/* ========================================
   POEM SECTION
   Book, pages, ink effects, pending state styles
   ======================================== */

/* === CSS VARIABLES === */
:root {
    --ink-wet: rgba(45, 28, 20, 0.95);
    --ink-drying: rgba(61, 40, 28, 0.88);
    --ink-dry: rgba(92, 64, 51, 0.82);
    --paper-cream: #f5ead6;
    --paper-shadow: #e8dcc4;
}

/* === POEM CONTAINER === */
.poem-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 700px;
    text-align: center;
    z-index: 25;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    transition: none;
    perspective: 1200px;
    will-change: transform; /* prevent CLS during load */
    backface-visibility: hidden; /* force GPU layer for stable positioning */
    -webkit-backface-visibility: hidden;
}

@media (max-width: 768px) {
    .poem-container {
        transition: top 0.3s ease, transform 0.3s ease;
    }

    /* When keyboard active, JS will set --keyboard-center-top */
    .poem-container.input-focused {
        top: var(--keyboard-center-top, 30%);
    }
}

/* === POEM PROMPT (positioned below closed book) === */
.poem-prompt {
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.1rem;
    color: rgba(200, 180, 220, 0.7);
    letter-spacing: 2px;
    white-space: nowrap;
    opacity: 0;
    animation: prompt-fade 3s ease-in-out infinite;
    /* Prevent text selection */
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    cursor: default;
}

.poem-prompt.visible { opacity: 1; }

@keyframes prompt-fade {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.9; }
}

/* === BOOK WRAPPER (Closed Book) === */
.book-wrapper {
    position: relative;
    width: 160px;
    height: 160px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
    opacity: 0;
    flex-shrink: 0;
    z-index: 10;
}

.book-wrapper.visible {
    opacity: 1;
}

.book-wrapper.dormant {
    cursor: pointer;
}

.book-wrapper.dormant:hover {
    transform: scale(1.06) rotateY(-3deg) rotateX(2deg);
}

.book-wrapper.dormant:active {
    transform: scale(0.97);
}

.book-wrapper.awakening {
    cursor: default;
}

/* === CLOSED BOOK SVG === */
.closed-book-svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 8px 24px rgba(200, 180, 220, 0.25));
    animation: book-breathe 4s ease-in-out infinite;
}

@keyframes book-breathe {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

/* === RING GLOW (like seed) === */
.book-ring-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 280px;
    height: 280px;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0;
    transition: all 0.8s ease;
    filter: blur(25px);
    background: radial-gradient(circle, rgba(200, 180, 220, 0.15), transparent 70%);
    z-index: -1;
}

/* === BOOK GLOW LAYERS (behind book) === */
.book-glow-layer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    pointer-events: none;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

.book-glow-core {
    width: 80px;
    height: 80px;
    background: radial-gradient(circle,
        rgba(255, 180, 120, 0.5) 0%,
        transparent 70%
    );
    filter: blur(10px);
}

.book-glow-inner {
    width: 120px;
    height: 120px;
    background: radial-gradient(circle,
        rgba(200, 180, 220, 0.25) 0%,
        transparent 70%
    );
    filter: blur(18px);
}

.book-glow-outer {
    width: 180px;
    height: 180px;
    background: radial-gradient(circle,
        rgba(160, 140, 190, 0.1) 0%,
        transparent 80%
    );
    filter: blur(30px);
}

.book-glow-atmosphere {
    width: 260px;
    height: 260px;
    background: radial-gradient(circle,
        rgba(255, 80, 40, 0.06) 0%,
        transparent 80%
    );
    filter: blur(40px);
}

/* === GLOW STATE: DORMANT (exactly like seed) === */
.book-wrapper.dormant .book-glow-core,
.book-wrapper.dormant .book-glow-inner,
.book-wrapper.dormant .book-glow-outer,
.book-wrapper.dormant .book-glow-atmosphere {
    opacity: 0;
}

