/* ============================================
   Oracle Chronicles — Sci-fi Book Reader CSS
   Full-screen overlay, split layout:
   LEFT  → image panel with scan-lines + corner brackets
   RIGHT → typewriter text in terminal style
   ============================================ */

/* ── Design tokens ────────────────────────────────────────────────────── */
:root {
    --oc-bg:          #02040e;
    --oc-cyan:        #00d4ff;
    --oc-gold:        #ffd700;
    --oc-purple:      #9f7aea;
    --oc-green:       #39ff14;
    --oc-dim:         rgba(0, 212, 255, 0.12);
    --oc-border:      rgba(0, 212, 255, 0.28);
    --oc-border-hl:   rgba(0, 212, 255, 0.70);
    --oc-text:        #c8d8e8;
    --oc-text-dim:    rgba(200, 216, 232, 0.55);
    --oc-header-c:    #ffd700;
    --oc-sep-c:       rgba(0, 212, 255, 0.40);
    --oc-mono:        'Courier New', 'Consolas', monospace;
    --oc-corner-size: 14px;
    --oc-radius:      6px;
    --oc-z:           9500;
}

/* ── Overlay ──────────────────────────────────────────────────────────── */
#oracleChronicles {
    position: fixed;
    inset: 0;
    z-index: var(--oc-z);
    background:
        radial-gradient(ellipse at 20% 30%, rgba(99,58,237,0.18) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 70%, rgba(0,212,255,0.12) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 50%, rgba(2,4,14,0.96) 0%, #060810 100%);
    display: flex;
    align-items: stretch;
    justify-content: center;
    transition: opacity 0.35s ease;
    overflow: hidden;
}

#oracleChronicles.oc-hidden  { display: none; opacity: 0; }
#oracleChronicles.oc-visible { display: flex; opacity: 1; animation: ocFadeIn 0.4s ease forwards; }

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

/* Noise grain overlay */
#oracleChronicles::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
    opacity: 0.6;
}

/* ── Shared: hidden utility ───────────────────────────────────────────── */
.oc-hidden { display: none !important; }

/* ── Corner bracket mixin ─────────────────────────────────────────────── */
.oc-corners-wrap { position: relative; }
.oc-cc {
    position: absolute;
    width: var(--oc-corner-size);
    height: var(--oc-corner-size);
    pointer-events: none;
    z-index: 2;
}
.oc-cc-tl { top: -1px;  left: -1px;  border-top: 2px solid var(--oc-cyan); border-left: 2px solid var(--oc-cyan); }
.oc-cc-tr { top: -1px;  right: -1px; border-top: 2px solid var(--oc-cyan); border-right: 2px solid var(--oc-cyan); }
.oc-cc-bl { bottom: -1px; left: -1px;  border-bottom: 2px solid var(--oc-cyan); border-left: 2px solid var(--oc-cyan); }
.oc-cc-br { bottom: -1px; right: -1px; border-bottom: 2px solid var(--oc-cyan); border-right: 2px solid var(--oc-cyan); }

/* ══════════════════════════════════════════════════════════════════════════
   CHAPTER SELECT SCREEN
══════════════════════════════════════════════════════════════════════════ */
#ocChapterSelect {
    position: relative;
    z-index: 2;
    width: 100%;
    display: flex;
    flex-direction: column;
    padding: 36px 48px 32px;
    box-sizing: border-box;
}

/* Header bar */
.oc-cs-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 36px;
    border-bottom: 1px solid var(--oc-border);
    padding-bottom: 18px;
}

.oc-cs-title {
    font-family: var(--oc-mono);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--oc-gold);
    text-shadow: 0 0 18px rgba(255,215,0,0.45), 0 0 40px rgba(255,215,0,0.18);
    text-transform: uppercase;
}
.oc-cs-title::before {
    content: '◈ ';
    color: var(--oc-cyan);
}

/* Chapter grid */
#ocChapterGrid {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    justify-content: center;
    align-content: flex-start;
    flex: 1;
    overflow-y: auto;
    padding: 8px 4px 16px;
}
#ocChapterGrid::-webkit-scrollbar { width: 4px; }
#ocChapterGrid::-webkit-scrollbar-thumb { background: var(--oc-border); border-radius: 2px; }

/* Chapter card */
.oc-chapter-card {
    position: relative;
    width: 210px;
    border: 1px solid var(--oc-border);
    border-radius: var(--oc-radius);
    background: rgba(0,212,255,0.03);
    cursor: pointer;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.2s;
    overflow: visible;
}
.oc-chapter-card.oc-unlocked:hover {
    border-color: var(--oc-cyan);
    box-shadow: 0 0 22px rgba(0,212,255,0.22), inset 0 0 14px rgba(0,212,255,0.05);
    transform: translateY(-4px);
}
.oc-chapter-card.oc-unlocked:hover .oc-cc { border-color: var(--oc-gold); }

