/**
 * 爱刷题吖 (MiniProgram Official Website)
 * 组件系统：悬浮悬空高透毛玻璃导航栏、Logo同款星空纸飞机Hero、1:1真实手机样机
 */

/* ========== 1. 悬浮悬空毛玻璃胶囊导航条 (Floating Island Glass Navbar) ========== */
/* ========== 1. 苹果级高透悬浮毛玻璃胶囊导航栏 (Liquid Frosted Glass Capsule Navbar) ========== */
/* ========== 1. 苹果级高透悬浮毛玻璃胶囊导航栏 (Liquid Frosted Glass Capsule Navbar) ========== */
.nav-capsule-wrapper {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 24px;
  display: flex;
  justify-content: center;
  pointer-events: none;
}

.nav-capsule-bar {
  pointer-events: auto;
  width: 100%;
  max-width: 1340px;
  height: 70px;
  background: rgba(255, 255, 255, 0.58);
  backdrop-filter: blur(28px) saturate(190%) brightness(102%);
  -webkit-backdrop-filter: blur(28px) saturate(190%) brightness(102%);
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(255, 255, 255, 0.88);
  box-shadow: 
    0 16px 36px -6px rgba(15, 23, 42, 0.09),
    0 4px 18px -2px rgba(37, 99, 235, 0.06),
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.95),
    inset 0 -1px 2px 0 rgba(0, 0, 0, 0.03);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px 0 22px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 无论在页面任何位置、无论是否滚动，导航栏始终保持完全一致的高透毛玻璃形态 (Liquid Frosted Glass) */
.nav-capsule-bar.scrolled {
  background: rgba(255, 255, 255, 0.58);
  backdrop-filter: blur(28px) saturate(190%) brightness(102%);
  -webkit-backdrop-filter: blur(28px) saturate(190%) brightness(102%);
  border-color: rgba(255, 255, 255, 0.88);
  box-shadow: 
    0 20px 45px -6px rgba(15, 23, 42, 0.12),
    0 6px 20px -2px rgba(37, 99, 235, 0.08),
    inset 0 1.5px 1.5px 0 rgba(255, 255, 255, 0.95);
}

/* 品牌 Logo 区域 */
.nav-brand-group {
  display: flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
}

.nav-brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.22);
  border: 1.5px solid rgba(255, 255, 255, 0.9);
  object-fit: cover;
  transition: transform 0.25s ease;
}

.nav-brand-group:hover .nav-brand-icon {
  transform: scale(1.06) rotate(3deg);
}

.nav-brand-info {
  display: flex;
  flex-direction: column;
}

.nav-brand-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand-name {
  font-family: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  font-size: 20px;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.2px;
}

.nav-brand-chip {
  font-size: 11px;
  font-weight: 700;
  padding: 2.5px 9px;
  background: rgba(37, 99, 235, 0.08);
  color: #1d4ed8;
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-pill);
  letter-spacing: 0.2px;
}

.nav-brand-sub {
  font-size: 11px;
  color: #64748b;
  font-weight: 600;
  letter-spacing: 0.3px;
  margin-top: 1px;
}

/* 导航药丸轨道 */
.nav-track-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(241, 245, 249, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 5px 6px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.85);
}

.nav-pill-item {
  font-size: 15px;
  font-weight: 700;
  color: #475569;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-block;
  letter-spacing: 0.2px;
}

.nav-pill-item:hover {
  color: #1d4ed8;
  background: rgba(255, 255, 255, 0.8);
}

.nav-pill-item.active {
  color: #1d4ed8;
  background: #ffffff;
  font-weight: 800;
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.12);
}

/* 导航右侧启动行动按钮 (流光天空蓝胶囊) */
.nav-btn-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 50%, #1d4ed8 100%);
  color: #ffffff;
  font-size: 14.5px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  white-space: nowrap;
}

.nav-btn-action:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.48);
  filter: brightness(1.05);
}

.nav-btn-action:active {
  transform: translateY(1px);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.nav-btn-icon {
  width: 16px;
  height: 16px;
}

/* 呼吸光点 */
.nav-live-dot {
  position: relative;
  width: 8px;
  height: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.dot-core {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 6px #4ade80;
}

.dot-ping {
  position: absolute;
  top: -2px;
  left: -2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid #4ade80;
  animation: pingDot 1.8s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes pingDot {
  0% { transform: scale(0.8); opacity: 0.9; }
  80%, 100% { transform: scale(2.2); opacity: 0; }
}

