/**
 * MetriX Design System
 * Inspired by i3DESIGN — clean editorial, warm neutrals, red accent
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;600;700&display=swap');

:root {
    /* Brand
       アクセントの赤はロゴの赤（DSMetriX の "DS"）。3トラックのロゴとも
       同じ #ac2317 で、画像から採った実測値。以前の #e60012 はロゴより明るく、
       ロゴと同じ画面に2種類の赤が並んでいたので、こちらへ寄せた。
       赤はここだけで定義する（画面側に literal を置かない）。 */
    --dx-accent: #ac2317;
    --dx-accent-hover: #8f1d13;
    --dx-accent-soft: #fff0f1;

    /* Neutrals */
    --dx-bg: #ffffff;
    --dx-bg-warm: #f7f7f2;
    --dx-bg-muted: #f0f0eb;
    --dx-surface: #ffffff;
    --dx-border: #e8e8e3;
    --dx-border-strong: #d4d4cf;

    /* Text */
    --dx-text: #1a1a1a;
    --dx-text-secondary: #666666;
    --dx-text-muted: #999999;
    --dx-text-inverse: #ffffff;

    /* Typography */
    --dx-font: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --dx-font-mono: 'SF Mono', 'Monaco', 'Consolas', monospace;

    /* Spacing & shape */
    --dx-radius-sm: 2px;
    --dx-radius: 4px;
    --dx-radius-lg: 8px;
    --dx-shadow-sm: 0 1px 2px rgba(26, 26, 26, 0.04);
    --dx-shadow: 0 4px 24px rgba(26, 26, 26, 0.06);
    --dx-shadow-hover: 0 8px 32px rgba(26, 26, 26, 0.1);
    --dx-max-width: 1120px;
    --dx-header-height: 64px;

    /* Legacy aliases (styles.css compatibility) */
    --primary-color: var(--dx-text);
    --secondary-color: var(--dx-accent);
    --background-color: var(--dx-bg-warm);
    --text-color: var(--dx-text);
    --border-color: var(--dx-border);
    --hover-color: var(--dx-bg-muted);
}

/* ── Base ── */

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--dx-font);
    font-size: 15px;
    line-height: 1.75;
    color: var(--dx-text);
    background-color: var(--dx-bg-warm);
    margin: 0;
    padding: 0;
}

h1, h2, h3, h4 {
    font-family: var(--dx-font);
    color: var(--dx-text);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.35;
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    text-align: left;
    margin-bottom: 1rem;
    border: none;
    padding: 0;
}

h2 {
    font-size: 1.25rem;
    border: none;
    padding: 0;
    margin-bottom: 1rem;
}

a {
    color: var(--dx-text);
    transition: color 0.15s ease;
}

a:hover {
    color: var(--dx-accent);
}

/* ── Site header ── */

.site-header,
.admin-nav {
    background: var(--dx-bg);
    border-bottom: 1px solid var(--dx-border);
    padding: 0;
    margin-bottom: 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header-inner,
.nav-container {
    max-width: var(--dx-max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: var(--dx-header-height);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.25rem 0.5rem;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    margin-right: 1.5rem;
    line-height: 0;
    white-space: nowrap;
}

.site-brand:hover {
    opacity: 0.85;
}

.site-brand-logo {
    display: block;
    height: 28px;
    width: auto;
}

.home-brand-logo {
    display: block;
    width: min(280px, 70%);
    height: auto;
    margin: 0 0 1rem;
}

.login-brand-logo {
    display: block;
    width: min(220px, 80%);
    height: auto;
    margin: 0 auto 1rem;
}

.site-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.125rem;
}

.nav-link {
    color: var(--dx-text-secondary);
    text-decoration: none;
    padding: 0.4rem 0.65rem;
    white-space: nowrap;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--dx-radius-sm);
    transition: color 0.15s, background 0.15s;
}

.nav-link:hover {
    color: var(--dx-text);
    background: var(--dx-bg-warm);
}

.nav-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-right .text-white,
.nav-right span {
    color: var(--dx-text-secondary) !important;
    font-size: 0.8125rem;
}

/* ── ヘッダーのプルダウン（JS なし。details/summary で開閉する） ── */

.nav-menu {
    position: relative;
}

.nav-menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    list-style: none;
    max-width: 16rem;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-menu-trigger::-webkit-details-marker {
    display: none;
}

.nav-menu-trigger::after {
    content: "▾";
    font-size: 0.7rem;
    color: var(--dx-text-muted, var(--dx-text-secondary));
}

