/* ── TOKENS ── */
:root{
  --bg:#080a0f;
  --bg-2:#0e1018;
  --bg-3:#13161f;
  --bg-card:#111420;
  --bg-card-2:#161924;
  --border:rgba(255,255,255,0.06);
  --border-md:rgba(255,255,255,0.1);
  --border-lg:rgba(255,255,255,0.16);
  --text-1:#eef0f8;
  --text-2:#8891aa;
  --text-3:#4a5168;
  --accent:#5b7fff;
  --accent-2:#7b96ff;
  --accent-glow:rgba(91,127,255,0.18);
  --accent-dim:rgba(91,127,255,0.08);
  --purple:#9d72ff;
  --purple-dim:rgba(157,114,255,0.1);
  --green:#34d399;
  --radius:14px;
  --radius-sm:8px;
  --radius-xs:6px;
  --nav-h:60px;
  --font-title:'Space Grotesk','Noto Sans TC','PingFang TC','Microsoft JhengHei',sans-serif;
  --font-body:'Inter','Noto Sans TC','PingFang TC',system-ui,sans-serif;
}
[data-theme="light"]{
  --bg:#f0f2f9;
  --bg-2:#e8ebf5;
  --bg-3:#dde1f0;
  --bg-card:#ffffff;
  --bg-card-2:#f7f8fd;
  --border:rgba(0,0,0,0.06);
  --border-md:rgba(0,0,0,0.1);
  --border-lg:rgba(0,0,0,0.16);
  --text-1:#0f1120;
  --text-2:#4b5572;
  --text-3:#9aa0b8;
  --accent:#3d60f0;
  --accent-2:#2d4ed8;
  --accent-glow:rgba(61,96,240,0.14);
  --accent-dim:rgba(61,96,240,0.07);
  --purple:#7c3aed;
  --purple-dim:rgba(124,58,237,0.08);
  --green:#059669;
}

/* ── RESET ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-body);background:var(--bg);color:var(--text-1);line-height:1.6;min-height:100vh;transition:background .25s,color .25s}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

