/* ===== 变量 ===== */
:root {
  --bg: #0b1020;
  --bg2: #10182e;
  --ink: #f2f5fb;
  --muted: #9aa5bf;
  --rule: #1d2847;
  --accent: #ff7a2f;
  --accent2: #3aa3ff;
  --accent-glow: rgba(255,122,47,0.35);
  --accent2-glow: rgba(58,163,255,0.35);
  --card-bg: #0f1728;
  --card-border: #1a2540;
  --success: #2dd36f;
  --danger: #ff4d4d;
  --warning: #ffc107;
  --slider-track: #1d2847;
  --slider-thumb: #ff7a2f;
  --input-bg: #0a0f1f;
  --input-border: #253354;
  --nav-height: 57px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  font-size: 14px;
}

/* ===== 背景装饰 ===== */
.bg-deco {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.bg-deco .orbit {
  position: absolute;
  border: 1px solid rgba(58,163,255,0.06);
  border-radius: 50%;
}
.bg-deco .orbit-1 { width: 700px; height: 700px; top: -250px; right: -200px; }
.bg-deco .orbit-2 { width: 450px; height: 450px; top: 60px; right: -80px; }
.bg-deco .orbit-3 { width: 1000px; height: 1000px; bottom: -500px; left: -400px; border-color: rgba(255,122,47,0.05); }
.bg-deco .dot {
  position: absolute;
  width: 2px; height: 2px;
  background: var(--accent2);
  border-radius: 50%;
  opacity: 0.35;
}

/* ===== 布局 ===== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ===== 顶部导航 ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 16, 32, 0.85);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--rule);
  padding: 12px 0;
  transition: box-shadow 0.3s, background 0.3s;
}
.topbar.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
  background: rgba(11, 16, 32, 0.92);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}
.topbar-logo .logo-icon {
  width: 30px; height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 7px;
  color: var(--bg);
  font-size: 15px;
  font-weight: 800;
}
.topbar-nav {
  display: flex;
  gap: 4px;
  align-items: center;
  flex: 1;
  justify-content: center;
}
.topbar-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 0.82rem;
  transition: all 0.2s;
  white-space: nowrap;
  position: relative;
}
.topbar-nav a:hover {
  color: var(--ink);
  background: rgba(255,255,255,0.06);
}
.topbar-nav a.active {
  color: var(--accent);
  background: rgba(255,122,47,0.1);
}
.topbar-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}
.topbar-badge {
  font-size: 0.72rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 4px 12px;
  border-radius: 4px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  flex-shrink: 0;
}

/* 移动端菜单按钮 */
.topbar-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  padding: 0;
  flex-shrink: 0;
}
.topbar-menu-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: all 0.3s;
}
.topbar-menu-btn.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.topbar-menu-btn.open span:nth-child(2) {
  opacity: 0;
}
.topbar-menu-btn.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse at center, rgba(255,122,47,0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}
.hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--ink) 0%, var(--accent2) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
  font-weight: 300;
}
.hero .tagline {
  font-size: 0.95rem;
  color: var(--accent2);
  max-width: 680px;
  margin: 0 auto 28px;
  padding: 14px 22px;
  border-left: 3px solid var(--accent2);
  background: rgba(58,163,255,0.06);
  text-align: left;
  display: inline-block;
  border-radius: 0 8px 8px 0;
  line-height: 1.7;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--accent), #ff9a3f);
  color: var(--bg);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: all 0.3s;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px var(--accent-glow);
}
.hero-cta .arrow {
  transition: transform 0.3s;
}
.hero-cta:hover .arrow {
  transform: translateX(4px);
}

/* 滚动指示器 */
.scroll-indicator {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  animation: floatDown 2s ease-in-out infinite;
}
.scroll-indicator .scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--muted), transparent);
}
@keyframes floatDown {
  0%, 100% { transform: translateY(0); opacity: 0.8; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* ===== 模块区域通用 ===== */
.module-section {
  padding: 50px 0;
  scroll-margin-top: calc(var(--nav-height) + 10px);
}
.module-header {
  margin-bottom: 28px;
}
.module-num {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.module-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.module-desc {
  font-size: 0.9rem;
  color: var(--muted);
  max-width: 700px;
  line-height: 1.7;
}

