/* ============================================
   BIG3 · The Oath · Shared Styles
   Supports dark (default) + light theme
   ============================================ */

:root,
:root[data-theme="dark"]{
  --bg:#08070a;
  --bg-2:#0d0c10;
  --surface:#141318;
  --surface-2:#1c1a21;
  --text:#f3f1ea;
  --text-2:#a8a39a;
  --text-3:#6f6a62;
  --line:rgba(255,255,255,.06);
  --line-2:rgba(255,255,255,.12);
  --gold:#d4af37;
  --gold-light:#e8c46c;
  --gold-soft:#b8941f;
  --gold-dim:rgba(212,175,55,.18);
  --gold-line:rgba(212,175,55,.28);
  --bg-glow-1:rgba(212,175,55,.10);
  --bg-glow-2:rgba(212,175,55,.06);
  --nav-bg:rgba(8,7,10,.78);
  --gold-on-text:#1a1409;
  --shadow:0 8px 32px rgba(0,0,0,.4);
}

:root[data-theme="light"]{
  --bg:#faf8f3;
  --bg-2:#f4f0e6;
  --surface:#ffffff;
  --surface-2:#f7f3eb;
  --text:#1a1612;
  --text-2:#5a554c;
  --text-3:#8a8378;
  --line:rgba(0,0,0,.08);
  --line-2:rgba(0,0,0,.14);
  --gold:#a8851f;
  --gold-light:#8a6e1a;
  --gold-soft:#c4a040;
  --gold-dim:rgba(168,133,31,.14);
  --gold-line:rgba(168,133,31,.32);
  --bg-glow-1:rgba(168,133,31,.06);
  --bg-glow-2:rgba(168,133,31,.03);
  --nav-bg:rgba(250,248,243,.85);
  --gold-on-text:#ffffff;
  --shadow:0 4px 16px rgba(0,0,0,.06);
}

:root{
  --font-display:'Big Shoulders Display','Noto Sans SC',sans-serif;
  --font-body:'Manrope','Noto Sans SC',sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --max-w:1280px;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-weight:400;-webkit-font-smoothing:antialiased;line-height:1.6;transition:background .35s ease,color .35s ease}
body{
  background:
    radial-gradient(1100px 600px at 85% -10%, var(--bg-glow-1), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, var(--bg-glow-2), transparent 55%),
    var(--bg);
  min-height:100vh;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}

/* ====== Layout ====== */
.container{max-width:var(--max-w);margin:0 auto;padding:0 32px}
@media (max-width:768px){.container{padding:0 20px}}

