/* =============================================================================
   Alexandria Press - Reader Stylesheet
   ============================================================================= */

/* ── CSS Variables ── Light (default) ─────────────────────────────────────── */
:root {
    --bg-primary:    #F7F4ED;
    --bg-secondary:  #FFFDF7;
    --bg-elevated:   #FFFFFF;
    --text-primary:  #1A1A1A;
    --text-secondary:#4A4A4A;
    --text-tertiary: #757575;
    --border:        #E0DCD3;
    --border-subtle: #EBE8E1;
    --reader-bg:     #F7F4ED;

    --font-serif:    'Lora', serif;
    --font-display:  'Lato', sans-serif;
    --font-sans:     'IBM Plex Sans', -apple-system, sans-serif;

    --space-xs:  0.25rem;
    --space-sm:  0.5rem;
    --space-md:  1rem;
    --space-lg:  1.5rem;
    --space-xl:  2rem;

    --transition-fast:   150ms ease;
    --transition-medium: 300ms ease;
}

/* ── Dark (system) ─────────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary:    #121212;
        --bg-secondary:  #181818;
        --bg-elevated:   #202020;
        --text-primary:  #F2F2F2;
        --text-secondary:#A0A0A0;
        --text-tertiary: #707070;
        --border:        #2A2A2A;
        --border-subtle: #1F1F1F;
        --reader-bg:     #0A0A0A;
    }
}

/* ── Explicit theme overrides (override system dark) ──────────────────────── */
[data-theme="light"] {
    --bg-primary:    #F7F4ED;
    --bg-secondary:  #FFFDF7;
    --bg-elevated:   #FFFFFF;
    --text-primary:  #1A1A1A;
    --text-secondary:#4A4A4A;
    --text-tertiary: #757575;
    --border:        #E0DCD3;
    --border-subtle: #EBE8E1;
    --reader-bg:     #F7F4ED;
}

[data-theme="sepia"] {
    --bg-primary:    #f5e6c8;
    --bg-secondary:  #ede0c4;
    --bg-elevated:   #f8efd8;
    --text-primary:  #3b2a1a;
    --text-secondary:#5a3e28;
    --text-tertiary: #7a6040;
    --border:        #c8a87a;
    --border-subtle: #d4b88a;
    --reader-bg:     #ede0c4;
}

[data-theme="dark"] {
    --bg-primary:    #121212;
    --bg-secondary:  #181818;
    --bg-elevated:   #202020;
    --text-primary:  #F2F2F2;
    --text-secondary:#A0A0A0;
    --text-tertiary: #707070;
    --border:        #2A2A2A;
    --border-subtle: #1F1F1F;
    --reader-bg:     #0A0A0A;
}

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--reader-bg);
    font-family: var(--font-sans);
    color: var(--text-primary);
}

/* ── Toolbar ───────────────────────────────────────────────────────────────── */
.reader-toolbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 72px;
    background: transparent;
    display: flex;
    align-items: center;
    z-index: 10000;
    transition: transform 0.3s ease;
}

.reader-toolbar-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-md) var(--space-xl);
}

/* ── Toolbar left / right ──────────────────────────────────────────────────── */
.toolbar-left {
    display: flex;
    align-items: center;
    min-width: 0;
    flex: 1;
    overflow: hidden;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.nav-book-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-left: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0.8;
    max-width: 200px;
}

.toolbar-sep {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin: 0 8px;
    flex-shrink: 0;
    visibility: hidden;
}

.nav-chapter-name {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 260px;
}

@media (max-width: 768px) {
    .toolbar-sep,
    .nav-chapter-name {
        display: none;
    }
    .nav-book-title {
        max-width: 140px;
        font-size: 0.875rem;
    }
    .reader-page-info {
        display: none;
    }
    .reader-toolbar-controls {
        padding: var(--space-md);
    }
}

/* ── Toolbar buttons ───────────────────────────────────────────────────────── */
.reader-tool-btn,
.nav-btn-back {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    height: 44px;
    padding: 0 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 150ms ease;
    text-decoration: none;
    border-radius: 6px;
}

.reader-tool-btn:hover:not(:disabled),
.nav-btn-back:hover {
    color: var(--text-primary);
    background: rgba(128,128,128,0.1);
}

.reader-tool-btn.icon-only {
    width: 44px;
    padding: 0;
}

.reader-tool-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.reader-settings-btn {
    font-family: var(--font-serif);
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    width: auto;
    padding: 0 12px;
}

.reader-settings-btn[aria-expanded="true"] {
    background: rgba(128,128,128,0.15);
    color: var(--text-primary);
}

/* ── Pagination ────────────────────────────────────────────────────────────── */
.reader-pagination {
    display: flex;
    align-items: center;
    gap: 4px;
}

.reader-page-info {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-tertiary);
    min-width: 48px;
    text-align: center;
}

/* ── Viewer ────────────────────────────────────────────────────────────────── */
#viewer {
    position: absolute;
    top: 72px;
    left: 0;
    width: 100vw;
    height: calc(100vh - 72px);
    background: var(--reader-bg);
    overflow: hidden;
    transition: top 0.3s ease, height 0.3s ease;
}

/* ── Fullscreen ────────────────────────────────────────────────────────────── */
body.reader-fullscreen .reader-toolbar {
    transform: translateY(-100%);
}

body.reader-fullscreen #viewer {
    top: 0;
    height: 100vh;
}

.fullscreen-hint {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: rgba(0, 0, 0, 0.65);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    padding: 8px 18px;
    border-radius: 20px;
    opacity: 0;
    pointer-events: none;
    z-index: 30000;
    transition: opacity 0.3s ease, transform 0.3s ease;
    cursor: pointer;
    white-space: nowrap;
}

