/* ============================================
   Sreeraj Dabbiru — Portfolio (Advanced)
   Dark theme · Glassmorphism · Modern typography · Animations
   ============================================ */

/* CSS Variables */
:root {
  --bg-primary: #07070b;
  --bg-secondary: #0c0c12;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.07);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  
  --text-primary: #f5f5f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Primary accent: indigo → violet */
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.35);
  --accent-soft: rgba(99, 102, 241, 0.12);
  
  /* Secondary: cyan/teal for variety */
  --accent-2: #06b6d4;
  --accent-2-soft: rgba(6, 182, 212, 0.15);
  
  --gradient-1: #6366f1;
  --gradient-2: #8b5cf6;
  --gradient-3: #a855f7;
  --gradient-text: linear-gradient(135deg, #e0e7ff 0%, #a5b4fc 45%, #c4b5fd 100%);
  --gradient-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.15));
  
  --section-padding: clamp(4rem, 12vw, 7rem);
  --container-max: 1140px;
  --nav-height: 72px;
  
  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --text-base: 1rem;
  --text-sm: 0.875rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: clamp(1.75rem, 4vw, 2.75rem);
  --text-hero: clamp(2.75rem, 7vw, 4.5rem);
  
  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration: 0.35s;
  --duration-slow: 0.6s;
  --duration-fast: 0.2s;
  
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
}

/* Skip to content (accessibility) */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  font-weight: 600;
  z-index: 1001;
  transform: translateY(-110%);
  transition: transform var(--duration) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ========== Animated background ========== */
.bg-gradient {
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 90% 55% at 50% -25%, rgba(37, 99, 235, 0.15), transparent 55%),
    radial-gradient(ellipse 70% 45% at 100% 0%, rgba(56, 189, 248, 0.12), transparent 50%),
    radial-gradient(ellipse 55% 35% at 0% 60%, rgba(37, 99, 235, 0.08), transparent 45%);
  pointer-events: none;
  z-index: -3;
  animation: gradientShift 18s ease-in-out infinite alternate;
}

@keyframes gradientShift {
  0% { opacity: 1; transform: scale(1) rotate(0deg); }
  100% { opacity: 0.95; transform: scale(1.08) rotate(1deg); }
}

/* Subtle shared keyframes */
@keyframes softGlow {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.8; }
}

@keyframes subtleFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

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

@keyframes underlineReveal {
  from { width: 0; opacity: 0; }
  to { width: 48px; opacity: 1; }
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: -2;
  animation: gridDrift 60s linear infinite;
}

@keyframes gridDrift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(1px, 1px); }
}

/* Floating orbs */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: var(--accent);
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.orb-2 {
  width: 300px;
  height: 300px;
  background: var(--gradient-2);
  bottom: 20%;
  left: -80px;
  animation-delay: -7s;
}

.orb-3 {
  width: 250px;
  height: 250px;
  background: var(--gradient-3);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2rem);
}

/* ========== Navigation ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(8, 8, 12, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
}


.navbar.scrolled {
  background: rgba(8, 8, 12, 0.92);
  box-shadow: 0 8px 32px var(--glass-shadow);
  border-bottom-color: rgba(255,255,255,0.06);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2rem);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.03em;
  transition: color var(--duration) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.logo:hover {
  color: var(--accent-light);
  transform: scale(1.02);
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-links a {
  position: relative;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--duration) var(--ease-out);
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--gradient-2));
  border-radius: 2px;
  transition: width var(--duration) var(--ease-out);
}

.nav-links a {
  transition: color var(--duration) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.nav-links a:hover {
  color: var(--accent-light);
  transform: translateY(-1px);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

.nav-links a[aria-current="page"]::after {
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

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

/* ========== Glass card ========== */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: 
    background var(--duration) var(--ease-out),
    border-color var(--duration) var(--ease-out),
    box-shadow var(--duration) var(--ease-out),
    transform var(--duration) var(--ease-out);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 40px var(--glass-shadow), 0 0 0 1px rgba(255,255,255,0.04), 0 0 20px rgba(99, 102, 241, 0.06);
}

/* ========== Hero ========== */
.hero {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.5rem 1.5rem 4rem;
  position: relative;
}

