/* ==========================================================================
   APO 航空宣讲官 · 星海美学设计系统
   --------------------------------------------------------------------------
   设计原则：大气 / 国际化 / 航空硬科技质感，但去框线化 ——
   不用坐标网格、不用切角面板、不用数据角标，用「柔光 + 大留白 +
   大字号 + 圆角」组织页面。深空氛围靠渐变光晕与星光营造。
   ========================================================================== */

/* ============ 1. 设计令牌（APO 色彩体系 V2 · 空军蓝单色调 · 2026-08-15 确认） ============ */
:root {
  /* 导航高度（logo 大一倍后导航自动撑高：PC 约 96px，手机约 72px，fallback 取 96px） */
  --nav-h: 96px;

  /* ===== 浅色系（主色 #5D8AA8 + 白，10 阶）· 前缀 --afb-{阶} ===== */
  --afb-5:   #EFF3F6;  /* 全局浅背景 surface、卡片浅底、进度条底 */
  --afb-25:  #DFE8EE;  /* 表单底色、分割线-浅 */
  --afb-50:  #CEDCE5;  /* 分割线 line、边框-浅 */
  --afb-75:  #BED0DC;  /* 浅底标签底色（原 --blue-100） */
  --afb-100: #AEC5D4;  /* 禁用态边框、占位符辅助 */
  --afb-150: #9EB9CB;  /* 冷色高亮边 */
  --afb-200: #8EADC2;  /* 图标辉光 light（原 --cyan-light / --blue-300） */
  --afb-300: #7DA1B9;  /* hover 边框 */
  --afb-400: #6D96B1;  /* 链接色-弱化 */
  --afb-500: #5D8AA8;  /* 中心点主色：品牌青 / 链接 / 次级按钮 / 图标辉光，原名 --cyan / --blue-500 */

  /* ===== 深色系（主色 + 黑，10 阶）· 前缀 --afb-{阶} ===== */
  --afb-600: #547C97;  /* 辅助文字 muted、标题次级（原 --blue-900 / --space-900） */
  --afb-700: #4A6E86;  /* 按钮深色主背景渐变起点（原 --space-800） */
  --afb-800: #416176;  /* 玻璃导航背景（原 --space-700） */
  --afb-900: #385365;  /* 主按钮背景、关键深色标题 ink-2（原 --blue-700），按钮必须纯色 + 999px 圆角 */
  --afb-950: #2F4554;  /* 视觉卡背景渐变终点、Hero 渐变中间 */
  --afb-970: #253743;  /* 视觉卡深空底 */
  --afb-980: #1C2932;  /* Hero/页脚渐变终点、视觉卡深空底起点（原 --space-950 错误旧名），与 --afb-900 组合是唯一允许的同色相渐变 */
  --afb-990: #131C22;  /* 正文主色 ink（最深），原名 --ink #0F1B2D 废弃 */
  --afb-995: #090E11;  /* 页面最深背景（仅极端场景使用） */

  /* ===== 语义表面色（严格映射自上梯阶，禁止独立硬编码） ===== */
  --surface: var(--afb-5);    /* #EFF3F6  全局浅色模块背景（替代旧 #F6F8FB） */
  --ink:     var(--afb-990);  /* #131C22  正文/标题最深文字 */
  --ink-2:   var(--afb-900);  /* #385365  次级正文 */
  --muted:   var(--afb-600);  /* #547C97  辅助说明文字（替代旧 #5B6B81） */
  --line:    var(--afb-50);   /* #CEDCE5  分割线/边框（替代旧 #E3EAF3） */

  /* ===== 金色（仅成就/徽章/重点提示/金按钮，严禁作大面积主背景） ===== */
  --gold:       #F7CF7B;
  --gold-light: #FFE4A3;

  /* ===== 五大宣讲方向专属色（跨色相，仅方向卡标签/图标点缀，严禁跨色相渐变混用） ===== */
  --c-explore: #E86A4A;  /* 科学 · 航空探秘（橙） */
  --c-memory:  #D95B8A;  /* 人文 · 航空记忆（玫红） */
  --c-tech:    #5D8AA8;  /* 工具 · 智创未来（空军蓝主色） */
  --c-craft:   #4CAF7A;  /* 工程 · 巧手筑翼（绿） */
  --c-ai:      #3B6CB8;  /* 未来 · 科幻+AI（深蓝） */

