/* =========================================================
   丰川树海 · 原创世界观构筑大赛 2026
   Visual language: dark industrial / deep-sea blue
   ========================================================= */

/* ---------- 1. Tokens ---------- */
:root{
  --bg:            #04070B;
  --bg-2:          #070C13;
  --bg-3:          #0A111A;
  --panel:         rgba(10,17,26,.72);
  --panel-solid:   #0B131D;

  --line:          rgba(120,175,230,.13);
  --line-2:        rgba(120,180,235,.26);
  --line-3:        rgba(140,200,255,.45);

  --text:          #E7F1FB;
  --text-2:        #A6BACF;
  --text-3:        #6B8098;
  --text-4:        #47596D;

  --blue:          #1FA2FF;
  --blue-lt:       #6FD0FF;
  --blue-dk:       #0A5AA6;
  --cyan:          #55E6FF;
  --red:           #FF3D5E;
  --gold:          #FFC24B;

  --grad-blue:     linear-gradient(122deg,#0A62B4 0%,#1FA2FF 52%,#63D8FF 100%);
  --grad-panel:    linear-gradient(180deg,rgba(16,26,38,.92),rgba(8,13,20,.94));

  --r:             3px;
  --r-lg:          4px;

  --wrap:          1280px;
  --header-h:      72px;

  --font-cn: "PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-num: "Barlow Condensed","Oswald","Arial Narrow",Impact,sans-serif;
  --font-mono:"JetBrains Mono","Cascadia Mono",Consolas,"SFMono-Regular",monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
h1,h2,h3,h4{ margin:0; line-height:1.15; font-weight:800; letter-spacing:-.01em; }
p{ margin:0; }
a{ color:inherit; text-decoration:none; }
ul,ol{ margin:0; padding:0; list-style:none; }
button{ font:inherit; color:inherit; background:none; border:0; cursor:pointer; }
input{ font:inherit; }
.sprite{ position:absolute; width:0; height:0; overflow:hidden; }
.ico{ width:1em; height:1em; flex:none; display:block; }

::selection{ background:rgba(31,162,255,.35); color:#fff; }

/* scrollbar */
::-webkit-scrollbar{ width:10px; height:10px; }
::-webkit-scrollbar-track{ background:#05080D; }
::-webkit-scrollbar-thumb{ background:#16283A; border:2px solid #05080D; border-radius:6px; }
::-webkit-scrollbar-thumb:hover{ background:#1F3B57; }

/* ---------- 3. Background layers ---------- */
.bg{
  position:fixed; inset:0; z-index:0; pointer-events:none; overflow:hidden;
  background:#04070B url("../assets/bg-fallback.jpg") center/cover no-repeat;
}

/* 视频背景层：铺满视口，保持画面主体（人物位于画面中央） */
.bg-video{
  position:absolute; inset:0;
  width:100%; height:100%;
  object-fit:cover;
  object-position:50% 44%;
  opacity:0;                                  /* 就绪后由 .is-ready 淡入 */
  transition:opacity 1.1s var(--ease);
  filter:saturate(.92) contrast(1.05) brightness(.95);
}
.bg-video.is-ready{ opacity:.70; }

/* 可读性遮罩：左侧与上下压暗以承载文字，右侧中部保留画面透气 */
.bg-scrim{
  position:absolute; inset:0;
  background:
    linear-gradient(100deg,
      rgba(4,8,13,.94) 0%,
      rgba(4,8,13,.78) 30%,
      rgba(4,8,13,.38) 58%,
      rgba(4,8,13,.60) 100%),
    linear-gradient(180deg,
      rgba(4,8,13,.86) 0%,
      rgba(4,8,13,.26) 26%,
      rgba(4,8,13,.44) 68%,
      rgba(4,8,13,.96) 100%);
}

.bg-gradient{
  position:absolute; inset:0;
  background:
    radial-gradient(120% 80% at 78% 8%,  rgba(31,162,255,.18) 0%, rgba(31,162,255,0) 55%),
    radial-gradient(90% 70% at 8% 92%,   rgba(11,90,166,.22) 0%, rgba(11,90,166,0) 60%);
}
.bg-grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(120,180,235,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,180,235,.055) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(120% 90% at 50% 30%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(120% 90% at 50% 30%,#000 20%,transparent 78%);
}
.bg-glow{ position:absolute; border-radius:50%; filter:blur(90px); }
.bg-glow.g1{ width:52vw; height:52vw; right:-8vw; top:-14vw; background:rgba(31,162,255,.16); }
.bg-glow.g2{ width:44vw; height:44vw; left:-14vw; bottom:-16vw; background:rgba(10,90,166,.18); }
.bg-noise{
  position:absolute; inset:0; opacity:.30; mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='180' height='180' filter='url(%23n)' opacity='.5'/></svg>");
}
.bg-vignette{
  position:absolute; inset:0;
  background:radial-gradient(130% 100% at 50% 45%, transparent 40%, rgba(0,0,0,.62) 100%);
}

/* ---------- 4. Layout helpers ---------- */
main, .site-header, .site-footer{ position:relative; z-index:1; }
.wrap{ width:min(var(--wrap),calc(100% - 64px)); margin-inline:auto; }
.wrap-narrow{ max-width:900px; }

.section{ padding:120px 0; position:relative; }
.section-alt{ background:linear-gradient(180deg,rgba(9,15,23,.72),rgba(6,10,16,.72)); border-block:1px solid var(--line); }

.section-head{ margin-bottom:56px; }
.section-kicker{
  font-family:var(--font-num); font-size:15px; letter-spacing:.34em;
  color:var(--blue); text-transform:uppercase; margin-bottom:14px;
  display:flex; align-items:center; gap:14px;
}
.section-kicker::before{ content:""; width:34px; height:1px; background:var(--blue); opacity:.8; }
.section-title{
  font-size:clamp(30px,4vw,46px); font-weight:800; letter-spacing:.02em;
  position:relative; padding-left:20px;
}
.section-title::before{
  content:""; position:absolute; left:0; top:.14em; bottom:.14em; width:4px;
  background:var(--grad-blue); border-radius:1px;
}
.section-desc{ margin-top:18px; color:var(--text-2); max-width:640px; font-size:15.5px; }

/* ---------- 5. Buttons ---------- */
.btn{
  --btn-bg:transparent;
  position:relative; display:inline-flex; align-items:center; justify-content:center; gap:10px;
  padding:14px 30px; border-radius:var(--r); font-size:15px; font-weight:700;
  letter-spacing:.06em; white-space:nowrap; isolation:isolate;
  transition:transform .25s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease);
}
.btn .ico{ width:17px; height:17px; }
.btn:active{ transform:translateY(1px); }

.btn-primary{
  background:var(--grad-blue); color:#02121F;
  box-shadow:0 10px 30px -12px rgba(31,162,255,.85), inset 0 1px 0 rgba(255,255,255,.45);
}
.btn-primary::after{
  content:""; position:absolute; inset:0; border-radius:inherit; z-index:-1;
  background:linear-gradient(122deg,#63D8FF,#1FA2FF 60%,#0A62B4);
  opacity:0; transition:opacity .3s var(--ease);
}
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 18px 40px -14px rgba(63,190,255,.95), inset 0 1px 0 rgba(255,255,255,.5); }
.btn-primary:hover::after{ opacity:1; }

.btn-ghost{
  border:1px solid var(--line-2); color:var(--text); background:rgba(255,255,255,.02);
  backdrop-filter:blur(6px);
}
.btn-ghost:hover{ border-color:var(--line-3); background:rgba(31,162,255,.12); transform:translateY(-2px); }

.btn-sm{ padding:10px 20px; font-size:13.5px; }
.btn-lg{ padding:17px 38px; font-size:16px; }