@media (min-width: 1024px) {
  .hero-inner {
    display: grid;
    grid-template-columns: minmax(320px, 1fr) minmax(460px, 1fr);
    align-items: center;
    gap: 3.5rem;
    max-width: var(--container-max);
    margin: 0 auto;
  }

  .hero-left {
    display: flex;
    justify-content: center;
  }

  .hero-right {
    max-width: 520px;
  }

  .hero-photo-wrap {
    margin: 0;
    width: 100%;
    max-width: 340px;
    height: auto;
    border-radius: var(--radius-xl);
  }
}

.hero-content {
  max-width: 680px;
}

.hero-photo-wrap {
  position: relative;
  width: 280px;
  height: 280px;
  margin: 0 auto 1.75rem;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255,255,255,0.06);
  transition: transform var(--duration-slow) var(--ease-spring), box-shadow var(--duration-slow) var(--ease-out);
  animation: heroPhotoIn 1s var(--ease-out) both;
}

.hero-photo-wrap:hover {
  transform: scale(1.03);
  box-shadow: 0 12px 40px var(--glass-shadow), 0 0 24px var(--accent-glow);
}

@keyframes heroPhotoIn {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

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

.hero-photo-fallback {
  display: none;
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-soft), rgba(139, 92, 246, 0.2));
  color: var(--accent-light);
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 700;
  align-items: center;
  justify-content: center;
}

.hero-photo-fallback.visible {
  display: flex;
}

.hero-subtitle {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 0.6rem;
  animation: fadeInUp 0.9s var(--ease-out) forwards;
}

.hero-greeting-line {
  display: none;
}

.hero-title {
  margin-bottom: 0.5rem;
  animation: fadeInUp 0.9s var(--ease-out) 0.08s both;
}

.hero-name {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  display: inline-block;
  background: var(--gradient-text);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientText 6s ease-in-out infinite;
}

@keyframes gradientText {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

.hero-tagline {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 1rem;
  animation: fadeInUp 0.9s var(--ease-out) 0.16s both;
}

.hero-tagline-ai {
  color: var(--accent-light);
  font-weight: 600;
  background: linear-gradient(90deg, var(--accent-light), var(--gradient-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-intro {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.9s var(--ease-out) 0.24s both;
}

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

.hero-meta {
  display: block;
  margin-top: 0.75rem;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2rem;
  animation: fadeInUp 0.9s var(--ease-out) 0.32s both;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: transform var(--duration) var(--ease-spring), box-shadow var(--duration) var(--ease-out), color var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out), background var(--duration) var(--ease-out);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
  color: white;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 32px var(--accent-glow), 0 0 28px rgba(99, 102, 241, 0.25);
  transition: transform var(--duration) var(--ease-spring), box-shadow var(--duration) var(--ease-out);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-soft);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--accent-light);
}

/* Hero stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  font-size: var(--text-sm);
  color: var(--text-muted);
  animation: fadeInUp 0.9s var(--ease-out) 0.4s both;
}

.hero-stat {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-stat .stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--accent-light);
}

.hero-stat svg {
  width: 18px;
  height: 18px;
  color: var(--accent-light);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  animation: bounce 2.2s ease-in-out infinite;
  opacity: 0.85;
  transition: opacity var(--duration) var(--ease-out);
}

.scroll-indicator:hover {
  opacity: 1;
  color: var(--accent-light);
}

.scroll-indicator svg {
  width: 24px;
  height: 24px;
  animation: scrollChevronPulse 2s ease-in-out infinite;
}

@keyframes scrollChevronPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== Sections ========== */
.section {
  padding: var(--section-padding) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.section:nth-of-type(odd) {
  background: rgba(255, 255, 255, 0.03);
}

.section:nth-of-type(even) {
  background: rgba(0, 0, 0, 0);
}

.section-title {
  position: relative;
}

.section-title::before {
  content: '';
  position: absolute;
  left: -1.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background: linear-gradient(180deg, var(--accent), var(--gradient-2));
  border-radius: 999px;
  opacity: 0.8;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--gradient-2));
  border-radius: 4px;
  transition: width var(--duration-slow) var(--ease-out) 0.15s;
}

.section-title.revealed::after {
  width: 48px;
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 560px;
}

.section-subtitle a {
  color: var(--accent-light);
  text-decoration: none;
  font-weight: 500;
}

.section-subtitle a:hover {
  text-decoration: underline;
}

.subsection-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  margin-top: 2.5rem;
}

