/* 
 * REFLECTION WINDOW - ART PIECE STYLING
 * Concept: The Breathing Void / 呼吸する虚空
 * 
 * Palette:
 * - Void: #08080b (Deep, not quite black)
 * - Ink: #e6e6ef (Off-white, paper-like)
 * - Ghost: #8aa7ff (Pale blue, bioluminescent)
 * - Muted: #606070 (Fading memory)
 */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,400&family=Shippori+Mincho:wght@400;500;600&family=Space+Mono:ital,wght@0,400;0,700;1,400&display=swap');

:root {
    --bg: #08080b;
    --fg: #e6e6ef;
    --mute: #606070;
    --accent: #8aa7ff;
    --accent-glow: rgba(138, 167, 255, 0.2);
    --font-serif: "Cormorant Garamond", "Yu Mincho", "Hiragino Mincho ProN", serif;
    --font-jp: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", serif;
    --font-mono: "Space Mono", monospace;
    --easing: cubic-bezier(0.2, 0.0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    background-color: var(--bg);
    color: var(--fg);
    font-family: var(--font-jp);
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-font-smoothing: antialiased;
    font-variant-numeric: lining-nums;
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* ===== TEXTURE OVERLAY (SVG NOISE) ===== */
.texture-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.07;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ===== LAYOUT & SCROLL ===== */
main {
    min-height: 100vh;
    scroll-behavior: smooth;
    scrollbar-width: none;
    /* Firefox */
}

main::-webkit-scrollbar {
    display: none;
    /* Chrome/Safari */
}

#gate {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
    text-align: center;
}

section {
    min-height: 100vh;
    width: 100%;
    display: grid;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: 2rem;
    opacity: 0;
    /* JS Reveal */
    transition: opacity 1.5s var(--easing), transform 1.5s var(--easing);
    transform: translateY(20px);
    text-align: center;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== TYPOGRAPHY ===== */
h1,
h2 {
    font-weight: 300;
    letter-spacing: 0.05em;
    margin: 0 0 1.5rem 0;
    font-feature-settings: "palt";
}

h1 {
    font-size: clamp(2.4rem, 6vw, 4.5rem);
    text-shadow: 0 0 20px var(--accent-glow);
}

h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
}

p {
    font-size: clamp(1.15rem, 1.5vw, 1.4rem);
    line-height: 2;
    margin: 1rem 0;
    max-width: 60ch;
    color: rgba(230, 230, 239, 0.9);
}

.small {
    font-size: 0.95em;
}

.tiny {
    font-size: 0.85em;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-family: var(--font-mono);
    color: var(--mute);
    margin-bottom: 1rem;
    display: block;
}

.muted {
    color: var(--mute);
}

.ghost,
.throat-sound {
    font-family: var(--font-serif);
}

/* ===== COMPONENTS ===== */

/* Crease Line (Paper Fold) */
.crease-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--mute), transparent);
    opacity: 0.3;
    z-index: -1;
}

/* Button */
.button {
    font-family: var(--font-mono);
    border: 1px solid var(--mute);
    padding: 1rem 2rem;
    border-radius: 999px;
    background: transparent;
    color: var(--fg);
    cursor: pointer;
    transition: all 0.5s var(--easing);
    position: relative;
    overflow: hidden;
}

.button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent);
    opacity: 0;
    transition: opacity 0.5s;
    z-index: -1;
    filter: blur(10px);
}

.button:hover {
    border-color: var(--accent);
    letter-spacing: 0.1em;
    text-shadow: 0 0 8px var(--accent);
}

.button:hover::before {
    opacity: 0.2;
}

.button:disabled {
    opacity: 0.3;
    cursor: default;
    pointer-events: none;
}

/* Quote Box */
.quote-box {
    border-left: 1px solid var(--mute);
    padding-left: 1.5rem;
    margin: 2rem 0;
    position: relative;
}

.quote-box::before {
    content: '';
    position: absolute;
    left: -1px;
    top: 0;
    height: 0%;
    width: 1px;
    background: var(--accent);
    transition: height 1s 0.5s var(--easing);
}

section.visible .quote-box::before {
    height: 100%;
}

/* Code Block */
.code-block {
    font-family: var(--font-mono);
    background: rgba(10, 10, 14, 0.8);
    border: 1px solid var(--mute);
    padding: 1.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    line-height: 1.6;
    margin: 2rem 0;
    position: relative;
    backdrop-filter: blur(5px);
}