  /* ===== 旧变量别名（兼容现有 style.css 内部引用，禁止新代码使用） ===== */
  --space-950: var(--afb-500);  /* 旧命名明度错误，实际色值是主色 */
  --space-900: var(--afb-600);  /* 旧命名明度错误，实际色值是 muted */
  --space-800: var(--afb-700);  /* 旧命名明度错误，实际色值是渐变起点 */
  --space-700: var(--afb-800);  /* 旧命名明度错误，实际色值是玻璃背景 */
  --blue-900:  var(--afb-600);
  --blue-700:  var(--afb-900);
  --blue-500:  var(--afb-500);
  --blue-300:  var(--afb-200);
  --blue-100:  var(--afb-75);
  --cyan:      var(--afb-500);
  --cyan-light:var(--afb-200);

  /* ===== 字体 ===== */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;

  /* ===== 圆角 ===== */
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;

  /* ===== 阴影 ===== */
  --shadow-card:       0 1px 2px rgba(16, 24, 40, 0.04), 0 24px 56px -28px rgba(56, 83, 101, 0.22);
  --shadow-card-hover: 0 28px 72px -24px rgba(56, 83, 101, 0.32);
  --shadow-float:      0 20px 48px -20px rgba(28, 41, 50, 0.45);

  /* ===== 容器 ===== */
  --container: 1200px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ============ 2. 基础 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: #ffffff;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
  padding-top: 96px;
  font-size: 0; /* 消除固定导航后空白换行产生的行盒（白缝） */
}
body > * { font-size: 16px; line-height: 1.6; }
body.home { padding-top: 0; }
body.standalone { padding-top: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
::selection { background: rgba(93, 138, 168, 0.22); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
@media (min-width: 1024px) { .container { padding: 0 40px; } }
/* 手机端收窄左右留白，接近 App 满宽观感 */
@media (max-width: 640px) { .container { padding: 0 14px; } }

section { position: relative; }

/* ============ 3. 排版 ============ */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--afb-500);
  font-weight: 600;
}
.eyebrow--dark { color: var(--afb-900); }
.eyebrow--gold { color: var(--gold); }

.h1 {
  font-size: clamp(42px, 6.2vw, 76px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: #ffffff;
  text-shadow: 0 2px 40px rgba(28, 41, 50, 0.45);
}
.h2 {
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }

.lead { font-size: 17px; line-height: 1.9; color: var(--muted); }
.lead--light { color: rgba(226, 232, 240, 0.82); }

.mono { font-family: var(--font-mono); }

/* ============ 4. 深空背景（去网格，柔光版） ============ */
.sky {
  position: relative;
  background:
    radial-gradient(1200px 620px at 82% 6%, rgba(93, 138, 168, 0.16) 0%, transparent 58%),
    radial-gradient(1000px 640px at 6% 96%, rgba(56, 83, 101, 0.55) 0%, transparent 62%),
    radial-gradient(720px 420px at 42% 120%, rgba(93, 138, 168, 0.14) 0%, transparent 60%),
    linear-gradient(168deg, #5D8AA8 0%, #547C97 44%, #4A6E86 100%);
  overflow: hidden;
}
/* 星空：细小星光点，闪烁呼吸 */
.stars {
  position: absolute; inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1.4px 1.4px at 12% 22%, rgba(255, 255, 255, 0.9) 50%, transparent 51%),
    radial-gradient(1px 1px at 20% 68%, rgba(255, 255, 255, 0.5) 50%, transparent 51%),
    radial-gradient(1.8px 1.8px at 28% 12%, rgba(255, 255, 255, 0.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 35% 82%, rgba(255, 255, 255, 0.45) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 44% 34%, rgba(255, 255, 255, 0.7) 50%, transparent 51%),
    radial-gradient(1px 1px at 53% 8%, rgba(255, 255, 255, 0.5) 50%, transparent 51%),
    radial-gradient(1.3px 1.3px at 61% 58%, rgba(255, 255, 255, 0.65) 50%, transparent 51%),
    radial-gradient(1px 1px at 70% 88%, rgba(255, 255, 255, 0.4) 50%, transparent 51%),
    radial-gradient(1.6px 1.6px at 78% 26%, rgba(255, 255, 255, 0.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 86% 66%, rgba(255, 255, 255, 0.5) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 92% 40%, rgba(255, 255, 255, 0.7) 50%, transparent 51%),
    radial-gradient(1px 1px at 8% 46%, rgba(255, 255, 255, 0.4) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 48% 92%, rgba(255, 255, 255, 0.5) 50%, transparent 51%);
  animation: twinkle 7s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: 0.55; } to { opacity: 1; } }

/* 大气层光晕 */
.glow { position: absolute; border-radius: 50%; filter: blur(70px); pointer-events: none; }