/* ---------- 6. Header ---------- */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:60;
  transition:background .35s var(--ease), backdrop-filter .35s var(--ease);
}
.site-header.is-stuck{
  background:rgba(4,8,13,.82);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
}
.header-inner{
  width:min(var(--wrap),calc(100% - 64px)); margin-inline:auto;
  height:var(--header-h); display:flex; align-items:center; gap:clamp(18px,2.2vw,32px);
}
.brand{ display:flex; align-items:center; gap:12px; flex:none; }
.brand-logo{
  height:30px; width:auto;
  filter:drop-shadow(0 0 12px rgba(31,162,255,.55));
  transition:filter .3s var(--ease);
}
.brand:hover .brand-logo{ filter:drop-shadow(0 0 18px rgba(111,208,255,.9)); }
.brand-tag{
  font-family:var(--font-num); font-size:12px; letter-spacing:.16em;
  padding:3px 8px; border:1px solid var(--line-2); border-radius:2px;
  color:var(--blue-lt); background:rgba(31,162,255,.08);
}
.main-nav{ display:flex; align-items:center; gap:clamp(1px,.3vw,4px); margin-left:clamp(4px,.8vw,12px); flex:1; min-width:0; }
.main-nav a{
  position:relative; padding:9px clamp(9px,.85vw,16px); font-size:clamp(12.8px,.97vw,14.5px); font-weight:600;
  color:var(--text-2); border-radius:var(--r); white-space:nowrap;
  transition:color .25s var(--ease), background .25s var(--ease);
}
.main-nav a::after{
  content:""; position:absolute; left:clamp(9px,.85vw,16px); right:clamp(9px,.85vw,16px); bottom:2px; height:2px;
  background:var(--grad-blue); border-radius:2px; transform:scaleX(0); transform-origin:left;
  transition:transform .32s var(--ease);
}
.main-nav a:hover{ color:var(--text); background:rgba(255,255,255,.04); }
.main-nav a:hover::after,.main-nav a.is-active::after{ transform:scaleX(1); }
.main-nav a.is-active{ color:#fff; }

.header-right{ display:flex; align-items:center; gap:16px; flex:none; }
.lang{
  width:32px; height:32px; display:grid; place-items:center; font-size:12.5px;
  border:1px solid var(--line-2); border-radius:50%; color:var(--text-2);
  font-family:var(--font-num); letter-spacing:.05em; flex:none;
  transition:border-color .25s var(--ease), color .25s var(--ease), background .25s var(--ease), box-shadow .25s var(--ease);
}
.lang:hover{ border-color:var(--line-3); color:#fff; background:rgba(31,162,255,.14); }
.lang.is-open{ border-color:var(--blue); color:#fff; background:rgba(31,162,255,.2); box-shadow:0 0 0 4px rgba(31,162,255,.14); }

/* ---------- 6b. 语言选择弹窗 ---------- */
.lang-modal{ position:fixed; inset:0; z-index:120; display:grid; place-items:center; padding:24px; }
.lang-modal[hidden]{ display:none; }
.lm-backdrop{ position:absolute; inset:0; background:rgba(2,5,9,.76); backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px); animation:lmFade .28s var(--ease) both; }
.lm-panel{
  position:relative; width:min(460px,100%); padding:30px 30px 24px;
  border:1px solid var(--line-2); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,22,33,.98),rgba(7,12,18,.99));
  box-shadow:0 40px 90px -30px rgba(0,0,0,.95), inset 0 1px 0 rgba(255,255,255,.06);
  animation:lmIn .34s var(--ease) both;
}
@keyframes lmFade{ from{ opacity:0; } to{ opacity:1; } }
@keyframes lmIn{ from{ opacity:0; transform:translateY(14px) scale(.98); } to{ opacity:1; transform:none; } }
.lm-head{ position:relative; margin-bottom:22px; }
.lm-kicker{ font-family:var(--font-num); font-size:12px; letter-spacing:.28em; color:var(--blue); margin-bottom:9px; }
.lm-title{ font-size:22px; font-weight:800; letter-spacing:.02em; }
.lm-close{
  position:absolute; top:-6px; right:-8px; width:34px; height:34px;
  display:grid; place-items:center; font-size:20px; line-height:1; color:var(--text-3);
  border-radius:50%; transition:color .25s var(--ease), background .25s var(--ease);
}
.lm-close:hover{ color:#fff; background:rgba(255,255,255,.07); }
.lm-list{ display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.lm-item{
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding:15px 16px; text-align:left;
  border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.9),rgba(8,13,20,.92));
  transition:transform .28s var(--ease), border-color .28s var(--ease), background .28s var(--ease);
}
.lm-item:hover{ transform:translateY(-3px); border-color:var(--line-3); background:linear-gradient(180deg,rgba(18,30,44,.95),rgba(9,15,23,.95)); }
.lm-native{ font-size:15.5px; font-weight:700; letter-spacing:.02em; }
.lm-code{ font-family:var(--font-num); font-size:11px; letter-spacing:.14em; color:var(--text-4); }
.lm-item.is-current{ border-color:var(--blue); background:linear-gradient(180deg,rgba(31,162,255,.2),rgba(31,162,255,.06)); }
.lm-item.is-current .lm-code{ color:var(--blue-lt); }
.lm-note{ margin-top:20px; padding-top:18px; border-top:1px solid var(--line); font-size:12.5px; color:var(--text-4); line-height:1.7; }

.header-line{
  height:1px; width:100%;
  background:linear-gradient(90deg,transparent,rgba(120,180,235,.28),transparent);
}
.nav-toggle{ display:none; width:34px; height:34px; flex-direction:column; gap:5px; align-items:center; justify-content:center; }
.nav-toggle span{ width:20px; height:1.6px; background:var(--text); border-radius:2px; transition:transform .3s var(--ease), opacity .3s var(--ease); }
.nav-toggle.is-open span:nth-child(1){ transform:translateY(6.6px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2){ opacity:0; }
.nav-toggle.is-open span:nth-child(3){ transform:translateY(-6.6px) rotate(-45deg); }

/* ---------- 7. Hero ---------- */
.hero{
  position:relative; min-height:100vh;
  display:flex; align-items:center;
  padding:calc(var(--header-h) + 56px) 0 90px;
}
.hero-inner{
  width:min(var(--wrap),calc(100% - 64px)); margin-inline:auto;
  display:grid; grid-template-columns:minmax(0,1fr) 372px; gap:56px; align-items:center;
}
.hero-copy{ min-width:0; }

.hero-eyebrow{
  display:flex; align-items:center; gap:12px; flex-wrap:wrap;
  font-size:13.5px; letter-spacing:.14em; color:var(--text-2); margin-bottom:26px;
}
.hero-eyebrow .pip{
  width:7px; height:7px; border-radius:50%; background:var(--blue);
  box-shadow:0 0 0 4px rgba(31,162,255,.18), 0 0 14px var(--blue);
  animation:pulse 2.6s var(--ease) infinite;
}
.hero-eyebrow .chip{
  font-family:var(--font-num); font-size:12px; letter-spacing:.18em;
  padding:3px 10px; border:1px solid var(--line-2); border-radius:2px; color:var(--blue-lt);
}
@keyframes pulse{ 0%,100%{ opacity:1; transform:scale(1);} 50%{ opacity:.55; transform:scale(.82);} }

.hero-title{ margin-bottom:20px; }
.hero-title img{
  width:clamp(250px,32vw,430px); height:auto;
  filter:drop-shadow(0 0 40px rgba(31,162,255,.42)) drop-shadow(0 4px 22px rgba(0,0,0,.6));
  animation:titleIn 1.1s var(--ease) both;
}
@keyframes titleIn{ from{ opacity:0; transform:translateY(22px) scale(.97); filter:blur(10px);} to{ opacity:1; transform:none;} }

.hero-sub{
  font-size:clamp(19px,2.3vw,27px); font-weight:700; letter-spacing:.03em;
  color:#fff; margin-bottom:26px;
}
.hero-sub .quote-mark{ color:var(--blue-lt); margin-left:10px; font-weight:600; }

.hero-quote{
  display:flex; gap:16px; align-items:flex-start;
  color:var(--text-2); font-size:15.5px; max-width:560px; margin-bottom:40px;
}
.hero-quote .q-line{ flex:none; width:2px; align-self:stretch; background:linear-gradient(180deg,var(--blue),transparent); }