.subsection-title:first-of-type {
  margin-top: 0;
}

.subsection-title-ai {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-light);
  margin-bottom: 1rem;
}

.subsection-title-ai svg {
  width: 22px;
  height: 22px;
}

/* Reveal animation + stagger (delay set via JS from data-delay) */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ========== About ========== */
.about-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 768px) {
  .about-layout {
    grid-template-columns: 1fr;
  }
  .about-photo-wrap {
    max-width: 240px;
    margin: 0 auto;
  }
}

.about-photo-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  aspect-ratio: 4/5;
  background: var(--bg-card);
}

.about-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-photo-fallback {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--accent-soft);
  color: var(--accent-light);
  align-items: center;
  justify-content: center;
}

.about-photo-fallback.visible {
  display: flex;
}

.about-photo-fallback svg {
  width: 64px;
  height: 64px;
}

.about-text-block {
  min-width: 0;
}

.about-summary {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.25rem;
  max-width: none;
}

.about-summary-secondary {
  margin-bottom: 2rem;
}

.about-summary strong {
  color: var(--text-primary);
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.about-card {
  text-align: center;
}

.about-card-ai .card-icon {
  background: linear-gradient(135deg, var(--accent-soft), rgba(139, 92, 246, 0.2));
  color: var(--accent-light);
}

.about-card .card-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-md);
  color: var(--accent-light);
  transition: transform var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.about-card:hover .card-icon {
  transform: scale(1.05);
  box-shadow: 0 0 24px var(--accent-glow);
}

.about-card .card-icon svg {
  width: 24px;
  height: 24px;
}

.about-card h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.about-card ul {
  list-style: none;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.about-card li + li {
  margin-top: 0.3rem;
}

/* ========== Education ========== */
.education-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .education-layout {
    grid-template-columns: 1fr;
  }
  .education-photo-wrap {
    max-width: 320px;
    margin: 0 auto;
  }
}

.education-photo-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  aspect-ratio: 3/4;
  background: var(--bg-card);
}

.education-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.education-photo-fallback {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--accent-soft);
  color: var(--accent-light);
  align-items: center;
  justify-content: center;
}

.education-photo-fallback.visible {
  display: flex;
}

.education-photo-fallback svg {
  width: 56px;
  height: 56px;
}

.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .education-grid {
    grid-template-columns: 1fr;
  }
}

.education-card {
  padding: 1.75rem;
}

.education-card-minor {
  padding: 1.25rem;
}

.education-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-md);
  color: var(--accent-light);
  margin-bottom: 1rem;
}

.education-icon svg {
  width: 22px;
  height: 22px;
}

.education-card h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.education-school {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.education-meta {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ========== Projects ========== */
.projects-ai-highlight {
  margin-bottom: 2.5rem;
}

.project-card-hero {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 0;
  padding: 0;
  overflow: hidden;
  max-width: 900px;
}

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

.project-hero-image-wrap {
  position: relative;
  min-height: 200px;
  background: rgba(99, 102, 241, 0.08);
}

.project-hero-image {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
  display: block;
}

.project-hero-image-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  opacity: 0.5;
}

.project-hero-image-placeholder svg {
  width: 64px;
  height: 64px;
}

.project-hero-content {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
}

.project-badge-ai {
  background: linear-gradient(135deg, var(--accent-soft), rgba(139, 92, 246, 0.2));
  color: var(--accent-light);
}

.projects-featured {
  margin-bottom: 2rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.projects-grid-featured {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

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

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px var(--glass-shadow), 0 0 0 1px rgba(255,255,255,0.05), 0 0 48px var(--accent-glow);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.project-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.project-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.28rem 0.55rem;
  background: var(--accent-soft);
  color: var(--accent-light);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.project-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-tech span {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 0.25rem 0.55rem;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-sm);
}

.project-links {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--text-sm);
  color: var(--accent-light);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--duration) var(--ease-out), transform var(--duration) var(--ease-out);
}

.project-links a:hover {
  color: var(--accent);
  transform: translateX(2px);
}

.project-links a svg {
  width: 16px;
  height: 16px;
}

/* ========== Timeline (Achievements) ========== */
.timeline {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--gradient-2));
  border-radius: 2px;
  opacity: 0.5;
}