/* ========== 2. Hero 晴空万里与纸飞机意象 (Sky & Airplane Trail) ========== */
.hero-section {
  padding-top: 140px;
  padding-bottom: 104px;
  /* 从顶部的湛蓝天空，平滑过渡到底部晨曦微粉与云天白底 */
  background: 
    linear-gradient(180deg, #2b7af8 0%, #3b82f6 30%, #93c5fd 65%, #f0f7ff 100%);
  position: relative;
  overflow: hidden;
}

/* 毛玻璃环境透光光斑 (Ambient Frosted Glass Emitters) */
.hero-ambient-orb {
  position: absolute;
  pointer-events: none;
  z-index: 0;
  border-radius: 50%;
  filter: blur(75px);
}

.orb-top-cyan {
  top: -30px;
  left: 15%;
  width: 560px;
  height: 280px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.55) 0%, rgba(37, 99, 235, 0.2) 60%, transparent 80%);
}

.orb-top-gold {
  top: 0;
  right: 15%;
  width: 520px;
  height: 300px;
  background: radial-gradient(circle, rgba(254, 240, 138, 0.45) 0%, rgba(245, 158, 11, 0.18) 55%, transparent 75%);
}

/* Logo 灵感元素：白色纸飞机飘逸旋转航线 (SVG Trail Overlay) */
.hero-airplane-trail-svg {
  position: absolute;
  top: 60px;
  left: 20%;
  width: 500px;
  height: 350px;
  pointer-events: none;
  z-index: 1;
  opacity: 0.45;
}

/* Logo 灵感元素：闪耀的四角星芒 */
.sparkle-star {
  position: absolute;
  pointer-events: none;
  z-index: 1;
  animation: pulseTwinkle 3.5s infinite ease-in-out;
}

.sparkle-1 {
  top: 120px;
  left: 12%;
  width: 24px;
  height: 24px;
}

.sparkle-2 {
  top: 90px;
  right: 18%;
  width: 32px;
  height: 32px;
  animation-delay: 1.5s;
}

@keyframes pulseTwinkle {
  0%, 100% { opacity: 0.3; transform: scale(0.8) rotate(0deg); }
  50% { opacity: 1; transform: scale(1.15) rotate(15deg); filter: drop-shadow(0 0 10px #ffffff); }
}

/* Logo 晨曦朝霞粉云斑 */
.cloud-glow-pink {
  position: absolute;
  bottom: -60px;
  left: 5%;
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, rgba(251, 207, 232, 0.7) 0%, rgba(244, 114, 182, 0.4) 45%, rgba(244, 114, 182, 0) 75%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.cloud-glow-gold {
  position: absolute;
  top: 80px;
  right: 8%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(254, 240, 138, 0.6) 0%, rgba(253, 224, 71, 0.3) 45%, rgba(253, 224, 71, 0) 75%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.24fr 0.76fr;
  align-items: center;
  gap: 68px;
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 760px;
}

/* 极品微光胶囊微标 */
.hero-eyebrow-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px rgba(30, 64, 175, 0.12);
  margin-bottom: 24px;
}

.eyebrow-sparkle {
  font-size: 13px;
  line-height: 1;
}

.eyebrow-text {
  font-size: 13.5px;
  font-weight: 800;
  color: #1e40af;
  letter-spacing: 0.4px;
}

/* 震撼艺术大标题 (Typography Masterpiece) */
.hero-title {
  margin-bottom: 24px;
}

.hero-title-lead {
  display: block;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3.5px;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 12px;
  text-shadow: 0 2px 10px rgba(15, 23, 42, 0.2);
}

.hero-title-main {
  display: block;
  font-size: 58px;
  font-weight: 900;
  line-height: 1.18;
  color: #ffffff;
  letter-spacing: -0.8px;
  text-shadow: 0 4px 24px rgba(26, 86, 219, 0.45);
}

/* 更有价值 词条金光渐变 + 优美微笑弧线 SVG */
.hero-highlight-phrase {
  display: inline-block;
  position: relative;
  background: linear-gradient(135deg, #ffffff 0%, #fef08a 45%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 12px rgba(245, 158, 11, 0.35));
}

.gold-brush-arc {
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 16px;
  pointer-events: none;
  filter: drop-shadow(0 2px 6px rgba(245, 158, 11, 0.5));
}

/* 副文案 */
.hero-subtitle {
  font-size: 17.5px;
  color: #f0f9ff;
  line-height: 1.9;
  margin-bottom: 28px;
  font-weight: 500;
  max-width: 700px;
  text-shadow: 0 1px 6px rgba(15, 23, 42, 0.18);
}

.hero-subtitle strong {
  color: #ffffff;
  font-weight: 800;
  background: rgba(255, 255, 255, 0.16);
  padding: 1px 6px;
  border-radius: 5px;
}