/* === GLOW STATE: AWAKENING (exactly like seed) === */
.book-wrapper.awakening .book-glow-core {
    opacity: 0.6;
    animation: glow-pulse-core 3s ease-in-out infinite;
}

.book-wrapper.awakening .book-glow-inner {
    opacity: 0.4;
    animation: glow-pulse-inner 3.5s ease-in-out infinite;
}

.book-wrapper.awakening .book-glow-outer {
    opacity: 0.3;
    animation: glow-pulse-outer 4s ease-in-out infinite;
}

.book-wrapper.awakening .book-glow-atmosphere {
    opacity: 0.2;
    animation: glow-pulse-atmo 5s ease-in-out infinite;
}

.book-wrapper.awakening .book-ring-glow {
    opacity: 1;
    animation: ring-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse-core {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.4; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.6; }
}

@keyframes glow-pulse-inner {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.25; }
    50% { transform: translate(-50%, -50%) scale(1.08); opacity: 0.4; }
}

@keyframes glow-pulse-outer {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.15; }
    50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.25; }
}

@keyframes glow-pulse-atmo {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.1; }
    50% { transform: translate(-50%, -50%) scale(1.03); opacity: 0.15; }
}

/* === SOFT SHOCKWAVE (faint misty tidal wave) === */
.soft-shockwave {
    position: fixed;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: -1;
    background: radial-gradient(circle,
        rgba(255, 200, 160, 0.15) 0%,
        rgba(255, 160, 120, 0.08) 40%,
        transparent 70%
    );
    animation: soft-wave-expand 1s cubic-bezier(0.2, 0, 0.3, 1) forwards;
}

@keyframes soft-wave-expand {
    0% { width: 40px; height: 40px; opacity: 0.4; }
    100% { width: 300px; height: 300px; opacity: 0; }
}

/* Dusty ember particles */
.dust-ember {
    position: fixed;
    width: 4px;
    height: 4px;
    background: radial-gradient(circle,
        rgba(255, 180, 140, 0.7) 0%,
        rgba(200, 180, 220, 0.4) 60%,
        transparent 100%
    );
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 0 6px rgba(255, 150, 100, 0.5);
}

.dust-ember-white {
    position: fixed;
    width: 3px;
    height: 3px;
    background: radial-gradient(circle,
        rgba(255, 250, 255, 0.8) 0%,
        rgba(255, 220, 190, 0.5) 60%,
        transparent 100%
    );
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 0 5px rgba(255, 240, 220, 0.6);
}

/* Background embers */
.background-ember {
    position: fixed;
    width: 5px;
    height: 5px;
    background: radial-gradient(circle,
        rgba(255, 180, 140, 0.6) 0%,
        rgba(200, 180, 220, 0.3) 60%,
        transparent 100%
    );
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 0 8px rgba(255, 150, 100, 0.4);
}

.background-ember-white {
    position: fixed;
    width: 4px;
    height: 4px;
    background: radial-gradient(circle,
        rgba(255, 250, 240, 0.7) 0%,
        rgba(255, 230, 200, 0.4) 60%,
        transparent 100%
    );
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 0 6px rgba(255, 245, 230, 0.5);
}

/* === RADIAL BURST EFFECT === */
.radial-burst {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 100;
}

.burst-ring {
    width: 60px;
    height: 60px;
    border: 2px solid rgba(255, 200, 160, 0.7);
    background: radial-gradient(circle, rgba(255, 180, 120, 0.15) 0%, transparent 70%);
}

.burst-glow {
    width: 50px;
    height: 50px;
    background: radial-gradient(circle,
        rgba(255, 180, 120, 0.4) 0%,
        rgba(200, 180, 220, 0.2) 40%,
        transparent 70%);
    filter: blur(8px);
}

.burst-ember {
    position: fixed;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 99;
}

.burst-ember.warm {
    background: radial-gradient(circle, rgba(200, 180, 220, 0.9) 0%, rgba(160, 140, 190, 0.6) 50%, transparent 70%);
    box-shadow: 0 0 8px rgba(200, 180, 220, 0.8);
}

