/* =====================================================
   YIS 共享算力平台 - 主样式表
   Sci-Fi 暗黑主题 · 霓虹青色/紫色/绿色
   ===================================================== */

/* ========== CSS VARIABLES ========== */
:root {
  --bg-deep: #06060B;
  --bg-card: #0D0D1A;
  --bg-card-hover: #12122A;
  --primary: #00E5FF;
  --primary-dim: rgba(0, 229, 255, 0.15);
  --secondary: #7B2FFF;
  --secondary-dim: rgba(123, 47, 255, 0.15);
  --accent: #00FF88;
  --accent-dim: rgba(0, 255, 136, 0.15);
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.65);
  --text-tertiary: rgba(255, 255, 255, 0.4);
  --border: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 229, 255, 0.25);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ========== PARTICLE CANVAS ========== */
#particleCanvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; opacity: 0.6;
}

/* ========== NAVBAR ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(6, 6, 11, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar.scrolled { background: rgba(6, 6, 11, 0.95); }

.nav-container {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 72px;
}

.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 1.5rem; }
.logo-icon {
  color: var(--primary); font-size: 1.6rem;
  filter: drop-shadow(0 0 8px var(--primary));
}
.logo-text { letter-spacing: 2px; }

.nav-menu { display: flex; gap: 32px; }
.nav-menu a {
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  transition: var(--transition); position: relative;
}
.nav-menu a:hover { color: var(--primary); }
.nav-menu a::after {
  content: ""; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--primary); transition: var(--transition);
}
.nav-menu a:hover::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text-primary); transition: var(--transition); }

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 24px; border-radius: 8px; font-size: 0.9rem; font-weight: 600;
  cursor: pointer; border: none; transition: var(--transition);
  font-family: inherit; letter-spacing: 0.3px;
}
.btn-lg { padding: 14px 36px; font-size: 1rem; border-radius: 12px; }
.btn-block { width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #000; font-weight: 700;
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 50px rgba(0, 229, 255, 0.4); }

.btn-outline {
  background: transparent; border: 1px solid var(--border-glow); color: var(--primary);
  backdrop-filter: blur(10px);
}
.btn-outline:hover { background: rgba(0, 229, 255, 0.1); border-color: var(--primary); }

.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--primary); }

/* ========== HERO SECTION ========== */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; padding: 120px 24px 80px;
}
.hero-grid-overlay {
  position: absolute; inset: 0; opacity: 0.04;
  background-image: linear-gradient(rgba(0, 229, 255, 0.5) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(0, 229, 255, 0.5) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-glow {
  position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.3;
}
.hero-glow--left { width: 500px; height: 500px; background: var(--primary); top: -100px; left: -100px; }
.hero-glow--right { width: 400px; height: 400px; background: var(--secondary); bottom: -50px; right: -80px; }
.hero-ring {
  position: absolute; border-radius: 50%; border: 1px solid rgba(0, 229, 255, 0.1);
  opacity: 0.3;
}
.hero-ring--1 { width: 600px; height: 600px; top: 10%; left: -200px; }
.hero-ring--2 { width: 300px; height: 300px; bottom: 15%; right: -80px; border-color: rgba(123, 47, 255, 0.15); }

.hero-content { position: relative; z-index: 1; text-align: center; max-width: 900px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 20px; border-radius: 50px;
  background: rgba(0, 229, 255, 0.1); border: 1px solid rgba(0, 229, 255, 0.25);
  font-size: 0.85rem; color: var(--primary); margin-bottom: 32px;
}
.pulse-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.6); }
  50% { box-shadow: 0 0 0 10px rgba(0, 255, 136, 0); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 900; line-height: 1.1;
  margin-bottom: 24px; letter-spacing: -1px;
}
.hero-title-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle { color: var(--text-secondary); font-size: 1.1rem; max-width: 650px; margin: 0 auto 40px; }

.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }

.hero-stats {
  display: flex; gap: 48px; justify-content: center; flex-wrap: wrap;
  padding: 28px 48px; border-radius: 16px;
  background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.hero-stat { text-align: center; }
.stat-num { display: block; font-size: 2rem; font-weight: 900; color: var(--primary); }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); }

.hero-scroll-indicator {
  position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-tertiary); font-size: 0.8rem;
}
.scroll-arrow { animation: bounce 2s infinite; font-size: 1.2rem; }
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ========== SECTIONS ========== */
.section { padding: 100px 24px; position: relative; z-index: 1; }
.section-dark { background: rgba(13, 13, 26, 0.5); }

.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block; padding: 6px 16px; border-radius: 50px;
  background: var(--primary-dim); color: var(--primary); font-size: 0.8rem;
  font-weight: 600; margin-bottom: 16px;
}
.section-title { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900; margin-bottom: 12px; }
.section-desc { color: var(--text-secondary); font-size: 1.05rem; }