.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom:52px; }

.hero-org{
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
  font-size:12.5px; letter-spacing:.1em; color:var(--text-3);
}
.hero-org .dot{ width:3px; height:3px; border-radius:50%; background:var(--text-4); }
.hero-org .copyright{ font-family:var(--font-num); letter-spacing:.14em; }

/* ---------- 8. Side panel ---------- */
.side-panel{
  background:var(--grad-panel);
  border:1px solid var(--line-2);
  border-radius:var(--r-lg);
  backdrop-filter:blur(20px) saturate(150%);
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  box-shadow:0 30px 70px -30px rgba(0,0,0,.9), inset 0 1px 0 rgba(255,255,255,.06);
  overflow:hidden;
}
.sp-banner{
  display:flex; align-items:center; gap:14px; padding:18px 18px 16px;
  background:linear-gradient(122deg,rgba(31,162,255,.22),rgba(10,90,166,.10));
  border-bottom:1px solid var(--line-2);
}
.sp-banner-mark{
  font-family:var(--font-num); font-size:11px; letter-spacing:.14em; line-height:1;
  padding:9px 10px; border-radius:2px; color:#fff;
  background:linear-gradient(135deg,var(--red),#C4143A);
  box-shadow:0 6px 18px -6px rgba(255,61,94,.8);
  text-align:center;
}
.sp-banner-text{ flex:1; min-width:0; }
.sp-banner-text strong{ display:block; font-size:15.5px; font-weight:800; letter-spacing:.02em; }
.sp-banner-text span{ display:block; font-family:var(--font-num); font-size:12px; letter-spacing:.14em; color:var(--blue-lt); margin-top:2px; }
.sp-banner-chev{ width:18px; height:18px; color:var(--text-3); }

.sp-quick{ display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line); }
.sp-quick a{
  display:flex; align-items:baseline; justify-content:space-between; gap:8px;
  padding:13px 14px; background:rgba(10,17,26,.6);
  transition:background .25s var(--ease);
}
.sp-quick a:hover{ background:rgba(31,162,255,.14); }
.sp-quick em{ font-style:normal; font-size:13.5px; color:var(--text); }
.sp-quick span{ font-family:var(--font-num); font-size:12px; letter-spacing:.08em; color:var(--blue-lt); }

.sp-group{ border-top:1px solid var(--line); }
.sp-head{
  width:100%; display:flex; align-items:center; gap:13px; padding:15px 18px;
  text-align:left; transition:background .25s var(--ease);
}
.sp-head:hover{ background:rgba(255,255,255,.04); }
.sp-head .ico:first-child{ width:19px; height:19px; color:var(--blue-lt); }
.sp-head span{ flex:1; font-size:14.5px; font-weight:700; letter-spacing:.03em; }
.sp-head .chev{ width:16px; height:16px; color:var(--text-3); transition:transform .35s var(--ease); }
.sp-group.open .sp-head .chev{ transform:rotate(180deg); }
.sp-body{ display:grid; grid-template-rows:0fr; transition:grid-template-rows .4s var(--ease); }
.sp-group.open .sp-body{ grid-template-rows:1fr; }
.sp-body-inner{ overflow:hidden; }
.sp-body-inner a{
  display:block; padding:9px 18px 9px 50px; font-size:13.5px; color:var(--text-2);
  position:relative; transition:color .22s var(--ease), background .22s var(--ease);
}
.sp-body-inner a::before{
  content:""; position:absolute; left:30px; top:50%; width:5px; height:1px;
  background:var(--text-4); transition:width .25s var(--ease), background .25s var(--ease);
}
.sp-body-inner a:hover{ color:#fff; background:rgba(31,162,255,.10); }
.sp-body-inner a:hover::before{ width:9px; background:var(--blue); }
.sp-group.open .sp-body-inner a:last-child{ margin-bottom:14px; }

.scroll-hint{
  position:absolute; left:50%; bottom:28px; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:10px;
  font-family:var(--font-num); font-size:10.5px; letter-spacing:.3em; color:var(--text-4);
}
.sh-line{ width:1px; height:44px; background:linear-gradient(180deg,transparent,var(--blue)); animation:shMove 2.2s var(--ease) infinite; }
@keyframes shMove{ 0%{ transform:scaleY(.2); transform-origin:top; opacity:0;} 40%{opacity:1;} 100%{ transform:scaleY(1); transform-origin:top; opacity:0;} }

/* ---------- 9. 赛事说明 · 分章 ---------- */
.part{ margin-top:88px; }
.section-head + .part{ margin-top:0; }
.part-head{
  position:relative; margin-bottom:32px; padding-bottom:18px;
  border-bottom:1px solid var(--line);
}
.part-head::after{
  content:""; position:absolute; left:0; bottom:-1px; width:64px; height:2px;
  background:var(--grad-blue); border-radius:2px;
}
.part-no{
  font-family:var(--font-mono); font-size:11px; letter-spacing:.26em;
  color:var(--blue); margin-bottom:9px;
}
.part-title{
  display:flex; align-items:center; gap:13px;
  font-size:clamp(21px,2.5vw,29px); font-weight:800; letter-spacing:.02em;
}
.part-title::before{
  content:""; flex:none; width:4px; height:.82em;
  background:var(--grad-blue); border-radius:1px;
}
.part-desc{ margin-top:9px; font-size:13.8px; color:var(--text-3); max-width:700px; }
.part-head + .rule-block{ margin-top:0; }

/* ---------- 10. About ---------- */
.about-grid{ display:grid; grid-template-columns:1.35fr .9fr; gap:60px; align-items:start; }
.about-text p{ color:var(--text-2); margin-bottom:20px; }
.about-text .lead{ font-size:17px; color:var(--text); line-height:1.85; }
.about-text strong{ color:var(--blue-lt); font-weight:700; }
.about-list{ margin-top:34px; border-top:1px solid var(--line); }
.about-list li{
  display:flex; gap:20px; padding:15px 0; border-bottom:1px solid var(--line);
  font-size:14.5px; color:var(--text-2);
}
.about-list span{
  flex:none; width:96px; color:var(--blue-lt); font-weight:700; letter-spacing:.06em;
}

.av-frame{
  position:relative; padding:40px 34px;
  background:linear-gradient(180deg,rgba(14,23,34,.85),rgba(8,13,20,.85));
  border:1px solid var(--line-2); border-radius:var(--r-lg);
}
.av-corner{ position:absolute; width:14px; height:14px; border:1.5px solid var(--blue); }
.av-corner.tl{ top:-1px; left:-1px; border-right:0; border-bottom:0; }
.av-corner.tr{ top:-1px; right:-1px; border-left:0; border-bottom:0; }
.av-corner.bl{ bottom:-1px; left:-1px; border-right:0; border-top:0; }
.av-corner.br{ bottom:-1px; right:-1px; border-left:0; border-top:0; }
.av-index{ font-family:var(--font-mono); font-size:11px; letter-spacing:.22em; color:var(--text-4); margin-bottom:26px; }
.av-frame blockquote{
  margin:0; font-size:18px; line-height:2; font-weight:600; color:var(--text);
}
.av-sign{ margin-top:26px; font-size:13px; letter-spacing:.12em; color:var(--text-3); }

