:root {
    --bg: #06080d;
    --bg-alt: #0a0f16;
    --surface: rgba(16, 20, 28, 0.9);
    --surface-strong: rgba(19, 24, 34, 0.96);
    --surface-soft: rgba(22, 28, 39, 0.82);
    --line: rgba(255, 255, 255, 0.1);
    --line-strong: rgba(255, 255, 255, 0.18);
    --ink: #f5f7fb;
    --muted: #a5afc3;
    --muted-strong: #cad3e4;
    --brand: #d26b3f;
    --brand-deep: #a24b28;
    --green: #2fb96f;
    --blue: #2f75ff;
    --success: #63d48e;
    --error: #ff8f7a;
    --danger: #b5362b;
    --shadow: 0 24px 64px rgba(0, 0, 0, 0.42);
    --radius-xl: 28px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(47, 117, 255, 0.14), transparent 28%),
        radial-gradient(circle at bottom right, rgba(210, 107, 63, 0.14), transparent 24%),
        linear-gradient(180deg, #05070b 0%, #090d13 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
textarea {
    font: inherit;
}

.page-shell {
    padding: 24px;
}

.layout {
    width: min(1120px, 100%);
    margin: 0 auto;
    display: grid;
    gap: 24px;
}

.layout-public-single {
    width: min(780px, 100%);
    min-height: calc(100vh - 48px);
    align-content: start;
}

.layout-admin,
.layout-auth {
    grid-template-columns: 1fr;
}

.hero-card,
.form-card,
.table-card {
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-xl);
    padding: 28px;
}

.hero-card {
    position: relative;
    overflow: hidden;
}

.hero-card::after {
    content: "";
    position: absolute;
    inset: auto -80px -80px auto;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(47, 117, 255, 0.16), rgba(47, 117, 255, 0));
    pointer-events: none;
}

.page-title-block {
    display: grid;
    gap: 18px;
    padding-top: 8px;
}

.page-title-block h1,
.section-header h1,
.section-header h2 {
    margin: 0;
    line-height: 1.08;
}

.page-title-block h1 {
    text-align: center;
    font-size: clamp(34px, 5vw, 56px);
    color: #ffffff;
    letter-spacing: 0.08em;
}

.section-header {
    display: grid;
    gap: 10px;
}

.section-header h1,
.section-header h2 {
    font-size: clamp(26px, 3vw, 38px);
}

.section-header p,
.toolbar-copy,
.submission-note,
.empty-state,
.announcement-body {
    color: var(--muted);
    line-height: 1.75;
}

.announcement-card {
    min-height: 96px;
    padding: 18px 20px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(19, 24, 34, 0.95), rgba(13, 18, 26, 0.92));
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.announcement-label {
    margin-bottom: 8px;
    color: var(--muted-strong);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.announcement-body {
    color: #eef2fa;
    white-space: pre-wrap;
}

.upload-form,
.admin-form,
.admin-settings-form {
    display: grid;
    gap: 18px;
}

.field {
    display: grid;
    gap: 10px;
}

.field span {
    font-weight: 700;
    color: #f7f9ff;
}

.field input,
.field textarea {
    width: 100%;
    padding: 14px 16px;
    color: var(--ink);
    background: var(--surface-strong);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.field input::placeholder,
.field textarea::placeholder {
    color: #7d889d;
}

.field input:focus,
.field textarea:focus {
    border-color: rgba(47, 117, 255, 0.58);
    box-shadow: 0 0 0 4px rgba(47, 117, 255, 0.16);
    background: rgba(22, 29, 41, 0.98);
}

.field input[type="file"] {
    padding: 16px;
    border: 1px dashed rgba(47, 117, 255, 0.35);
    background: linear-gradient(135deg, rgba(47, 185, 111, 0.12), rgba(47, 117, 255, 0.14));
}

.field small {
    color: var(--muted);
}

.notice-panel {
    padding: 16px 18px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(210, 107, 63, 0.12), rgba(47, 117, 255, 0.12));
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #dce4f3;
    line-height: 1.8;
}

.primary-button,
.secondary-button,
.ghost-button,
.danger-button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    padding: 0 18px;
    border: 1px solid transparent;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 700;
    transition: transform 0.18s ease, opacity 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.primary-button {
    color: #fff;
    background: linear-gradient(135deg, var(--brand), var(--brand-deep));
    box-shadow: 0 14px 28px rgba(162, 75, 40, 0.28);
}

.secondary-button {
    color: #dff4eb;
    background: rgba(47, 185, 111, 0.14);
    border-color: rgba(47, 185, 111, 0.24);
}

.ghost-button {
    color: #eef3ff;
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.12);
}

.danger-button {
    color: #fff;
    background: linear-gradient(135deg, #b5362b, #7d211a);
    box-shadow: 0 14px 28px rgba(125, 33, 26, 0.24);
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover,
.danger-button:hover {
    transform: translateY(-1px);
    opacity: 0.98;
}

.alert {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.alert-success {
    background: rgba(47, 185, 111, 0.12);
    color: var(--success);
}

.alert-error {
    background: rgba(181, 54, 43, 0.14);
    color: var(--error);
}

.admin-hero {
    display: grid;
    gap: 22px;
}

.admin-actions,
.stats-grid,
.toolbar-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.stat-card {
    min-width: 170px;
    padding: 18px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: grid;
    gap: 8px;
}

.stat-card span,
.meta-grid span {
    color: var(--muted);
    font-size: 13px;
}

.stat-card strong,
.meta-grid strong {
    color: #ffffff;
    font-size: 22px;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.submission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.submission-card {
    position: relative;
    display: grid;
    gap: 16px;
    padding: 20px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.check-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(47, 117, 255, 0.12);
    border: 1px solid rgba(47, 117, 255, 0.18);
    font-weight: 700;
}

.check-badge input {
    accent-color: var(--brand);
}

.submission-topline {
    display: grid;
    gap: 6px;
    padding-right: 92px;
}

.submission-topline h2 {
    margin: 0;
    font-size: 24px;
}

.submission-topline span,
.submission-title {
    color: var(--muted);
}

.submission-title {
    font-size: 16px;
    word-break: break-all;
}

.meta-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    padding: 14px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.meta-grid div {
    display: grid;
    gap: 6px;
}

.submission-note,
.empty-state {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    word-break: break-word;
}

.auth-card {
    max-width: 520px;
    margin: 10vh auto 0;
}

@media (max-width: 900px) {
    .page-shell {
        padding: 16px;
    }

    .layout-public-single {
        min-height: auto;
    }

    .hero-card,
    .form-card,
    .table-card {
        padding: 22px;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-buttons {
        width: 100%;
    }

    .toolbar-buttons > * {
        flex: 1 1 180px;
    }
}

@media (max-width: 560px) {
    .page-title-block h1,
    .section-header h1,
    .section-header h2 {
        font-size: 30px;
    }

    .meta-grid {
        grid-template-columns: 1fr;
    }

    .submission-topline {
        padding-right: 0;
        padding-top: 50px;
    }

    .check-badge {
        left: 16px;
        right: auto;
    }
}