/* ============================================================
 * AIPro 新手训练营宣传页 · 各模块样式（S0–S8 + 吸底栏）
 * 依赖：base.css 的 tokens 与通用组件
 * ============================================================ */

/* ==================== S0 首屏 Hero ==================== */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #081836 0%, var(--c-primary) 48%, var(--c-primary-2) 100%);
  color: #fff;
  padding: calc(var(--topbar-h) + 48px) 0 110px;
}
/* 科技感网格底纹（中心偏右，避开左侧文字区） */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(120, 170, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 170, 255, .07) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(80% 70% at 68% 40%, #000 20%, transparent 78%);
  mask-image: radial-gradient(80% 70% at 68% 40%, #000 20%, transparent 78%);
  pointer-events: none;
}
/* 底部渐隐，衔接下一模块浅色区 */
.hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 140px;
  background: linear-gradient(180deg, transparent, var(--bg-page));
  pointer-events: none;
}
/* 主 KV PNG 到位后：删除 ::before/::after 与 hero-visual 内 mock，改用背景图或 <picture> */

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 48px;
  align-items: center;
}

/* --- 左侧文案区 --- */
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .22);
  font-size: 14px;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, .92);
}
.hero-eyebrow::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 10px var(--c-cyan);
}
.hero-title {
  margin-top: 24px;
  font-size: clamp(34px, 4.2vw, 54px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(100deg, #FFB38A, var(--c-accent-2) 55%, var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub { margin-top: 18px; font-size: 17px; letter-spacing: 2px; color: rgba(255, 255, 255, .72); }

.hero-info { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px 12px; }
.hero-info li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .16);
  font-size: 14px;
  color: rgba(255, 255, 255, .9);
}
.hero-info .icon { width: 15px; height: 15px; color: var(--c-cyan-2); }
.hero-info--hot { border-color: rgba(255, 143, 61, .5); background: rgba(255, 106, 0, .14); }
.hero-info--hot .icon { color: var(--c-accent-2); }

.hero-cta { margin-top: 36px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }

/* --- 右侧主视觉（CSS 占位 KV） --- */
.hero-visual { position: relative; min-height: 440px; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; pointer-events: none; }
.hero-glow--cyan { width: 420px; height: 420px; right: -60px; top: -80px; background: rgba(0, 200, 212, .4); }
.hero-glow--orange { width: 320px; height: 320px; left: -80px; bottom: -60px; background: rgba(255, 106, 0, .28); }

.mock {
  position: absolute;
  border-radius: var(--radius-l);
  background: rgba(13, 30, 62, .6);
  border: 1px solid rgba(120, 180, 255, .28);
  backdrop-filter: blur(10px);
  box-shadow: 0 24px 60px rgba(2, 10, 30, .5);
}

/* 悬浮仪表板主卡 */
.mock-board {
  left: 8%; right: 0; top: 34px; bottom: 0;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: float 7s ease-in-out infinite alternate;
}
.mock-board-head { display: flex; align-items: center; gap: 6px; }
.mock-board-head .dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(120, 180, 255, .35); }
.mock-board-head .dot:first-child { background: rgba(255, 106, 0, .7); }
.mock-board-title { margin-left: auto; font-size: 12px; letter-spacing: 1px; color: rgba(255, 255, 255, .55); }

.mock-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.kpi { padding: 10px 12px; border-radius: 10px; background: rgba(255, 255, 255, .05); border: 1px solid rgba(120, 180, 255, .14); }
.kpi-label { font-size: 10px; letter-spacing: 1px; color: rgba(255, 255, 255, .5); }
.kpi-val { display: block; margin-top: 3px; font-family: var(--font-num); font-size: 17px; font-weight: 700; color: #fff; }
.kpi-delta { display: inline-block; margin-top: 4px; padding: 1px 6px; border-radius: 999px; font-size: 10px; }
.kpi-delta.up { color: #34D399; background: rgba(52, 211, 153, .14); }
.kpi-delta.down { color: #F87171; background: rgba(248, 113, 113, .14); }

