/* ════════════════════════════════════════════════════════════════════
   Fengyou Studio — 黑紫设计系统 (Based on Mineradio Purple Theme)
   ════════════════════════════════════════════════════════════════════ */

:root {
  /* Purple Accent */
  --accent: #a78bfa;
  --accent-rgb: 167, 139, 250;
  --accent-hover: #8b5cf6;
  --accent-active: #7c3aed;
  --accent-muted: rgba(167, 139, 250, 0.12);
  --accent-glow: 0 0 24px rgba(167, 139, 250, 0.35), 0 0 64px rgba(167, 139, 250, 0.1);

  /* Neutrals */
  --bg-deep: #0c0c14;
  --bg-surface: #14141f;
  --bg-raised: #1c1c2e;
  --bg-overlay: rgba(12, 12, 20, 0.92);

  --text-primary: #f1f1f9;
  --text-secondary: #9d9db5;
  --text-tertiary: #6b6b85;

  /* Borders */
  --border: rgba(167, 139, 250, 0.15);
  --border-strong: rgba(167, 139, 250, 0.3);
  --border-subtle: rgba(255, 255, 255, 0.06);

  /* Glass */
  --glass-bg: linear-gradient(135deg, rgba(167,139,250,0.06), rgba(20,20,31,0.85));
  --glass-border: rgba(167,139,250,0.18);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.4);

  /* Layout */
  --sidebar-w: 220px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  /* Font */
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;

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

/* ══════════════════════ Reset & Base ══════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ══════════════════════ Starfield BG + Parallax Layer ══════════════════════ */
#starfield {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,.7), transparent),
    radial-gradient(1px 1px at 25% 40%, rgba(167,139,250,.6), transparent),
    radial-gradient(1.5px 1.5px at 35% 8%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 50% 55%, rgba(167,139,250,.5), transparent),
    radial-gradient(1.5px 1.5px at 60% 22%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 70% 65%, rgba(200,200,255,.4), transparent),
    radial-gradient(1px 1px at 80% 12%, rgba(255,255,255,.5), transparent),
    radial-gradient(2px 2px at 85% 48%, rgba(167,139,250,.3), transparent),
    radial-gradient(1px 1px at 15% 78%, rgba(255,255,255,.4), transparent),
    radial-gradient(1.5px 1.5px at 42% 85%, rgba(167,139,250,.5), transparent),
    radial-gradient(1px 1px at 65% 92%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 92% 72%, rgba(167,139,250,.3), transparent),
    radial-gradient(1.5px 1.5px at 8% 48%, rgba(167,139,250,.35), transparent),
    radial-gradient(1px 1px at 30% 28%, rgba(200,200,255,.5), transparent),
    radial-gradient(1px 1px at 55% 80%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 75% 35%, rgba(167,139,250,.4), transparent)
  ;
  transition: transform 0.6s var(--ease);
}
#starfield-2 {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.5;
  background:
    radial-gradient(1.5px 1.5px at 20% 60%, rgba(167,139,250,.35), transparent),
    radial-gradient(1px 1px at 45% 10%, rgba(200,200,255,.5), transparent),
    radial-gradient(2px 2px at 70% 80%, rgba(167,139,250,.2), transparent),
    radial-gradient(1px 1px at 90% 40%, rgba(255,255,255,.4), transparent)
  ;
  transition: transform 1s var(--ease);
}

/* ══════════════════════ Scroll Animations ══════════════════════ */
.reveal-up, .reveal-fade, .reveal-scale, .reveal-card, .reveal-right {
  opacity: 0;
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal-up { transform: translateY(40px); }
.reveal-fade { transform: translateY(20px); }
.reveal-scale { transform: scale(0.92); }
.reveal-card { transform: translateY(30px); }
.reveal-right { transform: translateX(30px); }

.reveal-up.visible, .reveal-fade.visible, .reveal-scale.visible, .reveal-card.visible, .reveal-right.visible {
  opacity: 1; transform: none;
}
.reveal-card.visible { transition-delay: calc(var(--delay, 0) * 0.12s); }

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* ══════════════════════ Hero ══════════════════════ */
.hero-badge {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  border: 1px solid var(--border-strong); font-size: 0.8rem;
  color: var(--accent); margin-bottom: 24px;
  background: var(--accent-muted);
}
.hero-glow {
  position: relative; overflow: hidden;
}
.hero-glow::after {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.15), transparent 70%);
  animation: heroShine 3s infinite;
}
@keyframes heroShine {
  0%, 100% { transform: translate(-30%, -30%); }
  50% { transform: translate(30%, 30%); }
}
.hero-stats { color: var(--text-primary); }
.stat-num {
  font-size: 2rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #c4b5fd);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ══════════════════════ Section Tag ══════════════════════ */
.section-tag {
  display: inline-block; font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 2px; color: var(--accent); margin-bottom: 12px;
}

/* ══════════════════════ Card Icon ══════════════════════ */
.card-icon { font-size: 2.2rem; margin-bottom: 14px; }