.module-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  overflow: hidden;
}
.module-body {
  padding: 24px;
}

/* 两列布局：左控制 + 右可视化 */
.module-split {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 24px;
  align-items: start;
}

/* ===== 控制面板 ===== */
.controls-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 22px;
}
.control-group {
  margin-bottom: 20px;
}
.control-group:last-child { margin-bottom: 0; }
.control-group-title {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

/* 滑块控件 */
.slider-row {
  margin-bottom: 16px;
}
.slider-row:last-child { margin-bottom: 0; }
.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  margin-bottom: 8px;
}
.slider-label .name { color: var(--muted); }
.slider-label .value {
  color: var(--ink);
  font-weight: 600;
  font-family: 'SF Mono', Consolas, monospace;
  font-size: 0.8rem;
}
.slider-label .value .unit {
  color: var(--muted);
  font-weight: 400;
  margin-left: 3px;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--slider-track);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
  transition: transform 0.15s, box-shadow 0.15s;
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 14px var(--accent-glow);
}
input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.05);
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 8px var(--accent-glow);
}
input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: var(--slider-track);
}

/* 数字输入 */
.num-input {
  display: flex;
  align-items: center;
  gap: 8px;
}
.num-input input {
  width: 80px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--ink);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.82rem;
  font-family: 'SF Mono', Consolas, monospace;
  text-align: right;
}
.num-input input:focus {
  outline: none;
  border-color: var(--accent);
}
.num-input .unit {
  font-size: 0.75rem;
  color: var(--muted);
}

/* 选择器 */
.select-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.select-row .name {
  font-size: 0.82rem;
  color: var(--muted);
  flex-shrink: 0;
}
.select-row select {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--ink);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.82rem;
  cursor: pointer;
}
.select-row select:focus { outline: none; border-color: var(--accent); }

/* 分段按钮 */
.segmented {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 14px;
}
.segmented button {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 8px 0;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
}
.segmented button.active {
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
}
.segmented button:hover:not(.active) {
  color: var(--ink);
  background: rgba(255,255,255,0.04);
}

/* ===== 可视化区域 ===== */
.visual-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  overflow: hidden;
  min-height: 420px;
  position: relative;
}
.visual-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.visual-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
}
.visual-badges {
  display: flex;
  gap: 8px;
}
.visual-badge {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(58,163,255,0.1);
  color: var(--accent2);
  border: 1px solid rgba(58,163,255,0.2);
  letter-spacing: 0.03em;
}

.visual-content {
  padding: 18px;
  height: calc(100% - 49px);
  position: relative;
}
.chart-container {
  width: 100%;
  height: 100%;
  min-height: 360px;
}

/* ===== 数据指标卡片 ===== */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}
.metric-card {
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 14px 16px;
  transition: border-color 0.2s, transform 0.2s;
}
.metric-card:hover {
  border-color: var(--accent2);
  transform: translateY(-1px);
}
.metric-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 6px;
}
.metric-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  font-family: 'SF Mono', Consolas, monospace;
}
.metric-value .unit {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 400;
  margin-left: 4px;
}

/* ===== 模块一：火箭可视化 ===== */
.rocket-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  position: relative;
}
.rocket-svg-container {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.rocket-info-panel {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(11,16,32,0.85);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 0.78rem;
  min-width: 170px;
  backdrop-filter: blur(8px);
}
.rocket-info-panel .rip-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 5px;
}
.rocket-info-panel .rip-row:last-child { margin-bottom: 0; }
.rocket-info-panel .rip-divider {
  height: 1px;
  background: var(--rule);
  margin: 10px 0;
}
.rocket-info-panel .rip-label { color: var(--muted); }
.rocket-info-panel .rip-val {
  color: var(--ink);
  font-family: 'SF Mono', Consolas, monospace;
  font-weight: 600;
}