/* ====== Nav ====== */
.nav{
  position:sticky;top:0;z-index:50;
  background:var(--nav-bg);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:background .35s ease;
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.nav-brand{display:flex;align-items:center;gap:14px}
.nav-brand img{width:40px;height:40px;object-fit:contain}
.nav-brand-text{display:flex;flex-direction:column;line-height:1}
.nav-brand-name{font-family:var(--font-display);font-weight:900;font-size:20px;letter-spacing:.04em;color:var(--text)}
.nav-brand-name span{color:var(--gold)}
.nav-brand-sub{font-family:var(--font-mono);font-size:10.5px;color:var(--text-3);letter-spacing:.22em;margin-top:5px;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:38px}
.nav-links a{font-size:14px;color:var(--text-2);font-weight:500;letter-spacing:.02em;transition:color .2s ease;position:relative;padding:6px 0}
.nav-links a:hover{color:var(--gold-light)}
.nav-links a.active{color:var(--text)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1.5px;background:var(--gold)}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-auth-group{display:flex;align-items:center;gap:8px}
.nav-user-pill{
  display:inline-flex;align-items:center;gap:9px;min-width:0;max-width:230px;
  padding:7px 10px;border:1px solid var(--gold-line);background:var(--gold-dim);color:var(--text);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.03);
}
.nav-user-dot{width:7px;height:7px;border-radius:50%;background:var(--gold);box-shadow:0 0 12px var(--gold)}
.nav-user-text{display:flex;flex-direction:column;min-width:0;line-height:1.08}
.nav-user-main{font-size:12.5px;font-weight:800;max-width:112px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;letter-spacing:.01em}
.nav-user-sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.08em;color:var(--gold-light);white-space:nowrap;margin-top:3px}
.nav-manage-link{padding-left:14px;padding-right:14px}
.nav-logout{padding-left:12px;padding-right:12px}
.nav-logout-short{display:none}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:2px;
  font-family:var(--font-body);font-size:13px;font-weight:600;letter-spacing:.04em;
  cursor:pointer;transition:all .25s ease;border:1px solid transparent;
  text-transform:uppercase;
}
.btn-ghost{color:var(--text-2);background:transparent;border-color:var(--line-2)}
.btn-ghost:hover{color:var(--text);border-color:var(--text-2)}
.btn-gold{background:var(--gold);color:var(--gold-on-text);border-color:var(--gold)}
.btn-gold:hover{background:var(--gold-light);border-color:var(--gold-light)}
.btn-outline-gold{color:var(--gold-light);border-color:var(--gold-line);background:var(--gold-dim)}
.btn-outline-gold:hover{background:var(--gold-dim);border-color:var(--gold);color:var(--gold)}
.btn-lg{padding:15px 32px;font-size:14px}
.btn:disabled,.btn.is-busy{opacity:.58;cursor:not-allowed;filter:saturate(.72)}
.btn.is-busy::before{
  content:"";width:12px;height:12px;border:1.5px solid currentColor;border-right-color:transparent;border-radius:50%;
  animation:big3-spin .78s linear infinite;
}
@keyframes big3-spin{to{transform:rotate(360deg)}}

.big3-toast-host{
  position:fixed;right:18px;bottom:18px;z-index:9999;display:flex;flex-direction:column;gap:10px;
  width:min(360px,calc(100vw - 28px));pointer-events:none;
}
.big3-toast{
  pointer-events:auto;padding:12px 14px;border:1px solid var(--gold-line);background:rgba(20,19,24,.96);
  color:var(--gold-light);box-shadow:var(--shadow);font-size:13px;line-height:1.5;transform:translateY(8px);
  animation:big3-toast-in .2s ease forwards;
}
:root[data-theme="light"] .big3-toast{background:rgba(255,255,255,.96)}
.big3-toast.err{border-color:rgba(239,68,68,.45);color:#fca5a5;background:rgba(64,16,20,.96)}
:root[data-theme="light"] .big3-toast.err{background:rgba(255,245,245,.98);color:#b91c1c}
.big3-toast.leaving{animation:big3-toast-out .2s ease forwards}
@keyframes big3-toast-in{to{opacity:1;transform:translateY(0)}}
@keyframes big3-toast-out{to{opacity:0;transform:translateY(8px)}}
@media (max-width:640px){
  .big3-toast-host{left:14px;right:14px;bottom:14px;width:auto}
  .big3-toast{font-size:12.5px;padding:11px 12px}
}

/* Theme toggle button */
.theme-toggle{
  width:36px;height:36px;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line-2);background:transparent;color:var(--text-2);
  cursor:pointer;transition:all .2s;margin-right:4px;
}
.theme-toggle:hover{color:var(--gold);border-color:var(--gold-line)}
.theme-toggle svg{width:18px;height:18px;display:none}
:root[data-theme="dark"] .theme-toggle .icon-sun{display:block}
:root[data-theme="light"] .theme-toggle .icon-moon{display:block}