/* 4 大核心特性微型磨砂芯片 */
.hero-chips-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 38px;
}

.hero-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 16px;
  background: rgba(255, 255, 255, 0.48);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 700;
  color: #0f172a;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
}

.chip-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}
.dot-blue { background: #2563eb; box-shadow: 0 0 6px #38bdf8; }
.dot-purple { background: #8b5cf6; box-shadow: 0 0 6px #c084fc; }
.dot-emerald { background: #10b981; box-shadow: 0 0 6px #34d399; }
.dot-amber { background: #f59e0b; box-shadow: 0 0 6px #fbbf24; }

/* 按钮区 */
.hero-buttons {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 36px;
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 50%, #1d4ed8 100%);
  color: #ffffff;
  font-size: 16px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.38), 0 2px 4px rgba(0, 0, 0, 0.08);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.48);
  filter: brightness(1.05);
}

.btn-hero-primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-hero-glass {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 32px;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: #ffffff;
  font-size: 16px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  text-shadow: 0 1px 3px rgba(15, 23, 42, 0.25);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.btn-hero-glass:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.9);
  color: #1d4ed8;
  text-shadow: none;
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.18);
}

.btn-hero-glass:active {
  transform: translateY(1px);
}

/* 核心数据亮点：3 张通透水光水晶卡片 (Crystal Frosted Glass Widgets) */
.hero-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.metric-card-glass {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-radius: 20px;
  padding: 18px 20px;
  border: 1.5px solid rgba(255, 255, 255, 0.88);
  box-shadow: 
    0 12px 28px -4px rgba(15, 23, 42, 0.07),
    inset 0 1px 1.5px 0 #ffffff;
  display: flex;
  flex-direction: column;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.metric-card-glass:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 
    0 16px 36px -4px rgba(37, 99, 235, 0.15),
    inset 0 1px 2px #ffffff;
}

.metric-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.metric-num {
  font-family: 'Outfit', sans-serif;
  font-size: 32px;
  font-weight: 900;
  color: #1e40af;
  line-height: 1;
  letter-spacing: -0.5px;
}

.metric-unit {
  font-size: 16px;
  font-weight: 800;
  margin-left: 2px;
  color: #2563eb;
}

.metric-icon-badge {
  font-size: 18px;
  line-height: 1;
  padding: 6px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.7);
}

.metric-label {
  font-size: 13.5px;
  font-weight: 700;
  color: #475569;
  margin-top: 8px;
  letter-spacing: 0.2px;
}

/* ========== 3. 1:1 像素级精准真实手机模拟器 ========== */
.hero-mockup-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.phone-mockup-card {
  width: 326px;
  height: 660px;
  background: #020617;
  border-radius: 48px;
  padding: 10px;
  box-shadow: 
    0 32px 84px -12px rgba(30, 58, 138, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.4),
    0 0 60px rgba(255, 255, 255, 0.5);
  border: 4px solid #1e293b;
  position: relative;
  user-select: none;
}

.phone-mockup-card::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 115px;
  width: 3px;
  height: 50px;
  background: #334155;
  border-radius: 3px 0 0 3px;
}

.phone-mockup-card::after {
  content: '';
  position: absolute;
  right: -7px;
  top: 145px;
  width: 3px;
  height: 65px;
  background: #334155;
  border-radius: 0 3px 3px 0;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: #f0f6ff;
  border-radius: 38px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

.phone-island {
  position: absolute;
  top: 9px;
  left: 50%;
  transform: translateX(-50%);
  width: 86px;
  height: 22px;
  background: #000000;
  border-radius: 20px;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 9px;
}

.island-camera {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #0f172a;
  border: 1px solid #1e293b;
}

.island-indicator {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #10b981;
}

.real-wx-nav {
  height: 84px;
  background: #2563eb;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: 8px;
  color: #ffffff;
  position: relative;
  flex-shrink: 0;
}

.wx-status-line {
  position: absolute;
  top: 12px;
  left: 20px;
  right: 20px;
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 600;
  color: #ffffff;
}

.wx-title-line {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  position: relative;
  padding: 0 16px;
}

.wx-capsule {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 68px;
  height: 26px;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 4px;
}

.capsule-dots {
  display: flex;
  gap: 2.5px;
}

.capsule-dot {
  width: 3px;
  height: 3px;
  background: #ffffff;
  border-radius: 50%;
}

.capsule-divider {
  width: 1px;
  height: 14px;
  background: rgba(255, 255, 255, 0.25);
}

.capsule-circle-icon {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1.5px solid #ffffff;
}

