:root {
  --color-primary: #0fa34a;
  --color-primary-dark: #0b833b;
  --color-primary-light: #4ade80;
  --color-accent: #e8c342;
  --color-accent-dark: #d4a81e;
  --color-bg: #f8fafc;
  --color-bg-alt: #f1f5f9;
  --color-surface: #ffffff;
  --color-surface-hover: #f8fafc;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-nav-bg: rgba(255,255,255,0.85);
  --color-card-shadow: rgba(0,0,0,0.06);
  --color-hero-bg: linear-gradient(135deg, #f0fdf4 0%, #fefce8 50%, #f0fdf4 100%);
  --section-padding: 5rem 0;
  --container-width: 1100px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);
}

[data-theme="dark"] {
  --color-bg: #0b1120;
  --color-bg-alt: #111827;
  --color-surface: #1e293b;
  --color-surface-hover: #263348;
  --color-text: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #64748b;
  --color-border: #334155;
  --color-nav-bg: rgba(15,23,42,0.9);
  --color-card-shadow: rgba(0,0,0,0.3);
  --color-hero-bg: linear-gradient(135deg, #0b1a0f 0%, #1a1408 50%, #0b1a0f 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.3s, border-color 0.3s;
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-primary);
  z-index: 1001;
}

.nav-logo-img {
  height: 36px;
  width: auto;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all 0.2s;
}

.nav-links a:hover {
  color: var(--color-primary);
  background: var(--color-surface-hover);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.4rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  transition: all 0.2s;
  z-index: 1001;
}

.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.theme-toggle .sun { display: block; }
.theme-toggle .moon { display: none; }

[data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: block; }

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-hero-bg);
  overflow: hidden;
  transition: background 0.5s;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(15,163,74,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(232,195,66,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  padding: 6rem 0 3rem;
}

.hero-logo-wrapper {
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease-out;
}

.hero-logo-img {
  max-width: 260px;
  margin: 0 auto;
  filter: drop-shadow(0 4px 20px rgba(15,163,74,0.15));
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto 1.5rem;
  line-height: 1.7;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.badge {
  padding: 0.35rem 1rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-green {
  background: rgba(15,163,74,0.12);
  color: var(--color-primary);
  border: 1px solid rgba(15,163,74,0.2);
}

.badge-blue {
  background: rgba(59,130,246,0.12);
  color: #3b82f6;
  border: 1px solid rgba(59,130,246,0.2);
}

.badge-yellow {
  background: rgba(232,195,66,0.15);
  color: #b8860b;
  border: 1px solid rgba(232,195,66,0.3);
}

[data-theme="dark"] .badge-yellow {
  color: var(--color-accent);
}

.badge-outline {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  animation: bounce 2s infinite;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(15,163,74,0.3);
}

.btn-secondary {
  background: #5865F2;
  color: white;
}

.btn-secondary:hover {
  background: #4752c4;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(88,101,242,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  background: var(--color-surface-hover);
  border: 1px solid var(--color-border);
}

.btn-icon:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(15,163,74,0.06);
}

.btn-small {
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
}

/* Sections */
.section {
  padding: var(--section-padding);
  transition: background 0.3s;
}

.section-dark {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  padding: 0.25rem 0.9rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(15,163,74,0.1);
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all 0.25s;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15,163,74,0.2);
}

.about-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(15,163,74,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.about-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.about-card p {
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* Projects */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all 0.25s;
}

.project-card:hover {
  border-color: rgba(15,163,74,0.2);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.project-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(15,163,74,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.project-meta {
  flex: 1;
}

.project-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.project-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-card .badge {
  font-size: 0.7rem;
  padding: 0.2rem 0.7rem;
}

.project-desc {
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 1rem;
}

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

.tech-tag {
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.project-stats {
  display: flex;
  gap: 1.2rem;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.project-stats span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.section-cta {
  text-align: center;
  margin-top: 2.5rem;
}

.section-cta p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-size: 0.92rem;
}

/* Tech Grid */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.tech-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  transition: all 0.25s;
}

.tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15,163,74,0.2);
}

.tech-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(15,163,74,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin: 0 auto 1rem;
  transition: background 0.3s, transform 0.3s;
}

.tech-card:hover .tech-icon {
  background: rgba(15,163,74,0.18);
  transform: scale(1.05);
}

.tech-card h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.tech-card p {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Roadmap */
.roadmap {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.roadmap::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: var(--color-border);
}

.roadmap-item {
  display: flex;
  gap: 1.5rem;
  padding-bottom: 2.5rem;
  position: relative;
}

.roadmap-item:last-child {
  padding-bottom: 0;
}

.roadmap-marker {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  transition: all 0.3s;
}

.roadmap-item.done .roadmap-marker {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.roadmap-item.active .roadmap-marker {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #1a1a2e;
  animation: pulse 2s infinite;
}

.roadmap-content {
  padding-top: 0.5rem;
}

.roadmap-status {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  margin-bottom: 0.4rem;
}

.roadmap-status.done {
  background: rgba(15,163,74,0.12);
  color: var(--color-primary);
}

.roadmap-status.active {
  background: rgba(232,195,66,0.15);
  color: #b8860b;
}

[data-theme="dark"] .roadmap-status.active {
  color: var(--color-accent);
}

.roadmap-status.pending {
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
}

.roadmap-content h4 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.roadmap-content p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* Contribute */
.contribute-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.contribute-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  position: relative;
  transition: all 0.25s;
}

.contribute-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15,163,74,0.2);
}

.contribute-num {
  position: absolute;
  top: 1.2rem;
  right: 1.5rem;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-border);
  line-height: 1;
  pointer-events: none;
}

.contribute-card-icon {
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.contribute-card h4 {
  font-size: 1rem;
  margin-bottom: 0.6rem;
}

.contribute-card p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

/* Footer */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
  transition: background 0.3s, border-color 0.3s;
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.footer-logo-img {
  height: 32px;
  width: auto;
}

.footer-brand-text {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
}

.footer-desc {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  max-width: 450px;
  margin: 0 auto 1.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-copy {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(232,195,66,0.4); }
  50% { box-shadow: 0 0 0 12px rgba(232,195,66,0); }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 260px;
    height: 100vh;
    flex-direction: column;
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    padding: 5rem 1.5rem 2rem;
    gap: 0.25rem;
    transition: right 0.3s;
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .navbar .theme-toggle {
    margin-left: auto;
    margin-right: 0.5rem;
  }

  .hero-title {
    font-size: 1.7rem;
  }

  .hero-logo-img {
    max-width: 180px;
  }

  .about-grid,
  .tech-grid,
  .contribute-grid {
    grid-template-columns: 1fr;
  }

  .project-card-header {
    flex-wrap: wrap;
  }

  .roadmap::before {
    left: 18px;
  }

  .roadmap-marker {
    width: 38px;
    height: 38px;
    font-size: 0.8rem;
  }

  .roadmap-content {
    padding-top: 0.2rem;
  }

  .hero-scroll {
    display: none;
  }
}