/* ============================================================
   logic.quest — Styles
   Japanese-minimal proof manuscript aesthetic
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    --kaki: #c87941;
    --washi: #f5f0e8;
    --sumi: #2b2520;
    --kobai: #a85a2a;
    --kinari: #ece5d8;
    --matsu: #6b7c5e;
    --hai: #9a9287;

    --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
    --font-body: 'Source Sans 3', 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    --ma-space: 48px;
    --gutter: 32px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.15vw, 1.15rem);
    line-height: 1.75;
    letter-spacing: 0.01em;
    color: var(--sumi);
    background: linear-gradient(180deg, var(--washi) 0%, var(--kinari) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- Asanoha Background Pattern (subtle) --- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='%23c87941' stroke-width='0.5'/%3E%3Cpath d='M30 0L30 60M0 30L60 30' fill='none' stroke='%23c87941' stroke-width='0.3'/%3E%3Cpath d='M0 0L30 30L0 60M60 0L30 30L60 60' fill='none' stroke='%23c87941' stroke-width='0.3'/%3E%3C/svg%3E");
    background-size: 60px 60px;
}

/* --- Scroll Progress Indicator --- */
.scroll-progress {
    position: fixed;
    top: 0;
    right: 0;
    width: 3px;
    height: 100vh;
    z-index: 1000;
    pointer-events: none;
}

.scroll-progress::after {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background: var(--kaki);
    border-radius: 1.5px;
    transform-origin: top center;
    transform: scaleY(0);
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.scroll-progress:hover::after {
    opacity: 1;
}

/* --- Gate Sections --- */
.gate {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--gutter);
}

/* Gate I — The Premise */
.gate-i {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gate-i .gate-content {
    text-align: center;
    max-width: 800px;
    position: relative;
}

.persimmon-branch {
    max-width: 260px;
    margin: 0 auto 40px;
}

.gate-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(3.2rem, 8vw, 7rem);
    letter-spacing: 0.04em;
    line-height: 1.15;
    color: var(--sumi);
    margin-bottom: 24px;
}

.gate-thesis {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1.5vw, 1.25rem);
    line-height: 1.8;
    color: var(--hai);
    max-width: 600px;
    margin: 0 auto;
    letter-spacing: 0.02em;
}

/* --- Gate Dividers --- */
.gate-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 0;
    position: relative;
    z-index: 1;
}

.divider-line {
    display: block;
    width: 0;
    height: 1px;
    background: var(--kaki);
    opacity: 0.5;
    transition: width 0.6s ease-out;
}

.gate-divider.visible .divider-line {
    width: 40vw;
}

/* --- Gate Headers --- */
.gate-header {
    text-align: center;
    margin-bottom: var(--ma-space);
    padding-top: 80px;
}

.gate-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    letter-spacing: 0.02em;
    line-height: 1.3;
    color: var(--sumi);
    margin-bottom: 12px;
}

.gate-annotation {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--kaki);
    display: block;
}

/* --- Gate II — The Axioms --- */
.gate-ii {
    min-height: 100vh;
    padding-bottom: 80px;
}

.seed-pod-illustration {
    max-width: 140px;
    margin: 0 auto 40px;
    opacity: 0.8;
}

.axiom-cluster {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--ma-space);
    max-width: 960px;
    margin: 0 auto;
}

/* --- Content Blocks --- */
.block {
    position: relative;
    background: var(--kinari);
    border: 1px solid var(--kinari);
    padding: 32px;
    transition: border-color 0.3s ease;
}

.block:hover {
    border-color: var(--kaki);
}

/* Block sizes (tatami ratios) */
.ichijo {
    /* 1:2 ratio approximately */
}

.nijo {
    max-width: 720px;
}

.yojo {
    width: 100%;
    max-width: 100%;
    padding: 48px 32px;
}

.block-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    letter-spacing: 0.02em;
    line-height: 1.3;
    color: var(--sumi);
    margin-bottom: 16px;
}

.block-body {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.15vw, 1.15rem);
    line-height: 1.75;
    color: var(--sumi);
    margin-bottom: 16px;
}

.margin-annotation {
    display: block;
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--kaki);
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.block.in-center .margin-annotation {
    opacity: 1;
}

/* --- Logic Symbols --- */
.logic-symbol {
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--sumi);
    transition: color 0.2s ease, transform 0.2s ease;
    display: inline-block;
}

.logic-symbol:hover {
    color: var(--kaki);
    transform: translateY(-2px);
}

/* --- Skeleton Loading --- */
.skeleton-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 32px;
    z-index: 2;
    background: var(--kinari);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.skeleton-block.revealed .skeleton-placeholder {
    opacity: 0;
    pointer-events: none;
}

.skeleton-line {
    height: 12px;
    border-radius: 6px;
    margin-bottom: 12px;
    background: linear-gradient(90deg, var(--kinari) 0%, var(--washi) 50%, var(--kinari) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
}

.skeleton-line-title {
    width: 50%;
    height: 18px;
    margin-bottom: 20px;
}

.skeleton-line-body {
    width: 90%;
}

.skeleton-line-body.short {
    width: 60%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.block-content {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease 0.4s, transform 0.3s ease 0.4s;
}

.skeleton-block.revealed .block-content {
    opacity: 1;
    transform: translateY(0);
}

/* --- Gate III — The Derivation --- */
.gate-iii {
    min-height: 120vh;
    padding-bottom: 80px;
    position: relative;
}

.fern-illustration {
    position: absolute;
    left: 0;
    top: 80px;
    width: 60px;
    height: 100%;
    max-height: calc(100% - 160px);
    opacity: 0.7;
    z-index: 0;
}

