/* ========== 澹泊台 - 高端国风样式 ========== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700;900&display=swap');

:root {
    --paper-white: #faf6f0;
    --ink-black: #1a1a1a;
    --chinese-red: #8b1a1a;
    --chinese-red-light: #c44141;
    --gold: #b8860b;
    --gold-light: #d4a745;
    --gold-pale: #f5e6c8;
    --ink-gray: #4a4a4a;
    --ink-gray-light: #8a8a8a;
    --parchment: #f5f0e6;
    --border-gold: #c9a96e;
    --shadow-soft: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --radius-card: 8px;
    --radius-lg: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Noto Serif SC', 'SimSun', 'STSong', 'Songti SC', serif;
    background-color: var(--paper-white);
    color: var(--ink-black);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========== Ink Wash Background ========== */
.ink-bg {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse at 15% 20%, rgba(184,134,11,0.04) 0%, transparent 60%),
        radial-gradient(ellipse at 85% 70%, rgba(139,26,26,0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(0,0,0,0.02) 0%, transparent 70%),
        linear-gradient(180deg, var(--paper-white) 0%, #f0ebe0 50%, var(--paper-white) 100%);
    z-index: -1;
}

/* ========== Layout ========== */
.main-container {
    display: flex;
    min-height: 100vh;
}

/* ========== Sidebar ========== */
.sidebar {
    width: 240px;
    min-width: 240px;
    background: linear-gradient(180deg, #1a1a1a 0%, #2a2218 50%, #1a1a1a 100%);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-gold);
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    z-index: 100;
    box-shadow: 2px 0 20px rgba(0,0,0,0.15);
}

.sidebar-header {
    padding: 32px 24px 24px;
    text-align: center;
    border-bottom: 1px solid rgba(201,169,110,0.3);
}

.logo-text {
    font-size: 28px;
    font-weight: 700;
    color: var(--gold-light);
    display: block;
    letter-spacing: 6px;
}

.logo-subtitle {
    font-size: 11px;
    color: rgba(212,167,69,0.6);
    display: block;
    margin-top: 6px;
    letter-spacing: 3px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 14px 28px;
    color: rgba(250,246,240,0.7);
    text-decoration: none;
    transition: var(--transition);
    font-size: 15px;
    letter-spacing: 2px;
    border-left: 3px solid transparent;
    gap: 12px;
}

.nav-item:hover {
    color: var(--gold-light);
    background: rgba(184,134,11,0.08);
    border-left-color: rgba(184,134,11,0.5);
}

.nav-item.active {
    color: var(--gold-light);
    background: rgba(184,134,11,0.12);
    border-left-color: var(--gold);
}

.nav-item i { width: 20px; text-align: center; font-size: 16px; }

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(201,169,110,0.3);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(250,246,240,0.7);
    font-size: 13px;
}

.user-avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: rgba(184,134,11,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gold-light);
}

.user-role {
    font-size: 10px;
    color: var(--gold-pale);
    opacity: 0.6;
}

.logout-btn {
    color: rgba(250,246,240,0.5);
    text-decoration: none;
    font-size: 18px;
    transition: var(--transition);
    padding: 6px;
}

.logout-btn:hover { color: var(--chinese-red-light); }

/* ========== Main Content ========== */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 40px 48px;
    min-height: 100vh;
}

/* ========== Hero Section ========== */
.hero-section {
    text-align: center;
    padding: 80px 20px 60px;
    position: relative;
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    background: linear-gradient(180deg, #2a2218 0%, #8b6914 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 16px;
    margin-bottom: 20px;
}

.hero-quote {
    font-size: 18px;
    color: var(--ink-gray);
    letter-spacing: 4px;
    margin-bottom: 12px;
}

.hero-desc {
    font-size: 14px;
    color: var(--ink-gray-light);
    max-width: 520px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 40px;
    background: linear-gradient(135deg, #8b1a1a 0%, #a83232 100%);
    color: var(--gold-pale);
    text-decoration: none;
    border-radius: 4px;
    font-size: 16px;
    letter-spacing: 3px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(139,26,26,0.3);
}

.hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(139,26,26,0.4);
    color: #fff;
}

.hero-decoration {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: -1;
}

.ink-circle {
    width: 300px; height: 300px;
    border: 1px solid rgba(184,134,11,0.1);
    border-radius: 50%;
    position: absolute;
    top: -150px; left: -150px;
}

.ink-circle.small {
    width: 200px; height: 200px;
    top: -100px; left: -100px;
    border-color: rgba(184,134,11,0.15);
}

/* ========== Section Titles ========== */
.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 32px;
}

.title-line {
    width: 60px; height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-gold), transparent);
}

.title-text {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 6px;
    color: var(--ink-black);
}

/* ========== Category Grid ========== */
.category-section { margin-bottom: 60px; }

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 28px 16px;
    background: #fff;
    border: 1px solid rgba(201,169,110,0.2);
    border-radius: var(--radius-card);
    text-decoration: none;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--border-gold);
}

