/* FHQ 防火墙落地页 - 蓝白专业风格 */
:root {
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 12px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--gray-800);
  line-height: 1.6;
  background: #fff;
}

a { color: var(--blue-600); text-decoration: none; }
a:hover { color: var(--blue-700); }

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

/* Header */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gray-200);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 700; color: var(--blue-700);
}
.logo svg { width: 32px; height: 32px; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: var(--gray-600); font-size: 0.9375rem; font-weight: 500; transition: color 0.2s; }
.nav a:hover { color: var(--blue-600); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: 8px; font-size: 0.9375rem; font-weight: 600;
  border: none; cursor: pointer; transition: all 0.2s; text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
  color: #fff; box-shadow: 0 4px 14px rgb(37 99 235 / 0.35);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--blue-700), var(--blue-800)); color: #fff; transform: translateY(-1px); }
.btn-outline {
  background: #fff; color: var(--blue-600);
  border: 2px solid var(--blue-200);
}
.btn-outline:hover { background: var(--blue-50); border-color: var(--blue-500); color: var(--blue-700); }
.btn-sm { padding: 8px 16px; font-size: 0.875rem; }

/* Hero */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--blue-50) 0%, #fff 100%);
}
.hero-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.hero-badge {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: var(--blue-100); color: var(--blue-700);
  font-size: 0.8125rem; font-weight: 600; margin-bottom: 20px;
}
.hero h1 {
  font-size: 2.75rem; font-weight: 800; line-height: 1.2;
  color: var(--gray-900); margin-bottom: 20px;
}
.hero h1 span { color: var(--blue-600); }
.hero-desc {
  font-size: 1.125rem; color: var(--gray-600); margin-bottom: 32px; max-width: 520px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; }

/* Hero 一键安装 */
.hero-install { margin-bottom: 28px; max-width: 560px; }
.hero-install-label {
  font-size: 0.875rem; font-weight: 600; color: var(--gray-700); margin-bottom: 10px;
}
.hero-install-note {
  margin-top: 10px; font-size: 0.75rem; color: var(--gray-500);
}
.hero-install-note code {
  background: var(--gray-100); padding: 1px 5px; border-radius: 4px; font-size: 0.6875rem;
}

/* Install tabs */
.install-tabs-wrap { width: 100%; }
.install-tabs {
  display: flex; gap: 4px; margin-bottom: 0;
  border-bottom: 2px solid var(--gray-200);
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: thin; scrollbar-color: var(--blue-200) transparent;
}
.install-tabs::-webkit-scrollbar { height: 4px; }
.install-tabs::-webkit-scrollbar-thumb { background: var(--blue-200); border-radius: 4px; }
.install-tab {
  flex: 0 0 auto; padding: 10px 16px;
  background: transparent; border: none; border-bottom: 2px solid transparent;
  margin-bottom: -2px; color: var(--gray-600);
  font-size: 0.8125rem; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: color 0.2s, border-color 0.2s, background 0.2s;
  border-radius: 6px 6px 0 0;
}
.install-tab:hover { color: var(--blue-600); background: var(--blue-50); }
.install-tab.active {
  color: var(--blue-700); border-bottom-color: var(--blue-600);
  background: var(--blue-50);
}
.install-tab:focus-visible { outline: 2px solid var(--blue-400); outline-offset: -2px; }
.install-panels {
  position: relative; min-height: 80px;
  background: var(--gray-900); border-radius: 0 0 8px 8px;
  padding: 16px; box-shadow: 0 4px 12px rgb(0 0 0 / 0.12);
}
.install-panel {
  opacity: 0; visibility: hidden; height: 0; overflow: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.install-panel.active {
  opacity: 1; visibility: visible; height: auto; overflow: visible;
}
.install-panel .install-cmd { margin-bottom: 12px; }
.install-panel .install-cmd:last-child { margin-bottom: 0; }
.install-panels .install-cmd {
  background: rgba(255, 255, 255, 0.06); border-radius: 6px;
  padding: 14px 80px 14px 16px; margin-bottom: 0;
}
.install-panels .install-cmd + .install-cmd { margin-top: 10px; }
.hero-install .install-tabs-wrap { max-width: 100%; }
.hero-install .install-tab { font-size: 0.75rem; padding: 8px 12px; }