.phone-screen-body {
  flex: 1;
  overflow-y: auto;
  position: relative;
  background: #f0f6ff;
  padding: 12px;
}

.screen-view {
  display: none;
}

.screen-view.active {
  display: block;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 1:1 还原小程序真实首页 */
.real-brand-hero {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  border-radius: 20px;
  padding: 14px;
  color: #ffffff;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.2);
  margin-bottom: 12px;
}

.real-hero-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.real-hero-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.real-hero-title {
  font-size: 15px;
  font-weight: 800;
  line-height: 1.2;
}

.real-hero-slogan {
  font-size: 9.5px;
  color: #bfdbfe;
  margin-top: 2px;
}

.real-visit-stats {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.real-visit-pill {
  flex: 1;
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(4px);
  padding: 5px 8px;
  border-radius: 10px;
  font-size: 9.5px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 4px;
}

.real-subject-card {
  background: #ffffff;
  border-radius: 14px;
  padding: 9px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.06);
}

.real-subject-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.real-subject-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: #eff6ff;
  color: #2563eb;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.real-subject-hint {
  font-size: 8.5px;
  color: #64748b;
}

.real-subject-name {
  font-size: 11px;
  font-weight: 800;
  color: #0f172a;
}

.real-subject-badge {
  background: #eff6ff;
  color: #2563eb;
  font-size: 9.5px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 6px;
}

.real-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 10px 0 8px;
}

.real-section-title {
  font-size: 12px;
  font-weight: 800;
  color: #0f172a;
}

.real-section-sub {
  font-size: 8.5px;
  color: #64748b;
  margin-left: 4px;
}

.real-type-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.real-type-card {
  background: #ffffff;
  border-radius: 14px;
  padding: 10px;
  border: 1.5px solid #e2e8f0;
  box-shadow: 0 3px 0 #e2e8f0;
}

.real-type-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.real-type-icon {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
}

.real-type-pill {
  font-size: 8px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 5px;
  background: #f1f5f9;
  color: #64748b;
}

.real-type-title {
  font-size: 11.5px;
  font-weight: 800;
  color: #0f172a;
}

.real-type-desc {
  font-size: 8px;
  color: #64748b;
  margin-top: 2px;
}

.real-banner-card {
  background: #ffffff;
  border-radius: 14px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1.5px solid #e2e8f0;
  box-shadow: 0 3px 0 #e2e8f0;
  margin-bottom: 8px;
}

.real-banner-title {
  font-size: 11.5px;
  font-weight: 800;
  color: #0f172a;
}

.real-banner-sub {
  font-size: 8px;
  color: #64748b;
  margin-top: 2px;
}

.real-banner-btn {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: #ffffff;
  font-size: 9.5px;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  white-space: nowrap;
}

.real-banner-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.4);
}

.real-banner-btn:active {
  transform: translateY(1px);
}

/* 1:1 还原做题页真机截图 (计算机真题展示) */
.real-quiz-screen {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.real-q-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.real-q-tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  padding: 3px 8px;
  border-radius: 8px;
  font-size: 9px;
  font-weight: 700;
  box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}

.real-q-num-tag {
  background: #2563eb;
  color: #ffffff;
  padding: 1px 5px;
  border-radius: 4px;
}

.real-q-type-tag {
  background: #f59e0b;
  color: #ffffff;
  padding: 1px 5px;
  border-radius: 4px;
}

.real-card-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #ffffff;
  padding: 3px 8px;
  border-radius: 8px;
  font-size: 9px;
  font-weight: 700;
  color: #2563eb;
  border: 1px solid #dbeafe;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.real-card-btn:hover {
  background: #eff6ff;
  border-color: #bfdbfe;
}

.real-question-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.05);
  border: 1px solid #e2e8f0;
}

.real-question-title {
  font-size: 13px;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.45;
  margin-bottom: 12px;
}

.real-input-box {
  width: 100%;
  height: 60px;
  background: #f8fafc;
  border: 1.5px solid #e2e8f0;
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 11px;
  color: #0f172a;
  margin-bottom: 10px;
}

.real-q-fav-line {
  display: flex;
  justify-content: flex-end;
}

.real-fav-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 9.5px;
  color: #d97706;
  font-weight: 700;
  background: #fffbeb;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid #fde68a;
}

.real-feedback-card {
  background: #ffffff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.05);
  border: 1px solid #e2e8f0;
}

.real-feedback-head-wrong {
  background: #fef2f2;
  color: #dc2626;
  padding: 8px 12px;
  font-size: 11.5px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-bottom: 1px solid #fee2e2;
}

.head-wrong-icon {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #ef4444;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
}

