:root { color-scheme: light; --paper: oklch(98% .006 250); --surface: oklch(99.4% .003 250); --raised: oklch(100% 0 0); --ink: oklch(21% .018 260); --muted: oklch(44% .018 255); --tertiary: oklch(57% .016 255); --line: oklch(86% .014 250); --accent: oklch(60% .19 250); --accent-hover: oklch(54% .2 250); --accent-ink: oklch(99% .003 250); --success: oklch(60% .15 155); --danger: oklch(58% .2 25); --focus: oklch(60% .19 250); --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; --ease: cubic-bezier(.16,1,.3,1); }
[data-theme="dark"] { color-scheme: dark; --paper: oklch(14% .012 60); --surface: oklch(20% .014 60); --raised: oklch(23% .016 60); --ink: oklch(95% .012 80); --muted: oklch(75% .018 75); --tertiary: oklch(62% .018 70); --line: oklch(34% .02 66); --accent: oklch(78% .15 80); --accent-hover: oklch(84% .13 82); --accent-ink: oklch(18% .018 60); --success: oklch(72% .14 155); --danger: oklch(70% .17 25); --focus: oklch(88% .12 82); }
* { box-sizing: border-box; }
html, body { min-width: 320px; overflow-x: clip; }
html { background: var(--paper); }
body { margin: 0; min-height: 100dvh; color: var(--ink); background: var(--paper); font: 16px/1.5 var(--font); -webkit-font-smoothing: antialiased; }
button, input { font: inherit; }
button, input { outline: 2px solid transparent; outline-offset: 2px; }
button:focus-visible, input:focus-visible { outline-color: var(--focus); }
.theme-switch { position: fixed; z-index: 10; inset-block-start: max(16px, env(safe-area-inset-top)); inset-inline-end: max(16px, env(safe-area-inset-right)); display: grid; place-items: center; width: 44px; height: 44px; padding: 0; color: var(--muted); border: 1px solid var(--line); border-radius: 14px; background: color-mix(in oklch, var(--surface) 82%, transparent); box-shadow: 0 12px 32px oklch(20% .02 255 / .08); backdrop-filter: blur(20px) saturate(130%); cursor: pointer; }
.theme-switch svg { width: 19px; fill: currentColor; }
.theme-switch .moon, [data-theme="dark"] .theme-switch .sun { display: none; }
[data-theme="dark"] .theme-switch .moon { display: block; }
.login-shell { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(390px, .95fr); width: min(980px, calc(100% - 32px)); min-height: min(680px, calc(100dvh - 64px)); margin: 32px auto; overflow: hidden; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); box-shadow: 0 28px 90px oklch(20% .02 255 / .1); }
.brand-panel, .login-panel { padding: clamp(36px, 6vw, 72px); }
.brand-panel { display: flex; flex-direction: column; justify-content: space-between; color: var(--accent-ink); background: var(--accent); }
.wordmark, .mobile-wordmark { display: flex; align-items: center; gap: 11px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; flex: 0 0 42px; color: var(--accent); border-radius: 13px; background: var(--accent-ink); font-size: .72rem; font-weight: 780; }
.wordmark strong, .wordmark small { display: block; }
.wordmark strong { font-size: .94rem; }
.wordmark small { margin-top: 1px; opacity: .7; font-size: .59rem; font-weight: 700; letter-spacing: .12em; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: .69rem; font-weight: 760; letter-spacing: .14em; }
.brand-panel .eyebrow { color: color-mix(in oklch, var(--accent-ink) 72%, transparent); }
.brand-message h1 { margin: 0; font-size: clamp(2.5rem, 5vw, 4.5rem); line-height: .98; letter-spacing: -.065em; }
.brand-message > p:last-child { max-width: 34ch; margin: 22px 0 0; color: color-mix(in oklch, var(--accent-ink) 74%, transparent); }
.trust-line { display: flex; flex-wrap: wrap; gap: 8px 18px; color: color-mix(in oklch, var(--accent-ink) 72%, transparent); font-size: .68rem; font-weight: 680; }
.trust-line span::before { content: ""; display: inline-block; width: 5px; height: 5px; margin: 0 7px 1px 0; border-radius: 50%; background: currentColor; }
.login-panel { align-self: center; }
.mobile-wordmark { display: none; margin-bottom: 48px; }
.mobile-wordmark .brand-mark { color: var(--accent-ink); background: var(--accent); }
