/* ==========================================================================
   📖 STORY TO CARD READER - CORE LAYOUT, HERO & BOOK PAGE FLIP
   1:1 Pixel-Perfect Replica from Android Native MainActivityStoryReader.kt
   Separated according to SRP (< 350 lines/file rule)
   ========================================================================== */

#screenStoryReader {
    background-color: var(--m3-screen-bg) !important;
    color: var(--m3-on-surface);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    touch-action: pan-y;
    user-select: none;
    -webkit-user-select: none;
}

.story-book-shell {
    perspective: 1200px;
    -webkit-perspective: 1200px;
    width: 100%;
    min-height: 100%;
}

.story-flip-page {
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    transition: transform 0.28s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.24s ease;
    will-change: transform, opacity;
}

.story-flip-page.flip-out-left { transform: rotateY(-36deg) translateX(-18px); opacity: 0.2; }
.story-flip-page.flip-out-right { transform: rotateY(36deg) translateX(18px); opacity: 0.2; }
.story-flip-page.flip-in-right { animation: flipInFromRight 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards; }
.story-flip-page.flip-in-left { animation: flipInFromLeft 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards; }

@keyframes flipInFromRight {
    from { transform: rotateY(32deg) translateX(20px); opacity: 0.3; }
    to { transform: rotateY(0deg) translateX(0); opacity: 1; }
}

@keyframes flipInFromLeft {
    from { transform: rotateY(-32deg) translateX(-20px); opacity: 0.3; }
    to { transform: rotateY(0deg) translateX(0); opacity: 1; }
}

/* Dedicated Top Tabbar (Placed above Hero Image — Auto-collapses after idle, reveals on scroll to top) */
.story-hero-header {
    position: relative; z-index: 30;
    width: 100%; flex-shrink: 0;
    max-height: 58px;
    padding: 10px 14px;
    background: var(--m3-screen-bg);
    border-bottom: 1px solid var(--m3-outline-variant);
    display: flex; align-items: center; justify-content: space-between; gap: 8px;
    pointer-events: auto; overflow: hidden;
    transition: max-height 0.34s cubic-bezier(0.22, 1, 0.36, 1),
                padding 0.34s cubic-bezier(0.22, 1, 0.36, 1),
                opacity 0.26s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.34s cubic-bezier(0.22, 1, 0.36, 1),
                border-color 0.26s ease;
}
.story-hero-header.story-header-auto-hidden {
    max-height: 0 !important;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
    opacity: 0 !important;
    border-bottom-color: transparent !important;
    transform: translateY(-14px) !important;
    pointer-events: none !important;
}
.story-hero-header.story-header-auto-hidden * {
    pointer-events: none !important;
}

.story-hero-btn {
    pointer-events: auto; width: 36px; height: 36px; border-radius: 9999px;
    background: var(--m3-surface-container-high);
    border: 1px solid var(--m3-outline-variant);
    display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0;
    transition: transform 0.15s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.story-hero-btn:hover { background: var(--m3-surface-container-highest); border-color: var(--m3-primary); }
.story-hero-btn:active { transform: scale(0.92); }
.story-hero-btn svg { color: var(--m3-on-surface) !important; }

/* Hero Image Frame (Placed cleanly below Top Tabbar — Zero Overlap) */
.story-hero-frame {
    position: relative; width: 100%;
    aspect-ratio: 16 / 9.3; height: auto; min-height: 220px; max-height: 252px;
    overflow: hidden; cursor: default;
    background: var(--m3-surface-container-lowest);
}

.story-hero-image {
    width: 100%; height: 100%; object-fit: cover;
    object-position: var(--hero-focus, center 50%); display: block;
    filter: contrast(1.04) saturate(1.08);
    transform: translate3d(0, var(--hero-parallax, 0px), 0) scale(1.005);
    transition: opacity 0.38s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1), object-position 0.4s ease;
    will-change: transform, opacity;
}
.story-hero-frame.ken-burns-active .story-hero-image {
    animation: storyHeroKenBurns 14s ease-in-out infinite alternate;
}
.story-hero-image.hero-crossfade {
    animation: storyHeroCrossfadeIn 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes storyHeroKenBurns {
    0% { transform: translate3d(0, var(--hero-parallax, 0px), 0) scale(1.005); }
    100% { transform: translate3d(-1.2%, calc(var(--hero-parallax, 0px) - 3px), 0) scale(1.055); }
}
@keyframes storyHeroCrossfadeIn {
    from { opacity: 0.25; transform: translate3d(0, 5px, 0) scale(1.035); }
    to { opacity: 1; transform: translate3d(0, var(--hero-parallax, 0px), 0) scale(1.005); }
}