/* ===== 模块四：回收可视化堆叠 ===== */
.recovery-visual-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.recovery-visual-stack .visual-panel {
  min-height: auto;
}

.recovery-svg-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 300px;
}
.recovery-svg {
  width: 100%;
  height: 300px;
  max-height: 300px;
}

/* 播放按钮 */
.rec-play-btn {
  width: 100%;
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--accent), #ff9a3f);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}
.rec-play-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}
.rec-play-btn:active {
  transform: translateY(0);
}
.rec-play-btn.playing {
  background: linear-gradient(135deg, var(--accent2), #5ab4ff);
}

/* ===== 模块五：双列对比 ===== */
.compare-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}
.compare-panel {
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.compare-panel.fail {
  border-color: rgba(255,77,77,0.35);
  box-shadow: 0 2px 20px rgba(255,77,77,0.08);
}
.compare-panel.success {
  border-color: rgba(45,211,111,0.35);
  box-shadow: 0 2px 20px rgba(45,211,111,0.08);
}
.compare-panel-header {
  padding: 14px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: 0.02em;
}
.compare-panel.fail .compare-panel-header {
  color: var(--danger);
  background: rgba(255,77,77,0.06);
}
.compare-panel.success .compare-panel-header {
  color: var(--success);
  background: rgba(45,211,111,0.06);
}
.compare-panel-header::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.compare-panel.fail .compare-panel-header::before {
  background: var(--danger);
  box-shadow: 0 0 8px var(--danger);
  animation: pulse-dot 2s ease-in-out infinite;
}
.compare-panel.success .compare-panel-header::before {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}
.compare-panel-body {
  padding: 14px;
}
.compare-chart {
  width: 100%;
  height: 260px;
}
.compare-result {
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0,0,0,0.2);
}
.compare-result .label {
  color: var(--muted);
  font-size: 0.75rem;
}
.compare-result .value {
  font-weight: 600;
  font-family: 'SF Mono', Consolas, monospace;
}
.compare-panel.fail .compare-result .value { color: var(--danger); }
.compare-panel.success .compare-result .value { color: var(--success); }

.redundancy-info {
  margin-top: 16px;
  padding: 16px 20px;
  border-left: 3px solid var(--accent2);
  background: rgba(58,163,255,0.06);
  border-radius: 0 8px 8px 0;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
}
.redundancy-info strong {
  color: var(--accent2);
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
}

/* ===== 故障场景控制 ===== */
.fault-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 20px;
  padding: 18px 22px;
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 12px;
  align-items: center;
}
.fault-controls label {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 220px;
}
.fault-controls label .name {
  flex-shrink: 0;
  min-width: 72px;
}
.fault-controls label .val {
  flex-shrink: 0;
  min-width: 56px;
  text-align: right;
  font-family: 'SF Mono', Consolas, monospace;
  font-weight: 600;
  color: var(--ink);
  font-size: 0.85rem;
}
.fault-controls label .val .unit {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.75rem;
  margin-left: 2px;
}
.fault-controls input[type="range"] {
  flex: 1;
  min-width: 100px;
}

/* ===== 底部 ===== */
footer {
  text-align: center;
  padding: 28px 0 32px;
  color: var(--muted);
  font-size: 0.78rem;
  border-top: 1px solid var(--rule);
  margin-top: 20px;
}

/* ===== 响应式 ===== */

/* 大屏 1440px+ */
@media (min-width: 1600px) {
  .container {
    max-width: 1500px;
  }
  .module-split {
    grid-template-columns: 360px 1fr;
    gap: 28px;
  }
  .hero h1 {
    font-size: 3rem;
  }
}

/* 普通桌面 1280px */
@media (max-width: 1280px) {
  .container {
    max-width: 1200px;
    padding: 0 20px;
  }
  .module-split {
    grid-template-columns: 320px 1fr;
    gap: 20px;
  }
  .hero h1 {
    font-size: 2.3rem;
  }
}