.oc-card-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 9 / 16;
    height: auto;
    background: rgba(0,212,255,0.06) center/cover no-repeat;
    border-radius: var(--oc-radius) var(--oc-radius) 0 0;
    overflow: hidden;
}
.oc-card-cover-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 40%, rgba(2,4,14,0.85) 100%);
}
.oc-lock-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.6rem;
    filter: drop-shadow(0 0 8px rgba(0,0,0,0.9));
    z-index: 2;
}
.oc-card-num {
    position: absolute;
    bottom: 8px;
    left: 12px;
    font-family: var(--oc-mono);
    font-size: 0.62rem;
    letter-spacing: 0.16em;
    color: var(--oc-cyan);
    font-weight: 700;
    z-index: 2;
}

.oc-card-info {
    padding: 14px 16px 16px;
}
.oc-card-title {
    font-family: var(--oc-mono);
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--oc-text);
    margin-bottom: 5px;
    text-transform: uppercase;
}
.oc-chapter-card.oc-locked .oc-card-title { color: var(--oc-text-dim); }
.oc-card-sub {
    font-family: var(--oc-mono);
    font-size: 0.68rem;
    color: var(--oc-text-dim);
    letter-spacing: 0.1em;
}

/* ══════════════════════════════════════════════════════════════════════════
   READER LAYOUT
══════════════════════════════════════════════════════════════════════════ */
#ocReader {
    position: relative;
    z-index: 2;
    width: 100%;
    display: flex;
    flex-direction: column;
}

/* Top bar ──────────────────────────────── */
.oc-reader-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    border-bottom: 1px solid var(--oc-border);
    flex-shrink: 0;
    background: rgba(0,0,0,0.35);
}

.oc-reader-title {
    font-family: var(--oc-mono);
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    color: var(--oc-gold);
    text-transform: uppercase;
    text-shadow: 0 0 12px rgba(255,215,0,0.35);
}

/* Split body ───────────────────────────── */
.oc-reader-body {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    min-height: 0;
    overflow: hidden;
}

/* ── LEFT: Image panel ─────────────────────────────────────────────────── */
.oc-image-panel {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 0;
    border-right: 1px solid var(--oc-border);
    background: rgba(0,0,0,0.25);
    overflow: hidden;
}

/* Ambient glow behind image */
.oc-image-panel::before {
    content: '';
    position: absolute;
    width: 70%;
    height: 70%;
    background: radial-gradient(ellipse, rgba(99,58,237,0.15) 0%, transparent 70%);
    pointer-events: none;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.oc-img-frame {
    position: relative;
    flex: 1;
    width: 100%;
    min-height: 0;
    border: none;
    border-radius: 0;
    overflow: hidden;
    background: rgba(0,0,0,0.5);
    box-shadow:
        inset 0 0 20px rgba(0,0,0,0.6);
}

/* Corner brackets on image frame */
.oc-img-frame::before,
.oc-img-frame::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    z-index: 4;
    pointer-events: none;
}
.oc-img-frame::before {
    top: -1px; left: -1px;
    border-top: 2px solid var(--oc-cyan);
    border-left: 2px solid var(--oc-cyan);
    box-shadow: -2px -2px 8px rgba(0,212,255,0.3);
}
.oc-img-frame::after {
    bottom: -1px; right: -1px;
    border-bottom: 2px solid var(--oc-cyan);
    border-right: 2px solid var(--oc-cyan);
    box-shadow: 2px 2px 8px rgba(0,212,255,0.3);
}

/* Extra corners via inner spans */
.oc-img-corner-tr,
.oc-img-corner-bl {
    position: absolute;
    width: 20px;
    height: 20px;
    z-index: 4;
    pointer-events: none;
}
.oc-img-corner-tr { top: -1px; right: -1px; border-top: 2px solid var(--oc-cyan); border-right: 2px solid var(--oc-cyan); box-shadow: 2px -2px 8px rgba(0,212,255,0.3); }
.oc-img-corner-bl { bottom: -1px; left: -1px; border-bottom: 2px solid var(--oc-cyan); border-left: 2px solid var(--oc-cyan); box-shadow: -2px 2px 8px rgba(0,212,255,0.3); }

/* ── Double-buffer images — stacked, crossfade ────────────────────────── */
.oc-page-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    opacity: 0;
    z-index: 2;
    transition: opacity 0.7s ease;
    transform-origin: center center;
}
.oc-page-img.oc-img-visible { opacity: 1; }
.oc-page-img.oc-img-hidden  { opacity: 0; }