/* Subtle bottom blend vignette only (Top of image is 100% unobstructed) */
.story-hero-vignette {
    position: absolute; inset: 0; pointer-events: none;
    background: linear-gradient(180deg, rgba(10, 12, 8, 0) 86%, var(--m3-surface) 100%);
}

/* Inline Soft Tonal Tools (Speaker, Translate & Flashcards - Unified 32px Tonal Pills) */
.story-inline-tools { display: inline-flex; align-items: center; gap: 6px; flex-shrink: 0; }
.story-inline-tool-btn {
    width: 32px; height: 32px; border-radius: 9999px;
    border: 1px solid rgba(196, 200, 182, 0.52);
    background: var(--m3-surface-container-high);
    color: var(--m3-on-surface-variant); display: inline-flex; align-items: center; justify-content: center;
    cursor: pointer; transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.15s ease;
}
.story-inline-tool-btn:hover { background: var(--m3-surface-container-highest); color: var(--m3-on-surface); }
.story-inline-tool-btn:active { transform: scale(0.92); }
.story-inline-tool-btn.audio-playing,
.story-inline-tool-btn.active-trans {
    background: rgba(82, 102, 0, 0.13);
    border-color: rgba(82, 102, 0, 0.34);
    color: var(--m3-primary);
}
.story-inline-tool-btn.audio-playing svg { color: var(--m3-primary) !important; animation: speakerPulse 1s infinite alternate ease-in-out; }
@keyframes speakerPulse { 0% { transform: scale(1); } 100% { transform: scale(1.16); } }

/* Overlapping Literary Reading Sheet (M3 Surface Hierarchy - Subtle 18px Overlap) */
.story-text-card {
    position: relative;
    margin-top: -18px;
    border-top-left-radius: 26px;
    border-top-right-radius: 26px;
    background: var(--m3-surface) !important;
    border-top: 1px solid var(--m3-outline-variant);
    padding: 16px 24px 120px 24px;
    min-height: calc(100vh - 230px);
    z-index: 15;
}

.story-sheet-handle {
    width: 36px; height: 4px;
    border-radius: 9999px;
    background: var(--m3-outline-variant);
    margin: 0 auto 12px auto;
}

/* Editorial Chapter Bar (Apple Books Style: 01 · Title + Interactive Chapter Dots) */
.story-progress-row {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; margin-bottom: 14px; padding: 0 2px 12px 2px;
    border-bottom: 1px solid rgba(196, 200, 182, 0.38); background: transparent;
}
.story-progress-stepper { display: flex; flex-direction: column; align-items: flex-start; gap: 5px; flex: 1; min-width: 0; }
.story-editorial-title-row { display: inline-flex; align-items: baseline; gap: 6px; min-width: 0; max-width: 100%; }
.story-editorial-num { font-family: ui-sans-serif, system-ui, -apple-system, sans-serif; font-size: 12px; font-weight: 800; letter-spacing: 0.06em; color: var(--m3-primary); flex-shrink: 0; }
.story-editorial-sep { font-size: 14px; font-weight: 700; color: var(--m3-outline); flex-shrink: 0; }
.story-editorial-name { font-family: 'EB Garamond', 'Cormorant Garamond', Georgia, serif; font-size: 21px; font-weight: 700; line-height: 1.1; color: var(--m3-on-surface); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.story-editorial-done-check { display: inline-flex; align-items: center; justify-content: center; width: 16px; height: 16px; border-radius: 9999px; background: rgba(82, 102, 0, 0.14); color: var(--m3-primary); flex-shrink: 0; transform: translateY(1px); }
.story-editorial-dots { display: inline-flex; align-items: center; gap: 5px; }
.story-editorial-dot-btn { padding: 4px 1px; background: transparent; border: none; cursor: pointer; display: inline-flex; align-items: center; }
.story-editorial-dot { height: 4.5px; width: 8px; border-radius: 9999px; background: rgba(117, 120, 106, 0.28); transition: width 0.3s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.25s ease; }
.story-editorial-dot-btn.is-completed .story-editorial-dot { width: 12px; background: rgba(82, 102, 0, 0.48); }
.story-editorial-dot-btn.is-active .story-editorial-dot { width: 28px; background: var(--m3-primary); }
.story-part-title-wrap { display: none; }

.story-paragraph-text {
    font-family: 'EB Garamond', 'Cormorant Garamond', Georgia, serif;
    color: var(--m3-on-surface) !important;
    font-size: 18.5px;
    line-height: 1.85;
    white-space: pre-line;
    word-break: break-word;
    user-select: none;
    -webkit-user-select: none;
    touch-action: pan-y;
}
.story-paragraph-text.is-karaoke-reading [data-char-start] {
    opacity: 0.62;
    transition: opacity 0.15s ease, background-color 0.14s ease, color 0.14s ease, box-shadow 0.14s ease;
}
.story-paragraph-text.is-karaoke-reading .is-karaoke-past {
    opacity: 0.96;
    color: var(--m3-on-surface) !important;
}
.story-paragraph-text.is-karaoke-reading .is-karaoke-active {
    opacity: 1 !important;
    background: var(--m3-amber-container) !important;
    color: var(--m3-amber-text) !important;
    border-radius: 5px;
    box-shadow: 0 0 0 2.5px var(--m3-amber-container), 0 2px 0 0 var(--m3-amber-glow);
}

