/* ============================================================
   UNIFIED PORTFOLIO STYLESHEET
   Dark Mode (default) + Light Mode (glassmorphism)
   Covers: index, projects, resume, contact
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ============================================================
   1. CSS CUSTOM PROPERTIES (THEME TOKENS)
   ============================================================ */
:root {
  /* ---- Dark Mode (default) ---- */
  --color-bg: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a2e;
  --color-accent: #00d4ff;
  --color-accent-dim: rgba(0, 212, 255, 0.15);
  --color-accent-glow: rgba(0, 212, 255, 0.4);
  --color-text: #e0e0e6;
  --color-text-muted: #8888a0;
  --color-text-bright: #ffffff;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-glass: rgba(10, 10, 15, 0.75);

  /* ---- Fonts ---- */
  --font-heading: 'JetBrains Mono', monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* ---- Sizing ---- */
  --max-width: 1200px;
  --nav-height: 70px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 50px;

  /* ---- Shadows (dark) ---- */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 8px 40px rgba(0, 212, 255, 0.15);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);

  /* ---- Transitions ---- */
  --transition-theme: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ---- Light Mode Overrides ---- */
body.light-mode {
  --color-bg: #f0f2f5;
  --color-bg-secondary: rgba(255, 255, 255, 0.6);
  --color-bg-tertiary: rgba(255, 255, 255, 0.4);
  --color-accent: #0099cc;
  --color-accent-dim: rgba(0, 153, 204, 0.1);
  --color-accent-glow: rgba(0, 153, 204, 0.2);
  --color-text: #2d3748;
  --color-text-muted: #718096;
  --color-text-bright: #1a202c;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-glass: rgba(255, 255, 255, 0.7);

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow: none;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  transition: var(--transition-theme);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text-bright);
  line-height: 1.2;
  font-weight: 700;
  transition: color 0.3s ease;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.3s ease, opacity 0.3s ease;
}

a:hover {
  opacity: 0.85;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ============================================================
   3. NAVIGATION (.navbar)
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--color-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-theme), backdrop-filter 0.3s ease;
}

.navbar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.navbar__logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: color 0.3s ease;
}

.navbar__logo::after {
  content: '_';
  animation: blink-cursor 1s step-end infinite;
  color: var(--color-accent);
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Nav Links */
.navbar__links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.navbar__links a {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.3s ease;
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--color-accent);
  opacity: 1;
}

.navbar__links a:hover::after,
.navbar__links a.active::after {
  width: 100%;
}

/* Mobile Toggle */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1010;
}

.navbar__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
}

.navbar__toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.navbar__toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   4. THEME TOGGLE (.theme-toggle)
   ============================================================ */
.theme-toggle {
  display: flex;
  align-items: center;
  margin-left: 1.5rem;
}

.theme-toggle button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition-theme), transform 0.3s ease;
}

.theme-toggle button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: rotate(15deg) scale(1.05);
}

/* Sun icon visible in dark mode, moon icon visible in light mode */
.theme-toggle .icon-sun {
  display: inline;
}

.theme-toggle .icon-moon {
  display: none;
}

body.light-mode .theme-toggle .icon-sun {
  display: none;
}

body.light-mode .theme-toggle .icon-moon {
  display: inline;
}

/* ============================================================
   5. HERO SECTION (.hero) - index.html
   ============================================================ */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero__gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 100, 200, 0.04) 0%, transparent 50%);
  pointer-events: none;
  transition: background 0.3s ease;
}

body.light-mode .hero__gradient {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0, 153, 204, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 153, 204, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 100, 200, 0.03) 0%, transparent 50%);
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  max-width: 800px;
}

/* Hero Label / Pill Badge */
.hero__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-accent-dim);
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  transition: var(--transition-theme);
}

/* Hero Title */
.hero__title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: -2px;
  margin-bottom: 1rem;
  color: var(--color-text-bright);
}

/* Glitch Text */
.glitch-text {
  position: relative;
  display: inline-block;
}

.glitch-text::before,
.glitch-text::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.glitch-text::before {
  color: #00b8d4;
  animation: glitch-top 3s infinite linear alternate-reverse;
  clip-path: inset(0 0 65% 0);
  opacity: 0.4;
}

.glitch-text::after {
  color: #00e5ff;
  animation: glitch-bottom 2.5s infinite linear alternate-reverse;
  clip-path: inset(60% 0 0 0);
  opacity: 0.4;
}

body.light-mode .glitch-text::before {
  color: #007899;
  opacity: 0.25;
}

body.light-mode .glitch-text::after {
  color: #0099cc;
  opacity: 0.25;
}

@keyframes glitch-top {
  0%   { transform: translate(0); }
  20%  { transform: translate(-2px, 2px); }
  40%  { transform: translate(2px, -1px); }
  60%  { transform: translate(-1px, 1px); }
  80%  { transform: translate(1px, -2px); }
  100% { transform: translate(0); }
}

