/* ==========================================================================
   CSS Custom Properties — Change these to instantly re-theme the portfolio.
   ========================================================================== */

:root {
  /* ── Fonts ──────────────────────────────────────────────────────────── */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* ── Spacing ────────────────────────────────────────────────────────── */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

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

  /* ── Transitions ────────────────────────────────────────────────────── */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ── Dark Theme (default) ─────────────────────────────────────────────── */
[data-theme="dark"] {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --bg-nav: rgba(10, 10, 15, 0.85);

  --text-primary: #e8e8ed;
  --text-secondary: #9898a6;
  --text-muted: #5a5a6e;

  --accent: #6c63ff;
  --accent-hover: #7b73ff;
  --accent-glow: rgba(108, 99, 255, 0.25);
  --accent-subtle: rgba(108, 99, 255, 0.1);
  --accent-secondary: #00d4aa;

  --border-color: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --gradient-primary: linear-gradient(135deg, #6c63ff 0%, #00d4aa 100%);
  --gradient-card: linear-gradient(135deg, rgba(108, 99, 255, 0.08) 0%, rgba(0, 212, 170, 0.04) 100%);
  --gradient-hero: radial-gradient(ellipse at 20% 50%, rgba(108, 99, 255, 0.15) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 20%, rgba(0, 212, 170, 0.1) 0%, transparent 50%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(108, 99, 255, 0.15);

  --particle-color: rgba(108, 99, 255, 0.5);
  --scrollbar-track: #12121a;
  --scrollbar-thumb: #2a2a3a;
}

/* ── Light Theme ──────────────────────────────────────────────────────── */
[data-theme="light"] {
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-card: rgba(0, 0, 0, 0.02);
  --bg-card-hover: rgba(0, 0, 0, 0.04);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-nav: rgba(250, 250, 250, 0.9);

  --text-primary: #1a1a2e;
  --text-secondary: #555570;
  --text-muted: #8888a0;

  --accent: #5a4fcf;
  --accent-hover: #4a3fbf;
  --accent-glow: rgba(90, 79, 207, 0.2);
  --accent-subtle: rgba(90, 79, 207, 0.08);
  --accent-secondary: #00a884;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  --gradient-primary: linear-gradient(135deg, #5a4fcf 0%, #00a884 100%);
  --gradient-card: linear-gradient(135deg, rgba(90, 79, 207, 0.06) 0%, rgba(0, 168, 132, 0.03) 100%);
  --gradient-hero: radial-gradient(ellipse at 20% 50%, rgba(90, 79, 207, 0.08) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 20%, rgba(0, 168, 132, 0.06) 0%, transparent 50%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 40px rgba(90, 79, 207, 0.08);

  --particle-color: rgba(90, 79, 207, 0.3);
  --scrollbar-track: #f0f0f0;
  --scrollbar-thumb: #c0c0d0;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

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

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-hover); }

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

/* ==========================================================================
   Navigation
   ========================================================================== */

#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

#main-nav.nav--scrolled {
  height: 60px;
  box-shadow: var(--shadow-sm);
}

.nav__brand {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}
.nav__brand:hover { color: var(--accent); }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
  transition: width var(--transition-base);
}
.nav__link:hover,
.nav__link--active {
  color: var(--text-primary);
}
.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.theme-toggle {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-pill);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  margin-left: var(--space-md);
}
.theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  z-index: 1001;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

@media (max-width: 768px) {
  .nav__hamburger { display: flex; }
  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    padding: var(--space-2xl) var(--space-lg);
    gap: var(--space-xl);
    transition: right var(--transition-base);
    box-shadow: var(--shadow-lg);
  }
  .nav--open .nav__links {
    right: 0;
  }
  .nav__link { font-size: 1.1rem; }
  .theme-toggle { margin-left: 0; }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-2xl)) var(--space-lg) var(--space-2xl);
  background: var(--gradient-hero);
  overflow: hidden;
}

#particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  cursor: default;
}

.hero__content {
  position: relative;
  z-index: 2;
  pointer-events: none;
}

.hero__content a,
.hero__content button,
.hero__content .resume-dropdown__menu {
  pointer-events: auto;
  text-align: center;
  max-width: 800px;
}

.hero__greeting {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.hero__name {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__title-line {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  margin-bottom: var(--space-lg);
}

.hero__title {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.hero__cursor {
  display: inline-block;
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 300;
  color: var(--accent);
  animation: blink 0.8s infinite;
  margin-left: 2px;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero__tagline {
  font-size: clamp(0.95rem, 1.5vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

.hero__ctas {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.hero__scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.8rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.hero__scroll-arrow {
  font-size: 1.2rem;
  animation: float 2s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* Hero entrance animation */
.animate-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.7s ease forwards;
}

@keyframes fadeInUp {
  to { opacity: 1; transform: translateY(0); }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.8rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--border-radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  letter-spacing: 0.3px;
}

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ==========================================================================
   Resume Dropdown
   ========================================================================== */

.resume-dropdown {
  position: relative;
  display: inline-block;
  z-index: 10;
}

.resume-dropdown__trigger {
  font-family: inherit;
}

.resume-dropdown__arrow {
  font-size: 0.7em;
  margin-left: 0.25em;
  transition: transform var(--transition-fast);
}

.resume-dropdown__trigger[aria-expanded="true"] .resume-dropdown__arrow {
  transform: rotate(180deg);
}

.resume-dropdown__menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  min-width: 260px;
  list-style: none;
  margin: 0;
  padding: var(--space-xs) 0;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 1000;
}

[data-theme="dark"] .resume-dropdown__menu {
  background: #1a1a26;
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .resume-dropdown__menu {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.12);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
}

.resume-dropdown__menu--open {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.resume-dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.65rem 1.2rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.resume-dropdown__item:hover,
.resume-dropdown__item:focus {
  background: var(--accent-subtle);
  color: var(--accent);
  outline: none;
}

.resume-dropdown__item svg {
  flex-shrink: 0;
  opacity: 0.6;
}

.resume-dropdown__item:hover svg,
.resume-dropdown__item:focus svg {
  opacity: 1;
}

/* Mobile: ensure touch-friendly sizing */
@media (max-width: 768px) {
  .resume-dropdown__menu {
    min-width: 240px;
  }
  .resume-dropdown__item {
    padding: 0.85rem 1.2rem;
    font-size: 0.92rem;
  }
}

/* ==========================================================================
   Section Shared Styles
   ========================================================================== */

section {
  padding: var(--space-3xl) 0;
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section__divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
  margin: 0 auto var(--space-2xl);
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about__grid {
  display: grid;
  gap: var(--space-xl);
}

.about__text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

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

.about__highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
}

.about__highlight-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
}
.about__highlight-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.about__highlight-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.about__highlight-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.about__extras {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.about__extras h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--accent-subtle);
}

.about__edu-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}
.about__edu-item strong {
  color: var(--text-primary);
  font-size: 0.95rem;
}
.about__edu-degree {
  color: var(--text-secondary);
  font-size: 0.85rem;
}
.about__edu-period {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.about__awards ul {
  list-style: none;
}
.about__awards li {
  position: relative;
  padding-left: var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}
.about__awards li::before {
  content: '★';
  position: absolute;
  left: 0;
  color: var(--accent);
}

@media (max-width: 640px) {
  .about__extras {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Skills Section
   ========================================================================== */

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.skills__card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.skills__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.skills__card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.skills__card:hover::before {
  opacity: 1;
}

.skills__card-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.skills__card-icon {
  font-size: 1.6rem;
}

.skills__card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.skills__pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skills__pill {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--accent-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-pill);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.skills__pill:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* ==========================================================================
   Experience Timeline
   ========================================================================== */

