/* ==========================================================================
   狗子云 GZCloud - Standard Design System & Master Stylesheet
   Domain: gzcloud.cyou
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-dark: #090d16;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --bg-glass: rgba(15, 23, 42, 0.65);
  
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.25);
  
  --accent-cyan: #06b6d4;
  --accent-purple: #818cf8;
  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border: rgba(255, 255, 255, 0.08);
  --border-light: rgba(56, 189, 248, 0.2);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", Monaco, Consolas, monospace;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.3);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Basic Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(circle at 50% 0%, #1e293b 0%, #090d16 70%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 100 100'%3E%3Cg fill='%2338bdf8' fill-opacity='0.035'%3E%3C!-- Paw Print Top Left --%3E%3Cpath d='M22 38c-3.3 0-6-4.5-6-10s2.7-10 6-10 6 4.5 6 10-2.7 10-6 10zm18-8c-3.3 0-6-4.5-6-10s2.7-10 6-10 6 4.5 6 10-2.7 10-6 10zm18 8c-3.3 0-6-4.5-6-10s2.7-10 6-10 6 4.5 6 10-2.7 10-6 10zm-27 32c0-10 8-15 9-15s9 5 9 15c0 6-4 10-9 10s-9-4-9-10z'/%3E%3C/g%3E%3C/svg%3E");
  background-repeat: repeat;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: #7dd3fc;
}

ul {
  list-style: none;
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
  position: relative;
}

.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Badges & Buttons */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--primary);
  margin-bottom: 1rem;
}

.badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(2, 132, 199, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.6);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-main);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.5);
  color: #ffffff;
}

.btn-sm {
  padding: 0.5rem 1.1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 1.1rem 2.5rem;
  font-size: 1.125rem;
  border-radius: var(--radius-md);
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition);
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding-top: 10rem;
  padding-bottom: 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 650px;
  height: 650px;
  background: 
    radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, rgba(0, 0, 0, 0) 70%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300' viewBox='0 0 100 100'%3E%3Cpath fill='%2338bdf8' fill-opacity='0.03' d='M25 45c-4 0-7-5-7-11s3-11 7-11 7 5 7 11-3 11-7 11zm25-10c-4 0-7-5-7-11s3-11 7-11 7 5 7 11-3 11-7 11zm25 10c-4 0-7-5-7-11s3-11 7-11 7 5 7 11-3 11-7 11zm-38 35c0-12 10-18 13-18s13 6 13 18c0 7-5 12-13 12s-13-5-13-12z'/%3E%3C/svg%3E") center center / contain no-repeat;
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 2.5rem auto;
}

.hero-btns {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Feature Grid */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem auto;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2.2rem;
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-light);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card.popular {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.08) 0%, rgba(17, 24, 39, 0.8) 100%);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.15);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.3rem 1.2rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  min-height: 40px;
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.plan-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.plan-features {
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.plan-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* Articles Section */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.article-tag {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.article-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-excerpt {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

/* Reviews & FAQ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  position: relative;
}

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

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.user-info h4 {
  font-size: 1rem;
  font-weight: 600;
}

.user-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.stars {
  color: var(--accent-gold);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.925rem;
}

.faq-list {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  padding: 1.4rem 1.8rem;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-answer {
  padding: 0 1.8rem 1.4rem 1.8rem;
  color: var(--text-muted);
  font-size: 0.975rem;
  display: none;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-icon {
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

/* Footer & PBN Links (Core Task 2) */
.footer {
  background: #05070d;
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

.footer-top {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  text-align: left;
  margin-bottom: 3rem;
}

.footer-col h3 {
  color: var(--text-main);
  font-size: 1.1rem;
  margin-bottom: 1.2rem;
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col ul li a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-col ul li a:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

/* PBN Friendly Links Styling - Low key, clean, seamless */
.friend-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.friend-links span {
  color: var(--text-dim);
}

.friend-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Article Page Container & Typography */
.article-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 8rem 1.5rem 5rem 1.5rem;
}

.article-header {
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2rem;
}

.article-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1.2rem;
}

.article-body {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.75rem;
  color: var(--text-main);
  margin: 2.5rem 0 1.2rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.article-body h3 {
  font-size: 1.35rem;
  color: var(--primary);
  margin: 2rem 0 1rem 0;
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: var(--bg-card);
  padding: 1.2rem 1.5rem;
  margin: 1.8rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-muted);
}

.article-nav {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .hero-title { font-size: 2.75rem; }
  .nav-menu { display: none; }
  .mobile-toggle { display: block; }
  
  .nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #090d16;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 640px) {
  .hero-title { font-size: 2.1rem; }
  .hero-subtitle { font-size: 1rem; }
  .btn-lg { width: 100%; }
  .hero-btns { flex-direction: column; width: 100%; }
}