/* ══════════════════════ Showcase Card ══════════════════════ */
.showcase-card {
  background: linear-gradient(135deg, rgba(167,139,250,0.08), rgba(20,20,31,0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 48px;
  position: relative; overflow: hidden;
}
.showcase-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(600px circle at 80% 20%, rgba(167,139,250,0.08), transparent);
  pointer-events: none;
}
.showcase-badge {
  display: inline-block; padding: 3px 12px; border-radius: 12px;
  font-size: 0.75rem; color: var(--accent); border: 1px solid var(--border-strong);
  margin-bottom: 20px; background: var(--accent-muted);
}
.model-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.model-tag {
  padding: 6px 14px; border-radius: 20px; font-size: 0.8rem;
  border: 1px solid var(--border); color: var(--text-secondary);
  transition: border-color 0.2s var(--ease);
}
.model-tag.recommended {
  background: var(--accent-muted); border-color: var(--accent); color: var(--accent);
}

/* ══════════════════════ Glow Text ══════════════════════ */
.glow-text {
  animation: textGlow 3s ease-in-out infinite alternate;
}
@keyframes textGlow {
  from { filter: drop-shadow(0 0 6px rgba(167,139,250,0.2)); }
  to { filter: drop-shadow(0 0 16px rgba(167,139,250,0.4)); }
}

/* ══════════════════════ Layout ══════════════════════ */
#app { display: flex; min-height: 100vh; position: relative; z-index: 1; }

#main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
}

/* ══════════════════════ Typography ══════════════════════ */
h1 { font-size: 2.8rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }
h2 { font-size: 2rem; font-weight: 600; letter-spacing: -0.01em; }
h3 { font-size: 1.3rem; font-weight: 600; }
.gradient-text {
  background: linear-gradient(135deg, var(--accent), #c4b5fd, var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ══════════════════════ Buttons ══════════════════════ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-sm); font-size: 0.95rem;
  font-weight: 600; font-family: var(--font); cursor: pointer; border: none;
  transition: all 0.2s var(--ease); text-decoration: none;
}
.btn-primary {
  background: var(--accent); color: var(--bg-deep);
  box-shadow: var(--accent-glow);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-outline {
  background: transparent; color: var(--accent);
  border: 1px solid var(--border-strong);
}
.btn-outline:hover { background: var(--accent-muted); border-color: var(--accent); }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; border-radius: var(--radius); }

/* ══════════════════════ Cards ══════════════════════ */
.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(16px);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }

/* ══════════════════════ Sections ══════════════════════ */
.section { padding: 80px 48px; max-width: 1100px; }
.section-header { margin-bottom: 48px; }
.section-header h2 { margin-bottom: 12px; }
.section-header p { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; }

/* ══════════════════════ Grid ══════════════════════ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ══════════════════════ FAQ ══════════════════════ */
.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm); padding: 20px 24px;
  margin-bottom: 12px; cursor: pointer;
  transition: border-color 0.2s var(--ease);
}
.faq-item:hover { border-color: var(--border); }
.faq-q { font-weight: 600; font-size: 1rem; color: var(--text-primary); display: flex; justify-content: space-between; align-items: center; }
.faq-a { color: var(--text-secondary); font-size: 0.9rem; margin-top: 12px; line-height: 1.7; display: none; }
.faq-item.open .faq-a { display: block; }
.faq-item.open { border-color: var(--border-strong); background: var(--accent-muted); }
.faq-arrow { transition: transform 0.2s var(--ease); color: var(--text-tertiary); }
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--accent); }

/* ══════════════════════ Pricing ══════════════════════ */
.pricing-wrap { padding: 20px 0; }
.pricing-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg); padding: 40px 36px;
  backdrop-filter: blur(16px);
  position: relative; overflow: hidden;
  max-width: 420px; width: 100%;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.pricing-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(400px circle at 50% 0%, rgba(167,139,250,0.06), transparent);
  pointer-events: none;
}
.pricing-card-main {
  border-color: var(--border-strong);
  box-shadow: 0 0 40px rgba(167,139,250,0.08);
}
.pricing-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.pricing-badge {
  position: absolute; top: 16px; right: 16px;
  padding: 3px 12px; border-radius: 12px; font-size: 0.7rem;
  background: var(--accent); color: var(--bg-deep); font-weight: 600;
}
.pricing-plan { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 16px; font-weight: 500; }
.pricing-price { font-size: 3rem; font-weight: 700; margin-bottom: 24px; color: var(--text-primary); }
.pricing-currency { font-size: 1.5rem; vertical-align: super; }
.pricing-period { font-size: 1rem; color: var(--text-tertiary); font-weight: 400; }
.pricing-features { list-style: none; margin-bottom: 24px; }
.pricing-features li {
  padding: 8px 0; border-bottom: 1px solid var(--border-subtle);
  font-size: 0.9rem; color: var(--text-secondary);
}
.pricing-features li::before { content: '✓ '; color: var(--accent); font-weight: 700; margin-right: 6px; }

/* ══════════════════════ Footer ══════════════════════ */
footer { border-top: 1px solid var(--border-subtle); padding: 32px 48px; margin-top: 80px; }
footer p { color: var(--text-tertiary); font-size: 0.85rem; }

/* ══════════════════════ Responsive ══════════════════════ */
@media (max-width: 900px) {
  :root { --sidebar-w: 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 48px 24px; }
  h1 { font-size: 2rem; }
}