.real-feedback-body {
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.real-correct-box {
  background: #ecfdf5 !important;
  border-left: 4px solid #10b981 !important;
  border-radius: 10px;
  padding: 8px 10px;
}

.real-correct-title {
  font-size: 10px;
  font-weight: 800;
  color: #065f46 !important;
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
}

.real-correct-text {
  font-size: 9.5px;
  color: #064e3b !important;
  line-height: 1.45;
  font-weight: 600;
}

.real-exp-box {
  background: #fffbeb !important;
  border-left: 4px solid #f59e0b !important;
  border-radius: 10px;
  padding: 8px 10px;
}

.real-exp-title {
  font-size: 10px;
  font-weight: 800;
  color: #92400e !important;
  margin-bottom: 4px;
}

.real-exp-text {
  font-size: 9px;
  color: #78350f !important;
  line-height: 1.45;
  font-weight: 500;
}

.real-bottom-nav {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.real-nav-pill-prev {
  flex: 1;
  background: #ffffff;
  color: #475569;
  border-radius: 16px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10.5px;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  border: 1px solid #e2e8f0;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.real-nav-pill-prev:hover {
  background: #f8fafc;
  color: #1e293b;
  border-color: #cbd5e1;
}

.real-nav-pill-next {
  flex: 1;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: #ffffff;
  border-radius: 16px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10.5px;
  font-weight: 700;
  box-shadow: 0 3px 8px rgba(37, 99, 235, 0.3);
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.real-nav-pill-next:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.real-exam-timer {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 24px;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 1px;
  font-family: 'Outfit', 'Plus Jakarta Sans', monospace, sans-serif;
  margin-bottom: 6px;
}

.real-phone-tabbar {
  height: 48px;
  background: #ffffff;
  border-top: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding-bottom: 4px;
  flex-shrink: 0;
}

.tabbar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: #94a3b8;
  font-size: 8.5px;
  font-weight: 600;
  position: relative;
}

.tabbar-item.active {
  color: #2563eb;
}

.tabbar-svg {
  width: 17px;
  height: 17px;
}

.tabbar-badge {
  position: absolute;
  top: -2px;
  right: -6px;
  width: 12px;
  height: 12px;
  background: #ef4444;
  color: #ffffff;
  border-radius: 50%;
  font-size: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-tabs-bar {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 26px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(20px);
  padding: 6px;
  border-radius: var(--radius-pill);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.14);
  border: 1.5px solid #ffffff;
}

.mockup-tab-btn {
  padding: 9px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  color: #64748b;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.mockup-tab-btn:hover {
  color: #1d4ed8;
  background: rgba(37, 99, 235, 0.08);
}

.mockup-tab-btn.active {
  background: linear-gradient(135deg, #2b7af8 0%, #1d4ed8 100%);
  color: #ffffff;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

/* ========== 4. 核心功能六维矩阵 ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card-cloud {
  background: #ffffff;
  border-radius: var(--radius-xl);
  padding: 38px 32px;
  border: 1.5px solid rgba(226, 232, 240, 0.9);
  border-top: 3.5px solid #2563eb;
  box-shadow: 0 10px 30px -4px rgba(37, 99, 235, 0.08), 0 4px 12px rgba(15, 23, 42, 0.03);
  position: relative;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.feature-card-cloud:hover {
  transform: translateY(-8px);
  border-color: #93c5fd;
  border-top-color: #1d4ed8;
  box-shadow: 0 20px 40px -8px rgba(37, 99, 235, 0.16), 0 8px 16px rgba(15, 23, 42, 0.05);
}

.feature-icon-box-sky {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1.5px solid #bfdbfe;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #2563eb;
  margin-bottom: 24px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.12);
}

.feature-title {
  font-family: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  font-size: 20px;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 12px;
  letter-spacing: -0.2px;
}

.feature-desc {
  font-size: 14.5px;
  color: #475569;
  line-height: 1.7;
  flex: 1;
}

.feature-tag-sky {
  display: inline-flex;
  align-self: flex-start;
  margin-top: 22px;
  padding: 4px 12px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 800;
  color: #1d4ed8;
}

/* ========== 5. 题库共建与致用户的一封信 ========== */
.community-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.letter-card-book {
  background: #ffffff;
  border-radius: var(--radius-xl);
  padding: 42px;
  border: 1.5px solid #dbeafe;
  box-shadow: 0 16px 36px -6px rgba(37, 99, 235, 0.1);
  position: relative;
}

.letter-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.letter-avatar {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  border: 2px solid #bfdbfe;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.18);
}