.timeline {
  position: relative;
  padding: var(--space-lg) 0;
}

/* Center line */
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
  transform: translateX(-50%);
}

.timeline__item {
  position: relative;
  display: flex;
  justify-content: flex-end;
  width: 50%;
  padding-right: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.timeline__item--right {
  justify-content: flex-start;
  margin-left: 50%;
  padding-right: 0;
  padding-left: var(--space-xl);
}

.timeline__dot {
  position: absolute;
  right: -8px;
  top: var(--space-lg);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
  z-index: 1;
}

.timeline__item--right .timeline__dot {
  left: -8px;
  right: auto;
}

.timeline__card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  width: 100%;
}
.timeline__card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}

.timeline__company {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline__period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  white-space: nowrap;
  padding: 0.2rem 0.6rem;
  background: var(--accent-subtle);
  border-radius: var(--border-radius-sm);
}

.timeline__role {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.timeline__location {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.timeline__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.timeline__tech-tag {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: var(--border-radius-pill);
  border: 1px solid transparent;
}

.timeline__highlights {
  list-style: none;
}
.timeline__highlights li {
  position: relative;
  padding-left: var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
  line-height: 1.6;
}
.timeline__highlights li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* Mobile timeline — single column */
@media (max-width: 900px) {
  .timeline::before { left: 20px; }
  .timeline__item,
  .timeline__item--right {
    width: 100%;
    margin-left: 0;
    padding-left: calc(20px + var(--space-xl));
    padding-right: 0;
    justify-content: flex-start;
  }
  .timeline__dot,
  .timeline__item--right .timeline__dot {
    left: 12px;
    right: auto;
  }
}

/* ==========================================================================
   Projects Section
   ========================================================================== */

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.projects__card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}
.projects__card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.projects__card--featured {
  background: var(--gradient-card);
  border-color: var(--accent-subtle);
}
.projects__card--featured:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

.projects__featured-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 0.2rem 0.7rem;
  border-radius: var(--border-radius-pill);
  margin-bottom: var(--space-md);
  width: fit-content;
}

.projects__title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.projects__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.projects__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.projects__tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: var(--border-radius-pill);
}

.projects__links {
  display: flex;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
}

.projects__link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.projects__link:hover {
  color: var(--accent);
}

.projects__link--demo {
  color: var(--accent);
}

@media (max-width: 400px) {
  .projects__grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Blog Section
   ========================================================================== */

.blog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.blog__card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  text-decoration: none;
  transition: all var(--transition-base);
}
.blog__card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.blog__date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.blog__title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  transition: color var(--transition-fast);
}
.blog__card:hover .blog__title { color: var(--accent); }

.blog__excerpt {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.blog__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.blog__tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  background: var(--accent-subtle);
  color: var(--accent);
  border-radius: var(--border-radius-pill);
}

.blog__read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.blog__empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
}

.blog__cta {
  text-align: center;
  margin-top: var(--space-xl);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact__text {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.contact__email {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-xl);
  padding: var(--space-md) var(--space-lg);
  background: var(--accent-subtle);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}
.contact__email:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
  color: var(--accent-hover);
}

.contact__socials {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.contact__social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-pill);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}
.contact__social-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* Contact form */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form__label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.form__input,
.form__textarea {
  width: 100%;
  padding: 0.85rem var(--space-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  outline: none;
}
.form__input:focus,
.form__textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--text-muted);
}

.form__textarea { resize: vertical; min-height: 120px; }

.contact__submit {
  align-self: flex-start;
}

.contact__form-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 1.5em;
}

@media (max-width: 768px) {
  .contact__grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */

#main-footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer__inner p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer__links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}
.footer__links a:hover { color: var(--accent); }

/* ==========================================================================
   Scroll Reveal Animations
   ========================================================================== */

