.repo-meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.repo-lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.github-cta {
  text-align: center;
  margin-top: var(--space-8);
}

.github-fallback {
  text-align: center;
  padding: var(--space-8) 0;
  color: var(--text-muted);
}

.github-fallback p {
  margin-bottom: var(--space-4);
}

/* Skeleton */
.skeleton-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  min-height: 140px;
  position: relative;
  overflow: hidden;
}

.skeleton-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 25%, var(--bg-subtle) 50%, transparent 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

/* --- 6i. Contact --- */
.contact-content {
  max-width: 500px;
  margin: 0 auto;
}

.contact-socials {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.contact-socials a {
  color: var(--text-muted);
  display: flex;
  transition: color var(--transition-fast), transform 0.25s var(--ease-out-expo);
}

.contact-socials a:hover {
  color: var(--accent);
  transform: translateY(-3px) scale(1.05);
}

.contact-socials svg {
  width: 24px;
  height: 24px;
}

.contact-info {
  margin-bottom: var(--space-6);
}

.contact-info p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.contact-languages {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* --- 6j. Footer --- */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--border-default);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.footer-inner p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============================================
   7. AI CHATBOT
   ============================================ */
.chatbot {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-chatbot);
}

.chatbot-toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid rgba(79, 70, 229, 0.35);
  background: var(--gradient-accent);
  backdrop-filter: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.4), 0 0 26px rgba(79, 70, 229, 0.42);
  transition: all 0.3s var(--ease-out-expo);
  color: #ffffff;
  padding: 0;
  position: relative;
}

.chatbot-toggle::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  padding: 1px;
  background: var(--gradient-accent);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.55;
  transition: opacity 0.3s ease;
}

.chatbot-toggle:hover::before {
  opacity: 0.85;
}

.chatbot-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-xl), 0 0 48px rgba(79, 70, 229, 0.5);
  animation: chatbotPulse 1.2s ease-in-out infinite;
}

.chatbot-toggle svg {
  width: 24px;
  height: 24px;
}

.chatbot-toggle.hidden {
  display: none;
}

.chatbot-window {
  position: absolute;
  bottom: 70px;
  right: 0;
  width: 360px;
  max-height: 500px;
  background: var(--bg-elevated);
  border: 1px solid rgba(99, 102, 241, 0.24);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl), 0 0 46px rgba(99, 102, 241, 0.2);
  display: none;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: blur(24px) saturate(130%);
}

.chatbot-window.open {
  display: flex;
  animation: chatbotSlideUp 0.3s var(--ease-out-expo);
}

.chatbot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-default);
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.12), rgba(59, 130, 246, 0.12));
}

.chatbot-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.chatbot-title::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
}

.chatbot-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 4px;
  line-height: 1;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
}

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

.chatbot-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-height: 280px;
  max-height: 340px;
}

.chatbot-msg {
  font-size: 0.8125rem;
  line-height: 1.6;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  max-width: 85%;
  word-wrap: break-word;
}

.chatbot-msg-bot {
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  align-self: flex-start;
  border-bottom-left-radius: var(--radius-sm);
}

.chatbot-msg-user {
  background: var(--gradient-accent);
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: var(--radius-sm);
}

.chatbot-msg-typing {
  align-self: flex-start;
}

.typing-dots {
  display: flex;
  gap: 4px;
  padding: 4px 0;
}

.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typingBounce 1.2s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

.chatbot-input-area {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-default);
  background: var(--bg-subtle);
}

.chatbot-input-area input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.chatbot-input-area input::placeholder {
  color: var(--text-muted);
}

.chatbot-input-area input:focus {
  border-color: var(--accent);
}

.chatbot-send {
  width: 38px;
  height: 38px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s var(--ease-out-expo), box-shadow 0.25s var(--ease-out-expo);
  flex-shrink: 0;
  padding: 0;
}

.chatbot-send:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 18px rgba(99, 102, 241, 0.35);
}

.chatbot-send svg {
  width: 16px;
  height: 16px;
}

/* Chatbot quick actions */
.chatbot-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-2);
}

.chatbot-quick-btn {
  font-size: 0.6875rem;
  padding: 4px 10px;
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-full);
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.06), rgba(59, 130, 246, 0.06));
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