/* ── NAV ── */
nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  background:rgba(8,10,15,0.82);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;
  padding:0 clamp(16px,4vw,40px);
  transition:background .25s,border-color .25s;
}
[data-theme="light"] nav{background:rgba(240,242,249,0.85)}
.nav-logo{display:flex;align-items:center;gap:9px;font-family:var(--font-title);font-size:17px;font-weight:700;color:var(--text-1);flex-shrink:0;letter-spacing:-.01em}
.nav-logo img{width:28px;height:28px;border-radius:8px}
.nav-links{display:flex;align-items:center;gap:1px;margin-left:24px;flex:1;overflow:hidden}
.nav-link{padding:5px 10px;font-size:13.5px;font-weight:500;color:var(--text-2);border-radius:var(--radius-xs);transition:color .15s,background .15s;white-space:nowrap}
.nav-link:hover{color:var(--text-1);background:var(--border-md)}
.nav-link.active{color:var(--accent);background:var(--accent-dim)}
.nav-right{display:flex;align-items:center;gap:6px;margin-left:auto;flex-shrink:0;padding-left:16px}
/* ── LANG DROPDOWN ── */
.lang-dropdown{position:relative;flex-shrink:0}
.lang-btn{
  display:flex;align-items:center;gap:5px;
  padding:5px 10px;font-size:12px;font-weight:700;
  border-radius:var(--radius-xs);border:1px solid var(--border-md);
  color:var(--text-2);transition:all .15s;letter-spacing:.03em;white-space:nowrap;cursor:pointer;
}
.lang-btn:hover{color:var(--text-1);border-color:var(--border-lg);background:var(--bg-2)}
.lang-btn svg{width:10px;height:10px;transition:transform .2s;flex-shrink:0;opacity:.6}
.lang-dropdown.open .lang-btn{color:var(--text-1);border-color:var(--border-lg);background:var(--bg-2)}
.lang-dropdown.open .lang-btn svg{transform:rotate(180deg)}
.lang-menu{
  display:none;
  position:absolute;top:calc(100% + 6px);right:0;
  background:var(--bg-card);
  border:1px solid var(--border-md);
  border-radius:var(--radius-sm);
  padding:4px;min-width:130px;
  box-shadow:0 8px 24px rgba(0,0,0,.3);
  z-index:200;
}
[data-theme="light"] .lang-menu{box-shadow:0 8px 24px rgba(0,0,0,.12)}
.lang-dropdown.open .lang-menu{display:block}
.lang-option{
  display:flex;align-items:center;gap:8px;
  padding:7px 10px;font-size:13px;font-weight:500;
  color:var(--text-2);border-radius:6px;cursor:pointer;
  transition:all .12s;white-space:nowrap;
}
.lang-option:hover{color:var(--text-1);background:var(--bg-2)}
.lang-option.active{color:var(--accent);background:var(--accent-dim)}
.lang-option .flag{font-size:15px;line-height:1}
.btn-icon{width:32px;height:32px;border-radius:var(--radius-xs);display:flex;align-items:center;justify-content:center;color:var(--text-2);border:1px solid var(--border-md);transition:all .15s;font-size:14px}
.btn-icon:hover{color:var(--text-1);border-color:var(--border-lg);background:var(--bg-2)}
.btn-invite{padding:7px 16px;background:var(--accent);color:#fff;font-size:13px;font-weight:600;border-radius:var(--radius-xs);transition:all .15s;display:flex;align-items:center;gap:6px;white-space:nowrap;letter-spacing:.01em}
.btn-invite:hover{opacity:.88;transform:translateY(-1px);box-shadow:0 4px 16px var(--accent-glow)}
.hamburger{display:none;width:32px;height:32px;border-radius:var(--radius-xs);border:1px solid var(--border-md);align-items:center;justify-content:center;flex-direction:column;gap:4px;padding:7px;flex-shrink:0}
.hamburger span{display:block;width:16px;height:1.5px;background:var(--text-2);border-radius:2px;transition:all .2s}

/* ── MOBILE MENU ── */
.mobile-menu{display:none;position:fixed;top:var(--nav-h);left:0;right:0;z-index:99;background:var(--bg);border-bottom:1px solid var(--border);padding:10px;flex-direction:column;gap:2px;max-height:calc(100vh - var(--nav-h));overflow-y:auto}
.mobile-menu.open{display:flex}
.mobile-nav-link{padding:11px 14px;font-size:15px;font-weight:500;color:var(--text-2);border-radius:var(--radius-sm);transition:all .15s}
.mobile-nav-link:hover,.mobile-nav-link.active{color:var(--accent);background:var(--accent-dim)}
.mobile-invite{margin-top:6px;padding:13px 14px;background:var(--accent);color:#fff;font-size:15px;font-weight:600;border-radius:var(--radius-sm);text-align:center;display:block}

/* ── LAYOUT ── */
.container{max-width:1080px;margin:0 auto;padding:0 clamp(16px,4vw,24px)}
.section{padding:clamp(56px,8vw,96px) 0}
.section-header{margin-bottom:clamp(36px,5vw,56px)}
.section-eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.section-eyebrow::before{content:'';width:16px;height:1.5px;background:var(--accent);border-radius:2px}
.section-title{font-family:var(--font-title);font-size:clamp(26px,4vw,44px);font-weight:700;letter-spacing:-.025em;line-height:1.12;margin-bottom:16px;color:var(--text-1)}
.section-sub{font-size:clamp(14px,2vw,16px);color:var(--text-2);max-width:520px;line-height:1.75}