/* ── Ken Burns animations (slowly pan/zoom while visible) ────────────── */
/* Each variant zooms/pans in a different direction */
.oc-page-img.oc-kb-1 {
    animation: ocKB1 10s ease-in-out forwards;
}
.oc-page-img.oc-kb-2 {
    animation: ocKB2 10s ease-in-out forwards;
}
.oc-page-img.oc-kb-3 {
    animation: ocKB3 10s ease-in-out forwards;
}
.oc-page-img.oc-kb-4 {
    animation: ocKB4 10s ease-in-out forwards;
}

/* Subtle drift — no zoom, just gentle pan */
@keyframes ocKB1 {
    from { transform: scale(1.0) translate(0%, 0%); }
    to   { transform: scale(1.0) translate(-1%, -0.5%); }
}
/* Drift right */
@keyframes ocKB2 {
    from { transform: scale(1.0) translate(1%, 0.5%); }
    to   { transform: scale(1.0) translate(-1%, -0.5%); }
}
/* Pan left to right */
@keyframes ocKB3 {
    from { transform: scale(1.0) translate(-1.5%, 0%); }
    to   { transform: scale(1.0) translate(1.5%, -0.5%); }
}
/* Drift down */
@keyframes ocKB4 {
    from { transform: scale(1.0) translate(-0.5%, -1%); }
    to   { transform: scale(1.0) translate(0.5%, 0.5%); }
}

/* Scan-lines overlay */
.oc-scanlines {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    background: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 3px,
        rgba(0,0,0,0.13) 3px,
        rgba(0,0,0,0.13) 4px
    );
}

/* Moving scan beam */
.oc-img-frame .oc-scan-beam {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(0,212,255,0.05) 49%,
        rgba(0,212,255,0.09) 50%,
        rgba(0,212,255,0.05) 51%,
        transparent 100%
    );
    animation: ocScanBeam 5s linear infinite;
    opacity: 0.7;
}
@keyframes ocScanBeam {
    0%   { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

/* CRT vignette */
.oc-img-overlay {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    background: radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,0.55) 100%);
}

/* Image label */
.oc-img-label {
    margin-top: 10px;
    font-family: var(--oc-mono);
    font-size: 0.62rem;
    letter-spacing: 0.22em;
    color: var(--oc-cyan);
    opacity: 0.65;
    text-transform: uppercase;
}

/* ── RIGHT: Text panel ─────────────────────────────────────────────────── */
.oc-text-panel {
    display: flex;
    flex-direction: column;
    padding: 28px 32px 16px 28px;
    overflow: hidden;
    background: rgba(0,0,0,0.18);
}

.oc-text-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--oc-mono);
    font-size: 0.60rem;
    letter-spacing: 0.22em;
    color: var(--oc-cyan);
    opacity: 0.70;
    margin-bottom: 18px;
    text-transform: uppercase;
    flex-shrink: 0;
}

/* Pulsing dot */
.oc-transmission-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--oc-cyan);
    box-shadow: 0 0 8px var(--oc-cyan);
    animation: ocDotPulse 1.4s ease-in-out infinite;
    flex-shrink: 0;
}
@keyframes ocDotPulse {
    0%, 100% { opacity: 1;   transform: scale(1); }
    50%       { opacity: 0.3; transform: scale(0.7); }
}

/* Text body — scrollable */
#ocTextBody {
    flex: 1;
    overflow-y: auto;
    font-family: var(--oc-mono);
    font-size: 0.97rem;
    line-height: 1.65;
    color: var(--oc-text);
    scroll-behavior: smooth;
}
#ocTextBody::-webkit-scrollbar { width: 3px; }
#ocTextBody::-webkit-scrollbar-thumb { background: var(--oc-border); border-radius: 2px; }

/* Lines */
.oc-line { min-height: 1.1em; white-space: pre-wrap; word-break: break-word; }
.oc-line-header {
    color: var(--oc-gold);
    font-weight: 700;
    letter-spacing: 0.1em;
    margin: 4px 0 2px;
    text-shadow: 0 0 10px rgba(255,215,0,0.35);
}
.oc-line-sep { color: var(--oc-sep-c); letter-spacing: 0.04em; }

/* Cursor */
#ocTextCursor {
    display: inline-block;
    font-family: var(--oc-mono);
    font-size: 1rem;
    color: var(--oc-cyan);
    animation: ocCursorBlink 0.9s step-end infinite;
    text-shadow: 0 0 8px var(--oc-cyan);
    flex-shrink: 0;
}
#ocTextCursor.oc-cursor-done {
    animation: ocCursorBlink 2.4s step-end infinite;
    opacity: 0.45;
}
@keyframes ocCursorBlink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}

