/* Xshell Download Site - Common Styles */

:root {
  --primary: #0ea5e9;
  --primary-dark: #0284c7;
  --accent: #10b981;
  --accent-dark: #059669;
  --dark: #0f172a;
  --darker: #020617;
  --dark-card: #1e293b;
  --dark-card-hover: #334155;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-bright: #f8fafc;
  --border: #334155;
  --gradient-start: #0ea5e9;
  --gradient-end: #10b981;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  background: var(--darker);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-bright);
}

.logo img { width: 32px; height: 32px; border-radius: 4px; }

.logo span { background: linear-gradient(90deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.main-nav { display: flex; gap: 8px; }

.main-nav a {
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s;
}

.main-nav a:hover, .main-nav a.active {
  color: var(--text-bright);
  background: var(--dark-card);
}

.download-btn {
  background: linear-gradient(135deg, var(--primary), var(--accent)) !important;
  color: white !important;
  padding: 8px 20px !important;
  border-radius: 8px !important;
  font-weight: 600;
}

.download-btn:hover {
  opacity: 0.9;
  color: white !important;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 100%);
  padding: 80px 0 60px;
}

.hero-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  opacity: 0.15;
  background-size: cover;
  background-position: center;
  pointer-events: none;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-bright);
  margin-bottom: 16px;
}

.hero-title .highlight {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 32px;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background: var(--dark-card);
  color: var(--text-bright);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--dark-card-hover);
  border-color: var(--primary);
}

.hero-meta {
  display: flex;
  gap: 24px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.hero-meta-item .icon { color: var(--accent); }

/* Sections */
.section { padding: 60px 0; }

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 12px;
}

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

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.2s;
}

.card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.card-icon.blue { background: rgba(14, 165, 233, 0.15); color: var(--primary); }
.card-icon.green { background: rgba(16, 185, 129, 0.15); color: var(--accent); }
.card-icon.orange { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.card-icon.red { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.card-icon.purple { background: rgba(139, 92, 246, 0.15); color: #8b5cf6; }
.card-icon.teal { background: rgba(20, 184, 166, 0.15); color: #14b8a6; }

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.card-text { color: var(--text-dim); font-size: 0.95rem; line-height: 1.6; }

/* Feature highlight */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.feature-img {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}

.feature-list { display: flex; flex-direction: column; gap: 16px; }

.feature-list-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.feature-list-item .check {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-list-item .text { font-size: 0.95rem; color: var(--text-dim); }

.feature-list-item .text strong { color: var(--text-bright); display: block; margin-bottom: 2px; }

/* Version badge / info */
.version-bar {
  background: linear-gradient(90deg, var(--dark-card), var(--darker));
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.version-bar .version-info { display: flex; align-items: center; gap: 12px; }

.version-bar .version-tag {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 700;
}

.version-bar .version-details { color: var(--text-dim); font-size: 0.9rem; }

/* Download table */
.download-table-wrap {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.download-table { width: 100%; border-collapse: collapse; }
.download-table th, .download-table td { padding: 14px 20px; text-align: left; }
.download-table th { background: var(--darker); color: var(--text-dim); font-size: 0.85rem; font-weight: 600; text-transform: uppercase; }
.download-table td { border-top: 1px solid var(--border); font-size: 0.95rem; }
.download-table tr:hover td { background: rgba(14, 165, 233, 0.05); }
.download-table .file-name { color: var(--text-bright); font-weight: 600; }
.download-table .file-size { color: var(--text-dim); font-size: 0.85rem; }
.download-table .file-date { color: var(--text-dim); font-size: 0.85rem; }
.download-table .dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid var(--primary);
  color: var(--primary);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s;
}
.download-table .dl-btn:hover { background: var(--primary); color: white; }

/* Tutorial cards */
.tutorial-card {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.2s;
}

.tutorial-card:hover { border-color: var(--primary); transform: translateY(-2px); }

.tutorial-card-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.tutorial-card-num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.tutorial-card-title { font-size: 1.1rem; font-weight: 600; color: var(--text-bright); }

.tutorial-card-body { padding: 20px 24px; }

.tutorial-card-body p { color: var(--text-dim); font-size: 0.95rem; margin-bottom: 12px; }

.tutorial-card-body ul { list-style: none; padding: 0; }

.tutorial-card-body li {
  position: relative;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.tutorial-card-body li::before {
  content: '';
  position: absolute;
  left: 0; top: 8px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary);
}

/* FAQ */
.faq-item {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--text-bright);
  transition: background 0.2s;
}

.faq-question:hover { background: var(--dark-card-hover); }

.faq-answer {
  padding: 0 20px 16px;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
  display: none;
}

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

/* Footer */
.site-footer {
  background: var(--darker);
  border-top: 1px solid var(--border);
  padding: 40px 0 20px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.footer-col h4 {
  color: var(--text-bright);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-dim); font-size: 0.9rem; }
.footer-col a:hover { color: var(--primary); }

.footer-disclaimer {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-disclaimer p { margin-bottom: 8px; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-top: 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .hero { padding: 50px 0 40px; }
  .feature-row { grid-template-columns: 1fr; gap: 24px; }
  .header-inner { height: 56px; }
  .main-nav a { padding: 6px 10px; font-size: 0.85rem; }
  .card-grid { grid-template-columns: 1fr; }
  .version-bar { flex-direction: column; align-items: flex-start; }
  .download-table-wrap { overflow-x: auto; }
  .download-table { min-width: 600px; }
  .section { padding: 40px 0; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--darker); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--dark-card-hover); }

/* ========== QR Code Breathing Effect ========== */
@keyframes qrBreath {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(14, 165, 233, 0.4),
                0 0 0 0 rgba(16, 185, 129, 0.2);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(14, 165, 233, 0),
                0 0 0 16px rgba(16, 185, 129, 0);
    transform: scale(1.02);
  }
}

.qr-breathing {
  animation: qrBreath 3s ease-in-out infinite;
  border-radius: 12px;
  border: 2px solid var(--primary);
}

/* ========== Download Modal ========== */
.download-modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.download-modal-overlay.active {
  display: flex;
}

.download-modal {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
}

.modal-close {
  position: absolute;
  top: 12px; right: 16px;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--darker);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  z-index: 10;
}

.modal-close:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.modal-body {
  padding: 32px;
}

.modal-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-bright);
  text-align: center;
  margin-bottom: 24px;
}

.modal-content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.modal-info-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-info-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.modal-info-item .info-icon {
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.modal-qr-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.modal-qr-container {
  padding: 8px;
  background: white;
  border-radius: 12px;
  display: inline-block;
}

.modal-qr-container img {
  width: 150px;
  height: 150px;
  display: block;
}

.modal-qr-tip {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.5;
}

.modal-qr-tip strong {
  color: var(--text-bright);
}

.modal-warning {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 8px;
  padding: 12px 16px;
  margin-top: 20px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.modal-warning .warn-icon {
  color: var(--warning);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.modal-warning p {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0;
}

.modal-footer {
  border-top: 1px solid var(--border);
  padding: 16px 32px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.modal-footer .modal-btn {
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.modal-footer .modal-btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
}

.modal-footer .modal-btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.modal-footer .modal-btn-secondary {
  background: var(--darker);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.modal-footer .modal-btn-secondary:hover {
  border-color: var(--primary);
  color: var(--text-bright);
}

@media (max-width: 480px) {
  .modal-content-grid {
    grid-template-columns: 1fr;
  }
  .modal-body { padding: 24px 20px; }
  .modal-footer { padding: 16px 20px; }
}