/* ============ 满屏 Banner Hero（左文 + 右 banner） ============ */
.sky-banner { position: relative; overflow: hidden; background: linear-gradient(135deg, #06142B 0%, #0B2042 60%, #142E5C 100%); }
.banner-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: 60% center;
  animation: banner-zoom 18s ease-in-out infinite alternate;
}
@keyframes banner-zoom { from { transform: scale(1); } to { transform: scale(1.06); } }
.banner-tint {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background:
    linear-gradient(90deg, #06142B 0%, #06142B 38%, rgba(6, 20, 43, 0.78) 48%, rgba(6, 20, 43, 0.30) 58%, rgba(6, 20, 43, 0) 72%),
    linear-gradient(180deg, rgba(6, 20, 43, 0.40) 0%, rgba(6, 20, 43, 0) 25%, rgba(6, 20, 43, 0) 65%, rgba(6, 20, 43, 0.55) 100%);
}
@media (max-width: 768px) {
  .banner-bg { background-position: 72% center; background-size: cover; }
  .banner-tint {
    background:
      linear-gradient(90deg, #06142B 0%, rgba(6, 20, 43, 0.92) 50%, rgba(6, 20, 43, 0.55) 100%),
      linear-gradient(180deg, rgba(6, 20, 43, 0.30) 0%, rgba(6, 20, 43, 0) 30%, rgba(6, 20, 43, 0) 70%, rgba(6, 20, 43, 0.55) 100%);
  }
}

/* ============ 雷达扫描（Logo 背景装饰） ============ */
.radar { position: relative; width: 440px; height: 440px; flex: none; }
.radar-ring {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  border-radius: 50%; border: 1px solid rgba(142, 173, 194, 0.26); pointer-events: none;
}
.radar-ring.r1 { width: 100%; height: 100%; }
.radar-ring.r2 { width: 68%; height: 68%; border-style: dashed; border-color: rgba(142, 173, 194, 0.20); }
.radar-ring.r3 { width: 36%; height: 36%; border-color: rgba(142, 173, 194, 0.34); box-shadow: 0 0 18px rgba(142, 173, 194, 0.18); }
.radar-cross {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: 100%; height: 100%; border-radius: 50%; pointer-events: none;
  background:
    linear-gradient(rgba(142, 173, 194, 0.16), rgba(142, 173, 194, 0.16)) 50% 0 / 1px 100% no-repeat,
    linear-gradient(rgba(142, 173, 194, 0.16), rgba(142, 173, 194, 0.16)) 0 50% / 100% 1px no-repeat;
}
.radar-sweep {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: 100%; height: 100%; border-radius: 50%; pointer-events: none;
  background: conic-gradient(from 0deg, rgba(142, 173, 194, 0.42) 0deg, rgba(142, 173, 194, 0) 52deg, rgba(142, 173, 194, 0) 360deg);
  animation: radar-spin 4.5s linear infinite;
}
@keyframes radar-spin { to { transform: translate(-50%, -50%) rotate(360deg); } }
.radar-ping {
  position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px 0 0 -5px;
  border-radius: 50%; background: var(--afb-500); box-shadow: 0 0 14px 2px rgba(142, 173, 194, 0.7); pointer-events: none;
}
.radar-ping::after {
  content: ''; position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px 0 0 -5px;
  border-radius: 50%; border: 1px solid rgba(142, 173, 194, 0.6);
  animation: ping 2.8s ease-out infinite;
}
@keyframes ping { 0% { transform: scale(1); opacity: 0.85; } 100% { transform: scale(24); opacity: 0; } }

/* 漂浮（纸飞机 / 图标） */
.float-slow { animation: floaty 7s ease-in-out infinite; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* 滚动提示 */
.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: rgba(255, 255, 255, 0.45); font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.3em; text-transform: uppercase;
}
.scroll-hint .bar { width: 1.5px; height: 34px; background: linear-gradient(rgba(255,255,255,0.7), transparent); animation: drop 2.2s var(--ease) infinite; }
@keyframes drop { 0% { transform: scaleY(0); transform-origin: top; opacity: 0; } 40% { opacity: 1; } 100% { transform: scaleY(1); transform-origin: top; opacity: 0; } }