.nav-menu[open] > .nav-menu-trigger {
    color: var(--dx-text);
    background: var(--dx-bg-warm);
}

.nav-menu-panel {
    position: absolute;
    top: calc(100% + 0.35rem);
    left: 0;
    z-index: 50;
    min-width: 12rem;
    padding: 0.35rem;
    background: var(--dx-bg, #fff);
    border: 1px solid var(--dx-border, #e5e7eb);
    border-radius: var(--dx-radius-sm);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
}

.nav-menu-panel-right {
    left: auto;
    right: 0;
}

.nav-menu-title {
    margin: 0.35rem 0 0.15rem;
    padding: 0 0.55rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--dx-text-secondary);
}

.nav-menu-title:first-child {
    margin-top: 0.15rem;
}

.nav-menu-item {
    display: block;
    padding: 0.4rem 0.55rem;
    font-size: 0.8125rem;
    color: var(--dx-text);
    text-decoration: none;
    border-radius: var(--dx-radius-sm);
    white-space: nowrap;
}

.nav-menu-item:hover {
    background: var(--dx-bg-warm);
}

/* ── Buttons ── */

.btn-primary,
.aid-btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.5rem;
    font-family: var(--dx-font);
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--dx-text-inverse);
    background: var(--dx-text);
    border: 1px solid var(--dx-text);
    border-radius: var(--dx-radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.btn-primary:hover,
.aid-btn-primary:hover {
    background: #333333;
    border-color: #333333;
    color: var(--dx-text-inverse);
    transform: translateY(-1px);
}

.btn-secondary,
.aid-btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.5rem;
    font-family: var(--dx-font);
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--dx-text);
    background: transparent;
    border: 1px solid var(--dx-border-strong);
    border-radius: var(--dx-radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: border-color 0.15s, background 0.15s;
}

.btn-secondary:hover,
.aid-btn-secondary:hover {
    border-color: var(--dx-text);
    background: var(--dx-bg-warm);
    color: var(--dx-text);
}

.btn-accent {
    background: var(--dx-accent);
    border-color: var(--dx-accent);
    color: var(--dx-text-inverse);
}

.btn-accent:hover {
    background: var(--dx-accent-hover);
    border-color: var(--dx-accent-hover);
    color: var(--dx-text-inverse);
}

/* ── Layout primitives ── */

.dx-page {
    max-width: var(--dx-max-width);
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.dx-breadcrumb {
    font-size: 0.75rem;
    color: var(--dx-text-muted);
    margin-bottom: 2rem;
    letter-spacing: 0.02em;
}

.dx-breadcrumb a {
    color: var(--dx-text-secondary);
    text-decoration: none;
}

.dx-breadcrumb a:hover {
    color: var(--dx-accent);
}

.dx-breadcrumb span {
    margin: 0 0.4rem;
}

.dx-eyebrow {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--dx-accent);
    margin-bottom: 0.75rem;
}

.dx-hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 3.5rem;
    padding: 3rem 0;
    border-bottom: 1px solid var(--dx-border);
}

@media (min-width: 768px) {
    .dx-hero--split {
        grid-template-columns: 1fr 1fr;
        align-items: center;
        gap: 3rem;
    }
}

.dx-hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin: 0 0 1.25rem;
    color: var(--dx-text);
}

.dx-hero-lead {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--dx-text-secondary);
    margin: 0 0 1.5rem;
    max-width: 36em;
}

/* ヒーロー下の導線ボタン。現状は公開ランディング landing.html でのみ使用。 */
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.dx-hero-visual {
    background: var(--dx-bg-muted);
    border: 1px solid var(--dx-border);
    min-height: 240px;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    position: relative;
    overflow: hidden;
}

.dx-hero-visual::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    background: var(--dx-accent);
    z-index: 1;
}

.dx-hero-visual-art {
    display: block;
    width: 100%;
    height: auto;
    min-height: 240px;
}

@media (prefers-reduced-motion: no-preference) {
    .dx-hero-drift-a {
        animation: dx-hero-drift-a 7s ease-in-out infinite alternate;
    }
    .dx-hero-drift-b {
        animation: dx-hero-drift-b 9s ease-in-out infinite alternate;
    }
    .dx-hero-drift-c {
        animation: dx-hero-drift-c 6s ease-in-out infinite alternate;
    }
    .dx-hero-align {
        animation: dx-hero-align-in 1.2s ease-out both;
    }
    .dx-hero-guides {
        animation: dx-hero-guides-in 1s ease-out both;
    }
    .dx-hero-metric {
        animation: dx-hero-metric-pulse 3.2s ease-in-out infinite;
    }
}

