/* AIGC云南人工智能产业赛事平台 - 大气科技风 */
:root {
  --blue-deep: #0F3460;
  --blue-dark: #16213E;
  --blue-mid: #1A5276;
  --gold: #D4AF37;
  --gold-light: #F0D67C;
  --text: #1E293B;
  --text-light: #64748B;
  --bg: #F8FAFC;
  --white: #FFFFFF;
  --radius: 12px;
  --shadow: 0 8px 30px rgba(15, 52, 96, .10);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.container { width: min(1200px, 92%); margin: 0 auto; }

/* ===== 导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: linear-gradient(90deg, var(--blue-dark), var(--blue-deep));
  box-shadow: 0 2px 12px rgba(0,0,0,.25);
}
.nav { display: flex; align-items: center; height: 68px; gap: 8px; }
.brand { display: flex; align-items: center; gap: 10px; margin-right: 24px; }
.brand .logo {
  width: 40px; height: 40px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, var(--gold), #b8912a);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 18px;
  box-shadow: 0 0 14px rgba(212,175,55,.55);
}
.brand b { color: #fff; font-size: 17px; letter-spacing: 1px; }
.brand small { display: block; color: var(--gold-light); font-size: 11px; letter-spacing: 2px; font-weight: 400; }
.nav-links { display: flex; gap: 2px; flex: 1; flex-wrap: wrap; }
.nav-links a {
  color: rgba(255,255,255,.85); padding: 8px 13px; border-radius: 8px; font-size: 14.5px;
  transition: all .2s;
}
.nav-links a:hover, .nav-links a.active { color: #fff; background: rgba(255,255,255,.12); }
.nav-links a.active { color: var(--gold-light); }
.nav-cta {
  background: linear-gradient(135deg, var(--gold), #c39c2b); color: #1a1a1a !important;
  font-weight: 700; padding: 9px 22px !important; border-radius: 999px !important;
  box-shadow: 0 0 16px rgba(212,175,55,.5);
}
@media (max-width: 900px) {
  .nav { height: auto; flex-wrap: wrap; padding: 10px 0; }
  .nav-links { order: 3; width: 100%; }
}

/* ===== 首屏 Hero ===== */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(26,82,118,.9), transparent),
    radial-gradient(800px 400px at 10% 110%, rgba(212,175,55,.22), transparent),
    linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-deep) 55%, var(--blue-mid) 100%);
  padding: 96px 0 110px;
}
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .65; }
.hero-inner { position: relative; text-align: center; }
.hero .tag {
  display: inline-block; border: 1px solid rgba(212,175,55,.6); color: var(--gold-light);
  padding: 5px 18px; border-radius: 999px; font-size: 13px; letter-spacing: 3px; margin-bottom: 26px;
}
.hero h1 {
  font-size: clamp(30px, 5vw, 54px); line-height: 1.25; letter-spacing: 2px; font-weight: 800;
  background: linear-gradient(180deg, #fff 20%, #f5e3a8 60%, var(--gold));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  text-shadow: 0 6px 30px rgba(212,175,55,.25);
  filter: drop-shadow(0 3px 6px rgba(0,0,0,.4));
}
.hero p.sub { margin: 20px auto 0; max-width: 760px; color: rgba(255,255,255,.85); font-size: 16.5px; }
.hero .btns { margin-top: 38px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 34px; border-radius: 999px; font-size: 16px; font-weight: 600;
  cursor: pointer; border: none; transition: all .25s;
}
.btn-gold {
  background: linear-gradient(135deg, var(--gold), #c39c2b); color: #14213d;
  box-shadow: 0 6px 22px rgba(212,175,55,.45);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(212,175,55,.6); }
.btn-ghost { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.2); }
.btn-blue { background: var(--blue-deep); color: #fff; }
.btn-blue:hover { background: var(--blue-mid); }
.btn-sm { padding: 7px 16px; font-size: 13.5px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* 首页悬浮报名按钮 */
.float-signup {
  position: fixed; right: 26px; bottom: 34px; z-index: 99;
  background: linear-gradient(135deg, var(--gold), #c39c2b); color: #14213d;
  padding: 15px 28px; border-radius: 999px; font-weight: 700; font-size: 16px;
  box-shadow: 0 8px 26px rgba(212,175,55,.55); transition: transform .2s;
}
.float-signup:hover { transform: scale(1.06); }

/* ===== 区块 ===== */
.section { padding: 72px 0; }
.section.alt { background: #eef3f9; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head .eyebrow { color: var(--gold); letter-spacing: 4px; font-size: 13px; font-weight: 600; }
.section-head h2 { font-size: 32px; color: var(--blue-deep); margin-top: 8px; position: relative; display: inline-block; padding-bottom: 14px; }
.section-head h2::after {
  content: ""; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 56px; height: 3px; border-radius: 3px;
  background: linear-gradient(90deg, var(--gold), var(--blue-mid));
}
.section-head p { color: var(--text-light); margin-top: 12px; }