.code-block::after {
    content: 'LOG';
    position: absolute;
    top: -0.6em;
    right: 1rem;
    background: var(--bg);
    padding: 0 0.5rem;
    font-size: 0.6rem;
    color: var(--mute);
}

/* Margin Whisper (Improved) */
.margin-whisper {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--mute);
    border-top: 1px solid var(--mute);
    padding-top: 1rem;
    margin-top: 3rem;
    font-size: 0.8rem;
    text-align: right;
    width: 100%;
    opacity: 0.6;
}

/* Throat Sound Animation */
.throat-sound span {
    display: inline-block;
    transition: transform 0.3s, opacity 0.3s;
}

/* Index */
.index {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    padding: 0;
    max-width: 800px;
}

.index li {
    list-style: none;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.index a {
    color: var(--mute);
    text-decoration: none;
    border-bottom: 1px dotted transparent;
    transition: all 0.3s;
}

.index a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Canvas Container */
#canvas-container {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
}

/* Whisper Collection */
.whisper-collection {
    text-align: left;
    display: inline-block;
    margin: 1.5rem auto;
}

.whisper-collection p {
    margin: 0.6rem 0;
    font-size: 0.95rem;
    color: rgba(230, 230, 239, 0.75);
}

/* Quote Box (AI Reading Cards) */
.quote-box {
    font-family: var(--font-jp);
    border-left: 2px solid var(--accent);
    padding: 1.5rem 2rem;
    margin: 1rem auto;
    background: rgba(138, 167, 255, 0.02);
    line-height: 1.9;
    width: 100%;
    max-width: 700px;
    box-sizing: border-box;
    text-align: left;
}

.quote-box p {
    margin: 0.6rem 0;
    font-size: 1rem;
    max-width: none;
}

.quote-box .tiny {
    font-size: 0.85rem;
    letter-spacing: 0.02em;
    line-height: 1.8;
}

.quote-box .muted {
    color: rgba(230, 230, 239, 0.7);
}

.quote-box strong {
    color: var(--fg);
    font-weight: 500;
}

/* AI Reading Card Container - 統一されたレイアウト */
section.center>div[style*="max-width: 700px"],
section.center>div[style*="max-width:700px"] {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    padding: 0 1rem;
    box-sizing: border-box;
    text-align: left;
}

/* セクション内のカードを確実に中央配置 */
section.center {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* End Button */
.endbtn {
    font-family: var(--font-jp);
    font-size: 0.9rem;
    padding: 1rem 2.5rem;
    background: transparent;
    border: 1px solid var(--mute);
    border-radius: 8px;
    color: var(--fg);
    cursor: pointer;
    transition: all 0.3s var(--easing);
    margin: 1.5rem 0;
}

.endbtn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow), inset 0 0 10px var(--accent-glow);
}

.endbtn:active {
    transform: scale(0.98);
}

/* ===== GHOST SECTION IMPROVEMENTS ===== */
.section-divider {
    margin: 4rem 0 2rem 0;
}

.code-block .key {
    color: var(--accent);
}

.code-block .val {
    color: var(--fg);
}

.code-block .comment {
    color: var(--mute);
    font-size: 0.75rem;
}

section ul {
    text-align: left;
    margin: 1rem auto;
    padding-left: 1.5rem;
    max-width: 600px;
    display: inline-block;
    box-sizing: border-box;
}

section ul li {
    margin: 0.5rem 0;
    line-height: 1.8;
    list-style-position: inside;
    text-indent: -1em;
    padding-left: 1em;
}

/* AI Tag */
.ai-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--mute);
    margin-top: 1rem;
    opacity: 0.6;
}

/* Page Number */
.page-num {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--mute);
    margin-top: 2rem;
    opacity: 0.4;
}

/* ===== MOBILE RESPONSIVE (max-width: 640px) ===== */
@media screen and (max-width: 640px) {

    /* Base typography - larger for readability */
    html {
        font-size: 17px;
    }

    body {
        line-height: 1.9;
    }

    /* Headers */
    h1 {
        font-size: 1.85rem;
        margin-bottom: 1rem;
    }

    h2 {
        font-size: 1.45rem;
        margin-bottom: 1rem;
        line-height: 1.6;
    }