/* ---------- 11. Tracks ---------- */
.track-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.track{
  position:relative; padding:30px 26px 24px; overflow:hidden;
  background:linear-gradient(180deg,rgba(13,21,31,.9),rgba(8,13,20,.92));
  border:1px solid var(--line); border-radius:var(--r-lg);
  transition:transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.track::before{
  content:""; position:absolute; inset:0 0 auto 0; height:2px;
  background:var(--grad-blue); transform:scaleX(0); transform-origin:left;
  transition:transform .45s var(--ease);
}
.track:hover{ transform:translateY(-8px); border-color:var(--line-3); box-shadow:0 30px 60px -30px rgba(31,162,255,.55); }
.track:hover::before{ transform:scaleX(1); }
.track-no{
  position:absolute; top:18px; right:20px;
  font-family:var(--font-num); font-size:44px; font-weight:700; line-height:1;
  color:rgba(120,180,235,.13); letter-spacing:.02em;
}
.track-ico{ width:30px; height:30px; color:var(--blue-lt); margin-bottom:28px; }
.track-name{ font-size:22px; font-weight:800; margin-bottom:6px; }
.track-en{ font-family:var(--font-num); font-size:11.5px; letter-spacing:.24em; color:var(--blue); margin-bottom:18px; }
.track-desc{ font-size:14px; color:var(--text-2); line-height:1.8; min-height:76px; }
.track-spec{ margin-top:20px; padding-top:18px; border-top:1px solid var(--line); }
.track-spec li{ display:flex; gap:14px; font-size:13px; color:var(--text-3); padding:4px 0; }
.track-spec span{ flex:none; width:38px; color:var(--text-4); }
.track-foot{
  margin-top:22px; display:flex; align-items:center; justify-content:space-between;
  font-size:12.5px; color:var(--text-3);
}
.track-count b{ color:var(--blue-lt); font-family:var(--font-num); letter-spacing:.06em; }
.track-go{ display:flex; align-items:center; gap:6px; color:var(--blue-lt); font-weight:600; }
.track-go .ico{ width:14px; height:14px; transition:transform .3s var(--ease); }
.track:hover .track-go .ico{ transform:translateX(4px); }

/* ---------- 12. Timeline ---------- */
.timeline{ position:relative; display:grid; grid-template-columns:repeat(5,1fr); gap:0; }
.timeline::before{
  content:""; position:absolute; left:0; right:0; top:46px; height:1px;
  background:linear-gradient(90deg,transparent,var(--line-2) 8%,var(--line-2) 92%,transparent);
}
.tl-item{ position:relative; padding:0 14px; }
.tl-date{ text-align:center; margin-bottom:22px; }
.tl-date b{ display:block; font-family:var(--font-num); font-size:30px; font-weight:700; letter-spacing:.04em; color:#fff; }
.tl-date span{ font-family:var(--font-num); font-size:11.5px; letter-spacing:.2em; color:var(--text-4); }
.tl-node{
  position:relative; z-index:2; width:12px; height:12px; margin:0 auto 24px;
  background:var(--bg); border:2px solid var(--blue); border-radius:50%;
  box-shadow:0 0 0 5px rgba(31,162,255,.10);
}
.tl-node--hot{ background:var(--red); border-color:var(--red); box-shadow:0 0 0 5px rgba(255,61,94,.14); animation:pulse 2.4s var(--ease) infinite; }
.tl-card{
  padding:20px 20px 22px; border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.86),rgba(8,13,20,.9));
  transition:border-color .35s var(--ease), transform .35s var(--ease);
}
.tl-card:hover{ border-color:var(--line-3); transform:translateY(-4px); }
.tl-card.is-hot{ border-color:rgba(255,61,94,.4); }
.tl-card h4{ font-size:16.5px; margin-bottom:10px; display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.tl-badge{
  font-family:var(--font-mono); font-size:10.5px; letter-spacing:.08em; font-weight:400;
  padding:2px 7px; border-radius:2px; color:#FFB9C6; background:rgba(255,61,94,.14);
  border:1px solid rgba(255,61,94,.3);
}
.tl-card p{ font-size:13.5px; color:var(--text-2); line-height:1.75; }

/* ---------- 13. Awards ---------- */
.award-grid{ display:grid; grid-template-columns:1.5fr 1fr 1fr; gap:20px; }
.award{
  padding:32px 28px; border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.9),rgba(8,13,20,.92));
  transition:transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.award:hover{ transform:translateY(-6px); border-color:var(--line-3); box-shadow:0 30px 60px -32px rgba(31,162,255,.5); }
.award--top{
  grid-row:span 2;
  background:
    radial-gradient(120% 90% at 80% 0%,rgba(255,194,75,.16),transparent 60%),
    linear-gradient(180deg,rgba(20,26,34,.95),rgba(9,14,21,.95));
  border-color:rgba(255,194,75,.34);
  display:flex; flex-direction:column;
}
.award--top:hover{ box-shadow:0 30px 70px -30px rgba(255,194,75,.45); }
.award--minor{ background:linear-gradient(180deg,rgba(11,18,27,.9),rgba(7,11,17,.92)); }
.award-rank{ font-family:var(--font-num); font-size:11.5px; letter-spacing:.26em; color:var(--text-4); margin-bottom:16px; }
.award--top .award-rank{ color:var(--gold); }
.award h3{ font-size:22px; font-weight:800; margin-bottom:14px; }
.award--top h3{ font-size:30px; }
.award-money{
  font-family:var(--font-num); font-size:34px; font-weight:700; letter-spacing:.02em;
  color:#fff; margin-bottom:22px;
  background:linear-gradient(180deg,#FFFFFF,#8FD6FF);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.award--top .award-money{
  font-size:52px; margin-bottom:auto;
  background:linear-gradient(180deg,#FFF2D2,#FFC24B);
  -webkit-background-clip:text; background-clip:text;
}
.award ul{ margin-top:24px; border-top:1px solid var(--line); padding-top:18px; }
.award--top ul{ margin-top:28px; }
.award li{ position:relative; padding-left:16px; font-size:13.5px; color:var(--text-2); padding-block:4px; }
.award li::before{ content:""; position:absolute; left:0; top:.85em; width:6px; height:1px; background:var(--blue); }
.award--top li::before{ background:var(--gold); }

/* ---------- 14. 选手 / 解说卡片 ---------- */
.judge-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.judge{
  display:flex; align-items:center; gap:18px; padding:22px 24px;
  border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.82),rgba(8,13,20,.86));
  transition:transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease), box-shadow .35s var(--ease);
}
a.judge{ display:flex; color:inherit; text-decoration:none; }
a.judge:hover{
  transform:translateY(-5px); border-color:var(--line-3);
  background:linear-gradient(180deg,rgba(18,30,44,.9),rgba(9,15,23,.9));
  box-shadow:0 26px 54px -30px rgba(31,162,255,.55);
}
.judge-av{
  flex:none; width:56px; height:56px; display:grid; place-items:center;
  font-size:22px; font-weight:800; color:var(--blue-lt);
  border:1px solid var(--line-2); border-radius:2px;
  background:linear-gradient(135deg,rgba(31,162,255,.18),rgba(31,162,255,.04));
  position:relative;
}
.judge-av::after{ content:""; position:absolute; right:-1px; bottom:-1px; width:12px; height:12px; border-right:1.5px solid var(--blue); border-bottom:1.5px solid var(--blue); z-index:2; }
.judge-av--img{ padding:0; overflow:hidden; background:#0A111A; }
.judge-av--img img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; display:block; }
.judge-info{ min-width:0; }
.judge-info h4{ font-size:17px; margin-bottom:5px; }
.judge-info span{ font-size:13px; color:var(--text-3); letter-spacing:.06em; }
.judge-link{
  display:inline-flex; align-items:center; gap:6px; margin-top:11px;
  font-style:normal; font-size:12.5px; font-weight:700; letter-spacing:.06em;
  color:var(--blue-lt);
}
.judge-link .ico{ width:13px; height:13px; transition:transform .3s var(--ease); }
a.judge:hover .judge-link .ico{ transform:translateX(4px); }

/* ---------- 15. FAQ ---------- */
.faq-list{ border-top:1px solid var(--line); }
.faq{ border-bottom:1px solid var(--line); }
.faq summary{
  display:flex; align-items:center; justify-content:space-between; gap:20px;
  padding:22px 4px; cursor:pointer; list-style:none;
  font-size:16.5px; font-weight:700; letter-spacing:.02em;
  transition:color .25s var(--ease), padding-left .3s var(--ease);
}
.faq summary::-webkit-details-marker{ display:none; }
.faq summary:hover{ color:var(--blue-lt); padding-left:12px; }
.faq summary .ico{ width:18px; height:18px; flex:none; color:var(--text-3); transition:transform .35s var(--ease), color .25s var(--ease); }
.faq[open] summary{ color:var(--blue-lt); }
.faq[open] summary .ico{ transform:rotate(180deg); color:var(--blue); }
.faq-body{ padding:0 4px 24px; color:var(--text-2); font-size:14.5px; line-height:1.9; max-width:780px; }
.faq[open] .faq-body{ animation:faqIn .4s var(--ease) both; }
@keyframes faqIn{ from{ opacity:0; transform:translateY(-8px);} to{ opacity:1; transform:none;} }

