@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #ebebeb;
  --text-primary: #000000;
  --text-secondary: #555555;
  --text-tertiary: #888888;
  --border-color: #e0e0e0;
  --accent: #000000;
  --accent-hover: #333333;
  --card-bg: #ffffff;
  --shadow: 0 2px 20px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 40px rgba(0,0,0,0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
}

[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #aaaaaa;
  --text-tertiary: #666666;
  --border-color: #222222;
  --accent: #ffffff;
  --accent-hover: #cccccc;
  --card-bg: #141414;
  --shadow: 0 2px 20px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 40px rgba(0,0,0,0.5);
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--text-tertiary); border-radius: 3px; }

/* ── NAV ── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 1.25rem 3rem;
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-primary);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}
.nav.scrolled { border-bottom-color: var(--border-color); backdrop-filter: blur(20px); background: rgba(255,255,255,0.85); }
[data-theme="dark"] .nav.scrolled { background: rgba(10,10,10,0.85); }
.nav-logo { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { font-size: 0.875rem; font-weight: 500; position: relative; transition: color var(--transition); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1.5px;
  background: var(--text-primary); transition: width var(--transition);
}
.nav-links a:hover::after { width: 100%; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-color); font-size: 1.1rem; transition: all var(--transition);
}
.theme-toggle:hover { background: var(--text-primary); color: var(--bg-primary); }
.nav-hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-hamburger span { width: 24px; height: 2px; background: var(--text-primary); transition: all var(--transition); }

/* ── HERO ── */
.hero {
  min-height: 100vh; display: flex; flex-direction: column; justify-content: center;
  padding: 8rem 3rem 4rem;
}
.hero-label {
  font-size: 0.8rem; font-weight: 600; letter-spacing: 3px; text-transform: uppercase;
  color: var(--text-tertiary); margin-bottom: 1.5rem;
  opacity: 0; animation: fadeUp 0.8s 0.2s forwards;
}
.hero-title {
  font-size: clamp(3rem, 7.5vw, 7.5rem); font-weight: 800; line-height: 0.95;
  letter-spacing: -3px; margin-bottom: 2rem;
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title .line span {
  display: inline-block; opacity: 0; transform: translateY(100%);
  animation: slideUp 0.8s forwards;
}
.hero-title .line:nth-child(1) span { animation-delay: 0.3s; }
.hero-title .line:nth-child(2) span { animation-delay: 0.5s; }
.hero-title .line:nth-child(3) span { animation-delay: 0.7s; }
.hero-subtitle {
  font-size: 1.15rem; color: var(--text-secondary); max-width: 500px;
  line-height: 1.7; opacity: 0; animation: fadeUp 0.8s 0.9s forwards;
}
.scroll-indicator {
  position: absolute; bottom: 2rem; left: 3rem;
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 0.75rem; font-weight: 500; letter-spacing: 2px; text-transform: uppercase;
  color: var(--text-tertiary); opacity: 0; animation: fadeUp 0.8s 1.2s forwards;
}
.scroll-line { width: 40px; height: 1px; background: var(--text-tertiary); animation: scrollPulse 2s infinite; }

/* ── SECTION COMMON ── */
.section { padding: 6rem 3rem; }
.section-header {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 3rem; flex-wrap: wrap; gap: 1rem;
}
.section-label {
  font-size: 0.75rem; font-weight: 600; letter-spacing: 3px; text-transform: uppercase;
  color: var(--text-tertiary); margin-bottom: 0.75rem;
}
.section-title { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; letter-spacing: -1px; }

/* ── FILTER TABS ── */
.filter-tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.filter-tab {
  padding: 0.5rem 1.25rem; border-radius: 100px; font-size: 0.8rem; font-weight: 500;
  border: 1px solid var(--border-color); color: var(--text-secondary); transition: all var(--transition);
}
.filter-tab:hover, .filter-tab.active {
  background: var(--text-primary); color: var(--bg-primary); border-color: var(--text-primary);
}

/* ── PORTFOLIO GRID ── */
.portfolio-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
}
.project-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: var(--card-bg); border: 1px solid var(--border-color);
  transition: all var(--transition); cursor: pointer;
}
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.project-card-image {
  width: 100%; aspect-ratio: 4/3; overflow: hidden; background: var(--bg-tertiary);
}
.project-card-image img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.project-card:hover .project-card-image img { transform: scale(1.05); }
.project-card-info { padding: 1.25rem 1.5rem; }
.project-card-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.25rem; }
.project-card-client { font-size: 0.8rem; color: var(--text-tertiary); margin-bottom: 0.75rem; }
.project-card-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.project-card-tag {
  font-size: 0.7rem; font-weight: 500; padding: 0.2rem 0.6rem; border-radius: 100px;
  background: var(--bg-secondary); color: var(--text-secondary);
}

/* ── ABOUT ── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.about-text { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.8; }
.about-text p { margin-bottom: 1.5rem; }
.skills-title { font-size: 1rem; font-weight: 700; margin-bottom: 1.5rem; letter-spacing: -0.3px; }
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.skill-item {
  padding: 0.75rem 1rem; border-radius: 8px; font-size: 0.85rem; font-weight: 500;
  background: var(--bg-secondary); border: 1px solid var(--border-color); transition: all var(--transition);
}
.skill-item:hover { border-color: var(--text-primary); transform: translateX(4px); }

