/* 
 * Core Design System 
 * Aesthetic: Writer / Author / Clean / Minimal
 */

:root {
    /* Light Mode (Cream / Warm) */
    --bg-color: #FAFAFA;
    --surface-color: #FFFFFF;
    --text-primary: #2C2C2C;
    --text-secondary: #5F6368;
    --border-color: #E5E5E5;
    --primary-color: #1A1A1A;
    --primary-hover: #333333;
    --accent-color: #8B5E3C;
    /* Warm brown/sepia tone */
    --danger-color: #D32F2F;
    --danger-bg: #FDE0E0;

    /* Typography */
    --font-ui: 'Inter', system-ui, sans-serif;
    --font-serif: 'Lora', Georgia, serif;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);

    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
    /* Dark Mode (Deep Slate / Reading focused) */
    --bg-color: #121212;
    --surface-color: #1E1E1E;
    --text-primary: #E0E0E0;
    --text-secondary: #AAAAAA;
    --border-color: #333333;
    --primary-color: #FFFFFF;
    --primary-hover: #CCCCCC;
    --accent-color: #D4A373;
    --danger-color: #FF5252;
    --danger-bg: #3B1C1C;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-ui);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-color);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.5em;
    color: var(--text-primary);
}

.serif-title {
    font-family: var(--font-serif);
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

/* Form Controls */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-ui);
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(139, 94, 60, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--bg-color);
    /* Inverts color for contrast */
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: var(--bg-color);
}

.btn-block {
    display: block;
    width: 100%;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-danger {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border: 1px solid rgba(211, 47, 47, 0.2);
}

/* Layouts: Login Page */
.login-bg {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--bg-color);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}

.login-card {
    background-color: var(--surface-color);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Layouts: Admin General */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 300px;
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.admin-sidebar .brand {
    font-size: 1.5rem;
    font-family: var(--font-serif);
    font-weight: 600;
    margin-bottom: 2rem;
    display: block;
    color: var(--text-primary);
}

.admin-nav {
    list-style: none;
    flex: 1;
}

.admin-nav li {
    margin-bottom: 0.5rem;
}

.admin-nav a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.admin-nav a:hover,
.admin-nav a.active {
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.admin-content {
    flex: 1;
    padding: 2.5rem;
    overflow-y: auto;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Content styles */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.stat-card h3 {
    font-family: var(--font-ui);
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Responsive Media Queries */
@media (max-width: 768px) {

    /* Admin Layout Adjustments */
    .admin-layout {
        flex-direction: column;
    }

    .admin-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 1rem;
    }

    .admin-sidebar .brand {
        margin-bottom: 1rem;
        text-align: center;
    }

    .admin-nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .admin-nav li {
        margin-bottom: 0;
    }

    .admin-nav a {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .admin-sidebar>div:last-child {
        margin-top: 1rem;
        display: flex;
        gap: 0.5rem;
    }

    .admin-sidebar>div:last-child .btn {
        margin-bottom: 0 !important;
        flex: 1;
        padding: 0.5rem;
        font-size: 0.85rem;
    }

    .admin-content {
        padding: 1rem;
    }

    .topbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
    }

    /* Card & List Adjustments */
    .card form>div[style*="display: flex"] {
        flex-direction: column !important;
        gap: 1rem !important;
    }

    .card {
        padding: 1rem !important;
    }

    table {
        display: block;
        width: 100%;
        overflow-x: auto;
    }

    form[action*="destroy"] .btn {
        margin-top: 0.25rem;
    }
}

/* Pagination */
.pagination-nav {
    margin-top: 1rem;
}

.pagination-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    list-style: none;
    padding: 0;
    margin: 0;
    justify-content: center;
}

.pagination-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--surface-color);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.pagination-btn:hover:not(.disabled):not(.active) {
    background: var(--bg-color);
    border-color: var(--text-secondary);
}

.pagination-btn.active {
    background: var(--primary-color);
    color: var(--bg-color);
    border-color: var(--primary-color);
    font-weight: 600;
}

.pagination-btn.disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.list-pagination-jump {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem 1.25rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.list-pagination-jump__nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.list-pagination-jump__nav .pagination-nav {
    margin: 0;
}

.list-pagination-jump__form {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.list-pagination-jump__form label {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Reader toolbar & navigation */
.reader-toolbar,
.reader-nav {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.reader-toolbar__search {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 1rem;
}