/* ========== STEPS GRID ========== */
.steps-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.step-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 36px 28px; position: relative; overflow: hidden;
  transition: var(--transition);
}
.step-card:hover { border-color: var(--border-glow); transform: translateY(-4px); }
.step-number {
  position: absolute; top: 16px; right: 20px; font-size: 3rem; font-weight: 900;
  color: rgba(255, 255, 255, 0.03);
}
.step-icon { font-size: 2.5rem; margin-bottom: 16px; }
.step-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 12px; }
.step-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

/* ========== PRODUCT GRID ========== */
.product-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.product-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 24px; position: relative; overflow: hidden; cursor: pointer;
  transition: var(--transition);
}
.product-card:hover { border-color: var(--border-glow); transform: translateY(-4px); }
.product-card:hover .product-card-glow {
  opacity: 1;
}
.product-card-glow {
  position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at center, rgba(0, 229, 255, 0.06), transparent 70%);
  opacity: 0; transition: opacity 0.5s;
}
.product-icon { font-size: 2.5rem; margin-bottom: 16px; }
.product-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.product-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }
.product-tag {
  display: inline-block; margin-top: 16px; padding: 4px 12px; border-radius: 50px;
  font-size: 0.75rem; font-weight: 600;
  background: var(--primary-dim); color: var(--primary);
}
.product-card--coming { opacity: 0.5; cursor: default; }
.product-card--coming:hover { transform: none; border-color: var(--border); }

/* ========== CTA BANNER ========== */
.cta-banner {
  position: relative; z-index: 1; padding: 80px 24px; overflow: hidden;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(123, 47, 255, 0.08));
}
.cta-glow {
  position: absolute; width: 300px; height: 300px; border-radius: 50%;
  filter: blur(100px); opacity: 0.2;
  background: var(--primary); top: 50%; left: 80%; transform: translate(-50%, -50%);
}
.cta-content { text-align: center; position: relative; z-index: 1; }
.cta-content h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 900; margin-bottom: 12px; }
.cta-content p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 32px; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ========== PAGE SYSTEM ========== */
.page { display: none; }
.page.active { display: block; }
.page-hero {
  padding: 140px 24px 60px; text-align: center;
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.05), transparent);
}
.page-hero h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 900; margin-bottom: 12px; }
.page-hero p { color: var(--text-secondary); font-size: 1.1rem; }
.page-content { padding: 40px 24px 80px; }

/* ========== PROCESS FLOW ========== */
.process-flow {
  display: flex; align-items: center; justify-content: center; gap: 24px;
  flex-wrap: wrap; margin-bottom: 80px;
}
.process-node {
  padding: 20px 32px; border-radius: var(--radius); background: var(--bg-card);
  border: 1px solid var(--border); position: relative; font-weight: 700; font-size: 0.95rem;
}
.pulse-ring {
  position: absolute; inset: -4px; border-radius: inherit; border: 1px solid var(--primary);
  animation: pulseRing 2s infinite;
}
@keyframes pulseRing {
  0%, 100% { inset: -4px; opacity: 0.5; }
  50% { inset: -10px; opacity: 0; }
}
.process-arrow { font-size: 1.5rem; color: var(--primary); }

/* ========== LEVELS ========== */
.execution-levels h2 { text-align: center; font-size: 1.8rem; font-weight: 900; margin-bottom: 40px; }
.levels-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.level-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 36px 28px; text-align: center;
}
.level-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.level-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 20px; }
.level-bar { height: 4px; background: var(--border); border-radius: 2px; margin-bottom: 8px; overflow: hidden; }
.level-bar div { height: 100%; border-radius: 2px; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.level-card span { font-size: 0.8rem; color: var(--text-tertiary); }

/* ========== FILTER BAR ========== */
.filter-bar { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-btn {
  padding: 8px 20px; border-radius: 50px; font-size: 0.85rem; font-weight: 600;
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text-secondary);
  cursor: pointer; transition: var(--transition); font-family: inherit;
}
.filter-btn.active, .filter-btn:hover { background: var(--primary-dim); color: var(--primary); border-color: var(--border-glow); }

/* ========== CONTRIBUTOR BENEFITS ========== */
.contributor-benefits {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 80px;
}
.benefit-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 24px; text-align: center; transition: var(--transition);
}
.benefit-card:hover { border-color: var(--border-glow); transform: translateY(-2px); }
.benefit-icon { font-size: 2.5rem; margin-bottom: 16px; }
.benefit-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.benefit-card p { color: var(--text-secondary); font-size: 0.9rem; }
.contributor-cta { text-align: center; padding: 60px; background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); }
.contributor-cta h2 { font-size: 1.8rem; font-weight: 900; margin-bottom: 12px; }
.contributor-cta p { color: var(--text-secondary); margin-bottom: 24px; }

/* ========== ABOUT ========== */
.about-section { margin-bottom: 60px; }
.about-section h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 16px; color: var(--primary); }
.about-section p { color: var(--text-secondary); font-size: 1rem; line-height: 1.8; max-width: 800px; }
.revenue-model { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 24px; }
.revenue-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px 24px; text-align: center;
}
.revenue-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.revenue-card p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 8px; }
.revenue-card span { font-size: 0.85rem; color: var(--accent); font-weight: 600; }