/* ============ 5. 导航 ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  background: rgba(65, 97, 118, 0.97);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: none;
  box-shadow: 0 6px 22px rgba(15, 30, 42, 0.18);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: auto; padding: 10px 0; }
.nav-brand { display: flex; align-items: center; gap: 14px; }
.nav-brand img { height: 76px; width: auto; object-fit: contain; }
.nav-brand-name { line-height: 1.15; }
.nav-brand-name b { display: block; color: #fff; font-size: 19px; font-weight: 800; letter-spacing: 0.01em; }
.nav-brand-name span { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.24em; color: rgba(142,173,194,0.85); text-transform: uppercase; }
.nav-links { display: none; align-items: center; gap: 34px; }
@media (min-width: 1024px) { .nav-links { display: flex; } }
.nav-links a {
  position: relative; font-size: 14.5px; font-weight: 600; color: rgba(226, 232, 240, 0.78);
  padding: 6px 2px; transition: color 0.25s;
}
.nav-links a:hover { color: #fff; }
.nav-links a::after {
  content: ""; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 0; height: 2px; border-radius: 2px; background: var(--afb-500);
  transition: width 0.3s var(--ease); box-shadow: 0 0 10px rgba(93, 138, 168, 0.8);
}
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: #fff; }
.nav-links a.active::after { width: 100%; }
.nav-actions { display: none; align-items: center; gap: 14px; }
@media (min-width: 1024px) { .nav-actions { display: flex; } }
.nav-toggle { display: flex; align-items: center; justify-content: center; width: 42px; height: 42px; border-radius: 12px; color: #fff; }
.nav-toggle:hover { background: rgba(255, 255, 255, 0.08); }
@media (min-width: 1024px) { .nav-toggle { display: none; } }

/* 导航 · 登录态用户卡片 */
.nav-user {
  display: flex; align-items: center; gap: 10px;
  padding: 5px 14px 5px 5px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(247,207,123,0.38);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  text-decoration: none;
  transition: all 0.2s;
}
.nav-user:hover {
  background: rgba(247,207,123,0.14);
  border-color: rgba(247,207,123,0.6);
  transform: translateY(-1px);
}
.nav-user-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg,#F7CF7B 0%,#E5BC67 100%);
  color: #1C2932; font-weight: 900; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 8px rgba(247,207,123,0.3), inset 0 1px 0 rgba(255,255,255,0.35);
  flex-shrink: 0;
}
.nav-user-meta { display: flex; flex-direction: column; line-height: 1.15; }
.nav-user-greet { font-size: 11.5px; color: rgba(255,255,255,0.7); }
.nav-user-name { font-size: 14px; font-weight: 800; color: #fff; margin-top: 2px; }
.nav-user-apo { font-size: 10.5px; color: #F7CF7B; margin-top: 2px; font-family: var(--font-mono); letter-spacing: 0.6px; }
.nav-user-dot {
  width: 9px; height: 9px; border-radius: 50%; margin-left: 4px;
  background: #10b981; flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(16,185,129,0.22), 0 0 8px rgba(16,185,129,0.6);
  animation: pulseDot 2s ease-in-out infinite;
}
@keyframes pulseDot {
  0%,100% { box-shadow: 0 0 0 3px rgba(16,185,129,0.22), 0 0 6px rgba(16,185,129,0.5); }
  50%     { box-shadow: 0 0 0 5px rgba(16,185,129,0.14), 0 0 12px rgba(16,185,129,0.75); }
}
.nav-logout-btn {
  padding: 8px 16px; border-radius: 999px;
  background: transparent; color: rgba(255,255,255,0.75);
  border: 1px solid rgba(255,255,255,0.2);
  font-size: 13px; font-weight: 600;
  transition: all 0.2s; cursor: pointer;
}
.nav-logout-btn:hover {
  background: rgba(239,68,68,0.15);
  border-color: rgba(239,68,68,0.6);
  color: #fff;
}

/* 移动端菜单 */
.mobile-menu {
  display: none; padding: 12px 24px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(28, 41, 50, 0.92);
}
.mobile-menu.open { display: block; }
.mobile-menu a { display: block; padding: 12px 14px; border-radius: 12px; color: rgba(255,255,255,0.85); font-weight: 600; font-size: 15px; }
.mobile-menu a:hover { background: rgba(255, 255, 255, 0.07); }

/* ============ 6. 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 15px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 700; letter-spacing: 0.01em;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s;
  white-space: nowrap;
}
.btn .icon { width: 18px; height: 18px; }
.btn-primary {
  background: linear-gradient(135deg, #5D8AA8 0%, #385365 100%);
  color: #fff; box-shadow: 0 14px 30px -10px rgba(93, 138, 168, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 44px -12px rgba(93, 138, 168, 0.7); }
.btn-ghost-light { border: 1px solid rgba(255, 255, 255, 0.3); color: #fff; background: rgba(255,255,255,0.04); backdrop-filter: blur(8px); }
.btn-ghost-light:hover { background: rgba(255, 255, 255, 0.1); transform: translateY(-2px); }
.btn-white { background: #fff; color: var(--afb-600); box-shadow: 0 14px 30px -12px rgba(28,41,50,0.45); }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 20px 44px -14px rgba(28,41,50,0.5); }
.btn-ghost-dark { border: 1px solid var(--afb-200); color: var(--afb-900); background: #fff; }
.btn-ghost-dark:hover { background: var(--afb-75); transform: translateY(-2px); }
.btn-sm { padding: 11px 22px; font-size: 14px; }
.btn-sm .icon { width: 16px; height: 16px; }
.btn:focus-visible { outline: 2px solid var(--afb-500); outline-offset: 3px; }