/* 笔记本/小桌面 1024px */
@media (max-width: 1024px) {
  .module-split {
    grid-template-columns: 1fr;
  }
  .controls-panel {
    order: 2;
  }
  .visual-panel {
    order: 1;
    min-height: 380px;
  }
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .compare-split {
    grid-template-columns: 1fr;
  }
  .topbar-nav a {
    padding: 6px 10px;
    font-size: 0.78rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero {
    padding: 60px 0 40px;
  }
  .module-section {
    padding: 40px 0;
  }
}

/* 平板 768px */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .topbar-badge {
    display: none;
  }
  .topbar-nav {
    gap: 2px;
  }
  .topbar-nav a {
    padding: 5px 8px;
    font-size: 0.75rem;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero .subtitle {
    font-size: 0.95rem;
  }
  .hero .tagline {
    font-size: 0.88rem;
    padding: 12px 16px;
  }
  .module-title {
    font-size: 1.3rem;
  }
  .module-desc {
    font-size: 0.85rem;
  }
  .module-header {
    margin-bottom: 20px;
  }
  .module-section {
    padding: 36px 0;
  }
  .controls-panel {
    padding: 18px;
  }
  .visual-content {
    padding: 14px;
  }
  .chart-container {
    min-height: 320px;
  }
  .visual-panel {
    min-height: 340px;
  }
  .rocket-info-panel {
    position: relative;
    top: auto;
    right: auto;
    margin-top: 16px;
    min-width: auto;
    width: 100%;
  }
  .rocket-visual {
    flex-direction: column;
    height: auto;
  }
  .rocket-svg-container {
    height: 360px;
  }
  .fault-controls {
    padding: 16px;
    gap: 16px;
  }
  .fault-controls label {
    min-width: 100%;
  }
  .metric-card {
    padding: 12px 14px;
  }
  .metric-value {
    font-size: 1.1rem;
  }
  .compare-chart {
    height: 220px;
  }
  .recovery-svg {
    height: 260px;
    max-height: 260px;
  }
  .recovery-svg-wrap {
    min-height: 260px;
  }
}