/* Text footer */
.oc-text-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
    flex-shrink: 0;
}
.oc-page-num {
    font-family: var(--oc-mono);
    font-size: 0.60rem;
    letter-spacing: 0.18em;
    color: var(--oc-text-dim);
}

/* ── Bottom: Navigation ────────────────────────────────────────────────── */
.oc-reader-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 14px 28px;
    border-top: 1px solid var(--oc-border);
    background: rgba(0,0,0,0.35);
    flex-shrink: 0;
}

.oc-page-dots {
    display: flex;
    gap: 8px;
    align-items: center;
}
.oc-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0,212,255,0.22);
    border: 1px solid var(--oc-border);
    cursor: pointer;
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.oc-dot:hover { background: rgba(0,212,255,0.5); transform: scale(1.2); }
.oc-dot-active {
    background: var(--oc-cyan);
    box-shadow: 0 0 8px rgba(0,212,255,0.7);
    border-color: var(--oc-cyan);
}

/* ── Shared buttons ────────────────────────────────────────────────────── */

/* Close button */
.oc-close-btn,
.oc-back-btn,
.oc-nav-btn {
    position: relative;
    font-family: var(--oc-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    border: 1px solid var(--oc-border);
    border-radius: 4px;
    padding: 7px 18px;
    background: rgba(0,212,255,0.05);
    color: var(--oc-cyan);
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s, color 0.2s;
    white-space: nowrap;
}
.oc-close-btn:hover,
.oc-back-btn:hover,
.oc-nav-btn:hover {
    border-color: var(--oc-cyan);
    background: rgba(0,212,255,0.12);
    box-shadow: 0 0 14px rgba(0,212,255,0.22);
    color: #fff;
}
.oc-nav-btn:disabled {
    opacity: 0.28;
    cursor: not-allowed;
    pointer-events: none;
}
.oc-nav-btn.mute        { color: rgba(200,216,232,0.7); border-color: rgba(200,216,232,0.2); }
.oc-nav-btn.oc-muted    { color: #f87171; border-color: rgba(248,113,113,0.45); }
.oc-nav-btn.mute:hover,
.oc-nav-btn.oc-muted:hover  { background: rgba(248,113,113,0.08); box-shadow: 0 0 12px rgba(248,113,113,0.2); }
.oc-nav-btn.pause       { color: rgba(200,216,232,0.7); border-color: rgba(200,216,232,0.2); }
.oc-nav-btn.oc-paused   { color: #fbbf24; border-color: rgba(251,191,36,0.45); }
.oc-nav-btn.pause:hover,
.oc-nav-btn.oc-paused:hover { background: rgba(251,191,36,0.08); box-shadow: 0 0 12px rgba(251,191,36,0.2); }

/* Shimmer scan on hover */
.oc-close-btn::after,
.oc-back-btn::after,
.oc-nav-btn::after {
    content: '';
    position: absolute;
    top: 0; left: -60%;
    width: 40%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.18), transparent);
    transform: skewX(-20deg);
    transition: none;
    pointer-events: none;
}
.oc-close-btn:hover::after,
.oc-back-btn:hover::after,
.oc-nav-btn:hover::after {
    animation: ocBtnShimmer 0.5s ease forwards;
}
@keyframes ocBtnShimmer {
    from { left: -60%; }
    to   { left: 120%; }
}

/* ── Menu launch button (in startScreen) ───────────────────────────────── */
#chroniclesMenuBtn {
    /* inherits .menu-btn — just color overrides */
    border-color: rgba(159,122,234,0.5) !important;
    color: #c4b5fd !important;
}
#chroniclesMenuBtn:hover {
    border-color: #9f7aea !important;
    background: rgba(159,122,234,0.12) !important;
    box-shadow: 0 0 16px rgba(159,122,234,0.25) !important;
    color: #fff !important;
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .oc-reader-body {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
    }
    .oc-image-panel {
        border-right: none;
        border-bottom: 1px solid var(--oc-border);
        padding: 16px;
        max-height: 240px;
    }
    .oc-img-frame {
        max-width: 100%;
        aspect-ratio: 16/7;
    }
    .oc-text-panel {
        padding: 16px 20px;
    }
    #ocChapterSelect {
        padding: 24px 20px;
    }
    .oc-cs-title {
        font-size: 1.2rem;
    }
    #ocChapterGrid {
        gap: 18px;
    }
    .oc-chapter-card {
        width: 220px;
    }
}

@media (max-width: 600px) {
    .oc-reader-header {
        padding: 10px 14px;
    }
    .oc-reader-title {
        font-size: 0.70rem;
    }
    .oc-nav-btn, .oc-close-btn, .oc-back-btn {
        font-size: 0.62rem;
        padding: 6px 12px;
    }
    #ocTextBody {
        font-size: 0.85rem;
    }
}