.hero-stats { display: flex; gap: 32px; }
.stat-item { text-align: left; }
.stat-num { font-size: 1.5rem; font-weight: 700; color: var(--blue-700); }
.stat-label { font-size: 0.8125rem; color: var(--gray-500); }

.hero-visual {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  border-radius: 16px; padding: 32px; color: #fff;
  box-shadow: var(--shadow-lg);
}
.hero-visual-header {
  display: flex; align-items: center; gap: 8px; margin-bottom: 24px;
  padding-bottom: 16px; border-bottom: 1px solid rgba(255,255,255,0.2);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #f87171; }
.dot-y { background: #fbbf24; }
.dot-g { background: #4ade80; }
.hero-visual-title { margin-left: 8px; font-size: 0.875rem; opacity: 0.9; }
.mini-dashboard { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.mini-card {
  background: rgba(255,255,255,0.12); border-radius: 8px; padding: 16px;
  backdrop-filter: blur(4px);
}
.mini-card .label { font-size: 0.75rem; opacity: 0.8; margin-bottom: 4px; }
.mini-card .value { font-size: 1.25rem; font-weight: 700; }

/* Sections */
section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 2rem; font-weight: 700; color: var(--gray-900); margin-bottom: 12px; }
.section-header p { font-size: 1.0625rem; color: var(--gray-500); max-width: 600px; margin: 0 auto; }
.section-alt { background: var(--gray-50); }

/* Features */
.features-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-card {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 28px 24px; transition: all 0.25s;
}
.feature-card:hover {
  border-color: var(--blue-200); box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.feature-icon {
  width: 48px; height: 48px; border-radius: 10px;
  background: var(--blue-50); color: var(--blue-600);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px; font-size: 1.5rem;
}
.feature-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; color: var(--gray-900); }
.feature-card p { font-size: 0.875rem; color: var(--gray-500); line-height: 1.5; }

/* Architecture */
.arch-diagram {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 40px; max-width: 800px; margin: 0 auto;
}
.arch-row { display: flex; align-items: center; justify-content: center; gap: 24px; flex-wrap: wrap; }
.arch-box {
  border: 2px solid var(--blue-200); border-radius: var(--radius);
  padding: 20px 28px; text-align: center; min-width: 160px;
  background: var(--blue-50);
}
.arch-box.primary {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
  border-color: var(--blue-600); color: #fff;
}
.arch-box h4 { font-size: 0.9375rem; font-weight: 600; margin-bottom: 4px; }
.arch-box p { font-size: 0.75rem; opacity: 0.8; }
.arch-arrow { font-size: 1.5rem; color: var(--blue-400); }
.arch-clients { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; margin-top: 24px; }
.arch-client {
  border: 1px dashed var(--blue-300); border-radius: 8px;
  padding: 12px 20px; font-size: 0.8125rem; color: var(--gray-600);
  background: #fff;
}

/* One-click install */
.install-box {
  max-width: 800px; margin: 0 auto;
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 32px;
}
.install-note {
  font-size: 0.875rem; color: var(--gray-500); margin-bottom: 24px;
}
.install-note code {
  background: var(--gray-100); padding: 2px 6px; border-radius: 4px;
  font-size: 0.8125rem;
}
.install-cmd {
  position: relative; margin-bottom: 16px;
  background: var(--gray-900); border-radius: 8px; padding: 14px 80px 14px 16px;
}
.install-cmd-label {
  font-size: 0.75rem; color: #9ca3af; margin-bottom: 6px;
  font-weight: 600; letter-spacing: 0.03em;
}
.install-cmd code {
  display: block; color: #a5f3fc; font-size: 0.8125rem;
  font-family: "Consolas", "Monaco", monospace; word-break: break-all;
  background: none; padding: 0;
}
.btn-copy {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: var(--blue-600); color: #fff; border: none; border-radius: 6px;
  padding: 6px 14px; font-size: 0.75rem; cursor: pointer; font-weight: 600;
  transition: background 0.2s;
}
.btn-copy:hover { background: var(--blue-700); }
.btn-copy.copied { background: #16a34a; }
.btn-copy:focus-visible { outline: 2px solid var(--blue-400); outline-offset: 2px; }

