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

:root {
  --green-50: #e8f5e9;
  --green-100: #c8e6c9;
  --green-200: #a5d6a7;
  --green-300: #81c784;
  --green-400: #66bb6a;
  --green-500: #4caf50;
  --green-600: #43a047;
  --green-700: #388e3c;
  --green-800: #2e7d32;
  --green-900: #1b5e20;
  --green-950: #0d3b10;
  --warn: #cac700;

  --ghost-glow: rgba(76, 175, 80, 0.15);
  --ghost-glow-strong: rgba(76, 175, 80, 0.3);

  --bg: #f7faf7;
  --bg-card: #ffffff;
  --text: #1a1a1a;
  --text-muted: #5a6a5a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a {
  color: var(--green-700);
  text-decoration: none;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--green-800);
}

.nav-logo img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--green-700);
}

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

.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  background: linear-gradient(160deg, var(--green-50) 0%, #ffffff 40%, var(--green-50) 100%);
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--ghost-glow-strong) 0%, transparent 70%);
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  animation: pulse-glow 4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes pulse-glow {
  0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.6; }
  50% { transform: translateX(-50%) scale(1.15); opacity: 1; }
}

.hero-bg-ghost {
  position: absolute;
  font-size: 30rem;
  opacity: 0.04;
  bottom: -5%;
  right: -5%;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

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

.hero-logo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 60px var(--ghost-glow);
  margin-bottom: 24px;
  animation: float 5s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--green-700), var(--green-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.5;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.25s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--green-600);
  color: #fff;
  box-shadow: 0 4px 16px var(--ghost-glow);
}

.btn-primary:hover {
  background: var(--green-700);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--ghost-glow-strong);
}

.btn-secondary {
  background: transparent;
  color: var(--green-700);
  border: 2px solid var(--green-300);
}

.btn-secondary:hover {
  background: var(--green-50);
  border-color: var(--green-500);
  transform: translateY(-2px);
}

.btn.disabled,
.btn:disabled,
.btn[href="#"],
a.btn:not([href]) {
  opacity: 0.5;
  pointer-events: none;
  cursor: default;
}

/* ====== Sections ====== */

.section {
  padding: 100px 0;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  color: var(--green-900);
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 48px;
}

.section:nth-child(even) {
  background: var(--green-50);
}

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

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  margin-bottom: 16px;
  font-size: 1.05rem;
  color: #333;
}

.about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 50px;
  background: var(--green-100);
  color: var(--green-800);
  font-size: 0.85rem;
  font-weight: 500;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.highlight-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  border: 1px solid rgba(0,0,0,0.04);
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.highlight-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 8px;
}

.highlight-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--green-800);
}

/* ====== Features ====== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  border: 1px solid rgba(0,0,0,0.04);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green-300), var(--green-500));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--green-800);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ====== Architecture ====== */

.arch-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.arch-step {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04);
  transition: transform 0.25s ease;
}

.arch-step:hover {
  transform: translateY(-4px);
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--green-500);
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  box-shadow: 0 4px 12px var(--ghost-glow);
}

.arch-step h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--green-800);
}

.arch-step p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.arch-arrow {
  font-size: 1.8rem;
  color: var(--green-400);
  padding-top: 48px;
  flex-shrink: 0;
}

/* ====== Download ====== */

.download-tabs {
  display: flex;
  justify-content: center;
  gap: 4px;
  background: var(--green-100);
  border-radius: 50px;
  padding: 4px;
  max-width: 320px;
  margin: 0 auto 32px;
}

.tab-btn {
  flex: 1;
  padding: 10px 24px;
  border: none;
  border-radius: 50px;
  background: transparent;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s ease;
}

.tab-btn.active {
  background: #fff;
  color: var(--green-800);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.release-card {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04);
  position: relative;
  border-color: var(--green-200);
}

.release-card.dev {
  border-color: var(--warn);
}

.release-badge {
  display: inline-block;
  padding: 4px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.release-badge.stable {
  background: var(--green-500);
  color: #fff;
}

.release-badge.dev {
  background: var(--warn);
  color: #fff;
}

.release-version {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--green-800);
  margin-bottom: 8px;
}

.release-info {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.release-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 16px;
}

.release-note code {
  background: var(--green-50);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
}

.update-info {
  max-width: 600px;
  margin: 48px auto 0;
  background: var(--green-50);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--green-200);
}

.update-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green-800);
  margin-bottom: 8px;
}

.update-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

pre.code {
  background: var(--green-100);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  overflow-x: auto;
  margin: 12px 0;
}

pre.code code {
  font-size: 0.85rem;
  color: var(--green-900);
}

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

.contact-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 32px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  border: 1px solid rgba(0,0,0,0.04);
  min-width: 140px;
  color: var(--text);
  font-weight: 500;
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  color: var(--green-700);
}

.contact-icon {
  font-size: 1.8rem;
}

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

.footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid rgba(0,0,0,0.04);
}

.footer-ghost {
  margin-top: 8px;
  font-weight: 600;
  color: var(--green-500);
}

/* ====== Responsive ====== */

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: 70vh;
    padding: 100px 20px 60px;
  }

  .hero-logo {
    width: 100px;
    height: 100px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .arch-steps {
    flex-direction: column;
    align-items: center;
  }

  .arch-arrow {
    transform: rotate(90deg);
    padding: 0;
  }

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

  .release-card {
    padding: 28px 20px;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 60px 0;
  }
}