.burst-ember.light {
    background: radial-gradient(circle, rgba(255, 250, 255, 0.9) 0%, rgba(255, 220, 180, 0.7) 50%, transparent 70%);
    box-shadow: 0 0 10px rgba(255, 250, 255, 0.9), 0 0 4px rgba(200, 180, 220, 0.6);
}

/* === OPEN BOOK WRAPPER === */
.open-book-wrapper {
    position: relative;
    transform-style: preserve-3d;
    perspective: 1200px;
    z-index: 10;
}

/* === OPEN BOOK === */
.open-book {
    display: flex;
    width: 680px;
    height: 440px;
    transform-style: preserve-3d;
    transition: transform 0.15s ease-out;
}

/* === PAGE STYLES === */
.book-page {
    position: relative;
    flex: 1;
    background: var(--paper-cream);
    overflow: hidden;
}

.book-page::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
}

.page-left {
    border-radius: 8px 0 0 8px;
    background: linear-gradient(90deg,
        rgba(0,0,0,0.08) 0%,
        var(--paper-cream) 3%,
        var(--paper-cream) 95%,
        var(--paper-shadow) 100%
    );
    box-shadow:
        inset 3px 0 8px rgba(0,0,0,0.1),
        -4px 0 12px rgba(0,0,0,0.2);
    transform-style: preserve-3d;
    transform-origin: right center;
}

/* === SWIPE HANDLE (interactive grabbable element) === */
.swipe-handle {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 100px;
    background: linear-gradient(90deg,
        rgba(160, 140, 180, 0.3) 0%,
        rgba(160, 140, 180, 0.15) 60%,
        transparent 100%
    );
    border-radius: 0 8px 8px 0;
    opacity: 0;
    transition: opacity 0.3s ease, background 0.2s ease;
    z-index: 10;
    pointer-events: none; /* Only enabled when has content */
    cursor: grab;
}

.swipe-handle:active {
    cursor: grabbing;
}

/* Only show and enable handle when there's content to send */
.page-left.has-content .swipe-handle {
    opacity: 0.7;
    pointer-events: auto;
}

.page-left.has-content .swipe-handle:hover {
    opacity: 1;
    background: linear-gradient(90deg,
        rgba(160, 140, 180, 0.45) 0%,
        rgba(160, 140, 180, 0.25) 60%,
        transparent 100%
    );
}

/* Shimmer effect */
.swipe-handle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 5px;
    transform: translateY(-50%);
    width: 4px;
    height: 50px;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(220, 200, 240, 0.5) 30%,
        rgba(220, 200, 240, 0.6) 50%,
        rgba(220, 200, 240, 0.5) 70%,
        transparent 100%
    );
    border-radius: 2px;
    animation: handle-shimmer 3s ease-in-out infinite;
}

@keyframes handle-shimmer {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* === LEFT PAGE - Default cursor === */
.page-left {
    cursor: default;
}

/* NO grab cursor on page itself - only on handle */

.page-right {
    border-radius: 0 8px 8px 0;
    background: linear-gradient(-90deg,
        rgba(0,0,0,0.06) 0%,
        var(--paper-cream) 3%,
        var(--paper-cream) 95%,
        var(--paper-shadow) 100%
    );
    box-shadow:
        inset -3px 0 8px rgba(0,0,0,0.08),
        4px 0 12px rgba(0,0,0,0.15);
}

/* === BOOK SPINE === */
.book-spine {
    width: 16px;
    background: linear-gradient(90deg,
        #c4a882 0%,
        #e8d4f0 20%,
        #bfa478 50%,
        #e8d4f0 80%,
        #c4a882 100%
    );
    box-shadow:
        inset 0 0 10px rgba(0,0,0,0.3),
        0 0 8px rgba(0,0,0,0.2);
    position: relative;
}