.letter-author {
  font-size: 19px;
  font-weight: 900;
  color: #0f172a;
}

.letter-role {
  font-size: 13px;
  color: #2563eb;
  font-weight: 700;
}

.letter-content {
  font-size: 15px;
  color: #334155;
  line-height: 1.85;
}

.letter-content p {
  margin-bottom: 16px;
}

.letter-signature {
  margin-top: 24px;
  text-align: right;
  font-weight: 800;
  color: #1e40af;
  font-size: 14.5px;
}

.contribute-card-cover {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 50%, #172554 100%);
  border-radius: var(--radius-xl);
  padding: 42px;
  color: #ffffff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 2px solid #3b82f6;
  box-shadow: 0 20px 48px -8px rgba(30, 58, 138, 0.4);
}

.contribute-title {
  font-family: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  font-size: 26px;
  font-weight: 900;
  margin-bottom: 14px;
  color: #ffffff;
}

.contribute-desc {
  font-size: 15px;
  line-height: 1.75;
  color: #dbeafe;
  margin-bottom: 28px;
}

.contribute-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14px;
  font-weight: 700;
  color: #eff6ff;
}

.step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: 1.5px solid #ffffff;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 900;
  flex-shrink: 0;
}

/* 题库共建计划行动按钮 (纯白悬浮药丸) */
.btn-community-contribute {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  background: #ffffff;
  color: #1e40af;
  font-size: 15px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.22), 0 2px 6px rgba(0, 0, 0, 0.08);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn-community-contribute:hover {
  transform: translateY(-2px);
  background: #f8fafc;
  color: #1d4ed8;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.3), 0 4px 10px rgba(0, 0, 0, 0.1);
}

.btn-community-contribute:active {
  transform: translateY(1px);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.18);
}

/* ========== 6. 扫码与作者联络 ========== */
.qr-cta-section {
  background: #f0f7ff;
  padding-bottom: 100px;
}

/* 微信扫一扫体验主行动按钮 (流光天空蓝胶囊大按钮) */
.btn-scan-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 50%, #1d4ed8 100%);
  color: #ffffff;
  font-size: 16px;
  font-weight: 800;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.38), 0 2px 6px rgba(0, 0, 0, 0.08);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
}

.btn-scan-main:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(37, 99, 235, 0.48);
  filter: brightness(1.05);
}

.btn-scan-main:active {
  transform: translateY(1px);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.author-contact-head-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 800;
  color: #1e293b;
  margin-bottom: 14px;
}

.qr-cta-card-white {
  background: linear-gradient(135deg, #ffffff 0%, #eff6ff 100%);
  border-radius: var(--radius-xl);
  border: 2px solid #bfdbfe;
  padding: 60px 48px;
  box-shadow: 0 24px 60px -10px rgba(37, 99, 235, 0.16);
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  gap: 52px;
}

.qr-cta-title {
  font-family: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  font-size: 38px;
  font-weight: 900;
  color: #0f172a;
  line-height: 1.25;
  margin-bottom: 18px;
}

.qr-cta-desc {
  font-size: 16px;
  color: #475569;
  line-height: 1.75;
  margin-bottom: 34px;
}

.qr-code-box-white {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #ffffff;
  padding: 26px;
  border-radius: 30px;
  border: 2px solid #dbeafe;
  box-shadow: 0 20px 45px rgba(37, 99, 235, 0.15);
  text-align: center;
}

.real-qr-image {
  width: 210px;
  height: 210px;
  object-fit: contain;
  margin-bottom: 12px;
}

.qr-hint-text {
  font-size: 15px;
  font-weight: 900;
  color: #1e40af;
}

.qr-sub-text {
  font-size: 11px;
  color: #64748b;
  margin-top: 4px;
}

.author-contacts-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 20px;
}

.contact-pill-white {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: #ffffff;
  border: 1.5px solid #dbeafe;
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 700;
  color: #1e293b;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.06);
  cursor: pointer;
  transition: all 0.2s ease;
}

.contact-pill-white:hover {
  border-color: #2563eb;
  color: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.15);
}

.copy-badge-blue {
  font-size: 11px;
  padding: 2px 7px;
  background: #eff6ff;
  border-radius: 6px;
  color: #2563eb;
  font-weight: 800;
}

/* Modal 与页脚 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(16px);
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-card-white {
  width: 90%;
  max-width: 400px;
  background: #ffffff;
  border: 2px solid #bfdbfe;
  border-radius: var(--radius-xl);
  padding: 36px 30px;
  text-align: center;
  box-shadow: 0 25px 70px rgba(15, 23, 42, 0.25);
  position: relative;
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.modal-overlay.active .modal-card-white {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #64748b;
  cursor: pointer;
  transition: all 0.2s ease;
  line-height: 1;
}

