/* ==========================================================================
   BookBridge design system
   Dark-only "glassy" UI foundation. North star: templates/stats.html.
   Single stylesheet — every page that extends templates/base.html loads
   this file first, then may layer page-specific CSS on top.
   ========================================================================== */

/* ============ Fonts ============ */
@font-face {
    font-family: 'Inter';
    src: url('/static/fonts/InterVariable.woff2') format('woff2');
    font-weight: 100 900;
    font-style: normal;
    font-display: swap;
}

/* ============ Design tokens ============ */
:root {
    color-scheme: dark;

    /* Surfaces */
    --bg: #0a0a0a;
    --panel: rgba(255, 255, 255, .05);
    --panel-soft: rgba(255, 255, 255, .03);
    --border: rgba(255, 255, 255, .1);
    --border-strong: rgba(255, 255, 255, .16);

    /* Text */
    --text: #fff;
    --muted: rgba(255, 255, 255, .68);
    --muted-soft: rgba(255, 255, 255, .5);

    /* Brand + status */
    --accent: #667eea;
    --accent-2: #764ba2;
    --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
    --reading: #4fc3f7;
    --listening: #9b7cff;
    --success: #36d399;
    --warning: #ffd166;
    --danger: #ff6b6b;

    /* Shape */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 18px;

    /* Elevation + focus */
    --shadow: 0 8px 24px rgba(0, 0, 0, .35);
    --focus-ring: 0 0 0 3px rgba(102, 126, 234, .4);

    /* Layout */
    --nav-height: 64px;

    /* Type */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

/* ============ Reset & base ============ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    letter-spacing: normal;
    font-feature-settings: 'cv05', 'cv11';
    background:
        radial-gradient(circle at top left, rgba(102, 126, 234, .16), transparent 32%),
        radial-gradient(circle at top right, rgba(118, 75, 162, .14), transparent 28%),
        linear-gradient(180deg, #080808 0%, #0a0a0a 55%, #0f0f14 100%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

img {
    max-width: 100%;
    display: block;
}

button {
    font-family: inherit;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: var(--radius-sm);
}

/* ============ Scrollbars ============ */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, .2) transparent;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, .14);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background-color: rgba(255, 255, 255, .24);
    background-clip: padding-box;
}

/* ============ Layout: top nav ============ */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 20px;
    min-height: var(--nav-height);
    padding: 0 24px;
    background: rgba(10, 10, 10, .8);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.logo-section {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo-section a {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.app-icon {
    display: block;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
}

.brand-wordmark {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -.01em;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-tabs {
    display: flex;
    align-items: center;
    gap: 2px;
    flex: 1;
    min-width: 0;
    overflow-x: auto;
    scrollbar-width: none;
    white-space: nowrap;
}

.nav-tabs::-webkit-scrollbar {
    display: none;
}

.nav-tab {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    margin: 0 2px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: color .15s ease, background-color .15s ease;
}

.nav-tab:hover {
    color: var(--text);
    background: rgba(255, 255, 255, .06);
}

.nav-tab.active {
    color: var(--text);
    background: rgba(255, 255, 255, .08);
}

.nav-tab.active::after {
    content: "";
    position: absolute;
    left: 10px;
    right: 10px;
    bottom: -1px;
    height: 2px;
    border-radius: 2px;
    background: var(--gradient);
}

.library-links {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-left: 16px;
    border-left: 1px solid var(--border);
    flex-shrink: 0;
}

.nav-icon-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    background: rgba(255, 255, 255, .04);
    text-decoration: none;
    flex-shrink: 0;
    transition: color .2s ease, background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.nav-icon-link:hover {
    color: var(--text);
    background: rgba(255, 255, 255, .1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, .25);
}

.nav-icon-link svg {
    width: 18px;
    height: 18px;
    stroke-width: 2;
}

.nav-icon-link img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    border-radius: 4px;
}

/* ============ User menu ============ */
.user-menu {
    position: relative;
    display: inline-flex;
    flex-shrink: 0;
    margin-left: 4px;
}

.user-menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color .15s ease, border-color .15s ease;
}