/* ── CONTACT ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }
.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; }
.form-group input, .form-group textarea {
  padding: 0.9rem 1rem; border-radius: 8px; font-size: 0.95rem; font-family: var(--font);
  border: 1px solid var(--border-color); background: var(--bg-secondary);
  color: var(--text-primary); transition: all var(--transition); outline: none;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--text-primary); }
.form-group textarea { resize: vertical; min-height: 140px; }
.btn-submit {
  padding: 1rem 2rem; border-radius: 8px; font-size: 0.9rem; font-weight: 600;
  background: var(--text-primary); color: var(--bg-primary);
  transition: all var(--transition); letter-spacing: 0.5px;
}
.btn-submit:hover { opacity: 0.85; transform: translateY(-2px); }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.form-status { font-size: 0.85rem; font-weight: 500; padding: 0.75rem; border-radius: 8px; display: none; }
.form-status.success { display: block; background: #e8f5e9; color: #2e7d32; }
.form-status.error { display: block; background: #ffebee; color: #c62828; }
[data-theme="dark"] .form-status.success { background: #1a2e1a; color: #66bb6a; }
[data-theme="dark"] .form-status.error { background: #2e1a1a; color: #ef5350; }
.contact-info h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
.contact-info p { color: var(--text-secondary); margin-bottom: 2rem; line-height: 1.7; }
.social-links { display: flex; flex-direction: column; gap: 0.75rem; }
.social-link {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 0.95rem; font-weight: 500; padding: 0.75rem 1rem; border-radius: 8px;
  border: 1px solid var(--border-color); transition: all var(--transition);
}
.social-link:hover { background: var(--text-primary); color: var(--bg-primary); border-color: var(--text-primary); }

/* ── FOOTER ── */
.footer {
  padding: 2rem 3rem; border-top: 1px solid var(--border-color);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.8rem; color: var(--text-tertiary);
}

/* ── PROJECT DETAIL ── */
.project-hero { padding: 8rem 3rem 3rem; }
.project-back {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.85rem; font-weight: 500; margin-bottom: 2rem; transition: opacity var(--transition);
}
.project-back:hover { opacity: 0.6; }
.project-meta {
  display: flex; gap: 2rem; margin-bottom: 1.5rem; flex-wrap: wrap;
  font-size: 0.8rem; color: var(--text-tertiary); letter-spacing: 1px; text-transform: uppercase; font-weight: 500;
}
.project-detail-title { font-size: clamp(2rem, 5vw, 4rem); font-weight: 800; letter-spacing: -2px; margin-bottom: 1rem; }
.project-detail-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.project-detail-tag {
  padding: 0.4rem 1rem; border-radius: 100px; font-size: 0.8rem; font-weight: 500;
  border: 1px solid var(--border-color);
}
.project-cover { width: 100%; padding: 0 3rem; }
.project-cover img { width: 100%; border-radius: var(--radius); aspect-ratio: 16/9; object-fit: cover; }
.project-content { max-width: 800px; margin: 3rem auto; padding: 0 3rem; }
.project-content h2 { font-size: 1.5rem; font-weight: 700; margin: 2.5rem 0 1rem; letter-spacing: -0.5px; }
.project-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 1rem; font-size: 1.05rem; }
.project-content img { border-radius: var(--radius); margin: 2rem 0; }
.project-gallery { padding: 2rem 3rem 4rem; }
.project-gallery-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 1.5rem; }
.gallery-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem;
}
.gallery-item {
  border-radius: var(--radius); overflow: hidden; cursor: pointer;
  aspect-ratio: 4/3; background: var(--bg-tertiary);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.gallery-item:hover img { transform: scale(1.05); }

/* ── LIGHTBOX ── */
.lightbox {
  position: fixed; inset: 0; z-index: 9999; background: rgba(0,0,0,0.95);
  display: none; align-items: center; justify-content: center;
}
.lightbox.active { display: flex; }
.lightbox img { max-width: 90vw; max-height: 90vh; object-fit: contain; border-radius: 8px; }
.lightbox-close {
  position: absolute; top: 1.5rem; right: 1.5rem; color: #fff; font-size: 2rem;
  cursor: pointer; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; transition: background 0.3s;
}
.lightbox-close:hover { background: rgba(255,255,255,0.1); }
.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%); color: #fff; font-size: 2rem;
  cursor: pointer; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; transition: background 0.3s;
}
.lightbox-nav:hover { background: rgba(255,255,255,0.1); }
.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

/* ── ANIMATIONS ── */
@keyframes slideUp { to { opacity: 1; transform: translateY(0); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scrollPulse { 0%, 100% { opacity: 0.3; } 50% { opacity: 1; } }
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── EMPTY STATE ── */
.empty-state { text-align: center; padding: 4rem 2rem; color: var(--text-tertiary); }
.empty-state-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state-text { font-size: 1.1rem; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: var(--bg-primary); flex-direction: column; justify-content: center; align-items: center; gap: 2rem; z-index: 999; }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.5rem; }
  .nav-hamburger { display: flex; z-index: 1000; }
  .hero { padding: 7rem 1.5rem 3rem; }
  .hero-title { letter-spacing: -1.5px; }
  .section { padding: 4rem 1.5rem; }
  .portfolio-grid { grid-template-columns: 1fr; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .project-hero, .project-cover, .project-content, .project-gallery { padding-left: 1.5rem; padding-right: 1.5rem; }
  .footer { flex-direction: column; gap: 0.5rem; text-align: center; padding: 1.5rem; }
  .scroll-indicator { left: 1.5rem; }
}
@media (max-width: 480px) {
  .portfolio-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
}