.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger children */
.skills__grid .scroll-reveal:nth-child(2) { transition-delay: 0.1s; }
.skills__grid .scroll-reveal:nth-child(3) { transition-delay: 0.2s; }
.skills__grid .scroll-reveal:nth-child(4) { transition-delay: 0.3s; }
.skills__grid .scroll-reveal:nth-child(5) { transition-delay: 0.4s; }
.skills__grid .scroll-reveal:nth-child(6) { transition-delay: 0.5s; }

.projects__grid .scroll-reveal:nth-child(2) { transition-delay: 0.1s; }
.projects__grid .scroll-reveal:nth-child(3) { transition-delay: 0.15s; }
.projects__grid .scroll-reveal:nth-child(4) { transition-delay: 0.2s; }
.projects__grid .scroll-reveal:nth-child(5) { transition-delay: 0.25s; }
.projects__grid .scroll-reveal:nth-child(6) { transition-delay: 0.3s; }

/* ==========================================================================
   Utility: Alternating section backgrounds
   ========================================================================== */

#about, #projects, #contact {
  background-color: var(--bg-secondary);
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  #main-nav, #particles, .hero__scroll-hint, .theme-toggle, .nav__hamburger, .chat-fab, .chat-panel { display: none !important; }
  body { font-size: 12pt; color: #000; background: #fff; }
  section { padding: 1rem 0; break-inside: avoid; }
}

/* ==========================================================================
   Chatbot Widget
   ========================================================================== */

.chat-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1100;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: var(--gradient-primary);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.chat-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.chat-fab__icon {
  width: 24px;
  height: 24px;
  position: absolute;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.chat-fab__icon--close {
  opacity: 0;
  transform: rotate(-90deg);
}
.chat-fab--open .chat-fab__icon--chat {
  opacity: 0;
  transform: rotate(90deg);
}
.chat-fab--open .chat-fab__icon--close {
  opacity: 1;
  transform: rotate(0);
}

/* Panel */
.chat-panel {
  position: fixed;
  bottom: 92px;
  right: 24px;
  z-index: 1100;
  width: 380px;
  max-height: 520px;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px) scale(0.95);
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.chat-panel--open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

/* Header */
.chat-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.chat-panel__header-info {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat-panel__header-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-secondary);
  flex-shrink: 0;
}
.chat-panel__header-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}
.chat-panel__close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color var(--transition-fast);
}
.chat-panel__close:hover {
  color: var(--text-primary);
}

/* Messages */
.chat-panel__messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 280px;
  max-height: 340px;
}

.chat-msg {
  display: flex;
  max-width: 85%;
}
.chat-msg--user {
  align-self: flex-end;
}
.chat-msg--assistant {
  align-self: flex-start;
}

.chat-msg__bubble {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.88rem;
  line-height: 1.6;
  word-wrap: break-word;
}
.chat-msg--user .chat-msg__bubble {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.chat-msg--assistant .chat-msg__bubble {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
}

/* Typing indicator */
.chat-typing {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 18px !important;
}
.chat-typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: chatBounce 1.4s ease-in-out infinite;
}
.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes chatBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* Starter chips */
.chat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-left: 2px;
}
.chat-chip {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--border-radius-pill);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--accent);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}
.chat-chip:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

/* Footer / Input */
.chat-panel__footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}
.chat-panel__input-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
}
.chat-panel__input {
  flex: 1;
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}
.chat-panel__input:focus {
  border-color: var(--accent);
}
.chat-panel__input::placeholder {
  color: var(--text-muted);
}
.chat-panel__send {
  background: var(--gradient-primary);
  border: none;
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}
.chat-panel__send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.chat-panel__powered {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
}

/* Mobile */
@media (max-width: 480px) {
  .chat-panel {
    width: calc(100vw - 16px);
    right: 8px;
    bottom: 84px;
    max-height: calc(100vh - 120px);
  }
  .chat-fab {
    bottom: 16px;
    right: 16px;
  }
}