/* ==========================================================================
   daitoua.quest — Terminal-meets-Scholarly Stylesheet
   Palette: Sunset Over the Pacific (太平洋の夕暮れ)
   Compliance language: "IBM Plex Mono" (Google Fonts Interface (端末
   IntersectionObserver calling `.play( IntersectionObserver` trigger entry animations. `opacity:
   ========================================================================== */

:root {
    --sumi:        #1a1712; /* 墨  terminal / overlay */
    --washi:       #f5ecd7; /* 和紙 parchment */
    --kohaku:      #c4956a; /* 琥珀 amber glow */
    --beni:        #8b2500; /* 紅  imperial crimson */
    --kin:         #d4a017; /* 金  sunset gold */
    --umi:         #3d5a6e; /* 海  sea slate */
    --matsu:       #2d4a3a; /* 松  forest dark */
    --furubi:      #e8dcc6; /* 古び aged paper */
    --sumi-iro:    #33291f; /* 墨色 primary text */

    --font-display: 'Cormorant Garamond', 'Noto Serif JP', Georgia, serif;
    --font-body:    'Crimson Pro', 'Noto Serif JP', Georgia, serif;
    --font-mono:    'IBM Plex Mono', 'Courier New', monospace;
    --font-jp:      'Noto Serif JP', 'Cormorant Garamond', serif;

    --console-h:   48px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--washi);
    color: var(--sumi-iro);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.75;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(ellipse at 20% 10%, rgba(196, 149, 106, 0.08), transparent 60%),
        radial-gradient(ellipse at 80% 60%, rgba(139, 37, 0, 0.05), transparent 55%),
        repeating-linear-gradient(45deg,
            transparent 0px, transparent 3px,
            rgba(232, 220, 198, 0.45) 3px, rgba(232, 220, 198, 0.45) 4px),
        var(--washi);
    min-height: 100vh;
    scroll-snap-type: y proximity;
}

/* ==========================================================================
   Console Header
   ========================================================================== */
.console-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--console-h);
    background: var(--sumi);
    color: var(--kohaku);
    z-index: 100;
    border-bottom: 1px solid rgba(196, 149, 106, 0.4);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
    font-family: var(--font-mono);
    font-size: 13px;
}

.console-inner {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 24px;
}

.console-prompt {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--kohaku);
    flex-shrink: 0;
}

.prompt-host { color: var(--kin); font-weight: 500; }
.prompt-sep  { color: var(--kohaku); opacity: 0.7; }
.prompt-command {
    color: var(--washi);
    opacity: 0.9;
}
.prompt-cursor {
    display: inline-block;
    width: 8px;
    background: var(--kohaku);
    color: var(--kohaku);
    margin-left: 4px;
    animation: blink 1s step-end infinite;
    text-shadow: 0 0 6px var(--kohaku);
}
@keyframes blink {
    0%, 50% { opacity: 1; }
    50.01%, 100% { opacity: 0; }
}

.console-nav {
    display: flex;
    gap: 14px;
    flex: 1;
    justify-content: center;
    font-family: var(--font-mono);
}

.nav-item {
    color: var(--kohaku);
    text-decoration: none;
    padding: 4px 6px;
    position: relative;
    letter-spacing: 0.05em;
    transition: color 0.2s ease, border-color 0.2s ease;
    font-size: 13px;
}
.nav-item::before { content: '['; color: var(--umi); margin-right: 2px; }
.nav-item::after  { content: ']'; color: var(--umi); margin-left: 2px; }
.nav-item:hover   { color: var(--washi); }
.nav-item.active  {
    color: var(--kin);
    border-bottom: 1px solid var(--kin);
}

.console-status {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    color: var(--furubi);
    font-size: 11px;
    letter-spacing: 0.08em;
    opacity: 0.85;
}

.status-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--kin);
    box-shadow: 0 0 8px var(--kin);
    animation: dot-pulse 2s ease-in-out infinite;
}
@keyframes dot-pulse {
    0%, 100% { box-shadow: 0 0 4px var(--kin); }
    50%      { box-shadow: 0 0 12px var(--kin); }
}