.fullscreen-hint.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

/* Keep hint permanently visible (dimmed) while in fullscreen */
body.reader-fullscreen .fullscreen-hint {
    opacity: 0.35;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

body.reader-fullscreen .fullscreen-hint:hover {
    opacity: 0.85;
}

/* ── Paper Texture ─────────────────────────────────────────────────────────── */
.texture-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 20000;
    opacity: 0.3;
    mix-blend-mode: multiply;
}

[data-theme="dark"] .texture-overlay {
    mix-blend-mode: soft-light;
    opacity: 0.15;
}

/* ── Loader ────────────────────────────────────────────────────────────────── */
.reader-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-tertiary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    z-index: 5000;
}

/* ── Settings Panel ────────────────────────────────────────────────────────── */
.settings-panel {
    position: fixed;
    top: 72px;
    right: 16px;
    width: 300px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
    z-index: 12000;
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    overflow-x: hidden;
}

.settings-panel.panel-open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

/* Mobile: bottom sheet */
@media (max-width: 768px) {
    .settings-panel {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        border-radius: 16px 16px 0 0;
        border-bottom: none;
        transform: translateY(100%);
        max-height: 75vh;
        transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
        box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.2);
    }

    .settings-panel.panel-open {
        transform: translateY(0);
        opacity: 1;
    }

    /* Drag handle */
    .settings-panel::before {
        content: '';
        display: block;
        width: 36px;
        height: 4px;
        background: var(--border);
        border-radius: 2px;
        margin: 12px auto 4px;
    }
}

/* Panel backdrop */
.panel-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 11999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

@media (max-width: 768px) {
    .panel-backdrop {
        display: block;
    }
    .panel-backdrop.panel-open {
        opacity: 1;
        pointer-events: auto;
    }
}

/* Panel sections */
.panel-section {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.panel-section:last-child {
    border-bottom: none;
}

/* Chapter name row (mobile only) */
.panel-chapter-row {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
    min-height: 44px;
    display: flex;
    align-items: center;
}

.panel-chapter-name {
    font-family: var(--font-serif);
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.3;
}

@media (min-width: 769px) {
    .panel-chapter-row {
        display: none;
    }
}

/* ── Panel search ──────────────────────────────────────────────────────────── */
.panel-search-bar {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0 10px;
    gap: 8px;
}

.panel-search-icon {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.panel-search-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    padding: 9px 0;
    min-width: 0;
}

.panel-search-input::placeholder {
    color: var(--text-tertiary);
}

.panel-search-input::-webkit-search-cancel-button {
    display: none;
}

.panel-search-clear {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    padding: 0;
    display: none;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.panel-search-clear:hover {
    color: var(--text-primary);
}

/* Search results */
.book-search-results {
    max-height: 220px;
    overflow-y: auto;
    margin-top: 6px;
}

.search-results-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.search-result-item {
    padding: 8px 10px;
    cursor: pointer;
    border-radius: 6px;
    margin-bottom: 2px;
    display: flex;
    flex-direction: column;
    gap: 3px;
    transition: background 0.1s ease;
}

.search-result-item:hover {
    background: var(--bg-secondary);
}

.srch-chapter {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-tertiary);
}

.srch-excerpt {
    font-family: var(--font-serif);
    font-size: 0.8375rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

.srch-excerpt mark {
    background: rgba(212, 175, 55, 0.35);
    color: inherit;
    border-radius: 2px;
    padding: 0 1px;
}

.search-status {
    padding: 12px 10px;
    text-align: center;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* ── Font size row ─────────────────────────────────────────────────────────── */
.panel-font-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.font-adj-btn {
    font-family: var(--font-serif);
    font-size: 0.875rem;
    font-weight: 600;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 8px;
    padding: 7px 14px;
    line-height: 1;
    transition: all 0.15s ease;
    flex: 1;
}

.font-adj-btn--large {
    font-size: 1.0625rem;
}

.font-adj-btn:hover:not(:disabled) {
    background: var(--bg-elevated);
    border-color: var(--text-tertiary);
}

.font-adj-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.font-size-label {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    min-width: 40px;
    text-align: center;
    flex-shrink: 0;
}

/* ── Theme row ─────────────────────────────────────────────────────────────── */
.panel-theme-row {
    display: flex;
    gap: 8px;
}

.theme-btn {
    flex: 1;
    padding: 8px 4px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

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

.theme-btn.active {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

/* ── Fullscreen button ─────────────────────────────────────────────────────── */
.panel-action-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.panel-action-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

/* ── Copy popover ──────────────────────────────────────────────────────────── */
.copy-popover {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    z-index: 25000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.copy-popover.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 10px 18px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    border-radius: 10px;
    transition: background 0.15s ease;
}

.copy-btn:hover {
    background: var(--bg-secondary);
}

/* ── Utilities ─────────────────────────────────────────────────────────────── */
.hidden {
    display: none !important;
}

/* ── TOC Overlay ───────────────────────────────────────────────────────────── */
.contents-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 13000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    animation: fadeIn 0.2s ease;
}

.contents-menu {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    border-radius: 4px;
}

.contents-menu-header {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.contents-menu-header h2 {
    font-size: 1.25rem;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.contents-close {
    font-size: 2rem;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
}

.contents-close:hover {
    color: var(--text-primary);
}

.contents-menu-links {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl);
}

.menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu-list li {
    margin-bottom: 0.5rem;
}

.menu-list a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.menu-list a:hover {
    background: var(--bg-secondary);
    padding-left: 1.25rem;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}