@keyframes glitch-bottom {
  0%   { transform: translate(0); }
  20%  { transform: translate(2px, -2px); }
  40%  { transform: translate(-1px, 1px); }
  60%  { transform: translate(1px, -1px); }
  80%  { transform: translate(-2px, 2px); }
  100% { transform: translate(0); }
}

/* Hero Subtitle */
.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  font-weight: 400;
  transition: color 0.3s ease;
}

.hero__tagline {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  font-weight: 300;
  transition: color 0.3s ease;
}

/* Hero CTA */
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2.2rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  background: transparent;
  cursor: pointer;
  transition: var(--transition-theme), transform 0.3s ease;
}

.hero__cta:hover {
  background: var(--color-accent-dim);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  opacity: 1;
}

body.light-mode .hero__cta:hover {
  background: var(--color-accent-dim);
  box-shadow: 0 4px 20px rgba(0, 153, 204, 0.15);
}

/* Scroll Indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-family: var(--font-heading);
  animation: scroll-bounce 2s infinite;
  transition: color 0.3s ease;
}

.hero__scroll-indicator::after {
  content: '';
  width: 1px;
  height: 30px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   6. SECTION SHARED (.section)
   ============================================================ */
.section {
  padding: 6rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  transition: var(--transition-theme);
}

.section__header {
  text-align: center;
  margin-bottom: 4rem;
}

.section__label {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.section__divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: 0 auto;
  border-radius: 2px;
  transition: background-color 0.3s ease;
}

/* ============================================================
   7. ABOUT SECTION (.about)
   ============================================================ */
.about {
  background: var(--color-bg-secondary);
  transition: var(--transition-theme);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about__text {
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.8;
  transition: color 0.3s ease;
}

.about__text p {
  margin-bottom: 1.25rem;
}

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}

.stat-card {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition-theme), transform 0.3s ease;
}

body.light-mode .stat-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent-dim);
}

.stat-card__number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
  transition: color 0.3s ease;
}

.stat-card__label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 0.25rem;
  transition: color 0.3s ease;
}

/* About Visual (rotating rings) */
.about__visual {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about__visual .ring {
  position: absolute;
  border: 1px solid var(--color-accent-dim);
  border-radius: 50%;
  transition: border-color 0.3s ease;
}

.about__visual .ring:nth-child(1) {
  width: 80%;
  height: 80%;
  animation: rotate-slow 20s linear infinite;
}

.about__visual .ring:nth-child(2) {
  width: 60%;
  height: 60%;
  animation: rotate-slow 15s linear infinite reverse;
}

.about__visual .ring:nth-child(3) {
  width: 40%;
  height: 40%;
  animation: rotate-slow 10s linear infinite;
}

@keyframes rotate-slow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ============================================================
   8. SKILLS SECTION (.skills)
   ============================================================ */
.skills__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.skill-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: var(--transition-theme), transform 0.3s ease;
  position: relative;
  overflow: hidden;
}

body.light-mode .skill-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-dim);
  box-shadow: var(--shadow-card-hover);
}

.skill-card__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
  transition: transform 0.3s ease;
}

.skill-card:hover .skill-card__icon {
  transform: scale(1.1);
}

.skill-card__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-bright);
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.skill-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  transition: color 0.3s ease;
}

.skill-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 1rem;
}

.skill-card__tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-family: var(--font-heading);
  transition: var(--transition-theme);
}

/* ============================================================
   9. PAGE HEADER (.page-header) - projects, resume, contact
   ============================================================ */
.page-header {
  padding-top: 120px;
  padding-bottom: 3rem;
  text-align: center;
  background: var(--color-bg);
  transition: var(--transition-theme);
}

.page-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: -1px;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
  transition: color 0.3s ease;
}

.page-header .underline,
.page-header .animated-underline {
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: 1.25rem auto 0;
  border-radius: 2px;
  transition: background-color 0.3s ease;
}

.page-header .animated-underline {
  width: 0;
  animation: underline-grow 0.8s ease forwards 0.3s;
}

@keyframes underline-grow {
  to { width: 80px; }
}

/* ============================================================
   10. PROJECTS GRID (.projects-grid, .project-card)
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem;
}

.project-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition-theme), transform 0.3s ease;
  display: flex;
  flex-direction: column;
}

body.light-mode .project-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent-dim);
}

.project-card__image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
  transition: border-color 0.3s ease;
}