/* 复制成功 Toast */
.copy-toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--gray-900); color: #fff; padding: 10px 20px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 500; z-index: 1000; opacity: 0;
  pointer-events: none; transition: opacity 0.25s, transform 0.25s;
  box-shadow: var(--shadow-lg);
}
.copy-toast.show {
  opacity: 1; transform: translateX(-50%) translateY(0);
}
.install-hint {
  margin-top: 20px; font-size: 0.8125rem; color: var(--gray-500);
}
.install-hint code {
  background: var(--gray-100); padding: 2px 6px; border-radius: 4px;
}

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.step {
  text-align: center; position: relative;
}
.step-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
  color: #fff; font-size: 1.25rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
}
.step h3 { font-size: 1.0625rem; font-weight: 600; margin-bottom: 8px; }
.step p { font-size: 0.875rem; color: var(--gray-500); }
.step code {
  display: block; margin-top: 12px; padding: 10px 14px;
  background: var(--gray-900); color: #e5e7eb; border-radius: 8px;
  font-size: 0.8125rem; text-align: left; overflow-x: auto;
}

/* Download */
.download-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.download-card {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 32px; transition: border-color 0.2s;
}
.download-card:hover { border-color: var(--blue-300); }
.download-card h3 {
  font-size: 1.25rem; font-weight: 700; margin-bottom: 8px;
  display: flex; align-items: center; gap: 10px;
}
.download-card .tag {
  font-size: 0.75rem; padding: 2px 8px; border-radius: 4px;
  background: var(--blue-100); color: var(--blue-700); font-weight: 600;
}
.download-card p { font-size: 0.875rem; color: var(--gray-500); margin-bottom: 20px; }
.file-list { list-style: none; margin-bottom: 24px; }
.file-list li {
  font-size: 0.8125rem; color: var(--gray-600); padding: 6px 0;
  border-bottom: 1px solid var(--gray-100);
  font-family: "Consolas", "Monaco", monospace;
}
.file-list li:last-child { border-bottom: none; }

/* Requirements */
.req-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.req-item {
  text-align: center; padding: 24px;
  background: #fff; border-radius: var(--radius); border: 1px solid var(--gray-200);
}
.req-item .icon { font-size: 2rem; margin-bottom: 12px; }
.req-item h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.req-item p { font-size: 0.8125rem; color: var(--gray-500); }

/* Footer */
.footer {
  background: var(--gray-900); color: var(--gray-400);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 32px;
}
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 0.875rem; line-height: 1.6; }
.footer h4 { color: #fff; font-size: 0.9375rem; margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: var(--gray-400); font-size: 0.875rem; }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid var(--gray-700); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.8125rem;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .req-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .hero h1 { font-size: 2rem; }
}

@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .install-tab { font-size: 0.75rem; padding: 8px 10px; }
  .install-panels .install-cmd {
    padding-right: 16px; padding-bottom: 48px;
  }
  .install-panels .btn-copy {
    top: auto; bottom: 10px; right: 10px; transform: none;
    width: calc(100% - 20px); padding: 8px 14px; font-size: 0.8125rem;
  }
  .install-panels .install-cmd code { font-size: 0.75rem; }
}

.download-stats {
  margin-top: 12px;
  font-size: 0.9375rem;
  color: var(--primary);
}
.download-stats strong { font-size: 1.125rem; }
.nav-version {
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--primary-light, #e8f0fe);
  color: var(--primary);
  font-size: 0.8125rem;
}