.reader-toolbar__field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    min-width: 160px;
}

.reader-toolbar__field--grow {
    flex: 1;
    min-width: 220px;
}

.reader-toolbar__field label,
.reader-nav__label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    font-family: var(--font-ui);
}

.reader-toolbar__actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.reader-toolbar__meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0 0 1rem;
    font-family: var(--font-serif);
}

.reader-toolbar__pagination {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.reader-toolbar__pagination .pagination-nav {
    margin: 0;
}

.reader-nav__section + .reader-nav__section {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
}

.reader-nav__controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 0.75rem 0;
}

.reader-nav__pages {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    justify-content: center;
}

.reader-nav__page {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 0.9rem;
    text-decoration: none;
    transition: var(--transition-fast);
}

.reader-nav__page:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.reader-nav__page.is-active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--surface-color);
    font-weight: 600;
}

.reader-nav__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 0.9rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 0.9rem;
    text-decoration: none;
    transition: var(--transition-fast);
    white-space: nowrap;
    cursor: pointer;
    font-family: var(--font-ui);
}

.reader-nav__btn:hover:not(.is-disabled) {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.reader-nav__btn.is-disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.reader-nav__jump {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.reader-nav__jump label {
    color: var(--text-secondary);
    font-weight: 500;
}

.reader-nav__jump .form-control {
    min-width: 120px;
    max-width: 100%;
}

.article-list-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.article-list-item a {
    color: var(--text-primary);
    font-family: var(--font-serif);
}

.article-list-item a:hover {
    color: var(--accent-color);
}

/* Page header */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header__title {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.page-header__subtitle {
    max-width: 560px;
    margin: 0 auto;
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Books listing */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.75rem;
    margin-bottom: 2rem;
}

.book-card {
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.book-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: color-mix(in srgb, var(--accent-color) 35%, var(--border-color));
}

.book-card:hover .book-card__title {
    color: var(--accent-color);
}

.book-card:hover .book-card__cta {
    color: var(--accent-color);
}

.book-card__cover-wrap {
    position: relative;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.book-card__cover {
    display: block;
    width: 100%;
    aspect-ratio: 2 / 3;
    object-fit: cover;
}

.book-card__cover--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
    color: var(--text-secondary);
    font-family: var(--font-serif);
    font-size: 0.95rem;
}

.book-card__badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface-color) 92%, transparent);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    backdrop-filter: blur(4px);
}

.book-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 1.25rem 1.35rem 1.35rem;
    gap: 0.5rem;
}

.book-card__title {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    line-height: 1.35;
    margin: 0;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.book-card__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.book-card__meta-sep {
    opacity: 0.6;
}

.book-card__desc {
    margin: 0.25rem 0 0;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card__cta {
    margin-top: auto;
    padding-top: 0.75rem;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.books-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem 1.5rem;
    background: var(--surface-color);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
}

.books-empty__title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    margin: 0 0 0.5rem;
    color: var(--text-primary);
}

.books-empty__hint {
    margin: 0;
    font-size: 0.95rem;
}

@media (max-width: 768px) {
    .page-header {
        margin-bottom: 2rem;
    }

    .page-header__title {
        font-size: 2rem;
    }

    .books-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .book-card__cover--placeholder {
        min-height: 220px;
    }
}

/* Content protection */
.content-protected,
.protected-content,
.article-body,
.trix-content,
.ck-content {
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

.content-protected img,
.protected-content img,
.article-body img,
.trix-content img,
.ck-content img {
    -webkit-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

/* UI Overlays — Modal & Loading */
body.ui-locked {
    overflow: hidden;
}

.ui-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.ui-overlay[hidden] {
    display: none !important;
}

.ui-loading-overlay {
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(2px);
}

.ui-loading-box {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    min-width: 220px;
}

.ui-spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 1rem;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: ui-spin 0.75s linear infinite;
}

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

.ui-loading-text {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.ui-modal-overlay {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
}

.ui-modal-box {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    max-width: 420px;
    width: 100%;
    box-shadow: var(--shadow-md);
    animation: ui-modal-in 0.2s ease;
}

@keyframes ui-modal-in {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-8px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.ui-modal-title {
    margin: 0 0 0.75rem;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.ui-modal-message {
    margin: 0 0 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

.ui-modal-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

.ui-modal-btn-cancel {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.ui-modal-btn-cancel[hidden] {
    display: none;
}