/* ==========================================================================
   Opening Scroll
   ========================================================================== */
.opening-scroll {
    position: relative;
    min-height: 100vh;
    padding-top: calc(var(--console-h) + 40px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    scroll-snap-align: start;
}

.scroll-backdrop {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 50% 40%, rgba(212, 160, 23, 0.08), transparent 60%),
        radial-gradient(circle at 50% 90%, rgba(26, 23, 18, 0.12), transparent 50%);
    pointer-events: none;
}

.scroll-rod {
    width: min(760px, 90vw);
    height: 18px;
    background:
        linear-gradient(180deg,
            #5a3a22 0%,
            #8b5a2b 30%,
            #c4956a 60%,
            #8b5a2b 80%,
            #5a3a22 100%);
    border-radius: 9px;
    box-shadow: 0 2px 6px rgba(26, 23, 18, 0.35), inset 0 0 4px rgba(26, 23, 18, 0.4);
    position: relative;
}
.scroll-rod::before, .scroll-rod::after {
    content: '';
    position: absolute;
    top: -6px; bottom: -6px;
    width: 24px;
    background: radial-gradient(circle, #c4956a 0%, #5a3a22 85%);
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(26, 23, 18, 0.4);
}
.scroll-rod::before { left: -18px; }
.scroll-rod::after  { right: -18px; }

.scroll-parchment {
    width: min(760px, 90vw);
    background:
        repeating-linear-gradient(45deg,
            transparent 0, transparent 3px,
            rgba(139, 37, 0, 0.03) 3px, rgba(139, 37, 0, 0.03) 4px),
        linear-gradient(180deg, var(--washi) 0%, var(--furubi) 100%);
    padding: 64px 56px 80px;
    position: relative;
    transform-origin: top center;
    transform: scaleY(0);
    animation: unroll 2s cubic-bezier(0.22, 1, 0.36, 1) 0.4s forwards;
    box-shadow:
        inset 0 0 40px rgba(139, 37, 0, 0.06),
        0 20px 60px rgba(26, 23, 18, 0.25);
    border-left: 1px solid rgba(139, 37, 0, 0.15);
    border-right: 1px solid rgba(139, 37, 0, 0.15);
}

@keyframes unroll {
    0%   { transform: scaleY(0); opacity: 0; }
    10%  { opacity: 1; }
    100% { transform: scaleY(1); opacity: 1; }
}

.scroll-parchment::before,
.scroll-parchment::after {
    content: '';
    position: absolute;
    left: 0; right: 0;
    height: 22px;
    pointer-events: none;
}
.scroll-parchment::before {
    top: 0;
    background: linear-gradient(180deg, rgba(26, 23, 18, 0.22), transparent);
}
.scroll-parchment::after {
    bottom: 0;
    background: linear-gradient(0deg, rgba(26, 23, 18, 0.22), transparent);
}

.scroll-inner {
    opacity: 0;
    animation: scroll-fade-in 0.8s ease 2.2s forwards;
    text-align: center;
}
@keyframes scroll-fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.scroll-classification {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--beni);
    border: 1px solid var(--beni);
    display: inline-block;
    padding: 4px 12px;
    opacity: 0.7;
    margin-bottom: 28px;
}

.scroll-title {
    font-family: var(--font-display);
    margin: 0;
    font-weight: 700;
    font-size: clamp(4.8rem, 14vw, 11rem);
    line-height: 0.95;
    letter-spacing: 0.04em;
    color: var(--sumi-iro);
    text-shadow: 3px 3px 0 rgba(232, 220, 198, 0.6);
}

.title-kanji {
    font-family: var(--font-jp);
    display: inline-block;
    background: linear-gradient(180deg, var(--sumi-iro) 0%, var(--beni) 100%);
    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
}

.scroll-romaji {
    font-family: var(--font-mono);
    letter-spacing: 0.6em;
    font-size: 13px;
    color: var(--umi);
    text-transform: lowercase;
    margin: 18px 0 26px;
}

.scroll-rule {
    width: 140px;
    height: 1px;
    margin: 24px auto;
    background: var(--kin);
    position: relative;
}
.scroll-rule::before {
    content: '';
    position: absolute;
    left: 50%; top: 50%;
    width: 8px; height: 8px;
    background: var(--kin);
    transform: translate(-50%, -50%) rotate(45deg);
}