/* ── BUTTONS ── */
.btn-primary{padding:11px 22px;background:var(--accent);color:#fff;font-size:14px;font-weight:600;border-radius:var(--radius-sm);display:inline-flex;align-items:center;gap:8px;transition:all .2s;cursor:pointer;letter-spacing:.01em}
.btn-primary:hover{opacity:.88;transform:translateY(-2px);box-shadow:0 8px 28px var(--accent-glow)}
.btn-secondary{padding:11px 22px;background:transparent;color:var(--text-2);font-size:14px;font-weight:600;border-radius:var(--radius-sm);border:1px solid var(--border-md);display:inline-flex;align-items:center;gap:8px;transition:all .2s}
.btn-secondary:hover{color:var(--text-1);background:var(--bg-2);border-color:var(--border-lg);transform:translateY(-2px)}

/* ── FEATURE CARDS ── */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.feature-card{background:var(--bg-card);padding:clamp(24px,3vw,32px);transition:background .2s}
.feature-card:hover{background:var(--bg-card-2)}
.feature-icon{width:40px;height:40px;border-radius:10px;background:var(--accent-dim);display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:20px}
.feature-title{font-size:15px;font-weight:650;margin-bottom:8px;color:var(--text-1)}
.feature-desc{font-size:13.5px;color:var(--text-2);line-height:1.7}

/* ── STEPS ── */
.steps{display:flex;flex-direction:column}
.step{display:flex;gap:clamp(16px,3vw,28px);padding:clamp(20px,3vw,28px) 0;border-bottom:1px solid var(--border);align-items:flex-start}
.step:last-child{border-bottom:none}
.step-num{flex-shrink:0;width:36px;height:36px;border-radius:50%;background:var(--accent-dim);border:1px solid rgba(91,127,255,0.25);display:flex;align-items:center;justify-content:center;font-family:var(--font-title);font-size:13px;font-weight:700;color:var(--accent);margin-top:2px}
.step-title{font-size:15px;font-weight:650;margin-bottom:6px;color:var(--text-1)}
.step-desc{font-size:13.5px;color:var(--text-2);line-height:1.7}

/* ── COMMANDS ── */
.commands-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:8px}
.cmd-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;display:flex;gap:12px;align-items:flex-start;transition:border-color .15s}
.cmd-card:hover{border-color:var(--border-md)}
.cmd-tag{flex-shrink:0;background:var(--bg-3);border:1px solid var(--border-md);border-radius:5px;padding:2px 7px;font-family:monospace;font-size:11.5px;color:var(--accent-2);white-space:nowrap;margin-top:1px;letter-spacing:.01em}
.cmd-desc{font-size:12.5px;color:var(--text-2);line-height:1.55;min-width:0}
.cmd-section-title{font-family:var(--font-title);font-size:15px;font-weight:700;margin:40px 0 14px;padding-bottom:10px;border-bottom:1px solid var(--border);color:var(--text-1);display:flex;align-items:center;gap:10px}
.cmd-section-title:first-of-type{margin-top:0}
.cmd-badge{font-size:10.5px;font-weight:600;padding:2px 8px;border-radius:100px;font-family:var(--font-body)}
.cmd-badge.user{background:var(--accent-dim);color:var(--accent-2)}
.cmd-badge.admin{background:var(--purple-dim);color:var(--purple)}

/* ── CTA ── */
.cta-banner{position:relative;overflow:hidden;background:linear-gradient(135deg,var(--bg-card) 0%,var(--bg-card-2) 100%);border:1px solid var(--border-md);border-radius:20px;padding:clamp(40px,6vw,72px) clamp(24px,5vw,64px);text-align:center;margin:clamp(40px,6vw,80px) 0}
.cta-banner::before{content:'';position:absolute;top:-100px;left:50%;transform:translateX(-50%);width:600px;height:300px;background:radial-gradient(ellipse at center,var(--accent-glow) 0%,transparent 65%);pointer-events:none}
.cta-banner h2{font-family:var(--font-title);font-size:clamp(22px,4vw,38px);font-weight:700;margin-bottom:12px;letter-spacing:-.02em}
.cta-banner p{font-size:clamp(14px,2vw,16px);color:var(--text-2);margin-bottom:32px;max-width:480px;margin-left:auto;margin-right:auto}