/* ========== MODAL ========== */
.modal { display: none; position: fixed; inset: 0; z-index: 2000; align-items: center; justify-content: center; }
.modal.active { display: flex; }
.modal-overlay { position: absolute; inset: 0; background: rgba(6, 6, 11, 0.8); backdrop-filter: blur(8px); }
.modal-content {
  position: relative; z-index: 1; width: 420px; max-width: 90vw;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 40px 32px;
}
.modal-close {
  position: absolute; top: 16px; right: 16px; background: none; border: none;
  color: var(--text-secondary); font-size: 1.5rem; cursor: pointer; transition: var(--transition);
}
.modal-close:hover { color: var(--primary); }
.auth-tabs { display: flex; gap: 0; margin-bottom: 28px; border-bottom: 1px solid var(--border); }
.auth-tab {
  flex: 1; padding: 12px; background: none; border: none; color: var(--text-secondary);
  font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: var(--transition);
  font-family: inherit; border-bottom: 2px solid transparent;
}
.auth-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.auth-form { display: none; flex-direction: column; gap: 20px; }
.auth-form.active { display: flex; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); }
.form-group input {
  padding: 12px 16px; border-radius: 8px; background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border); color: var(--text-primary); font-size: 0.9rem;
  font-family: inherit; transition: var(--transition);
}
.form-group input:focus { outline: none; border-color: var(--primary); background: rgba(0, 229, 255, 0.05); }

/* ========== FOOTER ========== */
.footer { position: relative; z-index: 1; background: rgba(13, 13, 26, 0.8); border-top: 1px solid var(--border); padding: 60px 24px 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand h3 { font-size: 1.4rem; font-weight: 900; margin-bottom: 8px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; }
.footer-links h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 16px; }
.footer-links a { display: block; color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 8px; transition: var(--transition); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom { text-align: center; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--text-tertiary); font-size: 0.85rem; }

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .nav-menu { display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: rgba(6, 6, 11, 0.98); flex-direction: column; padding: 20px; gap: 16px;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu.active { display: flex; }
  .nav-toggle { display: flex; }

  .steps-grid, .product-grid, .levels-grid, .contributor-benefits, .revenue-model { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 24px; padding: 20px; }
  .hero-stat .stat-num { font-size: 1.5rem; }
  .process-flow { flex-direction: column; }
  .process-arrow { transform: rotate(90deg); }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .page-hero { padding: 120px 24px 40px; }
}

/* ========== CATEGORY CARDS (产品超市) ========== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}
.category-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 229, 255, 0.08);
}
.category-card:hover .category-card-glow { opacity: 1; }
.category-card-glow {
  position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at center, rgba(0, 229, 255, 0.05), transparent 70%);
  opacity: 0; transition: opacity 0.5s; pointer-events: none;
}
.category-icon { font-size: 2.8rem; margin-bottom: 16px; }
.category-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.category-card p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.6; flex: 1; }
.category-count {
  display: inline-block; margin-top: 16px; padding: 4px 12px; border-radius: 50px;
  font-size: 0.78rem; font-weight: 600;
  background: var(--primary-dim); color: var(--primary);
  width: fit-content;
}
.category-arrow {
  position: absolute; bottom: 28px; right: 28px;
  font-size: 1.2rem; color: var(--primary); opacity: 0;
  transition: var(--transition);
}
.category-card:hover .category-arrow { opacity: 1; right: 20px; }

/* ========== SUB-PRODUCT CARDS (分类子页面) ========== */
.sub-product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.sub-product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  transition: var(--transition);
}
.sub-product-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}
.sub-product-card .sp-icon { font-size: 2rem; margin-bottom: 12px; }
.sub-product-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.sub-product-card p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.6; }
.sub-product-card .coming-soon-tag {
  display: inline-block; margin-top: 14px; padding: 4px 12px; border-radius: 50px;
  font-size: 0.75rem; font-weight: 600;
  background: rgba(123, 47, 255, 0.15); color: var(--secondary);
}

/* ========== SUB PAGE HEADER ========== */
.sub-page {
  min-height: 100vh;
  background: var(--bg-deep);
}
.sub-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(6, 6, 11, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px; height: 72px;
  display: flex; align-items: center; gap: 16px;
}
.sub-nav .back-btn {
  display: flex; align-items: center; gap: 8px;
  background: none; border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 16px; color: var(--text-secondary); font-size: 0.9rem; font-weight: 600;
  cursor: pointer; transition: var(--transition); font-family: inherit;
}
.sub-nav .back-btn:hover { border-color: var(--primary); color: var(--primary); }
.sub-nav .sub-nav-title {
  font-size: 1.1rem; font-weight: 700; color: var(--primary);
}
.sub-page .page-hero { padding: 120px 24px 40px; }
.sub-page .page-content { padding: 20px 24px 60px; }