/* ============ 7. 卡片 ============ */
.card {
  background: #fff; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card-hover); }
.card-dark {
  background: linear-gradient(168deg, rgba(65, 97, 118, 0.92) 0%, rgba(28, 41, 50, 0.97) 100%);
  color: #fff;
}
/* 可点击整卡 */
.card-link { display: block; }

/* 卡片顶部视觉图：方向渐变 + 图标辉光（无网格） */
.visual {
  position: relative; height: 190px; display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.visual .icon { width: 78px; height: 78px; color: rgba(255, 255, 255, 0.92); filter: drop-shadow(0 0 20px rgba(93, 138, 168, 0.5)); transition: transform 0.55s var(--ease); }
.card:hover .visual .icon { transform: scale(1.14) rotate(-5deg); }
/* 每个方向的专属视觉渐变 */
.v-explore { background: radial-gradient(300px 160px at 74% 16%, rgba(232, 106, 74, 0.4) 0%, transparent 62%), radial-gradient(240px 160px at 18% 96%, rgba(93, 138, 168, 0.2) 0%, transparent 60%), linear-gradient(150deg, #1C2932 0%, #131C22 100%); }
.v-memory  { background: radial-gradient(300px 160px at 72% 18%, rgba(217, 91, 138, 0.4) 0%, transparent 62%), radial-gradient(240px 160px at 20% 94%, rgba(247, 207, 123, 0.16) 0%, transparent 60%), linear-gradient(150deg, #1C2932 0%, #131C22 100%); }
.v-tech    { background: radial-gradient(300px 160px at 74% 16%, rgba(93, 138, 168, 0.42) 0%, transparent 62%), radial-gradient(240px 160px at 18% 96%, rgba(59, 108, 184, 0.35) 0%, transparent 60%), linear-gradient(150deg, #4A6E86 0%, #547C97 100%); }
.v-craft   { background: radial-gradient(300px 160px at 74% 16%, rgba(76, 175, 122, 0.38) 0%, transparent 62%), radial-gradient(240px 160px at 18% 96%, rgba(93, 138, 168, 0.2) 0%, transparent 60%), linear-gradient(150deg, #1C2932 0%, #131C22 100%); }
.v-ai      { background: radial-gradient(300px 160px at 74% 16%, rgba(59, 108, 184, 0.5) 0%, transparent 62%), radial-gradient(240px 160px at 18% 96%, rgba(217, 91, 138, 0.18) 0%, transparent 60%), linear-gradient(150deg, #416176 0%, #547C97 100%); }
.v-course  { background: radial-gradient(280px 150px at 72% 18%, rgba(93, 138, 168, 0.35) 0%, transparent 62%), radial-gradient(220px 150px at 20% 96%, rgba(56, 83, 101, 0.6) 0%, transparent 60%), linear-gradient(150deg, #4A6E86 0%, #547C97 100%); }

/* 标签 chip */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
}
.chip-hot   { background: rgba(247, 207, 123, 0.16); color: var(--gold-light); border: 1px solid rgba(247, 207, 123, 0.4); }
.chip-new   { background: rgba(95, 197, 240, 0.16); color: #A8E2FA; border: 1px solid rgba(95, 197, 240, 0.45); }
.chip-rec   { background: rgba(255, 255, 255, 0.9); color: var(--afb-900); border: none; }
.chip-dark  { background: rgba(255, 255, 255, 0.06); color: rgba(255, 255, 255, 0.7); border: 1px solid rgba(255, 255, 255, 0.12); }
.chip-explore { background: #E86A4A; color: #FFFFFF; border: 1.5px solid #E86A4A; box-shadow: 0 4px 14px -4px rgba(232, 106, 74, 0.6); }
.chip-memory  { background: #D95B8A; color: #FFFFFF; border: 1.5px solid #D95B8A; box-shadow: 0 4px 14px -4px rgba(217, 91, 138, 0.6); }
.chip-tech    { background: #5D8AA8; color: #FFFFFF; border: 1.5px solid #5D8AA8; box-shadow: 0 4px 14px -4px rgba(93, 138, 168, 0.6); }
.chip-craft   { background: #4CAF7A; color: #FFFFFF; border: 1.5px solid #4CAF7A; box-shadow: 0 4px 14px -4px rgba(76, 175, 122, 0.6); }
.chip-ai      { background: #3B6CB8; color: #FFFFFF; border: 1.5px solid #3B6CB8; box-shadow: 0 4px 14px -4px rgba(59, 108, 184, 0.6); }
.chip-soft    { background: var(--afb-75); color: var(--afb-900); border: none; }