.chatbot-quick-btn:hover {
  border-color: rgba(99, 102, 241, 0.5);
  color: var(--accent);
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.16), rgba(139, 92, 246, 0.14), rgba(59, 130, 246, 0.14));
}

/* ============================================
   8. ANIMATIONS
   ============================================ */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(-1deg); }
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 0.85; }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes meshFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-20px, 10px) scale(1.02); }
  100% { transform: translate(0, 0) scale(1); }
}

@keyframes chatbotSlideUp {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-4px); }
}

@keyframes chatbotPulse {
  0%, 100% {
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.4), 0 0 26px rgba(79, 70, 229, 0.42);
  }
  50% {
    box-shadow: 0 18px 38px rgba(15, 23, 42, 0.45), 0 0 44px rgba(79, 70, 229, 0.56);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out-expo),
              transform 0.7s var(--ease-out-expo);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.reveal.active .reveal-child:nth-child(1)  { transition-delay: 0.06s; }
.reveal.active .reveal-child:nth-child(2)  { transition-delay: 0.12s; }
.reveal.active .reveal-child:nth-child(3)  { transition-delay: 0.18s; }
.reveal.active .reveal-child:nth-child(4)  { transition-delay: 0.24s; }
.reveal.active .reveal-child:nth-child(5)  { transition-delay: 0.30s; }
.reveal.active .reveal-child:nth-child(6)  { transition-delay: 0.36s; }
.reveal.active .reveal-child:nth-child(7)  { transition-delay: 0.42s; }
.reveal.active .reveal-child:nth-child(8)  { transition-delay: 0.48s; }
.reveal.active .reveal-child:nth-child(9)  { transition-delay: 0.54s; }
.reveal.active .reveal-child:nth-child(10) { transition-delay: 0.60s; }
.reveal.active .reveal-child:nth-child(11) { transition-delay: 0.66s; }
.reveal.active .reveal-child:nth-child(12) { transition-delay: 0.72s; }

.reveal-child {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s var(--ease-out-expo),
              transform 0.4s var(--ease-out-expo);
}

.reveal.active .reveal-child {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   9. RESPONSIVE
   ============================================ */

/* Hover effects only on devices that support it */
@media (hover: hover) {
  .card:hover {
    transform: translateY(-4px) scale(1.04);
    border-color: var(--accent-border);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
  }
}

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

  .github-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* MD: 768px */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }

  .section {
    padding: var(--space-20) 0;
  }

  h1 { font-size: 3.25rem; }
  h2 { font-size: 2.25rem; }
  h3 { font-size: 1.5rem; }

  .nav-links {
    display: flex;
  }

  .hamburger {
    display: none;
  }

  .mobile-menu {
    display: none;
  }

  .hero-headline {
    font-size: 3.25rem;
  }

  .hero-sub {
    font-size: 0.9375rem;
  }

  .hero-inner {
    flex-direction: row;
    gap: var(--space-16);
    align-items: center;
  }

  .hero-content {
    text-align: left;
    flex: 1;
  }

  .hero-summary {
    margin-left: 0;
    font-size: 1.125rem;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-socials {
    justify-content: flex-start;
  }

  .hero-photo {
    width: 280px;
    height: 280px;
    border-radius: var(--radius-2xl);
  }

  .about-content {
    flex-direction: row;
    gap: var(--space-12);
  }

  .about-text {
    flex: 3;
  }

  .about-stats {
    flex: 2;
    grid-template-columns: repeat(2, 1fr);
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .internship-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .cert-item {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* LG: 1024px */
@media (min-width: 1024px) {
  .section {
    padding: var(--space-24) 0;
  }

  h1 { font-size: 4rem; }

  .hero-headline {
    font-size: 3.75rem;
  }

  .hero-photo {
    width: 340px;
    height: 340px;
  }

  .hero-summary {
    font-size: 1.1875rem;
    line-height: 1.8;
  }

  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .project-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .project-featured-inner {
    flex-direction: row;
  }

  .project-featured-info {
    flex: 3;
  }

  .project-featured-metrics {
    flex: 1;
    grid-template-columns: 1fr;
  }

  .github-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* XL: 1280px */
@media (min-width: 1280px) {
  h1 { font-size: 4.5rem; }