.project-card__body {
  padding: 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.project-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
  transition: color 0.3s ease;
}

.card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--font-heading);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent-dim);
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  transition: var(--transition-theme);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.tech-tags span {
  font-size: 0.7rem;
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-heading);
  transition: var(--transition-theme);
}

.project-card__links {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
}

.project-card__links a {
  font-size: 0.8rem;
  font-family: var(--font-heading);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color 0.3s ease, opacity 0.3s ease;
}

.project-card__links a:hover {
  opacity: 0.8;
}

/* ============================================================
   11. TIMELINE (.timeline-section) - resume page
   ============================================================ */
.timeline-section {
  padding: 4rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.timeline-section__title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.timeline {
  position: relative;
  padding: 2rem 0;
}

/* Center line */
.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--color-accent), transparent);
  transition: background 0.3s ease;
}

body.light-mode .timeline::before {
  background: linear-gradient(to bottom, transparent, var(--color-accent), transparent);
  opacity: 0.5;
}

.timeline-entry {
  position: relative;
  width: 50%;
  padding: 1.5rem 3rem;
}

.timeline-entry:nth-child(odd) {
  left: 0;
  text-align: right;
  padding-right: 3rem;
  padding-left: 0;
}

.timeline-entry:nth-child(even) {
  left: 50%;
  text-align: left;
  padding-left: 3rem;
  padding-right: 0;
}

/* Timeline Dot */
.timeline-dot {
  position: absolute;
  top: 2rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  z-index: 1;
  transition: var(--transition-theme);
}

.timeline-entry:nth-child(odd) .timeline-dot {
  right: -7px;
}

.timeline-entry:nth-child(even) .timeline-dot {
  left: -7px;
}

body.light-mode .timeline-dot {
  background: var(--color-accent);
}

/* Dark mode glow on dot */
.timeline-dot::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-accent-glow);
  z-index: -1;
  transition: background 0.3s ease;
}

body.light-mode .timeline-dot::after {
  background: transparent;
}

.timeline-date {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.timeline-content {
  margin-bottom: 0.25rem;
}

.timeline-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition-theme), transform 0.3s ease;
}

body.light-mode .timeline-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.timeline-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent-dim);
}

.timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.timeline-card h4 {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
}

.timeline-card p,
.timeline-card li {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  transition: color 0.3s ease;
}

.timeline-card ul {
  padding-left: 1rem;
  list-style: disc;
}

.timeline-card ul li {
  margin-bottom: 0.3rem;
}

/* ============================================================
   12. CERTIFICATIONS (.certifications-section)
   ============================================================ */
.certifications-section {
  padding: 4rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.certifications-section h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cert-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-align: center;
  transition: var(--transition-theme), transform 0.3s ease;
}

body.light-mode .cert-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.cert-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent-dim);
  box-shadow: var(--shadow-card-hover);
}

.cert-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  display: block;
}

.cert-card h3 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.cert-card p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  transition: color 0.3s ease;
}

.cert-card .cert-date {
  font-size: 0.7rem;
  color: var(--color-accent);
  font-family: var(--font-heading);
  margin-top: 0.5rem;
  letter-spacing: 0.5px;
  transition: color 0.3s ease;
}

/* ============================================================
   13. EDUCATION (.education-section)
   ============================================================ */
.education-section {
  padding: 4rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.education-section h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.education-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  max-width: 700px;
  margin: 0 auto 1.5rem;
  transition: var(--transition-theme), transform 0.3s ease;
}

body.light-mode .education-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.education-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent-dim);
}

.edu-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.education-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.education-card h4 {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.education-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  transition: color 0.3s ease;
}

/* ============================================================
   14. CONTACT (.contact-section)
   ============================================================ */
.contact-section {
  padding: 4rem 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.contact-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
  transition: var(--transition-theme), transform 0.3s ease;
}

body.light-mode .contact-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.contact-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent-dim);
  box-shadow: var(--shadow-card-hover);
}

.icon-circle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
  transition: var(--transition-theme);
}

.contact-card h3 {
  font-size: 1rem;
  margin-bottom: 0.15rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.contact-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color 0.3s ease;
}

.contact-card a {
  color: var(--color-accent);
}

/* Contact Form (optional) */
.contact-form {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  margin-top: 2rem;
  transition: var(--transition-theme);
}

body.light-mode .contact-form {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.contact-form label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  transition: var(--transition-theme);
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-form button[type="submit"] {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  cursor: pointer;
  transition: var(--transition-theme), transform 0.3s ease;
}

.contact-form button[type="submit"]:hover {
  background: var(--color-accent-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

body.light-mode .contact-form button[type="submit"]:hover {
  box-shadow: 0 4px 16px rgba(0, 153, 204, 0.15);
}