.modal-close-btn:hover {
  background: #fee2e2;
  color: #ef4444;
  transform: scale(1.08);
}

.site-footer {
  background: #ffffff;
  border-top: 1.5px solid #e2e8f0;
  padding: 50px 0 36px;
  text-align: center;
}

.footer-copy {
  font-size: 13px;
  color: #64748b;
  margin-top: 12px;
}

/* ==========================================================================
   全设备多端响应式适配规范 (电脑端、平板端、手机端全面无缝自适应)
   ========================================================================== */

/* 1. 笔记本与中大平板横屏 (1025px - 1200px) */
@media (max-width: 1200px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 36px;
  }
  .hero-title-main {
    font-size: 50px;
  }
  .features-grid {
    gap: 20px;
  }
  .community-grid {
    gap: 24px;
  }
  .letter-card-book,
  .contribute-card-cover {
    padding: 34px 28px;
  }
  .qr-cta-card-white {
    padding: 48px 36px;
    gap: 36px;
  }
}

/* 2. 平板端 (769px - 1024px，如 iPad 10.2" / iPad Air / iPad Pro 竖屏与横屏) */
@media (max-width: 1024px) {
  .nav-capsule-bar {
    height: 64px;
    padding: 0 14px 0 18px;
    background: rgba(255, 255, 255, 0.58);
    backdrop-filter: blur(28px) saturate(190%) brightness(102%);
    -webkit-backdrop-filter: blur(28px) saturate(190%) brightness(102%);
  }
  .nav-capsule-bar.scrolled {
    height: 64px;
    background: rgba(255, 255, 255, 0.58);
    backdrop-filter: blur(28px) saturate(190%) brightness(102%);
    -webkit-backdrop-filter: blur(28px) saturate(190%) brightness(102%);
  }
  .nav-brand-icon {
    width: 38px;
    height: 38px;
  }
  .nav-brand-name {
    font-size: 17px;
  }
  .nav-brand-sub {
    font-size: 10px;
  }
  .nav-pill-item {
    font-size: 13.5px;
    padding: 6px 14px;
  }
  .nav-btn-action {
    padding: 9px 18px;
    font-size: 13.5px;
  }

  .hero-section {
    padding-top: 120px;
    padding-bottom: 72px;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 52px;
  }
  .hero-content {
    max-width: 720px;
    margin: 0 auto;
  }
  .hero-title-main {
    font-size: 46px;
  }
  .hero-subtitle {
    max-width: 600px;
    margin: 0 auto 28px;
  }
  .hero-chips-bar {
    justify-content: center;
  }
  .hero-buttons {
    justify-content: center;
  }
  .hero-metrics-grid {
    max-width: 540px;
    margin: 0 auto;
    gap: 14px;
  }
  .hero-mockup-wrapper {
    margin: 0 auto;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .community-grid {
    grid-template-columns: 1fr;
    max-width: 700px;
    margin: 0 auto;
  }
  .qr-cta-card-white {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 44px 32px;
    gap: 36px;
  }
  .author-contacts-bar {
    justify-content: center;
  }
  .qr-code-box-white {
    margin: 0 auto;
    width: fit-content;
  }
}

/* 3. 手机端与小屏平板竖屏 (<= 768px，如各类主流智能手机与小型平板) */
@media (max-width: 768px) {
  .section {
    padding: 68px 0;
  }
  .section-header {
    margin-bottom: 40px;
  }
  .section-title-logo {
    font-size: 26px;
  }
  .section-desc-logo {
    font-size: 14px;
  }

  /* 导航栏手机端：高度恒定、居中悬浮、高透毛玻璃效果与电脑端 100% 一致 */
  .nav-capsule-wrapper {
    top: 12px;
    padding: 0 12px;
  }
  .nav-capsule-bar {
    height: 56px;
    padding: 0 12px 0 14px;
    background: rgba(255, 255, 255, 0.62);
    backdrop-filter: blur(25px) saturate(190%) brightness(102%);
    -webkit-backdrop-filter: blur(25px) saturate(190%) brightness(102%);
    border: 1.5px solid rgba(255, 255, 255, 0.88);
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
  }
  .nav-capsule-bar.scrolled {
    height: 56px;
    background: rgba(255, 255, 255, 0.62);
    backdrop-filter: blur(25px) saturate(190%) brightness(102%);
    -webkit-backdrop-filter: blur(25px) saturate(190%) brightness(102%);
    border-color: rgba(255, 255, 255, 0.88);
  }
  .nav-track-pills {
    display: none;
  }
  .nav-brand-group {
    gap: 9px;
  }
  .nav-brand-icon {
    width: 34px;
    height: 34px;
    border-radius: 9px;
  }
  .nav-brand-name {
    font-size: 16px;
  }
  .nav-brand-chip {
    display: none;
  }
  .nav-brand-sub {
    display: none;
  }
  .nav-btn-action {
    padding: 8px 14px;
    font-size: 13px;
    gap: 6px;
  }