/* ============ 8. 统计 ============ */
.stat { text-align: left; }
.stat-num { font-family: var(--font-mono); font-size: clamp(30px, 3.6vw, 46px); font-weight: 800; color: #fff; letter-spacing: -0.02em; line-height: 1; white-space: nowrap; }
.stat-num em { font-style: normal; color: var(--afb-500); }
.stat-num--gold { color: var(--gold); }
.stat-label { margin-top: 8px; font-size: 12px; letter-spacing: 0.14em; color: rgba(226, 232, 240, 0.55); }

/* ============ 9. 进度条 ============ */
.progress { height: 8px; border-radius: 999px; background: #E8EEF6; overflow: hidden; }
.progress > span { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--afb-900), var(--afb-500)); }

/* ============ 10. 头像 ============ */
.avatar {
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; font-weight: 800;
  background: linear-gradient(145deg, var(--afb-500), var(--afb-600));
  color: #fff; box-shadow: 0 12px 28px -10px rgba(56, 83, 101, 0.6);
}
.avatar-sm { width: 44px; height: 44px; font-size: 17px; }
.avatar-lg { width: 80px; height: 80px; font-size: 30px; }
.avatar-xl { width: 96px; height: 96px; font-size: 36px; }

/* ============ 11. 列表行（学习进度条目） ============ */
.row-item {
  display: flex; gap: 18px; align-items: center;
  padding: 18px 20px; border-radius: var(--radius-md);
  background: #fff; transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.row-item:hover { transform: translateX(4px); box-shadow: 0 14px 34px -18px rgba(56, 83, 101, 0.4); }

/* ============ 12. 页脚 ============ */
.footer { background: linear-gradient(180deg, #547C97 0%, #5D8AA8 100%); color: #fff; position: relative; overflow: hidden; }
.footer a { color: rgba(226, 232, 240, 0.66); transition: color 0.25s; }
.footer a:hover { color: var(--afb-200); }
.footer-title { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase; color: rgba(95, 197, 240, 0.8); margin-bottom: 20px; }
.footer-link { display: block; padding: 6px 0; font-size: 14px; }

/* ============ 13. 其他工具类 ============ */
.divider-light { border: none; height: 1px; background: linear-gradient(90deg, transparent, rgba(95, 197, 240, 0.18), transparent); }
.divider-dark { border: none; height: 1px; background: linear-gradient(90deg, transparent, #DCE6F2, transparent); }

/* ===== APO Icon：品牌专属图标，SVG Sprite 统一渲染 ===== */
.icon {
  width: 1em; height: 1em; display: inline-block; vertical-align: -0.125em;
  fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0;
}
.icon-solid { fill: currentColor; stroke: none; }

/* ============ 14. 无障碍：减弱动效 ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

/* ============ 15. 响应式布局 ============ */
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 56px; align-items: center; }
.hero-art { display: none; position: relative; }
.track-layout { display: grid; grid-template-columns: 1fr; gap: 48px; align-items: center; }
.dashboard-grid { display: grid; grid-template-columns: 1fr; gap: 32px; }

@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: 7fr 5fr; }
  .hero-art { display: flex; justify-content: center; }
  .track-layout { grid-template-columns: 1fr 1fr; }
  .track-layout.reversed > div:first-child { order: 2; }
  .dashboard-grid { grid-template-columns: 2fr 1fr; }
  .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
}

@media (max-width: 639px) {
  .visual { height: 150px; }
  .visual .icon { width: 60px; height: 60px; }
  .btn { padding: 13px 24px; }
}

/* ==========================================================================
   16. 内页（航空百科 / 报名）组件
   --------------------------------------------------------------------------
   延续星海美学：大圆角、柔光、克制配色、去框线化。
   ========================================================================== */

/* 16.1 内页 Hero（面包屑 + 大标题） */
.page-hero {
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, var(--afb-600) 0%, var(--afb-500) 100%);
  color: #fff; padding: 120px 0 88px; text-align: center;
}
.page-hero .crumb {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.22em;
  text-transform: uppercase; color: rgba(148, 197, 240, 0.62); margin-bottom: 26px;
}
.page-hero .crumb a { color: rgba(148, 197, 240, 0.62); }
.page-hero .crumb a:hover { color: var(--afb-200); }
.page-hero h1 { font-size: clamp(40px, 5.4vw, 64px); font-weight: 800; letter-spacing: -0.02em; line-height: 1.12; }
.page-hero .lead { max-width: 620px; margin: 22px auto 0; color: rgba(226, 232, 240, 0.9); font-size: 17px; line-height: 1.8; }
.page-hero .eyebrow { color: rgba(226, 232, 240, 0.78); }