.scroll-subtitle {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2.2vw, 1.5rem);
    font-weight: 500;
    font-style: italic;
    margin: 6px 0 10px;
    color: var(--sumi-iro);
}

.scroll-period {
    font-family: var(--font-jp);
    font-size: 1rem;
    color: var(--umi);
    letter-spacing: 0.1em;
    margin: 0;
}

.scroll-hanko {
    position: absolute;
    right: 40px;
    bottom: 40px;
    width: 74px; height: 74px;
    border: 2.5px solid var(--beni);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-14deg);
    opacity: 0;
    animation: hanko-stamp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) 3s forwards;
}
.scroll-hanko::before {
    content: '';
    position: absolute;
    inset: 4px;
    border: 1px solid var(--beni);
    border-radius: 50%;
    opacity: 0.55;
}
.hanko-text {
    font-family: var(--font-jp);
    color: var(--beni);
    font-weight: 700;
    font-size: 22px;
    letter-spacing: 0.05em;
}

@keyframes hanko-stamp {
    0%   { opacity: 0; transform: rotate(-14deg) scale(3); }
    60%  { opacity: 0.85; transform: rotate(-14deg) scale(0.92); }
    100% { opacity: 0.75; transform: rotate(-14deg) scale(1); }
}

.scroll-hint {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    opacity: 0;
    animation: hint-fade 0.8s ease 3.4s forwards;
    color: var(--umi);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}
.hint-arrow {
    font-size: 16px;
    color: var(--kin);
    animation: hint-bounce 1.8s ease-in-out infinite;
}
@keyframes hint-fade {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 0.85; transform: translateY(0); }
}
@keyframes hint-bounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(8px); }
}

/* ==========================================================================
   Research Desk
   ========================================================================== */
.research-desk {
    max-width: 1400px;
    margin: 0 auto;
    padding: 80px 40px 40px;
    position: relative;
}

.desk-intro, .archive-drawer, .terminal-log {
    scroll-snap-align: start;
    padding: 40px 0 20px;
    max-width: 980px;
    margin: 0 auto;
}

.section-numeral {
    font-family: var(--font-display);
    font-size: 3.6rem;
    line-height: 1;
    color: var(--kin);
    opacity: 0.75;
    margin-bottom: 8px;
}

.section-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    margin: 0 0 6px;
    color: var(--sumi-iro);
    letter-spacing: 0.01em;
}

.section-sub {
    font-family: var(--font-jp);
    color: var(--umi);
    margin: 0 0 14px;
    letter-spacing: 0.06em;
    font-size: 0.95rem;
    font-style: italic;
}

.diamond-rule {
    position: relative;
    height: 1px;
    width: 100%;
    background: linear-gradient(90deg,
        transparent 0%, var(--kin) 20%, var(--kin) 80%, transparent 100%);
    margin: 22px 0 28px;
}
.diamond-rule .diamond {
    position: absolute;
    left: 50%; top: 50%;
    width: 10px; height: 10px;
    background: var(--kin);
    transform: translate(-50%, -50%) rotate(45deg);
    box-shadow: 0 0 8px rgba(212, 160, 23, 0.35);
}

.section-lede {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--sumi-iro);
    max-width: 740px;
}
.section-lede::first-letter {
    font-family: var(--font-display);
    font-weight: 700;
    float: left;
    font-size: 4em;
    line-height: 0.9;
    padding: 0.1em 0.12em 0 0;
    color: var(--beni);
    text-shadow: 2px 2px 0 var(--furubi);
}

/* ==========================================================================
   Topic Cards
   ========================================================================== */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 32px 28px;
    margin-top: 48px;
    position: relative;
}

.card {
    grid-column: span 2;
    background: var(--washi);
    padding: 32px 28px 40px;
    border-left: 3px solid var(--kin);
    box-shadow:
        4px 4px 0 var(--furubi),
        6px 8px 18px rgba(26, 23, 18, 0.12);
    position: relative;
    transform: rotate(var(--card-tilt, 0));
    transition: transform 0.35s ease, box-shadow 0.35s ease, opacity 0.6s ease;
    clip-path: polygon(
        0 0, 100% 0, 100% calc(100% - 14px),
        96% 100%, 86% calc(100% - 6px),
        74% 100%, 62% calc(100% - 8px),
        48% 100%, 36% calc(100% - 4px),
        24% 100%, 12% calc(100% - 10px),
        0 calc(100% - 2px)
    );
    color: var(--sumi-iro);
    opacity: 0;
    transform-origin: top center;
    will-change: transform, opacity;
}