.mock-linechart {
  flex: 1;
  min-height: 90px;
  padding: 8px;
  border-radius: 10px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(120, 180, 255, .12);
}
.mock-linechart svg { width: 100%; height: 100%; }
.ml-line { fill: none; stroke: var(--c-cyan); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 0 6px rgba(0, 200, 212, .7)); }
.ml-area { fill: url(#heroLineGrad); opacity: .55; }
.ml-dot { fill: var(--c-accent); }
.ml-ring { fill: none; stroke: var(--c-accent); stroke-width: 2; transform-box: fill-box; transform-origin: center; animation: ringPulse 2.2s ease-out infinite; }
@keyframes ringPulse {
  0% { transform: scale(1); opacity: .9; }
  70%, 100% { transform: scale(2.6); opacity: 0; }
}

.mock-barchart { display: flex; align-items: flex-end; gap: 6px; height: 48px; }
.mock-barchart b { flex: 1; border-radius: 4px 4px 0 0; height: var(--h); background: linear-gradient(180deg, var(--c-cyan-2), rgba(51, 187, 255, .08)); }
.mock-barchart b:nth-child(3n) { background: linear-gradient(180deg, var(--c-accent-2), rgba(255, 143, 61, .08)); }

/* 自然语言问数气泡 */
.mock-chat {
  left: -4%; bottom: 30px;
  width: 52%;
  padding: 12px 14px;
  background: rgba(255, 255, 255, .94);
  border: 0;
  animation: float 6s ease-in-out infinite alternate-reverse;
}
.mock-chat-head { display: flex; align-items: center; gap: 8px; }
.mock-avatar {
  width: 26px; height: 26px;
  border-radius: 50%;
  flex: none;
  display: grid; place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--c-accent-2), var(--c-accent));
}
.mock-avatar .icon { width: 14px; height: 14px; }
.mock-q { font-size: 13px; font-weight: 500; color: var(--ink-1); }
.mock-bars { margin-top: 10px; display: flex; align-items: flex-end; gap: 5px; height: 44px; }
.mock-bars b { flex: 1; border-radius: 3px 3px 0 0; height: var(--h); background: linear-gradient(180deg, var(--c-primary-3), var(--c-primary)); }
.mock-ans { margin-top: 8px; display: flex; align-items: center; gap: 5px; font-size: 11px; font-weight: 600; color: var(--c-primary-3); }
.mock-ans .icon { width: 12px; height: 12px; }

/* 环形图悬浮卡 */
.mock-donut {
  right: -2%; top: -6px;
  width: 46%;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  animation: float 8s ease-in-out .6s infinite alternate;
}
.donut-wrap { position: relative; width: 96px; height: 96px; flex: none; }
.donut {
  width: 100%; height: 100%;
  border-radius: 50%;
  background: conic-gradient(var(--c-accent) 0 46%, var(--c-cyan-2) 46% 76%, var(--c-cyan) 76% 100%);
  -webkit-mask: radial-gradient(circle, transparent 58%, #000 59%);
  mask: radial-gradient(circle, transparent 58%, #000 59%);
}
.donut-val {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-num);
  font-size: 18px; font-weight: 700;
  color: #fff;
}
.donut-legend { display: grid; gap: 7px; font-family: var(--font-num); font-size: 12px; color: rgba(255, 255, 255, .78); }
.donut-legend li { display: flex; align-items: center; gap: 7px; }
.donut-legend i { width: 8px; height: 8px; border-radius: 2px; }

@keyframes float { from { transform: translateY(-8px); } to { transform: translateY(10px); } }

/* ==================== S1 产品速览 ==================== */
.s1-tagline {
  max-width: 860px;
  margin: -28px auto 0; /* 收拢 section-head 底距 */
  text-align: center;
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink-1);
}
.s1-tagline em { font-style: normal; color: var(--c-primary-3); }
.s1-sub { margin-top: 12px; text-align: center; font-size: 15px; color: var(--ink-3); }

/* 五维能力轮播：左侧大图舞台（约 700px 宽，约为旧卡片版 3.5 倍）+ 右侧选项卡 */
.showcase { margin-top: 48px; display: grid; grid-template-columns: 1.5fr 1fr; gap: 28px; align-items: start; }