/* 数据条 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius); padding: 26px 10px; text-align: center; color: #fff;
}
.stat b { font-size: 34px; color: var(--gold-light); display: block; }
.stat span { font-size: 13.5px; color: rgba(255,255,255,.75); }

/* 赛道卡片 */
.tracks { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.track-card {
  position: relative; border-radius: 16px; padding: 34px 24px; color: #fff; overflow: hidden;
  background: linear-gradient(160deg, var(--blue-deep), var(--blue-mid));
  transition: all .3s; min-height: 250px; display: flex; flex-direction: column;
}
.track-card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(300px 160px at 100% 0%, rgba(212,175,55,.28), transparent);
  opacity: 0; transition: opacity .3s;
}
.track-card:hover { transform: translateY(-8px); box-shadow: 0 18px 40px rgba(15,52,96,.35); }
.track-card:hover::before { opacity: 1; }
.track-card .icon { font-size: 40px; margin-bottom: 14px; filter: drop-shadow(0 0 10px rgba(212,175,55,.5)); }
.track-card h3 { font-size: 19px; margin-bottom: 10px; position: relative; }
.track-card h3 em { color: var(--gold-light); font-style: normal; }
.track-card p { font-size: 13.5px; color: rgba(255,255,255,.8); position: relative; flex: 1; }
.track-card .spec { margin-top: 14px; font-size: 12px; color: var(--gold-light); position: relative; }

/* 通用卡片 */
.cards { display: grid; gap: 22px; }
.cards.c3 { grid-template-columns: repeat(3, 1fr); }
.cards.c2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--white); border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow); transition: transform .25s;
}
.card:hover { transform: translateY(-4px); }
.card h3 { color: var(--blue-deep); font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--text-light); font-size: 14.5px; }
.card .gold { color: var(--gold); font-weight: 700; }

/* 时间线 */
.timeline { position: relative; max-width: 820px; margin: 0 auto; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 9px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--gold), var(--blue-mid)); }
.tl-item { position: relative; padding: 0 0 30px 22px; }
.tl-item::before {
  content: ""; position: absolute; left: -30px; top: 7px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--gold); box-shadow: 0 0 0 4px rgba(212,175,55,.25);
}
.tl-item b { color: var(--blue-deep); }
.tl-item .date { color: var(--gold); font-size: 13px; font-weight: 700; margin-right: 10px; }
.tl-item p { color: var(--text-light); font-size: 14px; }

/* ===== 瀑布流展播 ===== */
.filter-bar {
  position: sticky; top: 80px; z-index: 20; background: rgba(255,255,255,.94); backdrop-filter: blur(8px);
  border-radius: 12px; padding: 14px 18px; box-shadow: var(--shadow);
  display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
}
.filter-bar select, .filter-bar input {
  padding: 9px 12px; border: 1px solid #d7e0ec; border-radius: 8px; font-size: 14px; background: #fff; color: var(--text);
}
.masonry { columns: 4 260px; column-gap: 20px; margin-top: 28px; }
.masonry .work-card {
  break-inside: avoid; margin-bottom: 20px; background: #fff; border-radius: 14px; overflow: hidden;
  box-shadow: var(--shadow); transition: all .3s; cursor: pointer;
}
.masonry .work-card:hover { transform: translateY(-5px) scale(1.015); box-shadow: 0 16px 40px rgba(15,52,96,.22); }
.work-card .thumb { width: 100%; min-height: 160px; object-fit: cover; display: block; background: linear-gradient(135deg, var(--blue-deep), var(--blue-mid)); color: #fff; }
.work-card .thumb.ph { height: 180px; display: flex; align-items: center; justify-content: center; font-size: 44px; }
.work-card .meta { padding: 14px 16px; }
.work-card .meta b { font-size: 15px; color: var(--blue-deep); display: block; }
.work-card .meta .by { font-size: 12.5px; color: var(--text-light); margin-top: 4px; }
.badge {
  display: inline-block; font-size: 11.5px; padding: 2.5px 10px; border-radius: 999px; margin-right: 6px; font-weight: 600;
}
.badge.gold { background: linear-gradient(135deg, var(--gold), #e8cd7a); color: #14213d; }
.badge.blue { background: #e3edf9; color: var(--blue-deep); }
.badge.tv { background: #fdeeee; color: #c0392b; border: 1px solid #f2c4c0; }
.level-badge-入展 { background: linear-gradient(135deg,#d4af37,#f0d67c); color:#14213d; }
.level-badge-入围 { background: #e3edf9; color:#0F3460; }
.level-badge-入选 { background: #e8f5ee; color:#1e7a46; }