.card.card-wide { grid-column: span 3; }
.card.card-map  { grid-column: span 6; }

.card.reveal {
    opacity: 1;
    animation: card-enter 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
    animation-delay: calc(var(--card-index, 0) * 80ms);
}

@keyframes card-enter {
    0%   { opacity: 0; transform: translateY(36px) rotate(var(--card-tilt, 0)); }
    100% { opacity: 1; transform: translateY(0)    rotate(var(--card-tilt, 0)); }
}

.card:hover {
    transform: rotate(0deg) translateY(-3px);
    box-shadow:
        6px 6px 0 var(--furubi),
        10px 14px 28px rgba(26, 23, 18, 0.18);
    z-index: 3;
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 18px;
    padding-bottom: 16px;
    border-bottom: 1px dashed rgba(139, 37, 0, 0.25);
}

.card-icon {
    width: 56px; height: 56px;
    stroke: var(--kohaku);
    flex-shrink: 0;
    stroke-dasharray: 240;
    stroke-dashoffset: 240;
    transition: stroke-dashoffset 0.9s ease-out 0.15s, stroke 0.3s ease;
}

.card.reveal .card-icon {
    stroke-dashoffset: 0;
}

.card:hover .card-icon {
    stroke: var(--beni);
}

.card-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.card-code {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    color: var(--beni);
    opacity: 0.85;
}

.card-date {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--umi);
    letter-spacing: 0.08em;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.55rem;
    line-height: 1.15;
    margin: 0 0 6px;
    color: var(--sumi-iro);
    letter-spacing: 0.005em;
}

.card-jp {
    font-family: var(--font-jp);
    color: var(--umi);
    margin: 0 0 16px;
    font-size: 0.95rem;
    letter-spacing: 0.05em;
}
.card-jp .ruby {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--matsu);
    margin-left: 4px;
    letter-spacing: 0.1em;
}

.card-body {
    font-family: var(--font-body);
    color: var(--sumi-iro);
    font-size: 1rem;
    margin: 0 0 14px;
}

.card-significance {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.92rem;
    color: var(--matsu);
    padding: 10px 14px;
    margin: 16px 0 0;
    border-left: 2px solid var(--kin);
    background: linear-gradient(90deg, rgba(212, 160, 23, 0.08), transparent 90%);
}
.card-significance::before {
    content: '※ ';
    color: var(--beni);
    font-weight: 600;
}

.torn-edge {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 14px;
    background:
        radial-gradient(circle at 8% 0%, transparent 4px, var(--washi) 4.5px) top left / 40px 14px repeat-x;
    opacity: 0.4;
    pointer-events: none;
}

/* Hanko stamps on cards */
.card-hanko {
    position: absolute;
    right: 20px;
    top: 20px;
    width: 62px; height: 62px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-jp);
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 0.04em;
    transform: rotate(-12deg);
    opacity: 0.6;
    pointer-events: none;
}
.card-hanko::before {
    content: '';
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    border: 1px solid currentColor;
    opacity: 0.55;
}
.hanko-red,
.hanko-crimson {
    color: var(--beni);
    border: 2px solid var(--beni);
}
.hanko-crimson {
    transform: rotate(8deg);
}

/* Pacific map frame */
.map-frame {
    margin: 12px 0 18px;
    background:
        linear-gradient(180deg, rgba(61, 90, 110, 0.08), rgba(61, 90, 110, 0.04)),
        var(--furubi);
    border: 1px solid rgba(61, 90, 110, 0.3);
    padding: 14px;
    position: relative;
}
.map-frame::before {
    content: 'fig. 001 · 太平洋戦域概図';
    position: absolute;
    top: -8px; left: 14px;
    background: var(--washi);
    padding: 0 8px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--umi);
}
.pacific-map {
    width: 100%;
    height: auto;
    display: block;
}
.route-line {
    stroke-dashoffset: 0;
    animation: route-march 14s linear infinite;
}
@keyframes route-march {
    from { stroke-dashoffset: 0; }
    to   { stroke-dashoffset: -140; }
}

