/* ============================================
   PERSONAL PORTFOLIO — STYLESHEET
   Design System + All Component Styles
   ============================================ */

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

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors — Dark Mode (default) */
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.08);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99,102,241,0.25);
  --gradient-1: linear-gradient(135deg, #6366f1, #8b5cf6);
  --gradient-2: linear-gradient(135deg, #6366f1, #06b6d4);
  --border: rgba(255,255,255,0.08);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --nav-bg: rgba(10,10,26,0.85);

  /* Typography */
  --font-body: 'Inter', sans-serif;
  --font-heading: 'Space Grotesk', sans-serif;

  /* Spacing */
  --section-pad: 100px 0;
  --container: 1140px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-primary: #f5f5fa;
  --bg-secondary: #eeeef5;
  --bg-card: rgba(0,0,0,0.03);
  --bg-card-hover: rgba(0,0,0,0.06);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a60;
  --text-muted: #8a8aa0;
  --border: rgba(0,0,0,0.08);
  --shadow: 0 8px 32px rgba(0,0,0,0.1);
  --nav-bg: rgba(245,245,250,0.85);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

a { color: var(--accent-light); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--accent); }

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

ul { list-style: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Section Utilities ---------- */
.section { padding: var(--section-pad); }

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-header .accent-line {
  width: 60px;
  height: 4px;
  background: var(--gradient-1);
  border-radius: 2px;
  margin: 0 auto 16px;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease), box-shadow 0.3s;
}

.navbar.scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.2); }

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links { display: flex; gap: 32px; align-items: center; }

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-1);
  border-radius: 1px;
  transition: width 0.3s var(--ease);
}

.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 42px; height: 42px;
  border-radius: 12px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  transition: all 0.3s var(--ease);
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  transform: rotate(15deg);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none; border: none; padding: 4px;
}

.hamburger span {
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 72px;
}

.hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  top: -100px; right: -200px;
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(139,92,246,0.15) 0%, transparent 70%);
  bottom: -50px; left: -100px;
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}

.hero-content { position: relative; z-index: 1; }

.hero-greeting {
  font-size: 1.1rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 12px;
  display: flex; align-items: center; gap: 10px;
}

.hero-greeting .wave { display: inline-block; animation: wave 2.5s ease-in-out infinite; transform-origin: 70% 70%; }

@keyframes wave {
  0%, 60%, 100% { transform: rotate(0); }
  10%, 30% { transform: rotate(14deg); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(-4deg); }
  50% { transform: rotate(10deg); }
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 8px;
}

.hero h1 .highlight {
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: 1.35rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-weight: 400;
}

.hero .description {
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 36px;
  font-size: 1.05rem;
}

.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.3s var(--ease);
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--gradient-1);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  color: var(--text-primary);
}

/* ---------- About Section ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
}

.about-image {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
  border-radius: 24px;
  background: var(--gradient-1);
  display: flex; align-items: center; justify-content: center;
  font-size: 6rem;
  margin: 0 auto;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.about-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.1));
}

.about-text h3 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.about-stats {
  display: flex; gap: 32px;
  margin-top: 28px;
}

.stat { text-align: center; }

.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- Skills Section ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 16px;
  text-align: center;
  transition: all 0.3s var(--ease);
  cursor: default;
}

.skill-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
}

.skill-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.skill-level {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 12px;
  overflow: hidden;
}

.skill-level-fill {
  height: 100%;
  background: var(--gradient-1);
  border-radius: 2px;
  width: 0;
  transition: width 1.2s var(--ease);
}

/* ---------- Projects Section ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  transition: all 0.4s var(--ease);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.3);
  border-color: var(--accent);
}

.project-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--bg-secondary);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  color: var(--text-muted);
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-content { padding: 24px; }

.project-content h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.project-content p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 16px;
  line-height: 1.6;
}

.project-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: 18px;
}

.project-tags span {
  background: var(--accent-glow);
  color: var(--accent-light);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
}

.project-links { display: flex; gap: 12px; }

.project-links a {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-primary);
  transition: all 0.3s;
}

.project-links a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---------- Resume Section ---------- */
.resume-section {
  text-align: center;
  background: var(--bg-secondary);
  border-radius: 24px;
  padding: 60px 40px;
  margin: 0 auto;
  max-width: 700px;
  border: 1px solid var(--border);
}

.resume-section h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.resume-section p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}

/* ---------- Contact Section ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}

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

.contact-link {
  display: flex; align-items: center; gap: 14px;
  color: var(--text-primary);
  font-weight: 500;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  transition: all 0.3s var(--ease);
}

.contact-link:hover {
  background: var(--bg-card-hover);
  transform: translateX(6px);
  border-color: var(--accent);
  color: var(--text-primary);
}

.contact-link .link-icon { font-size: 1.4rem; }

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

.form-group { position: relative; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 16px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.3s, box-shadow 0.3s;
  outline: none;
}

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

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

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

.form-error {
  color: #f87171;
  font-size: 0.82rem;
  margin-top: 6px;
  display: none;
}

.form-group.error input,
.form-group.error textarea { border-color: #f87171; }
.form-group.error .form-error { display: block; }

.form-success {
  background: rgba(34,197,94,0.1);
  color: #22c55e;
  padding: 14px 20px;
  border-radius: 12px;
  text-align: center;
  font-weight: 500;
  display: none;
}

.form-success.show { display: block; }

/* ---------- Footer ---------- */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

.footer-text { color: var(--text-muted); font-size: 0.9rem; }

.footer-socials { display: flex; gap: 12px; }

.footer-socials a {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: all 0.3s var(--ease);
}

.footer-socials a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-3px);
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

/* Stagger children */
.reveal-children > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal-children.visible > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-children.visible > *:nth-child(3) { transition-delay: 0.15s; }
.reveal-children.visible > *:nth-child(4) { transition-delay: 0.2s; }
.reveal-children.visible > *:nth-child(5) { transition-delay: 0.25s; }
.reveal-children.visible > *:nth-child(6) { transition-delay: 0.3s; }
.reveal-children.visible > *:nth-child(7) { transition-delay: 0.35s; }
.reveal-children.visible > *:nth-child(8) { transition-delay: 0.4s; }

.reveal-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive — Tablet ---------- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 3rem; }
  .about-grid { grid-template-columns: 1fr; text-align: center; }
  .about-image { margin: 0 auto 20px; max-width: 280px; }
  .about-stats { justify-content: center; }
}

/* ---------- Responsive — Mobile ---------- */
@media (max-width: 768px) {
  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.4s var(--ease);
    z-index: 999;
  }

  .nav-links.open { transform: translateY(0); }

  .hero h1 { font-size: 2.2rem; }
  .hero .tagline { font-size: 1.1rem; }
  .section-header h2 { font-size: 2rem; }

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

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

  .footer-content { flex-direction: column; }

  .hero-buttons { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}

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