/* ---------- 16. Signup ---------- */
.signup{ position:relative; padding:110px 0; overflow:hidden; }
.signup::before{
  content:""; position:absolute; inset:0;
  background:radial-gradient(70% 120% at 50% 0%,rgba(31,162,255,.16),transparent 62%);
}
.signup-inner{
  position:relative; width:min(760px,calc(100% - 64px)); margin-inline:auto; text-align:center;
  padding:64px 48px; border:1px solid var(--line-2); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,22,33,.9),rgba(7,12,18,.94));
  backdrop-filter:blur(12px);
  box-shadow:0 40px 90px -40px rgba(31,162,255,.4);
}
.signup-deco{ position:absolute; inset:0; pointer-events:none; overflow:hidden; }
.sd-ring{
  position:absolute; top:-120px; right:-100px; width:300px; height:300px;
  border:1px solid rgba(31,162,255,.22); border-radius:50%;
}
.sd-ring--2{ top:-60px; right:-40px; width:180px; height:180px; border-color:rgba(31,162,255,.14); }
.signup-kicker{ font-family:var(--font-num); font-size:13px; letter-spacing:.32em; color:var(--blue); margin-bottom:20px; }
.signup-title{ font-size:clamp(26px,3.6vw,40px); margin-bottom:18px; }
.signup-desc{ color:var(--text-2); font-size:15.5px; max-width:520px; margin:0 auto 40px; }
.signup-form{ max-width:520px; margin:0 auto; }
.field{ display:flex; gap:10px; }
.field input{
  flex:1; min-width:0; padding:15px 18px; border-radius:var(--r);
  border:1px solid var(--line-2); background:rgba(4,8,13,.72); color:var(--text);
  font-size:14.5px; outline:none; transition:border-color .28s var(--ease), box-shadow .28s var(--ease);
}
.field input::placeholder{ color:var(--text-4); }
.field input:focus{ border-color:var(--blue); box-shadow:0 0 0 4px rgba(31,162,255,.14); }
.form-msg{ min-height:22px; margin-top:12px; font-size:13px; color:var(--blue-lt); }
.form-msg.is-error{ color:#FF8FA4; }
.form-note{ margin-top:6px; font-size:12.5px; color:var(--text-4); }
.signup-actions{ margin-top:34px; display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
/* 位于正文段落与订阅表单之间的按钮组，需要与下方表单拉开距离 */
.signup-actions--lead{ margin-top:0; margin-bottom:40px; }

/* ---------- 17. Footer ---------- */
.site-footer{ border-top:1px solid var(--line); background:linear-gradient(180deg,rgba(7,11,17,.9),rgba(3,6,10,.98)); }
.footer-bar{
  display:grid; grid-template-columns:repeat(8,1fr);
  border-bottom:1px solid var(--line);
}
.footer-bar a{
  padding:26px 12px; text-align:center; font-size:14.5px; font-weight:600; letter-spacing:.06em;
  color:var(--text-2); border-left:1px solid var(--line);
  transition:background .28s var(--ease), color .28s var(--ease);
}
.footer-bar a:first-child{ border-left:0; }
.footer-bar a:hover{ background:rgba(31,162,255,.12); color:#fff; }

.footer-bottom{
  width:min(var(--wrap),calc(100% - 64px)); margin-inline:auto;
  padding:44px 0 40px;
  display:grid; grid-template-columns:1fr auto; gap:28px 40px; align-items:center;
}
.footer-brand{ display:flex; align-items:center; gap:20px; }
.footer-brand img{ height:34px; width:auto; opacity:.85; filter:drop-shadow(0 0 10px rgba(31,162,255,.4)); }
.footer-org{ font-size:14px; color:var(--text-2); margin-bottom:6px; }
.footer-copy{ font-family:var(--font-num); font-size:11px; letter-spacing:.16em; color:var(--text-4); }
.footer-links{ display:flex; gap:26px; }
.footer-links a{ font-size:13px; color:var(--text-3); transition:color .25s var(--ease); }
.footer-links a:hover{ color:var(--blue-lt); }
.footer-disclaimer{
  grid-column:1 / -1; font-size:12px; color:var(--text-4); letter-spacing:.04em;
  padding-top:24px; border-top:1px solid var(--line);
}

/* ---------- Supplementary rules (补充规则) ---------- */
.rule-block{ margin-top:76px; }
.section-head + .rule-block{ margin-top:0; }
.rule-head{ margin-bottom:26px; }
.rule-head .section-kicker{ margin-bottom:12px; }
.rule-title{
  display:flex; align-items:center; gap:14px;
  font-size:clamp(19px,2.2vw,24px); font-weight:800; letter-spacing:.02em;
}
.rule-title .rb-no{
  flex:none; font-family:var(--font-num); font-size:12.5px; font-weight:700; letter-spacing:.16em;
  padding:4px 10px; border:1px solid rgba(31,162,255,.42); border-radius:2px;
  color:var(--blue-lt); background:rgba(31,162,255,.12);
}
.rule-total{ margin-top:24px; font-size:14.5px; color:var(--text-2); }
.rule-total b{ font-family:var(--font-num); font-size:18px; letter-spacing:.04em; color:var(--blue-lt); }

/* 总分结算公式：复用 av-frame 的边框与四角装饰 */
.formula-box{ max-width:860px; margin-inline:auto; text-align:center; }
.formula-box .av-index{ margin-bottom:22px; }
.formula{
  margin:0; font-family:var(--font-num); font-weight:700; line-height:1.9; letter-spacing:.03em;
  font-size:clamp(16px,2.35vw,26px);
  background:linear-gradient(180deg,#FFFFFF,#8FD6FF);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.formula .op{ -webkit-text-fill-color:var(--blue); }
.formula-note{ margin-top:18px; font-size:12.5px; letter-spacing:.1em; color:var(--text-3); }

/* ---------- 17b. 直播 / 回放 播放器 ---------- */
.media-frame{
  position:relative; max-width:1040px; margin-inline:auto;
  border:1px solid var(--line-2); border-radius:var(--r-lg);
  background:#05080D; overflow:hidden;
  box-shadow:0 40px 90px -40px rgba(0,0,0,.95), inset 0 1px 0 rgba(255,255,255,.05);
}
.media-frame::before{
  content:""; position:absolute; left:0; right:0; top:0; height:2px; z-index:3;
  background:var(--grad-blue);
}
.ratio{ position:relative; width:100%; }
.ratio-16x9{ padding-top:56.25%; }
.ratio iframe{
  position:absolute; inset:0; width:100%; height:100%;
  border:0; display:block; background:#05080D;
}

/* 直播信息条 */
.live-head{
  max-width:1040px; margin:0 auto 22px;
  display:flex; align-items:center; justify-content:space-between; gap:20px; flex-wrap:wrap;
  padding:16px 20px; border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.84),rgba(8,13,20,.88));
}
.live-info{ display:flex; align-items:center; gap:14px; min-width:0; }
.live-dot{
  flex:none; width:8px; height:8px; border-radius:50%; background:var(--red);
  box-shadow:0 0 0 4px rgba(255,61,94,.16), 0 0 12px rgba(255,61,94,.8);
  animation:pulse 2.4s var(--ease) infinite;
}
.live-dot.is-off{ background:var(--text-4); box-shadow:none; animation:none; }
.live-text strong{ display:block; font-size:16px; font-weight:800; letter-spacing:.02em; }
.live-text span{ display:block; font-family:var(--font-num); font-size:12px; letter-spacing:.12em; color:var(--text-3); margin-top:3px; }