/* 舞台：5 张图叠放同一网格单元，淡入切换（微缩放） */
.sc-stage {
  display: grid;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: #fff;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.sc-slide { grid-area: 1 / 1; opacity: 0; transition: opacity .5s ease; }
.sc-slide.is-active { opacity: 1; z-index: 1; }
.sc-slide img { width: 100%; height: auto; transform: scale(1.03); transition: transform .55s ease; }
.sc-slide.is-active img { transform: none; }

/* 选项卡：编号 + 标题 + 说明，激活项底部为自动轮播进度条（main.js 驱动宽度） */
.sc-tabs { display: flex; flex-direction: column; gap: 12px; }
.sc-tab {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 10px;
  align-items: baseline;
  padding: 10px 16px 12px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: #fff;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.sc-tab:hover { border-color: rgba(30, 86, 168, .4); }
.sc-tab:focus-visible { outline: 3px solid rgba(51, 187, 255, .55); outline-offset: 2px; }
.sc-tab.is-active {
  border-color: rgba(255, 106, 0, .5);
  background: linear-gradient(180deg, #FFF6EF, #fff 70%);
  box-shadow: 0 6px 18px rgba(255, 106, 0, .12);
}
.sc-tab-num { font-family: var(--font-num); font-size: 13px; font-weight: 700; color: #B9C7DC; transition: color .2s ease; }
.sc-tab.is-active .sc-tab-num { color: var(--c-accent); }
.sc-tab-title { font-size: 16px; font-weight: 700; line-height: 1.3; color: var(--ink-1); }
.sc-tab-title em { font-style: normal; color: var(--c-accent); }
.sc-tab-desc { grid-column: 1 / -1; font-size: 13px; line-height: 1.6; color: var(--ink-3); }
.sc-tab.is-active .sc-tab-desc { color: var(--ink-2); }
.sc-tab-bar {
  position: absolute;
  left: 0; bottom: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--c-accent-2), var(--c-accent));
}
/* 关闭自动轮播时（如系统偏好减少动态效果）隐藏进度条 */
.showcase.no-autoplay .sc-tab-bar { display: none; }

/* ==================== S2 训练营亮点 ==================== */
.s2-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.hl-card {
  position: relative;
  overflow: hidden;
  padding: 30px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
}
.hl-num {
  position: absolute;
  top: 6px; right: 16px;
  font-family: var(--font-num);
  font-size: 64px;
  line-height: 1;
  font-weight: 700;
  color: rgba(18, 59, 122, .06);
}
.hl-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  margin-bottom: 16px;
  background: rgba(30, 86, 168, .08);
  color: var(--c-primary-3);
}
.hl-icon .icon { width: 24px; height: 24px; }
.hl-card h3 { margin-bottom: 8px; font-size: 18px; color: var(--ink-1); }
.hl-card p { font-size: 14px; }

/* 往期成果数据条 */
.stats {
  position: relative;
  margin-top: 40px;
  padding: 44px 24px 36px;
  border-radius: var(--radius-l);
  background: linear-gradient(120deg, #081836, var(--c-primary) 55%, var(--c-primary-2));
  overflow: hidden;
}
.stats::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}
.stats-grid { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); }
.stat { position: relative; text-align: center; padding: 0 12px; }
.stat + .stat::before {
  content: "";
  position: absolute;
  left: 0; top: 12%; bottom: 12%;
  width: 1px;
  background: rgba(255, 255, 255, .14);
}
.stat-num {
  font-family: var(--font-num);
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: #fff;
}
.stat-num i { font-style: normal; margin-left: 4px; font-size: .45em; font-weight: 500; color: rgba(255, 255, 255, .75); }
.stat-label { margin-top: 10px; font-size: 14px; color: rgba(255, 255, 255, .65); }
.stats-note { position: relative; margin-top: 22px; text-align: center; font-size: 12px; color: rgba(255, 255, 255, .4); }