  /* 首屏 Hero 手机端自适应 */
  .hero-section {
    padding-top: 88px;
    padding-bottom: 48px;
  }
  .hero-airplane-trail-svg {
    opacity: 0.2;
  }
  .hero-title-lead {
    font-size: 15px;
    letter-spacing: 2px;
  }
  .hero-title-main {
    font-size: 34px;
    line-height: 1.3;
  }
  .hero-subtitle {
    font-size: 14.5px;
    line-height: 1.65;
  }
  .hero-chips-bar {
    gap: 8px;
    margin-bottom: 24px;
  }
  .hero-chip {
    padding: 5px 12px;
    font-size: 12px;
  }
  .hero-buttons {
    flex-direction: column;
    width: 100%;
    max-width: 360px;
    margin: 0 auto 34px;
    gap: 12px;
  }
  .btn-hero-primary,
  .btn-hero-glass {
    width: 100%;
    padding: 14px 20px;
    font-size: 15px;
  }
  .hero-metrics-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    gap: 12px;
  }

  /* 手机模拟器样机在移动端的自适应缩放 */
  .phone-mockup-card {
    width: min(315px, 92vw);
    height: 610px;
    margin: 0 auto;
    border-radius: 40px;
    padding: 8px;
  }
  .phone-screen {
    border-radius: 32px;
  }
  .mockup-tabs-bar {
    width: min(315px, 92vw);
    margin: 20px auto 0;
    padding: 5px;
  }
  .mockup-tab-btn {
    padding: 8px 10px;
    font-size: 12px;
    flex: 1;
    text-align: center;
  }

  /* 核心特性卡片网格单列 */
  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .feature-card-cloud {
    padding: 28px 22px;
  }
  .feature-icon-box-sky {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    margin-bottom: 18px;
  }

  /* 题库共建与信笺卡片 */
  .community-grid {
    gap: 20px;
  }
  .letter-card-book,
  .contribute-card-cover {
    padding: 30px 20px;
    border-radius: var(--radius-lg);
  }
  .btn-community-contribute {
    width: 100%;
    padding: 13px 20px;
  }

  /* 扫码体验大卡片 */
  .qr-cta-card-white {
    padding: 34px 20px;
    border-radius: var(--radius-lg);
    gap: 28px;
  }
  .qr-cta-title {
    font-size: 26px;
  }
  .qr-cta-desc {
    font-size: 14px;
    margin-bottom: 22px;
  }
  .btn-scan-main {
    width: 100%;
    padding: 14px 20px;
    font-size: 15px;
  }
  .author-contacts-bar {
    flex-direction: column;
    gap: 10px;
    width: 100%;
  }
  .contact-pill-white {
    width: 100%;
    justify-content: space-between;
    padding: 11px 16px;
  }
  .qr-code-box-white {
    width: 100%;
    max-width: 250px;
    padding: 20px;
  }
  .real-qr-image {
    width: 180px;
    height: 180px;
  }

  /* 弹窗适配 */
  .modal-card-white {
    width: 92%;
    max-width: 340px;
    padding: 28px 18px;
  }
  .modal-card-white img {
    width: 190px !important;
    height: 190px !important;
  }
}

/* 4. 紧凑型小屏手机 (<= 480px，如 iPhone SE, iPhone 12/13 mini 及小屏 Android) */
@media (max-width: 480px) {
  .nav-capsule-wrapper {
    top: 8px;
    padding: 0 8px;
  }
  .nav-capsule-bar {
    height: 52px;
    padding: 0 10px 0 12px;
  }
  .nav-brand-icon {
    width: 30px;
    height: 30px;
  }
  .nav-brand-name {
    font-size: 15px;
  }
  .nav-btn-action {
    padding: 7px 12px;
    font-size: 12px;
  }

  .hero-section {
    padding-top: 78px;
    padding-bottom: 40px;
  }
  .hero-title-main {
    font-size: 29px;
  }
  .hero-subtitle {
    font-size: 13.5px;
  }
  .phone-mockup-card {
    width: min(295px, 94vw);
    height: 580px;
  }
  .real-type-grid {
    gap: 6px;
  }
  .real-type-card {
    padding: 8px 6px;
  }
  .contribute-title {
    font-size: 22px;
  }
  .qr-cta-title {
    font-size: 23px;
  }
}