:root {
    --color-ink: #252321;
    --color-muted: #6f6a65;
    --color-paper: #f5f1eb;
    --color-surface: #fffdf9;
    --color-line: #ddd5cc;
    --color-accent: #8d302b;
    --color-accent-dark: #67201d;
    --color-accent-soft: #f2dfda;
    --color-success: #32624b;
    --shadow-soft: 0 18px 50px rgba(48, 39, 31, 0.08);
    --radius: 6px;
    --max-width: 1240px;
    font-family: "IBM Plex Sans", "PingFang SC", "Microsoft YaHei",
        "Noto Sans CJK SC", sans-serif;
    color: var(--color-ink);
    background: var(--color-paper);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--color-paper);
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        linear-gradient(90deg, rgba(141, 48, 43, 0.035) 1px, transparent 1px),
        var(--color-paper);
    background-size: 96px 100%;
    line-height: 1.62;
}

a {
    color: var(--color-accent);
    text-underline-offset: 0.2em;
}

a:hover {
    color: var(--color-accent-dark);
}

.skip-link {
    position: fixed;
    z-index: 20;
    top: 8px;
    left: 8px;
    padding: 8px 12px;
    transform: translateY(-150%);
    color: white;
    background: var(--color-accent);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    border-bottom: 1px solid var(--color-line);
    background: rgba(255, 253, 249, 0.92);
    backdrop-filter: blur(12px);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(calc(100% - 40px), var(--max-width));
    min-height: 76px;
    margin: auto;
}

.brand {
    display: inline-flex;
    gap: 12px;
    align-items: center;
    color: var(--color-ink);
    text-decoration: none;
}

.brand-mark {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    color: white;
    background: var(--color-accent);
    font-family: "Songti SC", "SimSun", serif;
    font-size: 21px;
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    letter-spacing: 0.06em;
}

.brand small {
    color: var(--color-muted);
    font-size: 11px;
    letter-spacing: 0.12em;
}

.nav-actions {
    display: flex;
    gap: 20px;
    font-size: 14px;
}

main {
    width: min(calc(100% - 40px), var(--max-width));
    margin: 42px auto 72px;
}

main > header {
    margin-bottom: 30px;
    padding-bottom: 28px;
    border-bottom: 2px solid var(--color-ink);
}

h1,
h2,
h3 {
    margin-top: 0;
    font-family: "Songti SC", "STSong", "SimSun", serif;
    line-height: 1.22;
    letter-spacing: -0.015em;
}

h1 {
    margin-bottom: 12px;
    font-size: clamp(32px, 5vw, 58px);
    font-weight: 600;
}

h2 {
    font-size: clamp(22px, 3vw, 30px);
}

h3 {
    font-size: 20px;
}

.eyebrow,
main > header > p:first-child {
    margin-bottom: 10px;
    color: var(--color-accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.muted,
.security-note {
    color: var(--color-muted);
}

section,
article {
    margin: 0 0 24px;
    padding: 28px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: var(--color-surface);
    box-shadow: var(--shadow-soft);
}

article {
    box-shadow: none;
}

dl {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1px;
    overflow: hidden;
    padding: 1px;
    background: var(--color-line);
}

dl > div {
    padding: 18px;
    background: var(--color-surface);
}

dt {
    color: var(--color-muted);
    font-size: 12px;
}

dd {
    margin: 5px 0 0;
    font-size: 26px;
    font-weight: 650;
}

form {
    display: grid;
    gap: 16px;
}

label {
    display: grid;
    gap: 7px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 600;
}

input,
select,
textarea,
button {
    min-height: 44px;
    border: 1px solid #bcb3a9;
    border-radius: 4px;
    font: inherit;
}

input,
select,
textarea {
    width: 100%;
    padding: 9px 12px;
    color: var(--color-ink);
    background: #fff;
}

textarea {
    min-height: 96px;
    resize: vertical;
}

button,
.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    padding: 10px 18px;
    border-color: var(--color-accent);
    color: white;
    background: var(--color-accent);
    font-weight: 650;
    text-decoration: none;
    cursor: pointer;
    transition: background 160ms ease, transform 160ms ease;
}

button:hover,
.button-link:hover {
    color: white;
    background: var(--color-accent-dark);
    transform: translateY(-1px);
}

:focus-visible {
    outline: 3px solid rgba(141, 48, 43, 0.3);
    outline-offset: 3px;
}

.alert {
    padding: 12px 14px;
    border-left: 4px solid var(--color-accent);
    color: var(--color-accent-dark);
    background: var(--color-accent-soft);
}

.login-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(340px, 0.7fr);
    gap: 44px;
    align-items: stretch;
    min-height: 620px;
}

.login-intro,
.login-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin: 0;
}

.login-intro {
    padding: clamp(36px, 7vw, 84px);
    color: white;
    background: var(--color-ink);
}

.login-intro h1 {
    font-size: clamp(44px, 7vw, 82px);
}

.login-intro .eyebrow,
.login-intro p {
    color: #e4dcd2;
}

.intro-benefits {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    overflow: hidden;
    margin-top: 36px;
    padding: 1px;
    color: var(--color-ink);
    background: var(--color-line);
}

.intro-benefits article {
    margin: 0;
    padding: 24px;
    border: 0;
    border-radius: 0;
    background: var(--color-surface);
    box-shadow: none;
}

.benefit-title {
    margin: 0;
    color: var(--color-ink);
    font-size: clamp(22px, 2.2vw, 28px);
}

.login-intro .benefit-description {
    margin: 10px 0 0;
    color: #5f5953;
    font-size: 14px;
    line-height: 1.65;
}

.login-card {
    padding: clamp(30px, 5vw, 60px);
}

.security-note {
    margin-top: 24px;
    font-size: 12px;
}

.narrow-shell {
    max-width: 720px;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

caption {
    padding: 0 0 12px;
    color: var(--color-muted);
    font-weight: 650;
    text-align: left;
}

th,
td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--color-line);
    text-align: left;
    vertical-align: top;
}

th {
    color: var(--color-muted);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

td form {
    display: inline-flex;
    margin: 0 8px 6px 0;
}

td button {
    min-height: 34px;
    padding: 5px 10px;
    font-size: 12px;
}

pre {
    overflow-x: auto;
    padding: 18px;
    border-left: 4px solid var(--color-accent);
    background: #292725;
    color: #f6efe8;
    line-height: 1.5;
}

code {
    font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
    font-size: 0.92em;
}

.site-footer {
    padding: 24px 20px 40px;
    border-top: 1px solid var(--color-line);
    color: var(--color-muted);
    font-size: 12px;
    text-align: center;
}

@media (max-width: 820px) {
    .login-shell {
        grid-template-columns: minmax(0, 1fr);
        gap: 20px;
        min-height: auto;
    }

    .login-intro {
        min-height: 420px;
    }

    .nav-actions {
        gap: 12px;
    }

    section,
    article {
        padding: 20px;
    }
}

@media (max-width: 540px) {
    .site-nav,
    main {
        width: min(calc(100% - 24px), var(--max-width));
    }

    .brand small {
        display: none;
    }

    .login-intro {
        min-height: 340px;
        padding: 28px;
    }

    .login-card {
        padding: 24px 20px;
    }

    .intro-benefits {
        grid-template-columns: minmax(0, 1fr);
    }

    h1 {
        font-size: 34px;
    }

    th,
    td {
        white-space: nowrap;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}