.fern-illustration .svg-fern {
    width: 100%;
    height: 100%;
}

.derivation-column {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
    padding-left: 40px;
}

.proof-line {
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--kaki);
    opacity: 0.4;
}

.proof-node {
    position: absolute;
    left: -34px;
    top: 32px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--kaki);
    z-index: 2;
}

.derivation-column .block {
    margin-bottom: var(--ma-space);
    position: relative;
}

/* --- Gate IV — The Garden --- */
.gate-iv {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-bottom: 80px;
}

.logic-tree-illustration {
    width: 100%;
    max-width: 60vw;
    margin: 0 auto;
}

.svg-logic-tree {
    width: 100%;
    height: auto;
}

.garden-caption {
    text-align: center;
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: 1rem;
    color: var(--hai);
    margin-top: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.yojo {
    text-align: center;
    background: transparent;
    border: none;
}

.yojo:hover {
    border-color: transparent;
}

/* --- Gate V — The Theorem --- */
.gate-v {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-bottom: 80px;
}

.theorem-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.theorem-block {
    background: transparent;
    border: none;
    padding: 60px 40px;
}

.theorem-block:hover {
    border-color: transparent;
}

.theorem-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(3.2rem, 8vw, 7rem);
    letter-spacing: 0.04em;
    line-height: 1.15;
    color: var(--sumi);
    margin-bottom: 32px;
}

.theorem-body {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1.3vw, 1.2rem);
    line-height: 1.85;
    color: var(--sumi);
    margin-bottom: 40px;
}

.theorem-symbol {
    margin: 32px 0;
}

.theorem-final {
    font-size: 3rem;
    color: var(--kaki);
}

.theorem-coda {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    letter-spacing: 0.04em;
    color: var(--hai);
    margin-top: 24px;
}

/* --- SVG Botanical Illustrations — Path Drawing --- */
.svg-botanical {
    width: 100%;
    height: auto;
    overflow: visible;
}

.draw-path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 2.5s cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

.svg-botanical.drawing .draw-path {
    stroke-dashoffset: 0;
}

/* Stagger the path drawing */
.svg-botanical.drawing .draw-path:nth-child(1) { transition-delay: 0ms; }
.svg-botanical.drawing .draw-path:nth-child(2) { transition-delay: 80ms; }
.svg-botanical.drawing .draw-path:nth-child(3) { transition-delay: 160ms; }
.svg-botanical.drawing .draw-path:nth-child(4) { transition-delay: 240ms; }
.svg-botanical.drawing .draw-path:nth-child(5) { transition-delay: 320ms; }
.svg-botanical.drawing .draw-path:nth-child(6) { transition-delay: 400ms; }
.svg-botanical.drawing .draw-path:nth-child(7) { transition-delay: 480ms; }
.svg-botanical.drawing .draw-path:nth-child(8) { transition-delay: 560ms; }
.svg-botanical.drawing .draw-path:nth-child(9) { transition-delay: 640ms; }
.svg-botanical.drawing .draw-path:nth-child(10) { transition-delay: 720ms; }
.svg-botanical.drawing .draw-path:nth-child(11) { transition-delay: 800ms; }
.svg-botanical.drawing .draw-path:nth-child(12) { transition-delay: 880ms; }
.svg-botanical.drawing .draw-path:nth-child(13) { transition-delay: 960ms; }
.svg-botanical.drawing .draw-path:nth-child(14) { transition-delay: 1040ms; }
.svg-botanical.drawing .draw-path:nth-child(15) { transition-delay: 1120ms; }
.svg-botanical.drawing .draw-path:nth-child(16) { transition-delay: 1200ms; }
.svg-botanical.drawing .draw-path:nth-child(17) { transition-delay: 1280ms; }
.svg-botanical.drawing .draw-path:nth-child(18) { transition-delay: 1360ms; }
.svg-botanical.drawing .draw-path:nth-child(19) { transition-delay: 1440ms; }
.svg-botanical.drawing .draw-path:nth-child(20) { transition-delay: 1520ms; }

.symbol-label {
    opacity: 0;
    transition: opacity 0.5s ease 2.5s;
}

.svg-botanical.drawing .symbol-label {
    opacity: 1;
}

.fruit-fill {
    opacity: 0;
    transition: opacity 0.8s ease 2s;
}

.svg-botanical.drawing .fruit-fill {
    opacity: 0.3;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    .draw-path {
        stroke-dasharray: none;
        stroke-dashoffset: 0;
        transition: none;
    }

    .symbol-label,
    .fruit-fill {
        opacity: 1;
        transition: none;
    }

    .skeleton-line {
        animation: none;
    }

    .block-content {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .skeleton-placeholder {
        display: none;
    }

    .divider-line {
        width: 40vw;
        transition: none;
    }

    .logic-symbol:hover {
        transform: none;
    }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --ma-space: 32px;
        --gutter: 20px;
    }

    .axiom-cluster {
        grid-template-columns: 1fr;
    }

    .fern-illustration {
        display: none;
    }

    .derivation-column {
        padding-left: 30px;
    }

    .proof-line {
        left: 8px;
    }

    .proof-node {
        left: -27px;
    }

    .logic-tree-illustration {
        max-width: 90vw;
    }

    .gate-header {
        padding-top: 60px;
    }
}

@media (max-width: 480px) {
    .gate-title {
        font-size: clamp(2.4rem, 12vw, 4rem);
    }

    .gate-heading {
        font-size: clamp(1.6rem, 6vw, 2.4rem);
    }

    .theorem-heading {
        font-size: clamp(2.4rem, 12vw, 4rem);
    }

    .block {
        padding: 24px 20px;
    }

    .persimmon-branch {
        max-width: 180px;
    }
}