/* ── LEGAL ── */
.legal-page{padding:clamp(48px,6vw,88px) 0 clamp(60px,8vw,120px)}
.legal-header{margin-bottom:clamp(32px,4vw,52px)}
.legal-header h1{font-family:var(--font-title);font-size:clamp(30px,5vw,52px);font-weight:700;letter-spacing:-.025em;margin-bottom:10px}
.legal-header .meta{font-size:13px;color:var(--text-3)}
.legal-layout{display:grid;grid-template-columns:170px 1fr;gap:clamp(24px,4vw,64px);align-items:start}
.legal-nav{display:flex;flex-direction:column;gap:0;position:sticky;top:calc(var(--nav-h) + 20px);border:none}
.legal-nav a{all:unset;display:block;font-size:12.5px;color:var(--text-3);padding:6px 12px;border-radius:6px;border-left:2px solid transparent;cursor:pointer;white-space:nowrap;line-height:1.4;transition:color .15s,background .15s,border-color .15s;margin-bottom:1px}
.legal-nav a:hover,.legal-nav a.active{color:var(--accent);border-left-color:var(--accent);background:var(--accent-dim)}
.legal-content{max-width:700px}
.legal-content h2{font-size:18px;font-weight:650;margin:40px 0 12px;padding-top:28px;border-top:1px solid var(--border);color:var(--text-1)}
.legal-content h2:first-of-type{margin-top:0;padding-top:0;border-top:none}
.legal-content p{font-size:14.5px;color:var(--text-2);line-height:1.8;margin-bottom:12px}
.legal-content ul{margin:8px 0 14px 18px}
.legal-content li{font-size:14.5px;color:var(--text-2);line-height:1.8;margin-bottom:6px}
.legal-content a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}

/* ── FOOTER ── */
footer{border-top:1px solid var(--border);padding:clamp(24px,4vw,36px) 0;margin-top:auto}
.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px}
.footer-logo{display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:600;color:var(--text-1)}
.footer-logo img{width:20px;height:20px;border-radius:6px}
.footer-links{display:flex;gap:clamp(12px,2vw,24px);flex-wrap:wrap}
.footer-link{font-size:13px;color:var(--text-3);transition:color .15s}
.footer-link:hover{color:var(--text-2)}

/* ── 404 ── */
.page-404{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--nav-h) 24px 0;text-align:center}
.error-num{font-family:var(--font-title);font-size:clamp(80px,18vw,160px);font-weight:700;line-height:1;background:linear-gradient(135deg,var(--accent),var(--purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;opacity:.2;margin-bottom:-16px}
.error-title{font-family:var(--font-title);font-size:clamp(20px,4vw,28px);font-weight:700;margin-bottom:10px}
.error-desc{font-size:15px;color:var(--text-2);margin-bottom:32px}

/* ── RESPONSIVE ── */
@media(max-width:900px){
  .nav-link{padding:5px 7px;font-size:13px}
  .legal-layout{grid-template-columns:150px 1fr;gap:28px}
}
@media(max-width:768px){
  .hamburger{display:flex}
  .nav-links,.nav-right{display:none}
  .legal-layout{grid-template-columns:1fr}
  .legal-nav{display:none}
  .footer-inner{flex-direction:column;align-items:flex-start}
  .features-grid{grid-template-columns:1fr;gap:0}
  .commands-grid{grid-template-columns:1fr}
  .cmd-card{flex-direction:column;gap:6px}
  .step{gap:14px}
  .hero-cta{flex-direction:column;align-items:stretch}
  .btn-primary,.btn-secondary{justify-content:center}
}
@media(max-width:480px){
  .cta-banner{border-radius:14px;padding:32px 20px}
  .feature-card{padding:22px}
}