/* ==================== S3 课程安排（时间轴） ==================== */
.tl { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.tl::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 10%; right: 10%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-primary-3) 60%, var(--c-accent));
  opacity: .4;
}
.tl-node {
  position: relative;
  z-index: 1;
  width: 48px; height: 48px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 11px; font-weight: 700; letter-spacing: .5px;
  color: #fff;
  background: linear-gradient(135deg, var(--c-primary-3), var(--c-primary));
  box-shadow: 0 0 0 5px rgba(30, 86, 168, .15), 0 6px 14px rgba(10, 31, 77, .3);
}
.tl-node--final { background: linear-gradient(135deg, var(--c-accent-2), var(--c-accent)); box-shadow: 0 0 0 5px rgba(255, 106, 0, .15), 0 6px 14px rgba(255, 106, 0, .3); }
.tl-card {
  margin-top: 20px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
  min-height: 190px;
}
.tl-card h3 { font-size: 15px; line-height: 1.45; color: var(--ink-1); min-height: 44px; }
.tl-out { display: flex; gap: 7px; align-items: flex-start; font-size: 13px; color: var(--ink-2); }
.tl-out .icon { width: 14px; height: 14px; margin-top: 3px; color: var(--c-cyan); }
.tl-dur {
  margin-top: auto;
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-primary-3);
  background: rgba(30, 86, 168, .07);
}
.s3-note-wrap { margin-top: 36px; text-align: center; }
.s3-note {
  display: inline-block;
  padding: 10px 18px;
  border: 1px dashed #D4DDEA;
  border-radius: 999px;
  background: var(--bg-alt);
  font-size: 13px;
  color: var(--ink-3);
}

/* ==================== S4 适合人群 ==================== */
.s4-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.persona-card {
  padding: 32px 24px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
}
.persona-icon {
  width: 60px; height: 60px;
  margin: 0 auto 16px;
  border-radius: 18px;
  display: grid; place-items: center;
  color: #fff;
}
.persona-icon .icon { width: 28px; height: 28px; }
.persona-icon--1 { background: linear-gradient(135deg, var(--c-cyan), var(--c-primary-3)); box-shadow: 0 8px 18px rgba(0, 200, 212, .3); }
.persona-icon--2 { background: linear-gradient(135deg, var(--c-primary-3), var(--c-primary)); box-shadow: 0 8px 18px rgba(30, 86, 168, .3); }
.persona-icon--3 { background: linear-gradient(135deg, var(--c-accent-2), var(--c-accent)); box-shadow: 0 8px 18px rgba(255, 106, 0, .3); }
.persona-card h3 { margin-bottom: 8px; font-size: 17px; color: var(--ink-1); }
.persona-card p { font-size: 14px; }

.gains {
  margin-top: 40px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(180deg, #F8FBFF, #fff);
}
.gains h3 { text-align: center; margin-bottom: 24px; font-size: 18px; color: var(--ink-1); }
.gains-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 32px; max-width: 720px; margin: 0 auto; }
.gains-grid li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--ink-2); }
.gain-check {
  width: 22px; height: 22px;
  flex: none;
  border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(0, 200, 212, .12);
  color: var(--c-cyan);
}
.gain-check .icon { width: 12px; height: 12px; }

/* ==================== S5 激励与认证 ==================== */
.prize-block { margin-top: 48px; }
.prize-block:first-of-type { margin-top: 0; }
.prize-block-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 18px; flex-wrap: wrap; }
.prize-block-head h3 { font-size: 18px; color: var(--ink-1); }
.prize-block-head span { font-size: 13px; color: var(--ink-3); }

.prizes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.prize-card {
  padding: 14px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
}
.prize-img {
  height: 110px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1.5px dashed #C9D4E4;
  border-radius: 10px;
  background: #FAFCFE;
  color: var(--ink-3);
}
.prize-img .icon { width: 26px; height: 26px; }
.prize-img span { font-size: 11px; }
.prize-name { margin-top: 10px; font-size: 13px; color: var(--ink-2); }