/* ===== 表单 ===== */
.form-page { max-width: 720px; margin: 40px auto; }
.stepper { display: flex; justify-content: space-between; margin-bottom: 34px; }
.step { flex: 1; text-align: center; position: relative; color: var(--text-light); font-size: 13px; }
.step::before {
  content: ""; position: absolute; top: 16px; left: -50%; width: 100%; height: 2px; background: #d7e0ec; z-index: 0;
}
.step:first-child::before { display: none; }
.step .dot {
  width: 34px; height: 34px; border-radius: 50%; background: #fff; border: 2px solid #d7e0ec;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 8px; position: relative; z-index: 1; font-weight: 700;
}
.step.on { color: var(--blue-deep); font-weight: 700; }
.step.on .dot { border-color: var(--gold); background: linear-gradient(135deg, var(--gold), #e8cd7a); color: #14213d; }
.form-card { background: #fff; border-radius: 16px; padding: 36px; box-shadow: var(--shadow); }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 14px; font-weight: 600; color: var(--blue-deep); margin-bottom: 7px; }
.field label .req { color: #d64541; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid #d7e0ec; border-radius: 10px; font-size: 15px;
  transition: border .2s; background: #fbfdff; color: var(--text); font-family: inherit;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue-mid); box-shadow: 0 0 0 3px rgba(26,82,118,.12); }
.field .hint { font-size: 12.5px; color: var(--text-light); margin-top: 5px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.check-row { display: flex; gap: 18px; flex-wrap: wrap; }
.check-row label { display: flex; align-items: center; gap: 7px; font-weight: 400; font-size: 14.5px; cursor: pointer; color: var(--text); }
.notice {
  background: #fff8e6; border: 1px solid #f0dca0; border-left: 4px solid var(--gold);
  border-radius: 10px; padding: 14px 18px; font-size: 14px; color: #7a5d0d; margin-bottom: 22px;
}
.notice.red { background: #fdf1f0; border-color: #f2c4c0; border-left-color: #d64541; color: #8c2f2b; }
.status-pill { display: inline-block; padding: 3px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.st-待审核 { background: #fff4dd; color: #a06a00; }
.st-已通过 { background: #e5f5ec; color: #1e7a46; }
.st-已驳回 { background: #fdecec; color: #c0392b; }

/* ===== 详情/内容页 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-deep) 60%, var(--blue-mid));
  color: #fff; padding: 58px 0; text-align: center;
}
.page-hero h1 { font-size: 34px; letter-spacing: 2px; }
.page-hero h1 em { color: var(--gold-light); font-style: normal; }
.page-hero p { color: rgba(255,255,255,.8); margin-top: 10px; }
.content-wrap { background: #fff; border-radius: 16px; box-shadow: var(--shadow); padding: 44px; margin: -34px auto 70px; position: relative; }
.content-wrap h2 { color: var(--blue-deep); font-size: 21px; margin: 28px 0 12px; border-left: 4px solid var(--gold); padding-left: 12px; }
.content-wrap h2:first-child { margin-top: 0; }
.content-wrap p, .content-wrap li { color: #3d4c63; font-size: 15px; }
.content-wrap ul { padding-left: 22px; }
.table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px; }
.table th, .table td { border: 1px solid #e2e9f2; padding: 11px 14px; text-align: left; }
.table th { background: #f0f5fb; color: var(--blue-deep); white-space: nowrap; }
.table tr:nth-child(even) td { background: #fafcfe; }

/* 弹窗 */
.modal-mask {
  position: fixed; inset: 0; background: rgba(10,20,40,.62); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal { background: #fff; border-radius: 16px; max-width: 680px; width: 100%; max-height: 86vh; overflow: auto; padding: 30px; position: relative; }
.modal h3 { color: var(--blue-deep); margin-bottom: 14px; }
.modal .close {
  position: absolute; right: 16px; top: 12px; font-size: 26px; color: #94a3b8; cursor: pointer; line-height: 1;
}
.modal .close:hover { color: #475569; }

/* 页脚 */
.site-footer { background: var(--blue-dark); color: rgba(255,255,255,.72); padding: 48px 0 26px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 34px; }
.site-footer h4 { color: #fff; margin-bottom: 14px; font-size: 15.5px; }
.site-footer a { display: block; font-size: 13.5px; padding: 3.5px 0; color: rgba(255,255,255,.65); }
.site-footer a:hover { color: var(--gold-light); }
.copyright { text-align: center; margin-top: 36px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12.5px; color: rgba(255,255,255,.45); }

.toast {
  position: fixed; top: 84px; left: 50%; transform: translateX(-50%) translateY(-16px); z-index: 300;
  background: #14213d; color: #fff; padding: 12px 26px; border-radius: 10px; font-size: 14.5px;
  box-shadow: 0 10px 30px rgba(0,0,0,.3); opacity: 0; pointer-events: none; transition: all .3s; max-width: 86%;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: #a93226; }

@media (max-width: 900px) {
  .tracks, .stats, .cards.c3, .cards.c2, .grid2 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .masonry { columns: 2 200px; }
  .content-wrap { padding: 26px 20px; }
}
@media (max-width: 560px) {
  .tracks, .stats, .cards.c3, .cards.c2, .grid2 { grid-template-columns: 1fr; }
  .filter-bar { position: static; }
}