/* ============================================================
   15. SOCIAL LINKS (.social-section)
   ============================================================ */
.social-section {
  padding: 4rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.social-section h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: 2rem;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

.social-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  max-width: 800px;
  margin: 0 auto;
}

.social-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: var(--color-text);
  transition: var(--transition-theme), transform 0.3s ease;
}

body.light-mode .social-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.social-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent-dim);
  box-shadow: var(--shadow-card-hover);
  opacity: 1;
}

.social-icon {
  font-size: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-accent-dim);
  flex-shrink: 0;
  transition: var(--transition-theme);
}

.social-card span {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-bright);
  transition: color 0.3s ease;
}

/* ============================================================
   16. FOOTER (.footer)
   ============================================================ */
.footer,
.site-footer,
.resume-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  padding: 3rem 2rem;
  transition: var(--transition-theme);
}

body.light-mode .footer,
body.light-mode .site-footer,
body.light-mode .resume-footer {
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-heading);
  transition: color 0.3s ease;
}

.footer__socials {
  display: flex;
  gap: 1rem;
}

.footer__socials a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 1rem;
  transition: var(--transition-theme), transform 0.3s ease;
}

.footer__socials a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  opacity: 1;
}

/* ============================================================
   17. SCROLL ANIMATIONS ([data-animate])
   ============================================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Variants */
[data-animate="fade-up"] {
  transform: translateY(30px);
}

[data-animate="fade-left"] {
  transform: translateX(-30px);
}

[data-animate="fade-left"].is-visible {
  transform: translateX(0);
}

[data-animate="fade-right"] {
  transform: translateX(30px);
}

[data-animate="fade-right"].is-visible {
  transform: translateX(0);
}

[data-animate="scale-in"] {
  transform: scale(0.9);
}

[data-animate="scale-in"].is-visible {
  transform: scale(1);
}

/* ============================================================
   18. UTILITY CLASSES
   ============================================================ */
.tilt-card {
  will-change: transform;
}

.text-accent {
  color: var(--color-accent);
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

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

/* ============================================================
   19. RESPONSIVE BREAKPOINTS
   ============================================================ */

/* ---------- 968px ---------- */
@media (max-width: 968px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about__visual {
    max-width: 350px;
    margin: 0 auto;
  }

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

/* ---------- 768px ---------- */
@media (max-width: 768px) {
  /* Timeline collapses to left-aligned */
  .timeline::before {
    left: 20px;
  }

  .timeline-entry {
    width: 100%;
    left: 0 !important;
    text-align: left !important;
    padding-left: 50px !important;
    padding-right: 0 !important;
  }

  .timeline-entry .timeline-dot {
    left: 13px !important;
    right: auto !important;
  }

  /* Projects */
  .projects-grid {
    grid-template-columns: 1fr;
  }

  /* Certs */
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Section spacing */
  .section {
    padding: 4rem 1.5rem;
  }

  .page-header {
    padding-top: 100px;
    padding-bottom: 2rem;
  }
}

/* ---------- 640px ---------- */
@media (max-width: 640px) {
  /* Mobile Navigation */
  .navbar__toggle {
    display: flex;
  }

  .navbar__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    flex-direction: column;
    background: var(--color-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .navbar__links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .theme-toggle {
    margin-left: 0;
  }

  /* Skills */
  .skills__grid {
    grid-template-columns: 1fr;
  }

  /* Stats */
  .about__stats {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .stat-card {
    padding: 1rem;
  }

  .stat-card__number {
    font-size: 1.5rem;
  }

  /* Section */
  .section {
    padding: 3rem 1rem;
  }

  .section__title {
    font-size: 1.6rem;
  }

  /* Hero */
  .hero__title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  /* Contact */
  .contact-card {
    flex-direction: column;
    text-align: center;
    padding: 2rem 1.5rem;
  }

  /* Education */
  .education-card {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  /* Social grid */
  .social-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 480px ---------- */
@media (max-width: 480px) {
  .cert-grid {
    grid-template-columns: 1fr;
  }

  .about__stats {
    grid-template-columns: 1fr;
  }

  .hero__content {
    padding: 1rem;
  }

  .projects-grid {
    padding: 1rem;
  }
}

/* ============================================================
   20. PRINT STYLES
   ============================================================ */
@media print {
  .navbar,
  .hero__canvas,
  .hero__gradient,
  .hero__scroll-indicator,
  .theme-toggle,
  .footer__socials {
    display: none !important;
  }

  body {
    background: #fff !important;
    color: #000 !important;
  }

  .page-header {
    padding-top: 2rem !important;
  }
}