/* 大屏手机 480px */
@media (max-width: 480px) {
  .container {
    padding: 0 14px;
  }
  .topbar {
    padding: 10px 0;
  }
  .topbar-menu-btn {
    display: flex;
  }
  .topbar-nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(11, 16, 32, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--rule);
    padding: 12px 16px;
    gap: 4px;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 999;
    align-items: stretch;
  }
  .topbar-nav.open {
    transform: translateY(0);
    opacity: 1;
  }
  .topbar-nav a {
    padding: 10px 14px;
    font-size: 0.88rem;
    text-align: center;
  }
  .topbar-nav a.active::after {
    display: none;
  }
  .topbar-logo span {
    font-size: 0.9rem;
  }
  .hero {
    padding: 40px 0 30px;
  }
  .hero h1 {
    font-size: 1.5rem;
  }
  .hero .subtitle {
    font-size: 0.85rem;
    margin-bottom: 14px;
  }
  .hero .tagline {
    font-size: 0.82rem;
    padding: 10px 14px;
    margin-bottom: 20px;
  }
  .hero-cta {
    padding: 10px 22px;
    font-size: 0.85rem;
  }
  .scroll-indicator {
    margin-top: 24px;
  }
  .module-section {
    padding: 28px 0;
    scroll-margin-top: calc(var(--nav-height) + 6px);
  }
  .module-num {
    font-size: 0.68rem;
    letter-spacing: 0.12em;
  }
  .module-title {
    font-size: 1.15rem;
    margin-bottom: 6px;
  }
  .module-desc {
    font-size: 0.82rem;
    line-height: 1.6;
  }
  .module-header {
    margin-bottom: 16px;
  }
  .controls-panel {
    padding: 16px;
    border-radius: 10px;
  }
  .control-group {
    margin-bottom: 16px;
  }
  .control-group-title {
    font-size: 0.72rem;
    margin-bottom: 10px;
    padding-bottom: 6px;
  }
  .slider-row {
    margin-bottom: 14px;
  }
  .slider-label {
    font-size: 0.8rem;
    margin-bottom: 6px;
  }
  /* 移动端滑块增大触控区域 */
  input[type="range"] {
    height: 6px;
  }
  input[type="range"]::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
  }
  input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
  }
  .visual-panel {
    min-height: 300px;
    border-radius: 10px;
  }
  .visual-header {
    padding: 12px 14px;
  }
  .visual-title {
    font-size: 0.82rem;
  }
  .visual-content {
    padding: 12px;
  }
  .chart-container {
    min-height: 280px;
  }
  .metrics-row {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
  }
  .metric-card {
    padding: 10px 12px;
    border-radius: 8px;
  }
  .metric-label {
    font-size: 0.7rem;
    margin-bottom: 4px;
  }
  .metric-value {
    font-size: 1rem;
  }
  .metric-value .unit {
    font-size: 0.68rem;
  }
  .rocket-svg-container {
    height: 320px;
  }
  .recovery-svg {
    height: 240px;
    max-height: 240px;
  }
  .recovery-svg-wrap {
    min-height: 240px;
  }
  .fault-controls {
    padding: 14px;
    gap: 14px;
    margin-bottom: 16px;
  }
  .fault-controls label {
    min-width: 100%;
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: 6px 10px;
    align-items: center;
  }
  .fault-controls label .name {
    grid-column: 1;
    grid-row: 1;
    min-width: auto;
  }
  .fault-controls label .val {
    grid-column: 2;
    grid-row: 1;
    min-width: auto;
    text-align: right;
  }
  .fault-controls input[type="range"] {
    grid-column: 1 / -1;
    grid-row: 2;
    min-width: 100%;
  }
  .compare-split {
    gap: 14px;
    margin-bottom: 14px;
  }
  .compare-panel-header {
    padding: 12px 14px;
    font-size: 0.8rem;
  }
  .compare-panel-body {
    padding: 12px;
  }
  .compare-chart {
    height: 200px;
  }
  .compare-result {
    padding: 6px 10px;
    font-size: 0.75rem;
    margin-top: 8px;
  }
  .redundancy-info {
    padding: 12px 16px;
    font-size: 0.78rem;
    margin-top: 12px;
  }
  .redundancy-info strong {
    font-size: 0.82rem;
  }
  footer {
    padding: 20px 0 24px;
    font-size: 0.72rem;
  }
}

/* 小屏手机 375px */
@media (max-width: 375px) {
  .hero h1 {
    font-size: 1.35rem;
  }
  .hero .subtitle {
    font-size: 0.8rem;
  }
  .module-title {
    font-size: 1.05rem;
  }
  .controls-panel {
    padding: 14px;
  }
  .metrics-row {
    gap: 8px;
  }
  .metric-card {
    padding: 8px 10px;
  }
  .metric-value {
    font-size: 0.95rem;
  }
  .rocket-svg-container {
    height: 280px;
  }
  .chart-container {
    min-height: 260px;
  }
  .recovery-svg {
    height: 220px;
    max-height: 220px;
  }
  .recovery-svg-wrap {
    min-height: 220px;
  }
  .compare-chart {
    height: 180px;
  }
}

/* ===== 动画 ===== */
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 8px var(--accent-glow); }
  50% { box-shadow: 0 0 20px var(--accent-glow); }
}

@keyframes flicker {
  0% { opacity: 0.4; }
  100% { opacity: 0.7; }
}

.fade-in {
  animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #2a3756; }

/* ===== 火箭 SVG 尾焰动画 ===== */
.flame-outer {
  transform-origin: center top;
  animation: flameFlicker 0.15s ease-in-out infinite alternate;
}
.flame-inner {
  transform-origin: center top;
  animation: flameFlicker 0.1s ease-in-out infinite alternate-reverse;
}
@keyframes flameFlicker {
  0% { transform: scaleY(0.92) scaleX(0.96); opacity: 0.8; }
  100% { transform: scaleY(1.05) scaleX(1.02); opacity: 1; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}