.mobile-wordmark strong { font-size: .94rem; }
.login-panel h2 { margin: 0; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.05; letter-spacing: -.055em; }
.intro { margin: 10px 0 30px; color: var(--muted); }
form { display: grid; gap: 15px; }
form > label:not(.remember-row) { display: grid; gap: 7px; color: var(--muted); font-size: .78rem; font-weight: 700; }
input:not([type="checkbox"]) { width: 100%; min-height: 48px; padding: 0 14px; color: var(--ink); border: 1px solid var(--line); border-radius: 14px; background: var(--raised); transition: border-color 180ms var(--ease), background 180ms var(--ease); }
input:not([type="checkbox"]):focus { border-color: var(--accent); }
.password-field { position: relative; display: block; }
.password-field input { padding-inline-end: 52px; }
.reveal-button { position: absolute; inset-block: 2px; inset-inline-end: 2px; display: grid; place-items: center; width: 44px; padding: 0; color: var(--tertiary); border: 0; border-radius: 12px; background: transparent; cursor: pointer; }
.reveal-button svg { width: 19px; fill: currentColor; }
.reveal-button .eye-closed, .reveal-button[aria-pressed="true"] .eye-open { display: none; }
.reveal-button[aria-pressed="true"] .eye-closed { display: block; }
.remember-row { position: relative; display: flex; align-items: center; gap: 12px; min-height: 56px; padding: 7px 2px; cursor: pointer; user-select: none; }
.remember-row input { position: absolute; opacity: 0; pointer-events: none; }
.checkmark { position: relative; width: 24px; height: 24px; flex: 0 0 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--raised); }
.remember-row input:checked + .checkmark { border-color: var(--accent); background: var(--accent); }
.remember-row input:checked + .checkmark::after { content: ""; position: absolute; width: 9px; height: 5px; inset: 6px auto auto 6px; border: solid var(--accent-ink); border-width: 0 0 2px 2px; transform: rotate(-45deg); }
.remember-row input:focus-visible + .checkmark { outline: 2px solid var(--focus); outline-offset: 2px; }
.remember-row strong, .remember-row small { display: block; }
.remember-row strong { font-size: .82rem; }
.remember-row small { margin-top: 1px; color: var(--tertiary); font-size: .71rem; }
.submit-button { display: flex; align-items: center; justify-content: space-between; width: 100%; min-height: 50px; padding: 0 17px; color: var(--accent-ink); border: 1px solid var(--accent); border-radius: 14px; background: var(--accent); cursor: pointer; transition: background 180ms var(--ease), transform 90ms var(--ease); }
.submit-button svg { width: 20px; fill: currentColor; }
.submit-button:active, .theme-switch:active, .reveal-button:active { transform: translateY(1px); }
.submit-button:disabled { opacity: .56; cursor: wait; }
.message { min-height: 1.5em; margin: -2px 2px 0; color: var(--danger); font-size: .75rem; text-align: center; }
.message.is-progress { color: var(--muted); }
.security-note { display: flex; align-items: center; gap: 7px; margin: 12px 0 0; color: var(--muted); font-size: .72rem; }
.security-note svg { width: 15px; fill: var(--success); }
@media (hover: hover) and (pointer: fine) { .theme-switch:hover, .reveal-button:hover { color: var(--ink); } .submit-button:hover { background: var(--accent-hover); } }
@media (max-width: 760px) { .login-shell { grid-template-columns: 1fr; width: min(460px, calc(100% - 24px)); min-height: 0; margin: max(64px, env(safe-area-inset-top)) auto 24px; } .brand-panel { display: none; } .login-panel { padding: clamp(28px, 8vw, 44px); } .mobile-wordmark { display: flex; } }
@media (max-width: 380px) { .login-shell { width: calc(100% - 20px); border-radius: 20px; } .login-panel { padding-inline: 22px; } .theme-switch { inset-inline-end: 10px; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: 1ms !important; } }

/* YYD Core brand asset */
.brand-mark {
  padding: 0;
  overflow: hidden;
  background: transparent;
}
.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}