    /* Paragraphs */
    p {
        font-size: 1.05rem;
        line-height: 1.95;
        margin: 0.7rem 0;
    }

    .small {
        font-size: 0.95em;
    }

    .tiny {
        font-size: 0.8em;
        line-height: 1.7;
    }

    /* Improve contrast for muted text on mobile */
    .muted {
        color: rgba(160, 160, 180, 0.95);
    }

    .muted.small {
        color: rgba(175, 175, 195, 0.95);
    }

    /* Section padding */
    section {
        padding: 1.5rem 1.25rem;
        min-height: auto;
        padding-top: 3rem;
        padding-bottom: 3rem;
    }

    #gate {
        padding: 0 1.25rem;
    }

    /* Buttons */
    .button {
        padding: 0.9rem 1.5rem;
        font-size: 0.95rem;
    }

    .endbtn {
        padding: 0.85rem 1.5rem;
        font-size: 0.9rem;
    }

    /* Quote Box - AI Reading Cards */
    .quote-box {
        padding: 1.25rem 1rem;
        margin: 1rem auto;
        border-left-width: 3px;
        max-width: 100%;
        width: calc(100% - 0.5rem);
        word-break: break-word;
        overflow-wrap: anywhere;
    }

    /* 読了カードのコンテナ - 中央配置を強制 */
    section.center>div[style*="max-width"] {
        width: calc(100% - 1rem);
        max-width: 100%;
        padding: 0 0.5rem;
        margin: 0 auto;
    }

    .quote-box p {
        font-size: 0.95rem;
        line-height: 1.85;
    }

    .quote-box .tiny {
        font-size: 0.85rem;
        line-height: 1.75;
    }

    .quote-box .muted {
        color: rgba(180, 180, 200, 0.9);
    }

    /* Code Block */
    .code-block {
        padding: 1rem;
        font-size: 0.8rem;
        overflow-x: auto;
        white-space: pre-wrap;
        word-break: break-word;
    }

    /* Lists */
    section ul {
        padding-left: 1.25rem;
    }

    section ul li {
        font-size: 0.95rem;
        line-height: 1.8;
        margin: 0.5rem 0;
    }

    /* Margin Whisper */
    .margin-whisper {
        font-size: 0.9rem;
        padding-top: 0.8rem;
        margin-top: 2rem;
    }

    /* Throat Sound */
    .throat-sound {
        font-size: 1.6rem;
    }

    .throat-sound span {
        margin: 0 0.2rem;
    }

    /* Index cards */
    .index {
        gap: 0.85rem;
    }

    .index li {
        font-size: 0.8rem;
    }

    /* Ghost section specific fixes */
    .section-divider {
        margin: 2rem 0 1rem 0;
    }

    /* AI Tag and Page Num */
    .ai-tag {
        font-size: 0.75rem;
    }

    .page-num {
        font-size: 0.7rem;
        margin-top: 1.5rem;
    }

    /* Whisper collection */
    .whisper-collection p {
        font-size: 0.95rem;
    }
}

/* ===== EXTRA SMALL MOBILE (max-width: 375px) ===== */
@media screen and (max-width: 375px) {
    html {
        font-size: 16px;
    }

    h1 {
        font-size: 1.6rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    p {
        font-size: 1rem;
    }

    section {
        padding: 1.25rem 1rem;
    }

    .code-block {
        font-size: 0.75rem;
        padding: 0.85rem;
    }

    .quote-box {
        padding: 1rem 0.85rem;
    }

    .quote-box p {
        font-size: 0.9rem;
    }

    .quote-box .tiny {
        font-size: 0.8rem;
    }
}

/* ===== FIXED BACK LINK ===== */
.fixed-back-link {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 10000;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--mute);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    background: rgba(8, 8, 11, 0.7);
    border: 1px solid rgba(96, 96, 112, 0.3);
    border-radius: 4px;
    backdrop-filter: blur(8px);
    transition: all 0.3s var(--easing);
    opacity: 0.6;
}

.fixed-back-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    opacity: 1;
    box-shadow: 0 0 12px var(--accent-glow);
}

@media screen and (max-width: 640px) {
    .fixed-back-link {
        top: 1rem;
        left: 1rem;
        font-size: 0.7rem;
        padding: 0.4rem 0.6rem;
    }
}