.nav-mobile-toggle{display:none;background:none;border:0;color:var(--text);font-size:24px;cursor:pointer}
@media (max-width:980px){
  .nav-inner{height:auto;min-height:74px;flex-wrap:wrap;row-gap:8px;padding-top:10px;padding-bottom:8px}
  .nav-links{
    order:3;display:flex;width:100%;gap:6px;overflow-x:auto;overscroll-behavior-x:contain;
    padding:6px 0 2px;-webkit-overflow-scrolling:touch;scrollbar-width:none
  }
  .nav-links::-webkit-scrollbar{display:none}
  .nav-links a{
    flex:0 0 auto;padding:7px 10px;border:1px solid var(--line-2);background:rgba(255,255,255,.025);
    font-size:12px;line-height:1;white-space:nowrap
  }
  .nav-links a.active{border-color:var(--gold-line);background:var(--gold-dim);color:var(--gold-light)}
  .nav-links a.active::after{display:none}
  .nav-mobile-toggle{display:none}
  .nav-cta > .btn-ghost{display:none}
  .nav-auth-group{gap:6px;min-width:0}
  .nav-user-pill{max-width:160px}
  .nav-user-sub{display:none}
  .nav-logout{display:inline-flex;padding:7px 9px;min-height:34px}
  .nav-logout-full{display:none}
  .nav-logout-short{display:inline}
}
@media (max-width:560px){
  .container{padding:0 14px}
  .nav-inner{min-height:64px}
  .nav-brand{gap:9px;min-width:0}
  .nav-brand img{width:34px;height:34px}
  .nav-brand-name{font-size:18px}
  .nav-brand-sub{font-size:9px;letter-spacing:.14em}
  .nav-cta{gap:6px}
  .nav-cta .btn{padding:8px 10px;font-size:12px;letter-spacing:.02em}
  .nav-logout{padding:7px 8px;min-width:42px}
  .nav-user-pill{max-width:122px;padding:6px 8px}
  .nav-user-main{max-width:72px;font-size:12px}
  .theme-toggle{width:34px;height:34px;margin-right:0}
}

/* ====== Section common ====== */
section{padding:96px 0;position:relative}
@media (max-width:768px){section{padding:64px 0}}

.section-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:56px;gap:32px;flex-wrap:wrap}
.section-title{
  font-family:var(--font-display);
  font-weight:900;font-size:clamp(38px,5vw,64px);line-height:.95;letter-spacing:-.005em;
  max-width:720px;
}
.section-title .gold{color:var(--gold)}
.section-link{font-family:var(--font-mono);font-size:12px;color:var(--text-2);letter-spacing:.22em;text-transform:uppercase;border-bottom:1px solid var(--gold);padding-bottom:6px;transition:color .2s}
.section-link:hover{color:var(--gold-light)}
.section-tag{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.28em;color:var(--gold-light);text-transform:uppercase;margin-bottom:14px}
.section-tag::before{content:"//";color:var(--gold);font-weight:700}

.eyebrow{display:inline-flex;align-items:center;gap:12px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.32em;color:var(--gold-light);text-transform:uppercase;margin-bottom:28px}
.eyebrow::before{content:"";width:32px;height:1px;background:var(--gold)}

/* ====== Footer ====== */
footer{background:var(--bg-2);border-top:1px solid var(--line);padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;margin-bottom:56px}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr;gap:36px}}
@media (max-width:480px){.footer-grid{grid-template-columns:1fr}}
.footer-brand{display:flex;flex-direction:column;gap:18px}
.footer-brand-row{display:flex;align-items:center;gap:14px}
.footer-brand-row img{width:48px;height:48px;object-fit:contain}
.footer-brand-row-t{font-family:var(--font-display);font-weight:900;font-size:22px;color:var(--text);line-height:1}
.footer-brand-row-s{font-family:var(--font-mono);font-size:10px;color:var(--gold);letter-spacing:.24em;text-transform:uppercase;margin-top:4px}
.footer-brand-desc{font-size:13.5px;color:var(--text-2);line-height:1.7;max-width:340px}
.footer-col-title{font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--gold-light);text-transform:uppercase;margin-bottom:18px}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:11px}
.footer-col li a{font-size:14px;color:var(--text-2);transition:color .2s}
.footer-col li a:hover{color:var(--gold-light)}
.footer-bottom{border-top:1px solid var(--line);padding-top:28px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-bottom-text{display:flex;align-items:center;flex-wrap:wrap;gap:8px 14px;font-family:var(--font-mono);font-size:11px;color:var(--text-3);letter-spacing:.12em}
.beian-link{color:var(--text-3);transition:color .2s}
.beian-link:hover{color:var(--gold-light)}
.footer-bottom-bage{font-family:var(--font-mono);font-size:10px;letter-spacing:.28em;color:var(--gold);text-transform:uppercase}