.user-menu-trigger:hover {
    background: rgba(255, 255, 255, .1);
    border-color: var(--border-strong);
}

.user-menu-caret {
    font-size: 10px;
    opacity: .7;
    transition: transform .2s ease;
}

.user-menu.open .user-menu-caret {
    transform: rotate(180deg);
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 190px;
    background: rgba(20, 20, 20, .98);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 6px;
    display: none;
    flex-direction: column;
    gap: 2px;
    z-index: 200;
}

.user-menu.open .user-menu-dropdown {
    display: flex;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease;
}

.user-menu-item:hover {
    background: rgba(255, 255, 255, .08);
    color: var(--text);
}

/* ============ Generic dropdown (Tools-style menus) ============ */
.dropdown {
    position: relative;
    display: inline-flex;
}

.dropdown-trigger {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 200px;
    background: rgba(20, 20, 20, .98);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 6px;
    display: none;
    flex-direction: column;
    gap: 2px;
    z-index: 200;
}

.dropdown.open .dropdown-menu {
    display: flex;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease;
}

.dropdown-item:hover {
    background: rgba(255, 255, 255, .08);
    color: var(--text);
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, border-color .15s ease, opacity .15s ease;
}

.btn:disabled,
.btn[disabled] {
    opacity: .5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, .3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, .4);
}

.btn-secondary {
    background: var(--panel);
    border-color: var(--border);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, .1);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--muted);
}

.btn-ghost:hover:not(:disabled) {
    background: rgba(255, 255, 255, .06);
    color: var(--text);
}

.btn-danger {
    background: rgba(255, 107, 107, .15);
    border-color: rgba(255, 107, 107, .35);
    color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background: rgba(255, 107, 107, .25);
    border-color: rgba(255, 107, 107, .5);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: 8px;
}

/* ============ Cards & panels ============ */
.card,
.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 24px;
}

/* ============ Forms ============ */
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 6px;
}

.form-group {
    margin-bottom: 16px;
}

.form-input,
.form-select,
select.form-select,
textarea.form-input,
.card input[type="text"],
.card input[type="password"],
.card input[type="number"],
.card input[type="url"],
.card input[type="email"],
.card input[type="search"],
.card select,
.card textarea,
.panel input[type="text"],
.panel input[type="password"],
.panel input[type="number"],
.panel input[type="url"],
.panel input[type="email"],
.panel input[type="search"],
.panel select,
.panel textarea {
    width: 100%;
    padding: 11px 14px;
    background: rgba(255, 255, 255, .06);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    transition: border-color .15s ease, box-shadow .15s ease, background-color .15s ease;
}

.form-input:focus,
.form-select:focus,
.card input:focus,
.card select:focus,
.card textarea:focus,
.panel input:focus,
.panel select:focus,
.panel textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: var(--focus-ring);
    background: rgba(255, 255, 255, .08);
}

.form-input::placeholder,
.card input::placeholder,
.panel input::placeholder,
.card textarea::placeholder,
.panel textarea::placeholder {
    color: var(--muted-soft);
}

textarea.form-input {
    resize: vertical;
    min-height: 100px;
}

/* ============ Toggle switch ============ */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch .slider {
    position: absolute;
    inset: 0;
    cursor: pointer;
    background-color: rgba(255, 255, 255, .12);
    border: 1px solid var(--border);
    border-radius: 999px;
    transition: background-color .25s ease, border-color .25s ease;
}

.toggle-switch .slider::before {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 2px;
    top: 2px;
    background-color: #fff;
    border-radius: 50%;
    transition: transform .25s ease;
}

.toggle-switch input:checked+.slider {
    background: var(--gradient);
    border-color: transparent;
}

.toggle-switch input:checked+.slider::before {
    transform: translateX(20px);
}

.toggle-switch input:focus-visible+.slider {
    box-shadow: var(--focus-ring);
}

/* ============ Status badges ============ */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .04em;
    white-space: nowrap;
    flex: 0 0 auto;
}

.status-active {
    background: rgba(54, 211, 153, .15);
    color: var(--success);
    border: 1px solid rgba(54, 211, 153, .3);
}