.timeline-item {
  position: relative;
  padding-left: 2.75rem;
  margin-bottom: 1.5rem;
}

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

.timeline-marker {
  position: absolute;
  left: 0;
  top: 1.5rem;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 16px var(--accent-glow);
  transition: transform var(--duration) var(--ease-spring), box-shadow var(--duration) var(--ease-out);
  animation: markerPulse 3s ease-in-out infinite;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 24px var(--accent-glow);
  animation: none;
}

@keyframes markerPulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--bg-primary), 0 0 16px var(--accent-glow); }
  50% { box-shadow: 0 0 0 4px var(--bg-primary), 0 0 22px rgba(99, 102, 241, 0.5); }
}

.timeline-content h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.timeline-content p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ========== Certifications ========== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.cert-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: transform var(--duration) var(--ease-out);
}

.cert-card:hover {
  transform: translateY(-4px);
}

.cert-card > i,
.cert-card > [data-lucide] {
  margin-bottom: 0.75rem;
}

.cert-card svg {
  width: 28px;
  height: 28px;
  color: var(--accent-light);
}

.cert-card h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.cert-card p {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ========== Skills ========== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.skills-grid-wide {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.skills-category-ai .skills-category-icon {
  background: linear-gradient(135deg, var(--accent-soft), rgba(139, 92, 246, 0.25));
  color: var(--accent-light);
}

.skills-category-ai:hover {
  box-shadow: 0 12px 40px var(--glass-shadow), 0 0 32px var(--accent-glow);
}

.skills-category {
  padding: 1.5rem;
}

.skills-category:hover {
  transform: translateY(-4px);
}

.skills-category-icon {
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-md);
  color: var(--accent-light);
  margin-bottom: 1rem;
  transition: transform var(--duration) var(--ease-out);
}

.skills-category:hover .skills-category-icon {
  transform: rotate(-5deg) scale(1.05);
}

.skills-category-icon svg {
  width: 22px;
  height: 22px;
}

.skills-category h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skills-tags span {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  transition: border-color var(--duration) var(--ease-out), color var(--duration) var(--ease-out), transform var(--duration) var(--ease-out);
}

.skills-category:hover .skills-tags span {
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--text-primary);
}

.skills-category .skills-tags span:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ========== Contact ========== */
.contact-subtitle {
  margin-bottom: 2rem;
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-base);
  transition: color var(--duration) var(--ease-out);
  padding: 0.5rem 0;
}

.contact-item:hover {
  color: var(--accent-light);
}

.contact-item-static {
  cursor: default;
}

.contact-item-static:hover {
  color: var(--text-secondary);
}

.contact-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--accent-light);
}

.contact-form {
  padding: 1.75rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  font-size: var(--text-base);
  font-family: inherit;
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), 0 0 20px rgba(99, 102, 241, 0.08);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.btn-full {
  width: 100%;
  justify-content: center;
  margin-top: 0.5rem;
}

/* ========== Footer ========== */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--glass-border);
}

/* Scroll to top */
.scroll-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.75rem;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(8, 8, 12, 0.72);
  color: var(--text-primary);
  display: grid;
  place-items: center;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--duration) var(--ease-out), transform var(--duration) var(--ease-out), visibility var(--duration) var(--ease-out);
  z-index: 1002;
  cursor: pointer;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background: rgba(8, 8, 12, 0.9);
  transform: translateY(-2px);
}

.scroll-to-top svg {
  width: 18px;
  height: 18px;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-text {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  color: var(--text-muted);
  transition: color var(--duration) var(--ease-out), transform var(--duration) var(--ease-out);
}

.footer-social a:hover {
  color: var(--accent-light);
  transform: translateY(-2px);
}

.footer-social svg {
  width: 20px;
  height: 20px;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(8, 8, 12, 0.98);
    backdrop-filter: blur(16px);
    padding: 1.5rem;
    gap: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--duration) var(--ease-out), opacity var(--duration) var(--ease-out), visibility var(--duration);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links a::after {
    display: none;
  }

  .nav-links a {
    padding: 0.5rem 0;
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 8px;
  }

  .timeline-item {
    padding-left: 2rem;
  }

  .timeline-marker {
    width: 12px;
    height: 12px;
    top: 1.25rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

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

  .projects-grid,
  .projects-grid-featured {
    grid-template-columns: 1fr;
  }
}