/* =============================================================
   集合开黑 · 官网设计系统  main.css
   - 设计令牌 / 基础重置 / 布局 / 组件 / 动效 / 响应式 / 主题
   - 供 index / tools / resources / 404 共用
   ============================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 色板（默认暗色电竞主题） */
  --bg:        #0a0e1a;
  --bg-soft:   #0e1424;
  --surface:   #131c31;
  --surface-2: #1a2440;
  --border:    #24325a;
  --border-soft:#1b2743;

  --text:      #e8eeff;
  --text-2:    #b9c6e4;
  --muted:     #8494b8;

  --accent:    #2fd8f6;   /* 主色：logo 亮青 */
  --accent-2:  #3b78b1;   /* 辅色：logo 中蓝 */
  --accent-ink:#06202e;
  --ok:        #2fd8f6;
  --warn:      #ffb02e;
  --danger:    #ff5a76;

  --glow:      0 0 0 1px rgba(47,216,246,.28), 0 12px 40px -12px rgba(47,216,246,.35);
  --shadow:    0 18px 50px -22px rgba(0,0,0,.85);
  --shadow-sm: 0 8px 24px -14px rgba(0,0,0,.8);

  --r-sm: 8px; --r-md: 14px; --r-lg: 20px; --r-xl: 28px; --r-pill: 999px;
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px;

  --font: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono: "JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;

  --maxw: 1180px;
  --ease: cubic-bezier(.22,.61,.36,1);
  --dur: .28s;
}

/* 亮色主题（data-theme="light"） */
[data-theme="light"] {
  --bg:        #f5f7fc;
  --bg-soft:   #eef2fa;
  --surface:   #ffffff;
  --surface-2: #f3f6fd;
  --border:    #dbe3f2;
  --border-soft:#e7ecf7;

  --text:      #101a33;
  --text-2:    #374764;
  --muted:     #64739a;

  --accent:    #1899c2;
  --accent-2:  #3b78b1;
  --accent-ink:#ffffff;

  --glow:      0 0 0 1px rgba(24,153,194,.3), 0 14px 36px -18px rgba(24,153,194,.5);
  --shadow:    0 18px 44px -24px rgba(20,35,80,.35);
  --shadow-sm: 0 10px 24px -16px rgba(20,35,80,.35);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body.no-scroll { overflow: hidden; }

/* 背景光晕 */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(60vw 40vw at 12% -8%, rgba(108,92,255,.20), transparent 60%),
    radial-gradient(52vw 36vw at 100% 0%, rgba(22,224,184,.16), transparent 62%),
    radial-gradient(70vw 50vw at 50% 120%, rgba(108,92,255,.10), transparent 60%);
}
[data-theme="light"] body::before {
  background:
    radial-gradient(60vw 40vw at 10% -10%, rgba(91,75,255,.10), transparent 60%),
    radial-gradient(52vw 36vw at 100% 0%, rgba(11,184,148,.10), transparent 62%);
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1,h2,h3,h4,h5,p,ul,ol,figure { margin: 0; }
ul,ol { padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: var(--accent); color: var(--accent-ink); }

/* 滚动条 */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius: 99px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--border); }

/* ---------- 3. 布局工具 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--sp-5); }
.section { padding: var(--sp-9) 0; }
.section--tight { padding: var(--sp-7) 0; }
.stack > * + * { margin-top: var(--sp-4); }
.center { text-align: center; }
.sr-only {
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0 0 0 0); white-space:nowrap; border:0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 999;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: var(--r-sm); transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 4. 排版 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before { content:""; width: 26px; height: 2px; background: linear-gradient(90deg,var(--accent),transparent); border-radius: 2px; }
.h1 { font-size: clamp(30px, 5.2vw, 54px); line-height: 1.12; font-weight: 800; letter-spacing: -.01em; }
.h2 { font-size: clamp(24px, 3.4vw, 36px); line-height: 1.2; font-weight: 750; letter-spacing: -.01em; }
.h3 { font-size: clamp(18px, 2.2vw, 22px); font-weight: 700; }
.lead { font-size: clamp(15px, 1.6vw, 18px); color: var(--text-2); max-width: 62ch; }
.muted { color: var(--muted); }
.grad {
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-2) 70%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- 5. 顶栏与导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-header.is-stuck { border-bottom-color: var(--border-soft); background: color-mix(in srgb, var(--bg) 92%, transparent); }
.nav { display: flex; align-items: center; gap: var(--sp-5); height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: .02em; }
.brand .logo-mark {
  width: 36px; height: 36px; border-radius: 11px; flex: 0 0 auto;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  display: grid; place-items: center;
  overflow: hidden;
}
.brand .logo-mark img { width: 27px; height: 27px; object-fit: contain; display: block; }
.brand small { display: block; font-size: 11px; font-weight: 600; color: var(--muted); letter-spacing: .16em; }