  .hero-headline {
    font-size: 4.25rem;
  }
}

/* Mobile breakpoint: max-width 767px */
@media (max-width: 767px) {
  .hero {
    min-height: auto;
    padding-top: calc(64px + var(--space-6));
    padding-bottom: var(--space-10);
  }

  .hero-inner {
    flex-direction: column;
    gap: var(--space-8);
    text-align: center;
  }

  .hero-content {
    text-align: center;
    padding: 0 var(--space-2);
  }

  .hero-headline {
    font-size: 2rem;
    line-height: 1.15;
  }

  .hero-sub {
    font-size: 0.875rem;
  }

  .hero-summary {
    font-size: 0.9375rem;
    line-height: 1.65;
    padding: 0 var(--space-2);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: var(--space-3);
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-framework {
    max-width: 100%;
    text-align: center;
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
    font-size: 0.875rem;
  }

  .hero-framework-tail {
    white-space: normal;
  }

  .hero-socials {
    justify-content: center;
  }

  .hero-photo-wrapper {
    order: -1;
  }

  .hero-photo {
    width: 180px;
    height: 180px;
  }

  .hero-photo-glow {
    inset: -30px;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .hero-headline {
    font-size: 1.75rem;
  }

  .hero-photo {
    width: 160px;
    height: 160px;
  }

  .chatbot-window {
    width: calc(100vw - 32px);
    right: -8px;
    bottom: 65px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .reveal-child {
    opacity: 1;
    transform: none;
  }

  .hero-photo {
    animation: none;
  }
}

/* ============================================
   10. PROJECT PAGE OVERRIDES
   ============================================ */
.project-page-hero {
  padding: calc(64px + var(--space-12)) 0 var(--space-12);
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Glow on project hero too */
.project-page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 40%, rgba(79, 70, 229, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.project-page-hero .hero-label {
  margin-bottom: var(--space-4);
}

.project-page-hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
  position: relative;
}

.project-page-hero .project-tagline {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--space-6);
  position: relative;
}

.project-page-hero .project-actions {
  justify-content: center;
  position: relative;
}

.project-metrics-bar {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
  padding: var(--space-6) 0;
  margin-bottom: var(--space-12);
}

.metrics-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
}

.metric-tile {
  text-align: center;
  min-width: 100px;
}

.metric-tile-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-tile-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-1);
  display: block;
}

.project-content {
  padding-bottom: var(--space-16);
}

.project-content h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
  margin-top: var(--space-10);
}

.project-content h2:first-child {
  margin-top: 0;
}

.project-content p {
  font-size: 0.9375rem;
  line-height: 1.8;
}

.project-content ul,
.project-content ol {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.project-content li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.7;
}

.project-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.project-content ol {
  counter-reset: step;
  padding-left: 0;
}

.project-content ol li {
  counter-increment: step;
  padding-left: var(--space-8);
}

.project-content ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-subtle);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.project-back {
  padding: var(--space-12) 0;
  text-align: center;
}

/* Arch diagram */
.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  margin: var(--space-6) 0;
}

.arch-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  width: 100%;
  max-width: 280px;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.arch-box:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transform: translateY(-2px);
}

.arch-box-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.arch-box-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.arch-arrow {
  font-size: 1.5rem;
  color: var(--accent);
  transform: rotate(90deg);
}

/* Algo grid */
.algo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.algo-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}

.algo-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 12px rgba(79, 70, 229, 0.08);
}

.algo-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
}

.algo-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.algo-type {
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.algo-type.supervised {
  color: var(--accent);
  background: var(--accent-subtle);
}

.algo-type.unsupervised {
  color: var(--success);
  background: var(--success-subtle);
}

.algo-impl {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Deep dive grid */
.deepdive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin: var(--space-6) 0;
}

.deepdive-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.deepdive-item:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md);
}

.deepdive-item h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-3);
}

.deepdive-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

/* Code examples grid */
.code-examples-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

/* Project page nav */
.project-nav .nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

/* Project-page responsive */
@media (min-width: 640px) {
  .algo-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .code-examples-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .project-page-hero h1 { font-size: 3rem; }

  .arch-diagram {
    flex-direction: row;
  }

  .arch-arrow {
    transform: none;
  }

  .deepdive-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .algo-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .project-page-hero h1 { font-size: 3.5rem; }
}