.compass-icon { transition: transform 1.6s cubic-bezier(0.33, 1.56, 0.64, 1); }
.compass-icon.spin { transform: rotate(405deg); }

/* ==========================================================================
   Archive Drawer
   ========================================================================== */
.archive-drawer {
    margin-top: 100px;
}

.drawer-list {
    list-style: none;
    padding: 0;
    margin: 40px 0 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-top: 2px solid var(--sumi-iro);
    border-bottom: 2px solid var(--sumi-iro);
    padding: 18px 0;
    background:
        repeating-linear-gradient(0deg,
            transparent 0, transparent 39px,
            rgba(139, 37, 0, 0.06) 39px, rgba(139, 37, 0, 0.06) 40px);
}

.drawer-card {
    display: grid;
    grid-template-columns: 90px 1fr 140px 90px 20px;
    align-items: center;
    gap: 18px;
    padding: 14px 20px 14px 26px;
    background: var(--washi);
    border-left: 4px solid var(--beni);
    border-radius: 4px 0 0 4px;
    box-shadow: 2px 2px 0 var(--furubi);
    cursor: pointer;
    position: relative;
    transform: translateX(0);
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease, background 0.3s ease;
}

.drawer-card:hover {
    transform: translateX(20px);
    background: linear-gradient(90deg, var(--furubi), var(--washi) 60%);
    box-shadow: 6px 6px 0 var(--furubi), 10px 4px 20px rgba(26, 23, 18, 0.12);
}

.drawer-code {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--beni);
    letter-spacing: 0.08em;
    font-weight: 500;
}

.drawer-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--sumi-iro);
}

.drawer-years {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--umi);
    letter-spacing: 0.08em;
}

.drawer-count {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--matsu);
    text-align: right;
    opacity: 0.85;
}

.drawer-tab {
    position: absolute;
    right: -1px;
    top: 50%;
    width: 14px; height: 32px;
    transform: translateY(-50%);
    background: var(--kin);
    clip-path: polygon(0 0, 100% 25%, 100% 75%, 0 100%);
    opacity: 0.9;
    transition: background 0.3s ease;
}
.drawer-card:hover .drawer-tab { background: var(--beni); }

/* ==========================================================================
   Terminal Session Log
   ========================================================================== */
.terminal-log {
    margin-top: 100px;
}

.log-frame {
    background: var(--sumi);
    color: var(--kohaku);
    border: 1px solid rgba(196, 149, 106, 0.35);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 13px;
    margin-top: 40px;
    overflow: hidden;
    box-shadow:
        0 0 0 1px rgba(212, 160, 23, 0.15),
        0 20px 40px rgba(26, 23, 18, 0.3);
}

.log-header {
    background: rgba(196, 149, 106, 0.08);
    padding: 10px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(196, 149, 106, 0.25);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--furubi);
}

.log-dot {
    width: 8px; height: 8px;
    background: var(--kin);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--kin);
}

.log-body {
    padding: 16px 22px 22px;
    max-height: 360px;
    overflow: hidden;
    position: relative;
    background:
        repeating-linear-gradient(0deg,
            rgba(196, 149, 106, 0.04) 0, rgba(196, 149, 106, 0.04) 1px,
            transparent 1px, transparent 3px),
        var(--sumi);
}

.log-line {
    margin: 4px 0;
    line-height: 1.6;
    color: var(--furubi);
    letter-spacing: 0.03em;
    text-shadow: 0 0 4px rgba(196, 149, 106, 0.18);
}

.log-ts  { color: var(--umi); margin-right: 8px; }
.log-tag { color: var(--kin); margin-right: 10px; }

.log-live { color: var(--kohaku); }
.log-caret {
    display: inline-block;
    width: 7px;
    color: var(--kohaku);
    margin-left: 2px;
    animation: blink 1s step-end infinite;
    text-shadow: 0 0 6px var(--kohaku);
}