.status-processing,
.status-forging {
    background: rgba(255, 209, 102, .15);
    color: var(--warning);
    border: 1px solid rgba(255, 209, 102, .3);
    animation: bb-pulse 2s infinite;
}

.status-error {
    background: rgba(255, 107, 107, .15);
    color: var(--danger);
    border: 1px solid rgba(255, 107, 107, .3);
}

.status-inactive,
.status-completed {
    background: rgba(255, 255, 255, .08);
    color: var(--muted);
    border: 1px solid var(--border);
}

@keyframes bb-pulse {
    0% {
        opacity: .7;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: .7;
    }
}

/* ============ Progress bar ============ */
.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, .08);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar-fill {
    display: block;
    height: 100%;
    background: var(--gradient);
    border-radius: 999px;
    transition: width .5s ease;
}

/* ============ Modal ============ */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(6, 8, 14, .72);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

.modal {
    width: min(560px, 100%);
    max-height: min(85vh, 860px);
    overflow: auto;
    background: #11131b;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 70px rgba(0, 0, 0, .45);
    padding: 24px;
}

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

.table th {
    padding: 10px 14px;
    text-align: left;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--muted-soft);
    border-bottom: 1px solid var(--border);
}

.table td {
    padding: 12px 14px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
}

.table tbody tr {
    transition: background-color .15s ease;
}

.table tbody tr:hover {
    background: rgba(255, 255, 255, .03);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* ============ In-page tab strips ============ */
.tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
}

.tab {
    padding: 10px 16px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--muted);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: color .15s ease, border-color .15s ease;
}

.tab:hover {
    color: var(--text);
}

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

/* ============ Toast & flash messages ============ */
.flash-message {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    margin-bottom: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--text);
}

.flash-message.success {
    background: rgba(54, 211, 153, .1);
    border-color: rgba(54, 211, 153, .3);
    color: #8ee8bd;
}

.flash-message.error {
    background: rgba(255, 107, 107, .1);
    border-color: rgba(255, 107, 107, .3);
    color: #ffb3b3;
}

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 400;
    min-width: 260px;
    max-width: 360px;
    padding: 14px 16px;
    background: #151823;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    font-size: 14px;
    color: var(--text);
}

.toast.success {
    border-color: rgba(54, 211, 153, .4);
}

.toast.error {
    border-color: rgba(255, 107, 107, .4);
}

/* ============ Empty state ============ */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 48px 24px;
    text-align: center;
    color: var(--muted);
}

.empty-state .empty-icon {
    font-size: 40px;
    margin-bottom: 8px;
    opacity: .7;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--text);
}

.empty-state p {
    max-width: 420px;
    color: var(--muted);
    line-height: 1.6;
}

/* ============ Auth shell (login / setup centered card) ============ */
.auth-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: 400px;
}

.auth-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    text-align: center;
    margin-bottom: 28px;
}

.auth-brand .app-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.auth-brand .brand-wordmark {
    font-size: 26px;
}

.auth-brand p {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.45;
}

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

    /* Two compact rows: logo + library links + user menu on the first row,
       the tab strip full-width and swipeable on the second. */
    .top-nav {
        flex-wrap: wrap;
        min-height: auto;
        padding: 10px 12px;
        row-gap: 8px;
        column-gap: 10px;
    }

    .logo-section {
        margin-right: auto;
    }

    .nav-tabs {
        order: 5;
        flex: 1 1 100%;
        width: 100%;
    }

    .nav-tab {
        padding: 8px 12px;
    }

    .library-links {
        border-left: none;
        padding-left: 0;
        gap: 6px;
    }

    .nav-icon-link {
        width: 32px;
        height: 32px;
    }

    .user-menu-trigger {
        max-width: 140px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .card,
    .panel {
        padding: 18px;
        border-radius: var(--radius);
    }
}

@media (max-width: 420px) {

    /* Icon-only brand so the first row never overflows on small phones. */
    .brand-wordmark {
        display: none;
    }

    .library-links .nav-icon-link {
        width: 30px;
        height: 30px;
    }
}