/* 直播：载入前封面遮罩（同时是 JS 关闭时的兜底） */
.media-frame--live{ position:relative; }
.live-cover{
  position:absolute; inset:0; z-index:5; overflow:hidden;
  transition:opacity .45s var(--ease), visibility .45s var(--ease);
}
.media-frame--live.is-loaded .live-cover{ opacity:0; visibility:hidden; pointer-events:none; }
.live-cover-img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }
.live-cover-scrim{
  position:absolute; inset:0;
  background:linear-gradient(180deg,rgba(4,8,13,.44) 0%,rgba(4,8,13,.80) 58%,rgba(4,8,13,.94) 100%);
}
.live-cover-body{
  position:relative; z-index:2; height:100%;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  text-align:center; gap:13px; padding:26px;
}
.live-badge{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-num); font-size:11.5px; letter-spacing:.2em;
  padding:4px 11px; border-radius:2px; color:#FFB9C6;
  background:rgba(255,61,94,.16); border:1px solid rgba(255,61,94,.36);
}
.live-badge i{
  width:6px; height:6px; border-radius:50%; background:var(--red);
  box-shadow:0 0 8px rgba(255,61,94,.9); animation:pulse 2.4s var(--ease) infinite;
}
.live-cover-title{ font-size:clamp(19px,2.4vw,28px); font-weight:800; letter-spacing:.02em; }
.live-cover-desc{ font-size:13.5px; color:var(--text-2); letter-spacing:.05em; }
.live-cover-actions{ display:flex; gap:13px; flex-wrap:wrap; justify-content:center; margin-top:9px; }

/* 播放器下方说明行 */
.media-note{
  max-width:1040px; margin:16px auto 0;
  font-size:12.5px; line-height:1.75; color:var(--text-4); letter-spacing:.03em;
}

/* 播放按钮 */
.vcard-play{
  position:absolute; inset:0; z-index:2;
  background:linear-gradient(180deg,rgba(4,8,13,.06),rgba(4,8,13,.62));
}
.vcard-play::before{
  content:""; position:absolute; left:50%; top:50%; width:56px; height:56px;
  border-radius:50%; border:1px solid rgba(140,200,255,.5);
  background:rgba(10,20,30,.55);
  transform:translate(-50%,-50%);
  transition:transform .35s var(--ease), background .35s var(--ease), border-color .35s var(--ease);
}
.vcard-play .ico{
  position:absolute; left:50%; top:50%; width:22px; height:22px; color:#fff;
  transform:translate(-58%,-50%);
}
.vcard:hover .vcard-play::before{
  transform:translate(-50%,-50%) scale(1.1);
  background:rgba(31,162,255,.34); border-color:rgba(140,200,255,.9);
}

/* 回放主视频说明 */
.media-caption{
  max-width:1040px; margin:20px auto 0;
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
}
.media-caption .mc-tag{
  flex:none; font-family:var(--font-num); font-size:11px; letter-spacing:.16em;
  padding:3px 9px; border-radius:2px; color:#FFB9C6;
  background:rgba(255,61,94,.14); border:1px solid rgba(255,61,94,.3);
}
.media-caption h3{ font-size:17px; font-weight:800; }
.media-caption p{ width:100%; font-size:13px; color:var(--text-3); line-height:1.7; }
.media-caption p b{ color:var(--text-2); }

/* 回放附加视频卡 */
.replay-subs{
  max-width:1040px; margin:34px auto 0;
  display:grid; grid-template-columns:1fr 1fr; gap:22px;
}
.vcard{
  display:flex; flex-direction:column; overflow:hidden;
  border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.9),rgba(8,13,20,.92));
  transition:transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.vcard:hover{ transform:translateY(-6px); border-color:var(--line-3); box-shadow:0 30px 60px -32px rgba(31,162,255,.5); }
.vcard-cover{ position:relative; aspect-ratio:16/9; overflow:hidden; background:#05080D; }
.vcard-cover img{ width:100%; height:100%; object-fit:cover; transition:transform .7s var(--ease); }
.vcard:hover .vcard-cover img{ transform:scale(1.06); }
.vcard-dur{
  position:absolute; right:10px; bottom:10px; z-index:2;
  font-family:var(--font-num); font-size:12px; letter-spacing:.08em;
  padding:2px 8px; border-radius:2px; color:var(--text);
  background:rgba(4,8,13,.82); border:1px solid rgba(120,180,235,.24);
}
.vcard-body{ display:flex; flex-direction:column; flex:1; padding:18px 20px 20px; }
.vcard-title{ font-size:16.5px; font-weight:800; line-height:1.5; margin-bottom:14px; }
.vcard-meta{ display:flex; align-items:center; gap:14px; flex-wrap:wrap; font-size:12.8px; color:var(--text-3); margin-bottom:16px; }
.vcard-up{ display:inline-flex; align-items:center; gap:6px; color:var(--text-2); }
.vcard-up .ico{ width:14px; height:14px; color:var(--blue-lt); }
.vcard-bv{ font-family:var(--font-mono); font-size:11.5px; letter-spacing:.06em; color:var(--text-4); }
.vcard-go{
  margin-top:auto; display:inline-flex; align-items:center; gap:7px;
  font-size:12.8px; font-weight:700; letter-spacing:.06em; color:var(--blue-lt);
}
.vcard-go .ico{ width:14px; height:14px; transition:transform .3s var(--ease); }
.vcard:hover .vcard-go .ico{ transform:translateX(4px); }

/* ---------- 17c. 积分榜 ---------- */
.rank-board{
  border:1px solid var(--line-2); border-radius:var(--r-lg); overflow:hidden;
  background:linear-gradient(180deg,rgba(12,20,30,.9),rgba(7,12,18,.94));
  box-shadow:0 36px 80px -40px rgba(0,0,0,.9);
}
.rank-scroll{ overflow-x:auto; }
.rank-table{ min-width:860px; }
.rank-row{
  position:relative; display:grid;
  grid-template-columns:74px minmax(0,1.6fr) 92px 112px 104px 104px 116px;
  align-items:center; gap:12px; padding:16px 22px;
  border-top:1px solid var(--line);
}
.rank-row--head{ border-top:0; background:rgba(31,162,255,.07); }
.rank-row--head .rk-pos,
.rank-row--head .rk-name,
.rank-row--head .rk-team,
.rank-row--head .rk-cell{
  font-family:var(--font-num); font-size:12px; letter-spacing:.16em;
  color:var(--text-3); text-transform:uppercase;
}
.rank-row:not(.rank-row--head){ transition:background .25s var(--ease); }
.rank-row:not(.rank-row--head):hover{ background:rgba(255,255,255,.03); }
.rank-row > span{ position:relative; z-index:1; }
.rk-bar{
  position:absolute; left:0; top:0; bottom:0; width:var(--p); z-index:0; pointer-events:none;
  background:linear-gradient(90deg,rgba(31,162,255,.16),rgba(31,162,255,0));
}
.rk-pos b{ font-family:var(--font-num); font-size:20px; font-weight:700; letter-spacing:.04em; color:var(--text-2); }
.rk-name{ display:flex; align-items:center; gap:12px; min-width:0; }
.rk-name img{
  flex:none; width:30px; height:30px; object-fit:cover;
  border:1px solid var(--line-2); border-radius:2px; background:#0A111A;
}
.rk-name em{
  font-style:normal; font-size:15px; font-weight:700; letter-spacing:.02em;
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
.rk-team{ font-family:var(--font-num); font-size:13px; letter-spacing:.1em; color:var(--text-3); }
.rk-cell{ font-family:var(--font-num); font-size:15px; letter-spacing:.04em; color:var(--text-2); }
.rk-total{ font-size:21px; font-weight:700; color:#fff; }

.rank-row--top1{ background:radial-gradient(90% 170% at 5% 50%, rgba(255,194,75,.13), transparent 62%); }
.rank-row--top1 .rk-pos b{ color:var(--gold); }
.rank-row--top1 .rk-name em{ color:#FFE9BE; }
.rank-row--top1 .rk-bar{ background:linear-gradient(90deg,rgba(255,194,75,.22),rgba(255,194,75,0)); }
.rank-row--top1 .rk-total{
  background:linear-gradient(180deg,#FFF2D2,#FFC24B);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.rank-row--top2 .rk-pos b{ color:#CFDDEA; }
.rank-row--top3 .rk-pos b{ color:#DDA173; }