.category-icon {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(184,134,11,0.1) 0%, rgba(139,26,26,0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--gold);
    margin-bottom: 12px;
}

.category-name {
    font-size: 14px;
    color: var(--ink-black);
    letter-spacing: 2px;
    font-weight: 500;
}

/* ========== Video Grid ========== */
.recent-section { margin-bottom: 40px; }

.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.video-card {
    background: #fff;
    border-radius: var(--radius-card);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
    border: 1px solid rgba(201,169,110,0.15);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.video-card-cover {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: #1a1a1a;
    overflow: hidden;
}

.video-card-cover img {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    object-fit: cover;
}

.cover-placeholder {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2a2a2a, #1a1a1a);
    color: rgba(255,255,255,0.2);
    font-size: 40px;
}

.cover-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    color: #fff;
    font-size: 36px;
}

.video-card:hover .cover-overlay { opacity: 1; }

.duration-tag {
    position: absolute;
    bottom: 8px; right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 12px;
    font-family: monospace;
}

.video-card-info {
    padding: 14px 16px;
}

.video-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-black);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--ink-gray-light);
}

/* ========== Category Nav (videos.html) ========== */
.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(201,169,110,0.2);
}

.cat-nav-item {
    padding: 8px 24px;
    border: 1px solid rgba(201,169,110,0.3);
    border-radius: 4px;
    color: var(--ink-gray);
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 2px;
    transition: var(--transition);
}

.cat-nav-item:hover {
    border-color: var(--gold);
    color: var(--gold);
}

.cat-nav-item.active {
    background: linear-gradient(135deg, #8b1a1a, #a83232);
    border-color: transparent;
    color: #fff;
}

/* ========== Login Page ========== */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    width: 100%;
    margin-left: -240px;
}

.login-card {
    background: #fff;
    padding: 60px 48px;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 40px rgba(0,0,0,0.1);
    width: 420px;
    max-width: 90vw;
    border: 1px solid rgba(201,169,110,0.2);
    position: relative;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gold), var(--chinese-red), var(--gold));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-title {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: 10px;
    color: var(--ink-black);
    margin-bottom: 12px;
}

.login-subtitle {
    font-size: 13px;
    color: var(--ink-gray-light);
    letter-spacing: 2px;
}

.login-form .form-group {
    margin-bottom: 24px;
}

.login-form label {
    display: block;
    font-size: 14px;
    color: var(--ink-gray);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(201,169,110,0.3);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    background: var(--paper-white);
    color: var(--ink-black);
    transition: var(--transition);
    outline: none;
}

.form-input:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(184,134,11,0.1);
}

.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(201,169,110,0.3);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    background: var(--paper-white);
    color: var(--ink-black);
    resize: vertical;
    outline: none;
}

.form-textarea:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(184,134,11,0.1);
}

.form-hint {
    display: block;
    font-size: 12px;
    color: var(--ink-gray-light);
    margin-top: 4px;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2218 100%);
    color: var(--gold-light);
    border: 1px solid var(--border-gold);
    border-radius: 4px;
    font-size: 16px;
    font-family: inherit;
    letter-spacing: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.btn-login:hover {
    background: linear-gradient(135deg, #2a2218 0%, #1a1a1a 100%);
    color: #fff;
}

.login-footer {
    text-align: center;
    margin-top: 32px;
    font-size: 12px;
    color: var(--ink-gray-light);
    letter-spacing: 1px;
}

.alert-error {
    background: rgba(220,53,69,0.08);
    border: 1px solid rgba(220,53,69,0.2);
    color: #842029;
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 13px;
    margin-bottom: 16px;
}

.alert-success {
    background: rgba(25,135,84,0.08);
    border: 1px solid rgba(25,135,84,0.2);
    color: #0f5132;
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 13px;
    margin-bottom: 16px;
}

/* ========== Floating Video Button ========== */
.video-float-btn {
    position: fixed;
    bottom: 40px;
    right: 40px;
    z-index: 200;
    text-decoration: none;
}

.float-btn-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 72px; height: 72px;
    background: linear-gradient(135deg, #8b1a1a 0%, #c44141 100%);
    border-radius: 50%;
    color: var(--gold-pale);
    box-shadow: 0 6px 24px rgba(139,26,26,0.35);
    transition: var(--transition);
    font-size: 20px;
    gap: 2px;
}

.float-btn-inner span {
    font-size: 10px;
    letter-spacing: 2px;
}

.video-float-btn:hover .float-btn-inner {
    transform: scale(1.08);
    box-shadow: 0 8px 30px rgba(139,26,26,0.5);
}

/* ========== Video Player Modal ========== */
#videoPlayerModal .modal-content {
    background: #1a1a1a;
    border: 1px solid rgba(201,169,110,0.3);
}

#videoPlayerModal .modal-header {
    border-bottom: 1px solid rgba(201,169,110,0.2);
    padding: 14px 20px;
}

#videoPlayerModal .modal-title {
    color: var(--gold-light);
    font-family: 'Noto Serif SC', serif;
    font-size: 16px;
    letter-spacing: 2px;
}