/* 16.2 筛选 Tab */
.filter-tabs {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
  margin: 40px auto 0; max-width: 760px;
}
.filter-tab {
  padding: 11px 22px; border-radius: 999px; cursor: pointer;
  font-size: 14px; font-weight: 600; color: rgba(226, 232, 240, 0.72);
  background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.12);
  transition: all 0.28s var(--ease); user-select: none;
}
.filter-tab:hover { color: #fff; background: rgba(255, 255, 255, 0.12); }
.filter-tab.active { color: #fff; background: linear-gradient(145deg, var(--afb-500), var(--afb-900)); border-color: transparent; box-shadow: 0 12px 28px -10px rgba(93, 138, 168, 0.65); }

/* 16.3 表单 */
.form-card { background: #fff; border-radius: var(--radius-lg); padding: 48px; box-shadow: var(--shadow-card); }
.field { margin-bottom: 26px; }
.field-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 700; color: var(--ink); margin-bottom: 10px;
}
.field-label .req { color: var(--c-explore); }
.field-label .mono { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); font-weight: 400; }
.input, .select, .textarea {
  width: 100%; padding: 15px 18px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--line); background: var(--surface);
  font-size: 15px; font-family: var(--font-sans); color: var(--ink);
  transition: border-color 0.25s, box-shadow 0.25s; outline: none;
}
.input::placeholder, .textarea::placeholder { color: #A3B0C3; }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--afb-500); background: #fff;
  box-shadow: 0 0 0 4px rgba(93, 138, 168, 0.12);
}
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 22px) 50%, calc(100% - 17px) 50%; background-size: 5px 5px; background-repeat: no-repeat; cursor: pointer; }
.textarea { resize: vertical; min-height: 110px; line-height: 1.7; }
.form-hint { font-size: 12px; color: var(--muted); margin-top: 8px; line-height: 1.6; }
/* 作品类型按钮（个人/团体） */
.work-type-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border: 1.5px solid #CEDCE5; border-radius: 12px;
  cursor: pointer; font-size: 14px; font-weight: 600; color: #385365;
  transition: all 0.2s ease; flex: 1; user-select: none;
}
.work-type-btn:hover { border-color: #5D8AA8; background: #EFF3F6; }
.work-type-btn.selected {
  border-color: #385365; background: rgba(56, 83, 101, 0.06);
  color: #131C22; box-shadow: 0 0 0 3px rgba(56, 83, 101, 0.1);
}
.work-type-btn input[type="radio"] { margin: 0; }
@media (min-width: 900px) { .form-cols { grid-template-columns: 1fr 1fr; } .signup-layout { grid-template-columns: 7fr 5fr; align-items: start; } }

/* 16.4 报名方向单选卡 */
.track-pick {
  display: grid; grid-template-columns: 1fr; gap: 14px;
}
.track-option {
  position: relative; display: flex; align-items: center; gap: 16px;
  padding: 18px 20px; border-radius: var(--radius-md); cursor: pointer;
  background: var(--surface); border: 1.5px solid var(--line);
  transition: all 0.28s var(--ease);
}
.track-option:hover { border-color: var(--afb-200); }
.track-option.selected {
  border-color: var(--afb-500); background: #F0FAFF;
  box-shadow: 0 10px 26px -14px rgba(93, 138, 168, 0.5);
}
.track-option .dot {
  width: 20px; height: 20px; flex: none; border-radius: 50%;
  border: 2px solid #C6D2E2; display: flex; align-items: center; justify-content: center;
  transition: all 0.25s;
}
.track-option.selected .dot { border-color: var(--afb-500); background: var(--afb-500); box-shadow: inset 0 0 0 4px #fff; }
.track-option .t-ico { width: 42px; height: 42px; flex: none; border-radius: 13px; display: flex; align-items: center; justify-content: center; color: #fff; }
.track-option .t-name { font-size: 15px; font-weight: 800; color: var(--ink); }
.track-option .t-desc { font-size: 12.5px; color: var(--muted); margin-top: 3px; line-height: 1.5; }