.rank-legend{
  display:flex; align-items:center; gap:22px; flex-wrap:wrap;
  padding:16px 22px; border-top:1px solid var(--line); background:rgba(5,9,14,.6);
  font-size:12.5px; letter-spacing:.06em; color:var(--text-3);
}
.rank-legend span{ display:inline-flex; align-items:center; gap:8px; }
.lg-dot{ width:9px; height:9px; border-radius:2px; }
.lg-dot--gold{ background:linear-gradient(135deg,#FFD982,#E0A32A); }
.lg-dot--silver{ background:linear-gradient(135deg,#E6EFF7,#93A9BC); }
.lg-dot--bronze{ background:linear-gradient(135deg,#E8B98D,#B0713C); }
.rank-legend-note{ margin-left:auto; font-family:var(--font-mono); font-size:11.5px; letter-spacing:.1em; color:var(--text-4); }

/* ---------- 17d. 交流群信息卡（#join） ---------- */
.group-card{
  max-width:660px; margin:0 auto; text-align:left;
  border:1px solid var(--line-2); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,31,.9),rgba(8,13,20,.94));
  box-shadow:0 30px 70px -34px rgba(0,0,0,.9), inset 0 1px 0 rgba(255,255,255,.05);
  overflow:hidden;
}
.gc-head{
  display:flex; align-items:center; gap:16px;
  padding:22px 24px; border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(31,162,255,.10),rgba(31,162,255,0));
}
.gc-avatar{
  flex:none; width:52px; height:52px; display:grid; place-items:center;
  border-radius:var(--r-lg); border:1px solid rgba(31,162,255,.42);
  background:rgba(31,162,255,.14); color:var(--blue-lt); font-size:24px;
  box-shadow:0 0 0 4px rgba(31,162,255,.08);
}
.gc-avatar .ico{ width:24px; height:24px; }
.gc-title{ min-width:0; flex:1; }
.gc-title strong{ display:block; font-size:18px; font-weight:800; letter-spacing:.02em; }
.gc-title span{
  display:block; margin-top:4px; font-size:12.5px; color:var(--text-3);
  font-family:var(--font-num); letter-spacing:.08em;
}
.gc-badge{
  flex:none; font-family:var(--font-num); font-size:12px; letter-spacing:.16em;
  padding:4px 11px; border:1px solid var(--line-2); border-radius:2px;
  color:var(--blue-lt); background:rgba(31,162,255,.1);
}
.gc-stats{ margin:0; padding:8px 24px; }
.gc-stats > div{
  display:grid; grid-template-columns:104px 1fr; gap:16px; align-items:baseline;
  padding:14px 0; border-bottom:1px solid var(--line);
}
.gc-stats > div:last-child{ border-bottom:0; }
.gc-stats dt{ font-size:13px; color:var(--text-3); letter-spacing:.06em; }
.gc-stats dd{ margin:0; font-size:14.5px; color:var(--text); }
.gc-no{ font-family:var(--font-num); font-size:20px; font-weight:700; letter-spacing:.1em; color:var(--blue-lt); }
.gc-actions{
  display:flex; gap:14px; flex-wrap:wrap;
  padding:20px 24px 24px; border-top:1px solid var(--line);
}
.gc-actions .btn{ flex:1 1 auto; }

.group-perks{ max-width:660px; margin:34px auto 0; display:grid; gap:8px; text-align:left; }
.group-perks li{
  position:relative; padding:13px 18px 13px 44px;
  font-size:13.8px; color:var(--text-2);
  border:1px solid var(--line); border-radius:var(--r);
  background:rgba(255,255,255,.015);
}
.group-perks li::before{
  content:""; position:absolute; left:19px; top:50%; width:8px; height:8px;
  transform:translateY(-50%) rotate(45deg);
  background:var(--grad-blue); border-radius:1px;
}
.group-perks li span{
  display:inline-block; min-width:72px; margin-right:10px;
  font-weight:800; color:var(--text); letter-spacing:.04em;
}
.group-note{
  max-width:660px; margin:22px auto 0; text-align:left;
  font-size:12.5px; line-height:1.85; color:var(--text-4);
}

/* ---------- 18b. 报名子页（signup.html） ---------- */
body.page-signup{ background:var(--bg); }
.subpage{ position:relative; z-index:1; padding-top:var(--header-h); }

.page-hero{ padding:96px 0 58px; }
.page-hero-copy{ max-width:780px; }
.page-title{
  font-size:clamp(34px,5vw,58px); font-weight:800; letter-spacing:.02em;
  line-height:1.1; margin-top:6px;
}
.page-desc{ margin-top:20px; max-width:660px; color:var(--text-2); font-size:16px; }
.page-hero-tags{ margin-top:26px; display:flex; flex-wrap:wrap; gap:10px; }
.ph-tag{
  font-family:var(--font-num); font-size:12.5px; letter-spacing:.14em;
  padding:6px 14px; border:1px solid var(--line-2); border-radius:2px;
  color:var(--blue-lt); background:rgba(31,162,255,.08);
}
.header-back{ gap:8px; }
.header-back .ico{ width:15px; height:15px; }

.reg-grid{ display:grid; grid-template-columns:minmax(0,1.55fr) minmax(0,1fr); gap:36px; align-items:start; }
.reg-form{
  padding:38px 40px 34px; border:1px solid var(--line-2); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,22,33,.92),rgba(7,12,18,.95));
  box-shadow:0 40px 90px -40px rgba(0,0,0,.9), inset 0 1px 0 rgba(255,255,255,.05);
}
.reg-form-head{ margin-bottom:30px; }
.reg-title{ font-size:clamp(22px,2.6vw,28px); }
.reg-sub{ margin-top:10px; font-size:13.5px; color:var(--text-3); }
.reg-sub i{ color:var(--blue-lt); font-style:normal; }
.reg-fields{ display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.reg-field{ display:flex; flex-direction:column; gap:9px; }
.reg-field--full{ grid-column:1 / -1; }
.reg-field > span{ font-size:13.5px; font-weight:700; letter-spacing:.05em; color:var(--text-2); }
.reg-field > span i{ color:var(--blue-lt); font-style:normal; }
.reg-field input,.reg-field textarea{
  width:100%; padding:14px 16px; border-radius:var(--r);
  border:1px solid var(--line-2); background:rgba(4,8,13,.72); color:var(--text);
  font-size:14.5px; font-family:inherit; outline:none;
  transition:border-color .28s var(--ease), box-shadow .28s var(--ease), background .28s var(--ease);
}
.reg-field textarea{ resize:vertical; min-height:96px; line-height:1.7; }
.reg-field input::placeholder,.reg-field textarea::placeholder{ color:var(--text-4); }
.reg-field input:focus,.reg-field textarea:focus{
  border-color:var(--blue); background:rgba(4,8,13,.92);
  box-shadow:0 0 0 4px rgba(31,162,255,.14);
}
.reg-field.has-error input,.reg-field.has-error textarea{
  border-color:#FF5E7A; box-shadow:0 0 0 4px rgba(255,61,94,.14);
}
.reg-check{ display:flex; align-items:flex-start; gap:11px; margin-top:26px; font-size:13.5px; color:var(--text-2); cursor:pointer; }
.reg-check input{ flex:none; margin-top:4px; width:17px; height:17px; accent-color:var(--blue); }
.reg-submit{ display:flex; gap:14px; flex-wrap:wrap; margin-top:30px; }
.reg-form .form-msg{ margin-top:16px; min-height:0; }
.reg-form .form-note{ margin-top:16px; padding-top:16px; border-top:1px solid var(--line); line-height:1.75; }