.tiers { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 16px; align-items: stretch; }
.tier {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
}
.tier--1 {
  background: linear-gradient(135deg, #0E2655, var(--c-primary-2));
  border: 0;
  box-shadow: 0 16px 40px rgba(10, 31, 77, .35);
}
.tier-rank {
  align-self: flex-start;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: var(--c-primary-3);
  background: rgba(30, 86, 168, .08);
}
.tier--1 .tier-rank { background: linear-gradient(135deg, var(--c-accent-2), var(--c-accent)); color: #fff; }
.tier-name { font-size: 15px; font-weight: 600; line-height: 1.5; color: var(--ink-1); }
.tier--1 .tier-name { color: #fff; }
.tier-value { margin-top: auto; font-family: var(--font-num); font-size: 12px; font-weight: 700; color: var(--c-accent); }
.tier--1 .tier-value { color: var(--c-accent-2); }

.cert-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  align-items: center;
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
}
.cert-img {
  height: 170px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1.5px dashed #C9D4E4;
  border-radius: 12px;
  background: #FAFCFE;
  color: var(--ink-3);
  font-size: 12px;
}
.cert-img .icon { width: 34px; height: 34px; color: var(--c-primary-3); opacity: .7; }
.cert-info h3 { font-size: 18px; color: var(--ink-1); }
.cert-info p { margin-top: 8px; font-size: 14px; }
.cert-name { display: inline-block; margin-top: 12px; padding: 6px 12px; border-radius: 8px; font-size: 13px; color: var(--c-primary-3); background: rgba(30, 86, 168, .07); }
.s5-compliance { margin-top: 32px; text-align: center; font-size: 12px; color: var(--ink-3); }

/* ==================== S6 参与流程 ==================== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step {
  position: relative;
  padding: 26px 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
}
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%; right: -14px;
  transform: translateY(-50%);
  border: 7px solid transparent;
  border-left-color: #B9C7DC;
}
.step-num {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: grid; place-items: center;
  margin-bottom: 14px;
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--c-cyan), var(--c-primary-3));
  box-shadow: 0 6px 14px rgba(30, 86, 168, .25);
}
.step h3 { margin-bottom: 6px; font-size: 16px; color: var(--ink-1); }
.step p { font-size: 13px; }

.preps-title { margin: 40px 0 16px; text-align: center; font-size: 18px; color: var(--ink-1); }
.preps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.prep { padding: 22px; border-radius: var(--radius-m); background: #fff; border: 1px solid var(--line); }
.prep-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: grid; place-items: center;
  margin-bottom: 12px;
  background: rgba(30, 86, 168, .07);
  color: var(--c-primary-3);
}
.prep-icon .icon { width: 20px; height: 20px; }
.prep h3 { margin-bottom: 6px; font-size: 15px; color: var(--ink-1); }
.prep p { font-size: 13px; }
.inline-link { color: var(--c-primary-3); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

/* ==================== S7 常见问题 ==================== */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-1);
}
.faq-chev { width: 18px; height: 18px; color: var(--ink-3); transition: transform .25s ease; }
.faq-item.is-open .faq-chev { transform: rotate(180deg); color: var(--c-primary-3); }
.faq-a { overflow: hidden; max-height: 0; transition: max-height .3s ease; }
.faq-a-inner { padding: 0 22px 20px; font-size: 14px; line-height: 1.75; color: var(--ink-2); }
.faq-more { margin-top: 28px; text-align: center; font-size: 14px; color: var(--ink-3); }
.faq-more a { color: var(--c-primary-3); font-weight: 600; }

/* ==================== S8 底部 CTA + 页脚 ==================== */
.s8 {
  position: relative;
  overflow: hidden;
  padding: 88px 0 0;
  background: linear-gradient(135deg, #081836, var(--c-primary) 55%, var(--c-primary-2));
  color: #fff;
}
.s8::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(120, 170, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 170, 255, .06) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.s8-inner { position: relative; text-align: center; padding-bottom: 64px; }
.s8-inner h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 700; }
.s8-sub { margin-top: 12px; font-size: 16px; color: rgba(255, 255, 255, .7); }
.s8-cta { margin-top: 32px; display: flex; justify-content: center; align-items: center; gap: 20px; flex-wrap: wrap; }