.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  position: relative; padding: 9px 14px; border-radius: var(--r-pill);
  color: var(--text-2); font-weight: 600; font-size: 15px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a[aria-current="page"], .nav-links a.is-active { color: var(--text); background: var(--surface-2); }
.nav-links a[aria-current="page"]::after {
  content:""; position: absolute; left: 50%; bottom: 2px; transform: translateX(-50%);
  width: 16px; height: 2px; border-radius: 2px; background: var(--accent);
}
.nav-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  width: 40px; height: 40px; display: grid; place-items: center;
  border: 1px solid var(--border); border-radius: 12px; background: var(--surface);
  cursor: pointer; transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.icon-btn:hover { transform: translateY(-1px); border-color: var(--accent); }
.icon-btn svg { width: 19px; height: 19px; }

.nav-toggle { display: none; }

/* 移动端抽屉 */
@media (max-width: 900px) {
  .nav-links {
    position: fixed; inset: 68px 0 auto 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 6px; margin: 0;
    padding: var(--sp-5); background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%); transition: transform .34s var(--ease);
    box-shadow: var(--shadow);
  }
  .nav-links.is-open { transform: translateY(0); }
  .nav-links a { padding: 14px 16px; font-size: 17px; }
  .nav-toggle { display: grid; }
  .nav-actions .btn-cta { display: none; }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  --btn-bg: var(--surface); --btn-fg: var(--text); --btn-bd: var(--border);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--r-pill);
  background: var(--btn-bg); color: var(--btn-fg); border: 1px solid var(--btn-bd);
  font-weight: 700; font-size: 15px; cursor: pointer; white-space: nowrap;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), filter var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  --btn-fg: var(--accent-ink); --btn-bd: transparent;
  background: linear-gradient(100deg, var(--accent), #7ce8fa);
  box-shadow: var(--glow);
}
.btn-primary:hover { filter: brightness(1.06); box-shadow: 0 0 0 1px rgba(22,224,184,.4), 0 18px 44px -14px rgba(22,224,184,.5); }
.btn-ghost { --btn-bg: transparent; }
.btn-ghost:hover { --btn-bg: var(--surface); border-color: var(--accent); }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-block { width: 100%; }
.btn[disabled], .btn.is-disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* ---------- 7. 卡片 / 徽章 ---------- */
.card {
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 92%, transparent), var(--surface));
  border: 1px solid var(--border-soft); border-radius: var(--r-lg);
  padding: var(--sp-5); box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card--hover:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); box-shadow: var(--shadow); }
.card__title { font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 10px; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; border-radius: var(--r-pill); font-size: 12.5px; font-weight: 700;
  background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
}
.badge--soft { background: var(--surface-2); color: var(--text-2); border-color: var(--border); }
.badge--warn { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 34%, transparent); }

.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: var(--sp-9); padding: var(--sp-7) 0 var(--sp-5);
  border-top: 1px solid var(--border-soft);
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--surface) 55%, transparent));
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: var(--sp-6); }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid h4 { font-size: 14px; letter-spacing: .06em; color: var(--text); margin-bottom: var(--sp-3); }
.footer-grid a, .footer-grid p { color: var(--muted); font-size: 14.5px; }
.footer-grid a:hover { color: var(--accent); }
.footer-links li + li { margin-top: 9px; }
.footer-bottom {
  margin-top: var(--sp-6); padding-top: var(--sp-4);
  border-top: 1px solid var(--border-soft);
  display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; justify-content: space-between;
  color: var(--muted); font-size: 13.5px;
}
.footer-bottom .beian { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; }
.footer-bottom a:hover { color: var(--accent); }

/* ---------- 9. 动效 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }
.reveal[data-d="4"] { transition-delay: .32s; }

@keyframes floaty { 0%,100%{ transform: translateY(0); } 50%{ transform: translateY(-10px); } }
@keyframes pulseGlow { 0%,100%{ opacity:.55; } 50%{ opacity:1; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 10. 通用提示 ---------- */
.notice {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 12px 16px; border-radius: var(--r-md);
  border: 1px solid var(--border); background: var(--surface-2);
  font-size: 14px; color: var(--text-2);
}
.notice--warn { border-color: color-mix(in srgb, var(--warn) 40%, var(--border)); background: color-mix(in srgb, var(--warn) 10%, var(--surface)); color: var(--text); }
.notice svg { width: 18px; height: 18px; flex: 0 0 auto; margin-top: 2px; }