.story-translation-box {
    font-family: 'EB Garamond', 'Cormorant Garamond', Georgia, serif;
    margin-top: 16px;
    padding: 14px 16px;
    border-left: 3px solid var(--m3-tertiary);
    border-radius: 0 16px 16px 0;
    background: var(--m3-surface-container);
    color: var(--m3-on-surface-variant) !important;
    font-size: 16px;
    line-height: 1.65;
    font-style: italic;
}

.story-translation-box.hidden { display: none !important; opacity: 0; }

/* Sticky Bottom Navigation Bar (M3 SurfaceContainerLow + Sleek 46px Primary CTA) */
.story-bottom-nav {
    position: absolute; bottom: 0; left: 0; right: 0; z-index: 40;
    padding: 12px 20px max(env(safe-area-inset-bottom), 18px) 20px;
    background: linear-gradient(to bottom, transparent 0%, var(--m3-surface) 50%, var(--m3-surface) 100%);
    pointer-events: none;
    transition: opacity 0.28s cubic-bezier(0.16, 1, 0.3, 1), transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}
.story-bottom-nav.story-bottom-nav-hidden, .story-bottom-nav.story-bottom-nav-hidden * {
    opacity: 0; transform: translateY(28px); pointer-events: none !important;
}
.story-bottom-nav-inner { max-width: 480px; margin: 0 auto; display: flex; align-items: center; gap: 12px; pointer-events: auto; }
.story-nav-btn-prev {
    flex: 0.95; height: 46px; border-radius: 9999px;
    background: var(--m3-surface-container-high) !important; border: 1px solid var(--m3-outline-variant) !important;
    color: var(--m3-on-surface) !important; display: flex; align-items: center; justify-content: center; gap: 6px;
    font-size: 13.5px; font-weight: 700; cursor: pointer;
}
.story-nav-btn-prev.disabled { opacity: 0.32 !important; pointer-events: none !important; }
.story-nav-btn-next {
    flex: 1.25; height: 46px; border-radius: 9999px;
    background: var(--m3-primary) !important; color: var(--m3-on-primary) !important;
    border: none !important;
    display: flex; align-items: center; justify-content: center; gap: 6px; font-size: 14px; font-weight: 800; cursor: pointer;
    transition: transform 0.15s ease, background-color 0.25s ease, color 0.25s ease;
}
.story-nav-btn-next.btn-locked {
    background: linear-gradient(90deg, rgba(184, 209, 102, 0.25) var(--nav-progress, 0%), var(--m3-primary-container) var(--nav-progress, 0%)) !important;
    color: var(--m3-on-primary-container) !important;
    border: 1px solid var(--m3-primary) !important;
}
.story-nav-btn-next.btn-ready {
    background: var(--m3-primary) !important;
    color: var(--m3-on-primary) !important;
}
.story-nav-btn-next:active { transform: translateY(2px); }

/* External Theme Switcher Pill (Outside Mobile Frame - M3 Tokens) */
.ext-theme-switcher-pill {
    display: inline-flex; align-items: center; gap: 8px; padding: 4px 6px 4px 12px; border-radius: 9999px;
    background: var(--m3-surface-container); border: 1px solid var(--m3-outline-variant);
}
.ext-theme-switcher-label { font-size: 10.5px; font-weight: 900; letter-spacing: 0.08em; color: var(--m3-on-surface-variant); }
.ext-theme-switcher-group { display: inline-flex; gap: 3px; padding: 2px; border-radius: 9999px; background: var(--m3-surface-container-highest); }
.ext-theme-option-btn {
    height: 28px; padding: 0 11px; border-radius: 9999px; border: none; background: transparent;
    color: var(--m3-on-surface-variant); font-size: 11.5px; font-weight: 800; display: inline-flex; align-items: center; gap: 4px; cursor: pointer; transition: all 0.2s ease;
}
.ext-theme-option-btn.active { background: var(--m3-primary); color: var(--m3-on-primary); }
html.light .story-hero-vignette { background: linear-gradient(180deg, rgba(27, 28, 23, 0.28) 0%, rgba(27, 28, 23, 0.02) 45%, rgba(254, 252, 244, 0.45) 80%, var(--m3-surface) 100%); }