@keyframes dx-hero-drift-a {
    from { transform: translate(0, 0); }
    to { transform: translate(6px, -4px); }
}

@keyframes dx-hero-drift-b {
    from { transform: translate(0, 0); }
    to { transform: translate(-5px, 5px); }
}

@keyframes dx-hero-drift-c {
    from { transform: translate(0, 0); }
    to { transform: translate(10px, -2px); }
}

@keyframes dx-hero-align-in {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes dx-hero-guides-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes dx-hero-metric-pulse {
    0%, 100% { opacity: 0.85; }
    50% { opacity: 1; }
}

.dx-hero-visual-inner {
    padding: 2rem;
    text-align: center;
    color: var(--dx-text-muted);
    font-size: 0.875rem;
}

.dx-section {
    margin-bottom: 3.5rem;
}

.dx-section-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--dx-border);
}

.dx-section-title {
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--dx-text-muted);
    margin: 0 0 0.35rem;
    border: none;
    padding: 0;
}

.dx-section-heading {
    font-size: 1.375rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.02em;
}

.dx-section-desc {
    font-size: 0.875rem;
    color: var(--dx-text-secondary);
    margin: 0.5rem 0 0;
    line-height: 1.7;
}

/* ── Cards ── */

.dx-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1px;
    background: var(--dx-border);
    border: 1px solid var(--dx-border);
}

.dx-card {
    display: block;
    background: var(--dx-surface);
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: background 0.2s, box-shadow 0.2s;
    position: relative;
}

.dx-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 0;
    background: var(--dx-accent);
    transition: height 0.2s ease;
}

.dx-card:hover {
    background: var(--dx-bg-warm);
    box-shadow: var(--dx-shadow);
    z-index: 1;
}

.dx-card:hover::before {
    height: 100%;
}

.dx-card-icon {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 1rem;
    line-height: 1;
}

.dx-card h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
    letter-spacing: -0.01em;
}

.dx-card p {
    font-size: 0.8125rem;
    color: var(--dx-text-secondary);
    margin: 0;
    line-height: 1.65;
}

.dx-card-tag {
    display: inline-block;
    margin-top: 1.25rem;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--dx-accent);
}

.dx-card-cta {
    display: inline-block;
    margin-top: 1.25rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--dx-text);
}

.dx-card-cta::after {
    content: ' →';
    color: var(--dx-accent);
}

/* ── Badges ── */

.dx-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.dx-badge {
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--dx-border);
    background: var(--dx-bg);
    color: var(--dx-text-secondary);
}

.dx-badge--accent {
    border-color: var(--dx-accent);
    color: var(--dx-accent);
    background: var(--dx-accent-soft);
}