.book-spine::before {
    content: '';
    position: absolute;
    top: 10%;
    bottom: 10%;
    left: 50%;
    width: 2px;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(0,0,0,0.15) 20%,
        rgba(0,0,0,0.2) 50%,
        rgba(0,0,0,0.15) 80%,
        transparent 100%
    );
    transform: translateX(-50%);
}

/* === WRITING AREA === */
.writing-area {
    position: absolute;
    top: 40px;
    left: 35px;
    right: 25px;
    bottom: 40px;
    overflow: hidden;
}

.page-right .writing-area {
    left: 25px;
    right: 35px;
}

/* === INK DISPLAY === */
.ink-display {
    position: relative;
    width: 100%;
    height: 100%;
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-size: 1.15rem;
    line-height: 1.9;
    color: var(--ink-wet);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Individual letter spans for ink effect */
.ink-letter {
    display: inline;
    transition: color 2s ease-out, text-shadow 1.5s ease-out, filter 1s ease-out;
}

.ink-letter.wet {
    color: var(--ink-wet);
    text-shadow: 0 0 1px rgba(45, 28, 20, 0.3);
    filter: url(#ink-bleed);
}

.ink-letter.drying {
    color: var(--ink-drying);
    text-shadow: none;
    filter: none;
}

.ink-letter.dry {
    color: var(--ink-dry);
    text-shadow: none;
    filter: none;
}

/* Typing speed weight variation */
.ink-letter.fast {
    font-weight: 300;
}

.ink-letter.normal {
    font-weight: 400;
}

.ink-letter.slow {
    font-weight: 500;
}

/* Cursor - hidden by default, visible when textarea is focused */
.ink-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--ink-wet);
    margin-left: 2px;
    vertical-align: text-bottom;
    opacity: 0;
    animation: none;
}

/* Show cursor only when book has cursor-visible class (set on focus) */
.open-book.cursor-visible .ink-cursor {
    opacity: 1;
    animation: cursor-blink 1.1s ease-in-out infinite;
}

/* Frozen cursor: visible but not blinking (during help modal) */
.open-book.cursor-frozen .ink-cursor {
    opacity: 1;
    animation: none;
}

@keyframes cursor-blink {
    0%, 45% { opacity: 1; }
    50%, 95% { opacity: 0; }
    100% { opacity: 1; }
}

/* === HIDDEN TEXTAREA === */
.hidden-poem-input {
    position: fixed;
    left: -9999px;
    opacity: 0;
    font-size: 16px; /* Prevent iOS auto-zoom on focus */
}

/* === MOBILE KEYBOARD SCROLL-LOCK === */
/* When keyboard is active, lock everything to prevent scroll/bounce */
html.keyboard-active,
body.keyboard-active {
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
    touch-action: none;
    overscroll-behavior: none;
}

/* Scale book down when keyboard active to fit in remaining space */
@media (max-width: 768px) {
    body.keyboard-active .open-book-wrapper {
        transform: scale(var(--keyboard-book-scale, 1));
        transform-origin: center center;
    }
}

/* === RIGHT PAGE DECORATION === */
.right-page-decor {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.12;
    pointer-events: none;
}

/* === CHARACTER COUNT === */
.char-count {
    position: absolute;
    bottom: 15px;
    right: 20px;
    font-size: 0.8rem;
    color: rgba(92, 64, 51, 0.4);
    letter-spacing: 1px;
}

/* === BOOK HELPER === */
.book-helper {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: rgba(200, 180, 220, 0.15);
    border: 1px solid rgba(200, 180, 220, 0.25);
    border-radius: 50%;
    color: #e8d4f0;
    cursor: pointer;
    transition: all 0.3s ease, bottom 0.3s ease;
    z-index: 26;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    opacity: 0;
    pointer-events: none;
    transform: translateZ(0); /* force GPU layer - fixes click dead zones */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.book-helper.visible {
    opacity: 1;
    pointer-events: auto;
}

