:root {
    --primary: #1a3a6c;
    --primary-soft: #eef4fb;
    --accent: #d4af37;
    --danger: #8B0000;
    --surface: #ffffff;
    --border: #d9e2ec;
    --text: #243447;
    --muted: #66788a;
    --shadow: 0 16px 40px rgba(26, 58, 108, 0.12);
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background: #f4f7fb;
    font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
}

button,
input {
    font: inherit;
}

button {
    cursor: pointer;
}

.admin-shell {
    min-height: 100vh;
}

.auth-loading {
    min-height: 100vh;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 18px;
    padding: 32px;
    text-align: center;
}

.auth-loading img {
    width: 190px;
    max-width: 70vw;
}

.auth-loading p {
    margin: 0;
    color: var(--muted);
}

.loading-mark {
    width: 34px;
    height: 34px;
    border: 3px solid #d8e2ee;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.login-panel {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(280px, 1fr) minmax(320px, 440px);
    align-items: center;
    gap: 48px;
    max-width: 1080px;
    margin: 0 auto;
    padding: 40px 24px;
}

.brand-block img {
    width: 210px;
    max-width: 100%;
    margin-bottom: 28px;
}

.brand-block h1,
.admin-header h1,
.panel h2,
.sub-heading h3 {
    margin: 0;
    color: var(--primary);
}

.brand-block h1 {
    font-size: 2.4rem;
}

.brand-block p,
.panel-heading p {
    color: var(--muted);
    margin: 10px 0 0;
    line-height: 1.7;
}

.login-card,
.account-card,
.settings-card,
.dashboard,
.progress-card,
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.login-card {
    display: grid;
    gap: 18px;
    padding: 28px;
    border-radius: 8px;
}

.login-card label,
.account-card label,
.settings-card label {
    display: grid;
    gap: 8px;
    color: var(--primary);
    font-weight: 600;
}

.login-card input,
.account-card input,
.settings-card input,
.editor-row input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 11px 12px;
    color: var(--text);
    background: #fff;
    outline: none;
}

.login-card input:focus,
.account-card input:focus,
.settings-card input:focus,
.editor-row input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 58, 108, 0.12);
}

.login-card button,
.primary-button {
    border: none;
    border-radius: 6px;
    padding: 11px 18px;
    color: #fff;
    background: var(--primary);
    font-weight: 600;
}

.account-card {
    display: grid;
    gap: 18px;
    max-width: 520px;
    padding: 22px;
    border-radius: 8px;
}

.account-card .save-row,
.account-card .form-message {
    grid-column: 1;
}

.account-user-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.account-card input[readonly] {
    background: #f3f6fa;
    color: var(--muted);
}

.settings-layout {
    display: grid;
    grid-template-columns: minmax(320px, 0.86fr) minmax(420px, 1.14fr);
    gap: 24px;
}

.settings-card {
    display: grid;
    gap: 16px;
    padding: 22px;
    border-radius: 8px;
}

.settings-card h3 {
    margin: 0;
    color: var(--primary);
}

.login-card button:hover,
.primary-button:hover {
    background: #244d86;
}

.form-message {
    min-height: 22px;
    margin: 0;
    color: var(--danger);
}

.dashboard {
    width: min(1180px, calc(100% - 32px));
    margin: 24px auto;
    border-radius: 8px;
    padding: 24px;
}

.admin-header,
.panel-heading,
.sub-heading,
.progress-meta,
.save-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.admin-header {
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.eyebrow {
    margin: 0 0 4px;
    color: var(--accent);
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.ghost-button,
.small-button,
.danger-button,
.move-button {
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    color: var(--primary);
    padding: 9px 12px;
    text-decoration: none;
}

.ghost-button:hover,
.small-button:hover,
.move-button:hover {
    background: var(--primary-soft);
}

.tabs {
    display: flex;
    gap: 8px;
    margin: 22px 0;
    border-bottom: 1px solid var(--border);
}

.tab-button {
    border: none;
    background: transparent;
    color: var(--muted);
    padding: 12px 16px;
    border-bottom: 3px solid transparent;
    font-weight: 600;
}

.tab-button.active {
    color: var(--primary);
    border-bottom-color: var(--accent);
}

.panel {
    display: none;
}

.panel.active {
    display: block;
}

.panel-heading {
    margin-bottom: 18px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 1fr));
    gap: 14px;
    margin-bottom: 16px;
}

.stat-card,
.progress-card {
    border-radius: 8px;
    padding: 18px;
}

.stat-card span {
    display: block;
    color: var(--muted);
    margin-bottom: 6px;
}

.stat-card strong {
    color: var(--primary);
    font-size: 2rem;
}

.progress-track {
    height: 14px;
    background: #e8eef6;
    border-radius: 999px;
    overflow: hidden;
    margin: 12px 0 14px;
}

.progress-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.25s ease;
}

.progress-log {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
    max-height: 180px;
    overflow: auto;
}

.progress-log li {
    margin: 6px 0;
}

.editor-table {
    display: grid;
    gap: 10px;
}

.editor-row {
    display: grid;
    grid-template-columns: 1fr 1fr auto auto auto;
    gap: 10px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px;
}

.editor-row.single {
    grid-template-columns: 1fr auto auto auto;
}

.danger-button {
    color: var(--danger);
}

.danger-button:hover {
    background: rgba(139, 0, 0, 0.06);
}

.split-layout {
    display: grid;
    grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr);
    gap: 24px;
}

.sub-heading {
    margin: 12px 0;
}

.save-row {
    justify-content: flex-end;
    margin-top: 18px;
}

.toast {
    position: fixed;
    right: 24px;
    bottom: 24px;
    max-width: min(420px, calc(100% - 48px));
    margin: 0;
    padding: 12px 16px;
    border-radius: 6px;
    background: var(--primary);
    color: #fff;
    box-shadow: var(--shadow);
}

.toast.error {
    background: var(--danger);
}

@media (max-width: 820px) {
    .login-panel,
    .split-layout,
    .settings-layout {
        grid-template-columns: 1fr;
    }

    .admin-header,
    .panel-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .editor-row,
    .editor-row.single,
    .account-user-row,
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 560px) {
    .dashboard {
        width: 100%;
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
    }

    .tabs {
        overflow-x: auto;
    }
}