/* ==========================================================================
   Colophon
   ========================================================================== */
.colophon {
    margin-top: 120px;
    padding: 40px 40px 80px;
    background: var(--washi);
    border-top: 1px solid rgba(139, 37, 0, 0.3);
    scroll-snap-align: start;
}

.colophon-rule {
    width: 140px;
    height: 1px;
    background: var(--sumi-iro);
    margin: 10px auto 30px;
    position: relative;
}
.colophon-rule::before {
    content: '';
    position: absolute;
    left: 50%; top: 50%;
    width: 6px; height: 6px;
    background: var(--sumi-iro);
    transform: translate(-50%, -50%) rotate(45deg);
}

.colophon-inner {
    max-width: 620px;
    margin: 0 auto;
    text-align: center;
}

.colophon-jp {
    font-family: var(--font-jp);
    color: var(--umi);
    letter-spacing: 0.5em;
    font-size: 0.85rem;
    margin: 0 0 12px;
    text-indent: 0.5em;
}

.colophon-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    margin: 0 0 6px;
    color: var(--sumi-iro);
}

.colophon-sub {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--sumi-iro);
    margin: 0 0 30px;
    font-size: 1rem;
}

.colophon-meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 0 0 30px;
    padding: 0;
    text-align: left;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
}

.meta-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 16px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 4px 0;
    border-bottom: 1px dotted rgba(51, 41, 31, 0.3);
}
.meta-row dt {
    font-family: var(--font-jp);
    color: var(--beni);
    font-weight: 500;
    letter-spacing: 0.12em;
}
.meta-row dd {
    margin: 0;
    color: var(--sumi-iro);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.colophon-note {
    font-family: var(--font-body);
    font-size: 0.92rem;
    color: var(--matsu);
    font-style: italic;
    max-width: 560px;
    margin: 0 auto 30px;
}

.colophon-sig {
    font-family: var(--font-jp);
    color: var(--umi);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    margin: 20px 0 0;
    opacity: 0.85;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
    .topic-grid { grid-template-columns: repeat(4, 1fr); }
    .card { grid-column: span 2; }
    .card.card-wide { grid-column: span 4; }
    .card.card-map  { grid-column: span 4; }
    .console-inner { gap: 16px; padding: 0 16px; }
    .console-nav { gap: 10px; }
}

@media (max-width: 768px) {
    body { font-size: 16px; }
    .research-desk { padding: 60px 20px 20px; }
    .topic-grid { grid-template-columns: 1fr; gap: 28px; margin-top: 36px; }
    .card { grid-column: span 1 !important; transform: none !important; }
    .card.reveal { animation: card-enter-mobile 0.7s ease both; }
    @keyframes card-enter-mobile {
        from { opacity: 0; transform: translateY(20px); }
        to   { opacity: 1; transform: translateY(0); }
    }
    .card:hover { transform: translateY(-2px) !important; }

    .console-inner { padding: 0 10px; gap: 10px; }
    .prompt-command { display: none; }
    .console-status { display: none; }
    .nav-item { font-size: 12px; padding: 4px; }
    .nav-item .nav-full { display: none; }

    .scroll-parchment { padding: 40px 28px 60px; }
    .scroll-hanko { right: 16px; bottom: 16px; width: 58px; height: 58px; }
    .hanko-text { font-size: 16px; }

    .drawer-card {
        grid-template-columns: 70px 1fr;
        grid-template-rows: auto auto;
        gap: 4px 14px;
    }
    .drawer-years, .drawer-count {
        grid-column: 2;
        text-align: left;
    }
    .drawer-card:hover { transform: translateX(10px); }

    .colophon { padding: 40px 20px 60px; }
    .meta-row { grid-template-columns: 80px 1fr; }
}

@media (max-width: 480px) {
    .scroll-title { font-size: 4.5rem; }
    .section-heading { font-size: 2rem; }
    .section-numeral { font-size: 2.8rem; }
    .log-body { padding: 12px 14px; font-size: 11px; }
    .log-ts, .log-tag { font-size: 10px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001s !important;
        animation-delay: 0s !important;
        transition-duration: 0.001s !important;
    }
    .scroll-parchment { transform: scaleY(1); }
    .scroll-inner { opacity: 1; }
    .scroll-hanko, .scroll-hint { opacity: 0.7; }
}