.book-helper:hover {
    background: rgba(200, 180, 220, 0.25);
    border-color: rgba(200, 180, 220, 0.4);
    box-shadow: 0 0 15px rgba(200, 180, 220, 0.3);
}

/* Blurping animation (same as whisper envelope) */
.book-helper.blurping {
    animation: blurp 0.4s ease-out 2;
}

/* Mobile keyboard handling for helper */
@media (max-width: 768px) {
    .book-helper {
        bottom: 20px;
        right: 20px;
        width: 36px;
        height: 36px;
        /* Smooth transition for keyboard position changes */
        transition: all 0.3s ease, top 0.2s ease-out;
    }

    /* Position helper to right side, vertically centered in visible area when keyboard active */
    .book-helper.input-focused {
        bottom: auto;
        top: var(--keyboard-helper-top, 50%);
        transform: translateY(-50%);
    }
}

/* === TRANSITIONAL BOOK (during send) === */
.transitional-book {
    filter: drop-shadow(0 4px 20px rgba(200, 180, 220, 0.4));
}

.transitional-book svg {
    width: 100%;
    height: 100%;
}

/* === PENDING STATE === */
.pending-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    opacity: 0;
    transition: opacity 1s ease;
}

.pending-wrapper.visible {
    opacity: 1;
}

.pending-book {
    position: relative;
    width: 100px;
    height: 100px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.pending-book:hover {
    transform: scale(1.1);
}

.pending-book-svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 16px rgba(200, 180, 220, 0.4));
    animation: pending-float 3s ease-in-out infinite;
}

@keyframes pending-float {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-8px) rotate(2deg); }
}

/* Orbiting embers */
.orbit-ember {
    position: absolute;
    width: 6px;
    height: 6px;
    background: radial-gradient(circle, rgba(255, 250, 255, 0.9), rgba(200, 180, 220, 0.8));
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(200, 180, 220, 0.8);
    top: 50%;
    left: 50%;
    animation: orbit 3s linear infinite;
}

.orbit-ember:nth-child(2) {
    animation-delay: -1s;
    animation-duration: 4s;
}

.orbit-ember:nth-child(3) {
    animation-delay: -2s;
    animation-duration: 5s;
}

@keyframes orbit {
    0% { transform: translate(-50%, -50%) rotate(0deg) translateX(60px) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg) translateX(60px) rotate(-360deg); }
}

.pending-text {
    color: rgba(200, 180, 220, 0.8);
    font-size: 1.1rem;
    letter-spacing: 2px;
    animation: text-glow 2s ease-in-out infinite;
}

@keyframes text-glow {
    0%, 100% { text-shadow: 0 0 10px rgba(200, 180, 220, 0.3); }
    50% { text-shadow: 0 0 20px rgba(255, 180, 120, 0.5); }
}

/* === MOBILE RESPONSIVE === */
@media (max-width: 768px) {
    .open-book {
        width: 95vw;
        max-width: 560px;
        height: 320px;
    }

    .book-spine {
        width: 10px;
    }

    .writing-area {
        top: 18px;
        left: 15px;
        right: 12px;
        bottom: 18px;
    }

    .page-right .writing-area {
        left: 12px;
        right: 15px;
    }

    .ink-display {
        font-size: 0.9rem;
        line-height: 1.65;
    }

    .book-wrapper {
        width: 130px;
        height: 130px;
    }

    .right-page-decor svg {
        width: 120px;
        height: 150px;
    }

    .char-count {
        font-size: 0.7rem;
        bottom: 6px;
        right: 10px;
    }

    .poem-prompt {
        font-size: 1.1rem;
    }
}

@media (max-width: 420px) {
    .open-book {
        width: 98vw;
        height: 280px;
    }

    .ink-display {
        font-size: 0.82rem;
        line-height: 1.55;
    }

    .writing-area {
        top: 14px;
        left: 12px;
        right: 10px;
        bottom: 14px;
    }

    .right-page-decor {
        opacity: 0.08;
    }
}