.reg-side{ display:grid; gap:20px; }
.reg-card{
  padding:24px 26px; border:1px solid var(--line); border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(11,19,29,.86),rgba(7,12,18,.9));
}
.reg-card-title{ display:flex; align-items:center; gap:10px; font-size:15.5px; margin-bottom:16px; }
.reg-card-title .ico{ width:18px; height:18px; color:var(--blue); }
.reg-card .about-list{ margin-top:0; }
.reg-card .about-list li{ padding:11px 0; gap:16px; font-size:13.5px; }
.reg-card .about-list span{ width:72px; }
.reg-steps{ display:grid; gap:14px; }
.reg-steps li{ display:flex; gap:12px; align-items:baseline; font-size:13.5px; color:var(--text-2); }
.reg-steps li b{
  flex:none; font-family:var(--font-num); font-size:12px; letter-spacing:.12em;
  padding:3px 8px; border:1px solid rgba(31,162,255,.4); border-radius:2px;
  color:var(--blue-lt); background:rgba(31,162,255,.1);
}
.reg-links{ display:grid; gap:8px; }
.reg-links a{
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding:12px 14px; font-size:13.5px; font-weight:600; color:var(--text-2);
  border:1px solid var(--line); border-radius:var(--r);
  transition:color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
}
.reg-links a:hover{ color:#fff; border-color:var(--line-3); background:rgba(31,162,255,.1); transform:translateX(3px); }
.reg-links a .ico{ width:15px; height:15px; color:var(--blue); }
.reg-card-desc{ font-size:13.5px; color:var(--text-2); margin-bottom:18px; line-height:1.8; }
.reg-card-btn{ width:100%; }
.footer-bottom--simple{ grid-template-columns:1fr auto; }

/* ---------- 18. Reveal ---------- */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.is-in{ opacity:1; transform:none; }

/* ---------- 19. Responsive ---------- */

/* 顶栏：栏目较多，需要提前收紧（语言按钮保持可见，便于随时切换语种） */
@media (max-width:1300px){
  .main-nav{ gap:0; margin-left:6px; }
  .main-nav a{ padding:9px 9px; font-size:13.5px; }
}

/* 折叠为汉堡菜单：栏目在 1200px 以下无法横向排布 */
@media (max-width:1200px){
  .site-header{ background:rgba(4,8,13,.86); backdrop-filter:blur(16px); }
  .main-nav{
    position:fixed; top:var(--header-h); left:0; right:0;
    flex-direction:column; align-items:stretch; gap:0; margin:0;
    background:rgba(5,9,14,.97); border-bottom:1px solid var(--line-2);
    padding:10px 20px 22px;
    clip-path:inset(0 0 100% 0); opacity:0; pointer-events:none;
    transition:clip-path .4s var(--ease), opacity .3s var(--ease);
    max-height:calc(100vh - var(--header-h)); overflow-y:auto;
  }
  .main-nav.is-open{ clip-path:inset(0 0 0 0); opacity:1; pointer-events:auto; }
  .main-nav a{ padding:15px 8px; font-size:15.5px; border-bottom:1px solid var(--line); border-radius:0; white-space:normal; overflow-wrap:break-word; }
  .main-nav a::after{ display:none; }
  .nav-toggle{ display:flex; }
  .header-right .btn-sm{ display:none; }
}

@media (max-width:1180px){
  .hero-inner{ grid-template-columns:1fr; gap:48px; }
  .side-panel{ max-width:520px; }
  .track-grid{ grid-template-columns:repeat(2,1fr); }
  .timeline{ grid-template-columns:repeat(3,1fr); row-gap:44px; }
  .timeline::before{ display:none; }
  .award-grid{ grid-template-columns:1fr 1fr; }
  .award--top{ grid-column:span 2; grid-row:auto; }
  .judge-grid{ grid-template-columns:repeat(2,1fr); }
}

@media (max-width:900px){
  .wrap,.hero-inner,.header-inner,.footer-bottom{ width:calc(100% - 40px); }
  .section{ padding:88px 0; }
  .hero{ padding-top:calc(var(--header-h) + 40px); min-height:auto; padding-bottom:70px; }
  .scroll-hint{ display:none; }
  .about-grid{ grid-template-columns:1fr; gap:40px; }
  .timeline{ grid-template-columns:1fr 1fr; }
  .footer-bar{ grid-template-columns:repeat(4,1fr); }
  .footer-bar a:nth-child(4n+1){ border-left:0; }
  .footer-bar a:nth-child(n+5){ border-top:1px solid var(--line); }
  .footer-bottom{ grid-template-columns:1fr; }
  .footer-brand{ flex-wrap:wrap; }
}

/* 积分榜：窄于 780px 时收起「成就加分 / 招募加分」，只留 排名/选手/出场/基础/总分，避免横向滚动
   主体行首个兄弟是 .rk-bar，表头行没有，因此两者的 nth-child 序号相差 1 */
@media (max-width:780px){
  .rank-table{ min-width:0; }
  .rank-row{ grid-template-columns:52px minmax(0,1.6fr) 64px 96px 104px; }
  .rank-row:not(.rank-row--head) > .rk-cell:nth-child(6),
  .rank-row:not(.rank-row--head) > .rk-cell:nth-child(7),
  .rank-row--head > .rk-cell:nth-child(5),
  .rank-row--head > .rk-cell:nth-child(6){ display:none; }
  .rk-total{ font-size:19px; }
}

@media (max-width:640px){
  body{ font-size:15px; }
  .section{ padding:72px 0; }
  .hero-title img{ width:min(78vw,320px); }
  .hero-actions{ gap:12px; }
  .hero-actions .btn{ flex:1 1 auto; }
  .hero-org{ font-size:11.5px; gap:10px; }
  .side-panel{ max-width:100%; }
  .sp-quick{ grid-template-columns:1fr; }
  .track-grid{ grid-template-columns:1fr; }
  .track-desc{ min-height:0; }
  .timeline{ grid-template-columns:1fr; row-gap:34px; }
  .award-grid{ grid-template-columns:1fr; }
  .award--top{ grid-column:auto; }
  .judge-grid{ grid-template-columns:1fr; }
  .signup-inner{ padding:44px 24px; }
  .field{ flex-direction:column; }
  .footer-bar{ grid-template-columns:1fr 1fr; }
  .footer-bar a:nth-child(2n+1){ border-left:0; }
  .footer-bar a:nth-child(n+3){ border-top:1px solid var(--line); }
  .footer-links{ gap:18px; flex-wrap:wrap; }
  .rule-block{ margin-top:58px; }
  .rule-title{ font-size:18px; gap:10px; }
  .rule-head{ margin-bottom:20px; }
  .formula-box{ padding:32px 22px; }
  .formula{ line-height:1.75; }
  .part{ margin-top:64px; }
  .part-head{ margin-bottom:24px; }
  .live-head{ flex-direction:column; align-items:flex-start; }
  .live-head .btn{ width:100%; }
  .live-cover-actions{ gap:10px; }
  .live-cover-actions .btn{ padding:13px 20px; font-size:14px; }
  .media-caption h3{ font-size:15.5px; }
  .replay-subs{ grid-template-columns:1fr; gap:18px; }
  .rank-row{ gap:8px; padding:14px 16px; }
  .rank-legend{ gap:14px; padding:14px 16px; }
  .rank-legend-note{ margin-left:0; width:100%; }
}

/* 交流群信息卡 / 报名子页：窄屏压缩 */
@media (max-width:1180px){
  .reg-grid{ grid-template-columns:1fr; }
}
@media (max-width:900px){
  .page-hero{ padding:72px 0 44px; }
}
@media (max-width:640px){
  .page-hero{ padding:56px 0 34px; }
  .reg-form{ padding:30px 22px 28px; }
  .reg-fields{ grid-template-columns:1fr; }
  .reg-submit .btn{ width:100%; }
  .gc-stats{ padding:6px 20px; }
  .gc-stats > div{ grid-template-columns:1fr; gap:6px; padding:13px 0; }
  .gc-head{ padding:18px 20px; }
  .gc-actions{ padding:18px 20px 20px; }
  .gc-actions .btn{ width:100%; }
  .group-perks li span{ display:block; min-width:0; margin:0 0 3px; }
  .footer-bottom--simple{ grid-template-columns:1fr; }
}

/* ---------- 20. Motion preference ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{ animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; scroll-behavior:auto !important; }
  .reveal{ opacity:1; transform:none; }
}