.s8-contact { margin-top: 44px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.qr-box {
  width: 128px; height: 128px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1.5px dashed rgba(255, 255, 255, .35);
  border-radius: var(--radius-m);
  background: rgba(255, 255, 255, .05);
  color: rgba(255, 255, 255, .55);
  font-size: 11px;
}
.qr-box .icon { width: 26px; height: 26px; }
.s8-contact p { font-size: 14px; color: rgba(255, 255, 255, .75); }

.footer { position: relative; border-top: 1px solid rgba(255, 255, 255, .12); padding: 22px 0; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: rgba(255, 255, 255, .5);
}

/* ==================== 移动端吸底报名栏 ==================== */
.sticky-bar {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 100;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: rgba(8, 24, 54, .94);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, .1);
}
.sticky-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.sticky-info .countdown-label { font-size: 12px; color: rgba(255, 255, 255, .6); }
.sticky-time {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-num);
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}
.sticky-time b { color: var(--c-accent-2); }
.sticky-time span { font-family: var(--font-sans); font-size: 12px; font-weight: 400; color: rgba(255, 255, 255, .75); }
.sticky-bar .btn { min-height: 44px; padding: 0 22px; font-size: 15px; }

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
  .tl-card h3 { min-height: 66px; }
  .showcase { grid-template-columns: 1.35fr 1fr; gap: 20px; } /* 舞台占比微调，选项卡保持可读 */
}

@media (max-width: 767px) {
  body { padding-bottom: 76px; } /* 为吸底栏让位 */
  .sticky-bar { display: flex; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 40px; }
  .section-head h2 { font-size: 24px; }

  /* Hero */
  .hero { padding: calc(var(--topbar-h) + 24px) 0 72px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-title { font-size: 30px; }
  .hero-sub { font-size: 14px; letter-spacing: 1px; }
  .hero-cta { gap: 14px; }
  .btn--xl { width: 100%; min-width: 0; }
  .countdown { padding: 10px 16px; }
  .countdown-time { font-size: 18px; }
  .countdown-time b { font-size: 20px; }
  /* Hero — 手机端隐藏 CSS 主视觉占位，留纯深色渐变背景 */
  .hero-visual { display: none; }
  .brand-name { font-size: 15px; }

  /* S1 五维轮播：改纵向，说明仅激活项展开（类手风琴，节省纵向空间） */
  .s1-tagline { margin-top: -20px; font-size: 17px; }
  .showcase { grid-template-columns: 1fr; gap: 16px; margin-top: 36px; }
  .sc-tab-desc { display: none; }
  .sc-tab.is-active .sc-tab-desc { display: block; }

  /* S2 */
  .s2-cards { grid-template-columns: 1fr; }
  .stats { padding: 32px 12px 26px; }
  .stats-grid { grid-template-columns: 1fr; gap: 22px; }
  .stat + .stat::before { left: 25%; right: 25%; top: -12px; bottom: auto; width: auto; height: 1px; }

  /* S3 时间轴：横向改纵向 */
  .tl { grid-template-columns: 1fr; gap: 18px; }
  .tl::before { top: 8px; bottom: 8px; left: 23px; right: auto; width: 2px; height: auto; }
  .tl-item { display: grid; grid-template-columns: 48px 1fr; gap: 16px; }
  .tl-node { margin: 0; }
  .tl-card { margin-top: 0; min-height: 0; }
  .tl-card h3 { min-height: 0; }

  /* S4 */
  .s4-cards { grid-template-columns: 1fr; }
  .gains-grid { grid-template-columns: 1fr; }

  /* S5 */
  .prizes { grid-template-columns: repeat(2, 1fr); }
  .tiers { grid-template-columns: 1fr; }
  .cert-card { grid-template-columns: 1fr; }
  .cert-img { height: 150px; }

  /* S6 */
  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }
  .preps { grid-template-columns: 1fr; }

  /* S8 */
  .s8 { padding-top: 64px; }
  .s8-cta { flex-direction: column; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .topbar-right .btn { display: none; } /* 极窄屏隐藏顶栏 CTA，吸底栏仍在 */
  .container { width: min(var(--container), 100% - 32px); }
  .prizes { grid-template-columns: 1fr 1fr; }
}