/* ── Panels (content boxes) ── */

.dx-panel {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

.dx-panel--warm {
    background: var(--dx-bg-warm);
}

/* トラック横断プロファイル（成長画面） */
.qual-level-block {
    margin: 0.75rem 0 0;
    padding: 0.85rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--dx-border);
    background: var(--dx-bg-warm, #f8fafc);
}
.qual-level-reached {
    border-color: #93c5fd;
    background: #eff6ff;
}
.qual-level-row {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.qual-level-badge {
    display: inline-block;
    font-weight: 700;
    font-size: 1rem;
    color: #1e3a8a;
    background: #dbeafe;
    border: 1px solid #93c5fd;
    border-radius: 0.35rem;
    padding: 0.2rem 0.65rem;
}
.qual-level-id {
    font-size: 0.8rem;
    color: var(--dx-text-secondary);
    font-weight: 600;
}
.qual-level-profile {
    font-size: 0.8rem;
    font-weight: 700;
    color: #1d4ed8;
}
.qual-level-hr {
    margin: 0.45rem 0 0;
    font-size: 0.875rem;
    line-height: 1.55;
}
.qual-level-anchor,
.qual-level-disclaimer {
    margin: 0.4rem 0 0;
    font-size: 0.75rem;
    color: var(--dx-text-secondary);
}
/* 「今ここ」の階段。段は入口→上の順に並べる（正本: qualitative_level_ladder.html） */
.ql-ladder-card {
    margin: 0 0 1.25rem;
    padding: 1rem 1.15rem 0.9rem;
    border-radius: 0.65rem;
    border: 1px solid #bfdbfe;
    background: #f8fbff;
}
.ql-ladder-head {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.7rem;
}
.ql-ladder-title {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: #1d4ed8;
    background: #dbeafe;
    border-radius: 0.3rem;
    padding: 0.15rem 0.5rem;
}
.ql-ladder-now {
    font-size: 1.35rem;
    font-weight: 700;
    color: #0f172a;
    line-height: 1.3;
}
.ql-ladder {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--dx-border, #e2e8f0);
}
.ql-rung {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    padding: 0.42rem 0.5rem;
    border-bottom: 1px solid #eef2f7;
}
.ql-rung-mark {
    flex: 0 0 5.5rem;
    font-size: 0.7rem;
    font-weight: 700;
    color: #1d4ed8;
    text-align: right;
    white-space: nowrap;
}
.ql-rung-body {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    flex-wrap: wrap;
    min-width: 0;
}
.ql-rung-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: #334155;
}
.ql-rung-anchor {
    font-size: 0.78rem;
    line-height: 1.45;
    color: var(--dx-text-secondary, #64748b);
}
.ql-rung-cleared .ql-rung-name {
    color: #64748b;
}
.ql-rung-current {
    background: #dbeafe;
    border-radius: 0.35rem;
    box-shadow: inset 3px 0 0 #2563eb;
}
.ql-rung-current .ql-rung-name {
    color: #0f172a;
    font-weight: 700;
    font-size: 1rem;
}
.ql-rung-current .ql-rung-anchor {
    color: #1e3a8a;
}
/* 今回の試験では判定対象外の段 */
.ql-rung-outside {
    opacity: 0.45;
}
.ql-rung-pending {
    background: #fef3c7;
    box-shadow: inset 3px 0 0 #d97706;
}
.ql-rung-pending .ql-rung-name,
.ql-rung-pending .ql-rung-mark {
    color: #b45309;
}
.ql-ladder-def {
    margin: 0.7rem 0 0;
    font-size: 0.88rem;
    line-height: 1.6;
    color: #0f172a;
}
.ql-ladder-note {
    margin: 0.4rem 0 0;
    font-size: 0.73rem;
    line-height: 1.5;
    color: var(--dx-text-secondary, #64748b);
}

/* レベル表示の免責。ページ下段に 1 回だけ出す注記 */
.qual-level-footnote {
    margin: 1.25rem 0 0;
    text-align: center;
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--dx-text-secondary);
}
.cross-track-table {
    width: 100%;
    margin-top: 0.65rem;
    font-size: 0.8rem;
    border-collapse: collapse;
}
.cross-track-table th,
.cross-track-table td {
    border-bottom: 1px solid var(--dx-border);
    padding: 0.35rem 0.25rem;
    text-align: left;
}
.cross-track-pdf-link {
    margin: 0.65rem 0 0;
    font-size: 0.82rem;
}
.cross-track-pdf-link a {
    color: #1d4ed8;
    font-weight: 600;
}

/* ── Subject / track pages ── */

.tracks-page,
.subject-page {
    max-width: var(--dx-max-width);
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.tracks-hero,
.subject-hero {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--dx-border);
}

.tracks-hero h1,
.subject-hero h1 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    margin: 0.75rem 0 0.5rem;
}

.tracks-hero p,
.subject-hero p {
    color: var(--dx-text-secondary);
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.75;
    max-width: 36em;
}

.tracks-back {
    font-size: 0.8125rem;
    color: var(--dx-text-muted);
    text-decoration: none;
}

.tracks-back:hover {
    color: var(--dx-accent);
}

.tracks-grid,
.pillar-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--dx-border);
    border: 1px solid var(--dx-border);
}

/* 2カラム固定（カード4枚なら 2x2）。狭い画面は1カラム。 */
@media (min-width: 640px) {
    .pillar-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.tracks-card,
.pillar-card {
    display: block;
    background: var(--dx-surface);
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: background 0.2s;
    position: relative;
}

.tracks-card::before,
.pillar-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 0;
    background: var(--dx-accent, var(--accent, #ac2317));
    transition: height 0.2s;
}

.tracks-card:hover,
.pillar-card:hover {
    background: var(--dx-bg-warm);
    z-index: 1;
}

.tracks-card:hover::before,
.pillar-card:hover::before {
    height: 100%;
}

.tracks-card-icon,
.pillar-icon,
.subject-icon {
    font-size: 1.75rem;
    display: block;
    margin-bottom: 0.75rem;
    line-height: 1;
}

