:root{--brand:#0d9488;--brand-dark:#0f766e;--brand-deep:#115e59;--brand-soft:#e0f2f1;--border:#e2e8f0;--bg:#e9edf1;--ink:#1f2937;--muted:#64748b;--green:#10b981;--amber:#f59e0b;--red:#dc2626;--blue:#3b82f6}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:Arial,Microsoft YaHei,PingFang SC,sans-serif;font-size:14px;background:var(--bg);color:var(--ink);min-height:100vh;display:flex;flex-direction:column}a{color:var(--brand-dark)}.app-header{flex:0 0 auto;background:linear-gradient(135deg,#0f766e,#0d9488 60%,#14b8a6);color:#fff;box-shadow:0 2px 10px rgba(15,118,110,.18)}.app-header-inner{display:flex;align-items:center;gap:16px;padding:0 24px;height:52px;max-width:1080px;margin:0 auto}.app-brand{display:flex;align-items:baseline;gap:9px;color:#fff;text-decoration:none;white-space:nowrap;flex:0 0 auto}.app-brand,.app-brand h1{font-weight:700;font-size:16px;letter-spacing:.5px}.app-brand h1{margin:0}.app-brand 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(max-width:768px){.settings-layout{flex-direction:column;gap:16px}.settings-nav{width:100%;position:static;flex-direction:row;overflow-x:auto}.settings-nav-item{white-space:nowrap}.next-level-perks,.quota-grid{grid-template-columns:1fr}}