/* 16.5 步骤条 */
.steps { display: flex; align-items: flex-start; justify-content: center; gap: 0; flex-wrap: wrap; }
.step { display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; width: 120px; position: relative; }
.step .step-num {
  width: 46px; height: 46px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 15px; font-weight: 700; color: rgba(226, 232, 240, 0.85);
  background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.16);
}
.step.active .step-num { color: #fff; background: linear-gradient(145deg, var(--afb-500), var(--afb-900)); border-color: transparent; box-shadow: 0 12px 26px -8px rgba(93, 138, 168, 0.7); }
.step .step-label { font-size: 12.5px; color: rgba(226, 232, 240, 0.7); font-weight: 600; }
.step.active .step-label { color: var(--afb-200); }
.step + .step::before {
  content: ""; position: absolute; top: 23px; left: -58px; width: 56px; height: 1px;
  background: linear-gradient(90deg, rgba(95, 197, 240, 0.5), rgba(95, 197, 240, 0.12));
}
@media (min-width: 640px) { .track-pick { grid-template-columns: 1fr 1fr; } }

/* 16.6 成功提示 */
.success-panel {
  border-radius: var(--radius-lg); padding: 72px 48px; text-align: center; color: #fff;
  background: linear-gradient(180deg, var(--afb-600), var(--afb-500)); position: relative; overflow: hidden;
}
.success-panel .ok-ring { width: 96px; height: 96px; margin: 0 auto 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: linear-gradient(145deg, var(--afb-500), var(--afb-900)); box-shadow: 0 18px 44px -12px rgba(93, 138, 168, 0.7); animation: pop 0.5s var(--ease); }
@keyframes pop { 0% { transform: scale(0.6); opacity: 0; } 70% { transform: scale(1.06); } 100% { transform: scale(1); opacity: 1; } }

/* 手机端 Hero 优化 */
@media (max-width: 768px) {
  :root { --nav-h: 72px; }
  /* 导航：强制隐藏桌面按钮，只显汉堡菜单 */
  .nav-actions { display: none !important; }
  .nav-brand { gap: 10px; }
  .nav-brand img { height: 56px; }
  .nav-brand-name b { font-size: 15px; }
  .nav-brand-name span { font-size: 8px; letter-spacing: 0.16em; }
  .nav-inner { padding: 8px 14px !important; }
  /* Hero */
  .sky {
    padding: 70px 0 0 !important;
    min-height: 100dvh !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: stretch !important;
    justify-content: flex-start !important;
  }
  /* 文字容器撑开填满 Hero（flex:1），文字自然在上方 */
  .sky > .container {
    flex: 1 1 auto !important;
    z-index: 2;
    padding: 0 18px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 20px;
    padding-bottom: 320px;
    width: 100%;
  }
  .scroll-hint { position: absolute; bottom: 12px; }
  .h1 { font-size: clamp(32px, 9vw, 44px) !important; line-height: 1.15 !important; }
  /* Hero 描述：更小字号 + 强制 max-width（覆盖 inline 560px） */
  .hero-grid p.lead--light { font-size: 13.5px !important; line-height: 1.65 !important; max-width: 100% !important; word-break: break-word; }
  /* eyebrow 在手机端进一步缩小字号 */
  .eyebrow { font-size: 10px !important; letter-spacing: 0.16em !important; }
  .eyebrow img { height: 16px !important; }
  .eyebrow { font-size: 10.5px !important; gap: 7px !important; flex-wrap: wrap; letter-spacing: 0.18em !important; }
  .eyebrow span { white-space: nowrap; }
  .hero-grid { gap: 20px !important; }
  .btn { padding: 13px 22px; font-size: 14px; }
  /* 按钮在手机端纵向排列 + 全宽 */
  .hero-grid > div:first-child > div:last-of-type { flex-direction: column; align-items: stretch; }
  .hero-grid > div:first-child > div:last-of-type .btn { width: 100%; }
  /* 全局 mobile 优化 */
  body { overflow-x: hidden; }
  .h2 { font-size: clamp(26px, 7vw, 36px) !important; }
  .h3 { font-size: clamp(20px, 5vw, 26px) !important; }
  .lead { font-size: 14.5px !important; line-height: 1.7 !important; }
  /* 五大方向卡 + 其他卡片：避免溢出 */
  .track-card, .course-card, .value-card { padding: 22px !important; }
  /* 课程卡 / 活动卡 等：缩窄 padding */
  .section { padding: 64px 0 !important; }
}

/* 富文本内嵌视频（B站 / 腾讯视频 / 优酷外链，或 mp4 直链） */
.video-embed { position: relative; margin: 16px 0; width: 100%; max-width: 100%; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #000; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-embed.is-file { aspect-ratio: auto; }
.video-embed video { display: block; width: 100%; max-height: 70vh; background: #000; }
.md iframe { max-width: 100%; }