:root {
    --ink-900: #0b1f33;
    --ink-700: #24445c;
    --ink-600: #475569;
    --canvas: #f6f8fa;
    --surface: #ffffff;
    --surface-muted: #eef3f7;
    --border: #cbd5e1;
    --primary: #0f5f78;
    --primary-hover: #0b4a60;
    --signal: #0891b2;
    --focus: #0284c7;
    --danger: #991b1b;
    --danger-surface: #fef2f2;
    --font-ui: "Noto Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
    --font-brand: "IBM Plex Sans", "Noto Sans SC", "Microsoft YaHei UI", sans-serif;
    --font-data: "IBM Plex Mono", "Cascadia Code", Consolas, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; min-width: 320px; min-height: 100dvh; color: var(--ink-900); background: var(--canvas); font-family: var(--font-ui); font-size: 14px; line-height: 1.5; }
button, input { font: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.ui-icon { width: 20px; height: 20px; }
.auth-body { display: grid; place-items: center; padding: 24px; overflow-x: hidden; }
.auth-body::before { content: ""; position: fixed; inset: 0; z-index: -2; background: linear-gradient(135deg, #e9f2f6, var(--canvas) 45%, #e4edf3); }
.auth-body::after { content: ""; position: fixed; inset: 0; z-index: -1; opacity: .42; background-image: linear-gradient(rgba(15,95,120,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(15,95,120,.08) 1px, transparent 1px); background-size: 32px 32px; mask-image: radial-gradient(circle at 75% 50%, #000, transparent 62%); }
.auth-shell { width: min(980px, 100%); min-height: 560px; display: grid; grid-template-columns: 1.05fr .95fr; overflow: hidden; background: var(--surface); border: 1px solid rgba(203,213,225,.9); border-radius: 10px; box-shadow: 0 24px 70px rgba(11,31,51,.16); }
.auth-story { position: relative; display: flex; flex-direction: column; justify-content: space-between; padding: 42px; overflow: hidden; color: #fff; background: var(--ink-900); }
.auth-story::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(34,211,238,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(34,211,238,.08) 1px, transparent 1px); background-size: 32px 32px; mask-image: linear-gradient(145deg, #000 20%, transparent 78%); }
.auth-brand, .auth-story-copy, .auth-signal { position: relative; z-index: 1; }
.auth-brand { display: flex; align-items: center; gap: 12px; font: 700 18px/1 var(--font-brand); letter-spacing: .04em; }
.auth-brand-mark { width: 34px; height: 34px; display: grid; grid-template-columns: repeat(3, 1fr); align-items: end; gap: 3px; padding: 7px; color: #67e8f9; border: 1px solid rgba(103,232,249,.45); }
.auth-brand-mark i { display: block; background: currentColor; }
.auth-brand-mark i:nth-child(1) { height: 45%; }.auth-brand-mark i:nth-child(2) { height: 100%; }.auth-brand-mark i:nth-child(3) { height: 70%; }
.auth-story-copy span { color: #67e8f9; font: 650 10px/1.2 var(--font-data); letter-spacing: .15em; }
.auth-story-copy h1 { max-width: 440px; margin: 10px 0 14px; font: 650 34px/1.22 var(--font-brand); text-wrap: balance; }
.auth-story-copy p { max-width: 430px; margin: 0; color: #bdd0df; font-size: 15px; }
.auth-signal { position: relative; height: 76px; }
.auth-signal::before { content: ""; position: absolute; top: 29px; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, #22d3ee, transparent); box-shadow: 0 0 18px rgba(34,211,238,.5); }
.auth-signal i { position: absolute; top: 20px; width: 20px; height: 20px; background: #a5f3fc; border: 5px solid rgba(11,31,51,.8); border-radius: 50%; box-shadow: 0 0 0 1px #22d3ee; }
.auth-signal i:nth-child(1) { left: 4%; }.auth-signal i:nth-child(2) { left: 48%; }.auth-signal i:nth-child(3) { right: 4%; }
.auth-panel { display: grid; place-items: center; padding: 42px; }
.auth-card { width: min(360px, 100%); }
.auth-card-header { margin-bottom: 28px; }
.auth-card-header span { color: var(--primary); font: 650 10px/1.2 var(--font-data); letter-spacing: .14em; }
.auth-card-header h2 { margin: 8px 0 6px; font: 650 26px/1.25 var(--font-brand); }
.auth-card-header p { margin: 0; color: var(--ink-600); }
.auth-form { display: grid; gap: 16px; }
.form-group { display: grid; gap: 6px; }
.auth-form label { color: var(--ink-700); font-size: 12px; font-weight: 700; }
.auth-form input[type="text"], .auth-form input[type="password"] { width: 100%; min-height: 42px; padding: 9px 11px; color: var(--ink-900); background: var(--surface); border: 1px solid var(--border); border-radius: 4px; outline: none; transition: border-color 120ms, box-shadow 120ms; }
.auth-form input:focus { border-color: var(--focus); box-shadow: 0 0 0 3px rgba(2,132,199,.14); }
.password-field { position: relative; }
.password-field input { padding-right: 64px !important; }
.password-toggle { position: absolute; top: 50%; right: 4px; min-width: 54px; min-height: 34px; display: inline-flex; align-items: center; justify-content: center; padding: 4px 8px; color: var(--primary); background: transparent; border: 0; border-radius: 4px; transform: translateY(-50%); cursor: pointer; font-size: 12px; font-weight: 700; }
.password-toggle:hover { background: var(--surface-muted); }
.form-remember label { min-height: 32px; display: flex; align-items: center; gap: 8px; color: var(--ink-600); cursor: pointer; font-weight: 500; }
.form-remember input { width: 16px; height: 16px; accent-color: var(--primary); }
.btn { min-height: 42px; display: inline-flex; align-items: center; justify-content: center; padding: 9px 16px; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; font-weight: 700; }
.btn-primary { color: #fff; background: var(--primary); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-block { width: 100%; }
.auth-alerts { display: grid; gap: 8px; margin-bottom: 18px; }
.alert { padding: 10px 12px; border: 1px solid var(--border); border-radius: 4px; }
.alert-error { color: var(--danger); background: var(--danger-surface); border-color: #fecaca; }
.alert-success { color: #166534; background: #dcfce7; border-color: #bbf7d0; }
.alert-info { color: #075985; background: #e0f2fe; border-color: #bae6fd; }
.auth-footnote { margin-top: 22px; color: var(--ink-600); font-size: 12px; text-align: center; }
@media (max-width: 780px) {
    .auth-body { padding: 12px; }
    .auth-shell { min-height: auto; grid-template-columns: 1fr; }
    .auth-story { min-height: 190px; padding: 24px; }
    .auth-story-copy h1 { font-size: 26px; }
    .auth-story-copy p, .auth-signal { display: none; }
    .auth-panel { padding: 30px 24px; }
    .auth-form input[type="text"], .auth-form input[type="password"], .btn, .password-toggle { min-height: 44px; }
    .password-toggle { min-width: 60px; right: 0; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; } }