.video-player {
    width: 100%;
    max-height: 70vh;
    background: #000;
    outline: none;
}

/* ========== Admin Styles ========== */
.admin-page { padding: 0; }

.admin-header { margin-bottom: 36px; }

.admin-title {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--ink-black);
    margin-bottom: 20px;
}

.admin-nav-sub {
    display: flex;
    gap: 0;
    border-bottom: 2px solid rgba(201,169,110,0.2);
}

.admin-sub-item {
    padding: 10px 24px;
    color: var(--ink-gray);
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 1px;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition);
}

.admin-sub-item:hover {
    color: var(--gold);
}

.admin-sub-item.active {
    color: var(--chinese-red);
    border-bottom-color: var(--chinese-red);
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 28px 24px;
    background: #fff;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    border: 1px solid rgba(201,169,110,0.15);
}

.stat-icon {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(184,134,11,0.1), rgba(139,26,26,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--gold);
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--ink-black);
}

.stat-label {
    font-size: 13px;
    color: var(--ink-gray-light);
    letter-spacing: 1px;
}

.admin-section {
    background: #fff;
    border-radius: var(--radius-card);
    padding: 28px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-card);
    border: 1px solid rgba(201,169,110,0.15);
}

.admin-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.admin-section-title {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--ink-black);
    margin-bottom: 20px;
}

.admin-section-header .admin-section-title { margin-bottom: 0; }

.admin-form .form-group {
    margin-bottom: 20px;
}

.admin-form label {
    display: block;
    font-size: 14px;
    color: var(--ink-gray);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-group-btn {
    display: flex;
    align-items: flex-end;
}

.btn-submit {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: linear-gradient(135deg, #8b1a1a, #a83232);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    letter-spacing: 2px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-submit:hover {
    background: linear-gradient(135deg, #a83232, #c44141);
    color: #fff;
}

.btn-cancel {
    display: inline-flex;
    align-items: center;
    padding: 10px 24px;
    background: #fff;
    color: var(--ink-gray);
    border: 1px solid rgba(201,169,110,0.3);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    letter-spacing: 2px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.btn-cancel:hover { border-color: var(--gold); color: var(--gold); }

.form-actions {
    display: flex;
    gap: 16px;
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid rgba(201,169,110,0.2);
}

/* ========== Admin Table ========== */
.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--ink-gray);
    letter-spacing: 1px;
    border-bottom: 2px solid rgba(201,169,110,0.3);
}

.admin-table td {
    padding: 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid rgba(201,169,110,0.1);
    color: var(--ink-black);
}

.admin-table tr:hover td {
    background: rgba(184,134,11,0.03);
}

.empty-cell {
    text-align: center;
    color: var(--ink-gray-light) !important;
    padding: 32px !important;
}

.action-cell { white-space: nowrap; }

.btn-edit {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    color: var(--gold);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.btn-edit:hover { color: var(--gold-light); }

.btn-delete {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: none;
    border: none;
    color: #999;
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.btn-delete:hover { color: #dc3545; }

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 3px;
    font-size: 12px;
    letter-spacing: 1px;
}

.badge-admin {
    background: rgba(139,26,26,0.1);
    color: var(--chinese-red);
}

.badge-user {
    background: rgba(108,117,125,0.1);
    color: #6c757d;
}

.text-success { color: #198754; }
.text-danger { color: #dc3545; }
.text-muted { color: #aaa; }

/* ========== Permission Checkboxes ========== */
.perm-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 6px;
}

.perm-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--ink-black);
    cursor: pointer;
    font-weight: normal;
}

.perm-label input[type="checkbox"] {
    width: 16px; height: 16px;
    accent-color: var(--chinese-red);
    cursor: pointer;
}

.perm-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.perm-inline-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--ink-gray);
    cursor: pointer;
    font-weight: normal;
    white-space: nowrap;
}

.perm-inline-label input[type="checkbox"] {
    width: 14px; height: 14px;
    accent-color: var(--chinese-red);
    cursor: pointer;
}

/* ========== Empty State ========== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
    color: var(--ink-gray-light);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 16px;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.empty-hint {
    text-align: center;
    padding: 40px;
    color: var(--ink-gray-light);
    font-size: 14px;
    letter-spacing: 2px;
    grid-column: 1 / -1;
}

.btn-add-video {
    display: inline-block;
    padding: 10px 24px;
    background: linear-gradient(135deg, #8b1a1a, #a83232);
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    letter-spacing: 2px;
    font-size: 14px;
}

/* ========== Responsive ========== */
@media (max-width: 1200px) {
    .video-grid { grid-template-columns: repeat(3, 1fr); }
    .category-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
    .sidebar { width: 200px; min-width: 200px; }
    .main-content { margin-left: 200px; padding: 24px; }
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .admin-stats { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .video-grid { grid-template-columns: 1fr; }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-title { font-size: 36px; letter-spacing: 8px; }
    .login-card { padding: 40px 24px; }
}