/* 細線アイコン（templates/partials/icons.html）。罫線と同じ濃度で置き、
   カードに触れたときだけアクセント色へ寄せる。
   大きさは見出し（1.0625rem）を超えない。アイコンが主役ではない。 */
.dx-icon {
    display: block;
    width: 1rem;
    height: 1rem;
    stroke: currentColor;
}

.pillar-icon {
    color: var(--dx-accent);
    margin-bottom: 0.6rem;
}

.tracks-card-logo-slot {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    height: 44px;
    margin-bottom: 0.85rem;
}

.tracks-card-logo {
    display: block;
    height: 36px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    object-position: left center;
    margin: 0;
}

.subject-logo {
    display: block;
    width: min(240px, 100%);
    height: auto;
    margin-bottom: 0.85rem;
}

.subject-hero .subject-logo {
    width: auto;
    height: 48px;
    max-width: min(280px, 40vw);
    object-fit: contain;
    object-position: left center;
    flex-shrink: 0;
    margin-bottom: 0;
}

.tracks-card h2,
.pillar-card h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.tracks-card p,
.pillar-card p {
    font-size: 0.8125rem;
    color: var(--dx-text-secondary);
    margin: 0;
    line-height: 1.65;
}

.tracks-card-cta {
    display: inline-block;
    margin-top: 1.25rem;
    font-size: 0.8125rem;
    font-weight: 600;
}

.tracks-card-cta::after {
    content: ' →';
    color: var(--dx-accent);
}

.subject-breadcrumb {
    font-size: 0.75rem;
    color: var(--dx-text-muted);
    margin-bottom: 1.5rem;
}

.subject-breadcrumb a {
    color: var(--dx-text-secondary);
    text-decoration: none;
}

.subject-breadcrumb a:hover {
    color: var(--dx-accent);
}

.subject-breadcrumb span {
    margin: 0 0.35rem;
}

.subject-hero {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 2rem;
    background: var(--dx-bg-warm);
    border: 1px solid var(--dx-border);
    margin-bottom: 2.5rem;
}

.subject-section-title {
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--dx-text-muted);
    margin: 0 0 1rem;
    border: none;
    padding: 0;
}

.subject-extras {
    margin-top: 2.5rem;
}

.extras-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.extra-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.8125rem;
    padding: 0.5rem 1rem;
    background: var(--dx-bg);
    border: 1px solid var(--dx-border);
    text-decoration: none;
    color: var(--dx-text-secondary);
    transition: border-color 0.15s, color 0.15s;
}

.extra-link .dx-icon {
    width: 0.875rem;
    height: 0.875rem;
    flex-shrink: 0;
    color: var(--dx-accent);
}

.extra-link:hover {
    border-color: var(--dx-text);
    color: var(--dx-text);
}

/* ── Tables (global refresh) ── */

.section {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    border-radius: 0;
    box-shadow: none;
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

.difficulty-table th,
.comment-table th,
.ranking-table th {
    background: var(--dx-text);
    color: var(--dx-text-inverse);
    font-weight: 500;
    font-size: 0.8125rem;
    letter-spacing: 0.02em;
}

.ranking-table th {
    background: var(--dx-text);
    border-color: var(--dx-text);
}

.container {
    max-width: var(--dx-max-width);
}

/* ── Login ── */

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dx-bg-warm);
    padding: 2rem 1.5rem;
}

.login-panel {
    width: 100%;
    max-width: 400px;
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    padding: 2.5rem 2rem;
}

.login-panel h2 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 0.25rem;
    letter-spacing: -0.02em;
}

.login-panel .dx-eyebrow {
    display: block;
    text-align: center;
    margin-bottom: 0.5rem;
}

.login-panel .login-brand-logo {
    margin-bottom: 0.75rem;
}

.login-field {
    margin-bottom: 1rem;
}

.login-field label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--dx-text-muted);
    margin-bottom: 0.35rem;
}

.login-field input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--dx-font);
    font-size: 0.9375rem;
    border: 1px solid var(--dx-border-strong);
    border-radius: var(--dx-radius-sm);
    background: var(--dx-bg);
    transition: border-color 0.15s;
}

.login-field input:focus {
    outline: none;
    border-color: var(--dx-text);
}

.login-error {
    color: var(--dx-accent);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: 1rem;
}

/* ── Red square list (i3 style) ── */

.dx-list li::marker {
    color: var(--dx-accent);
}

.dx-list--square {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dx-list--square li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--dx-text-secondary);
    line-height: 1.75;
}

.dx-list--square li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 6px;
    height: 6px;
    background: var(--dx-accent);
}

/* ══ MetriXとは 本文（公開ランディング landing.html 専用。買い手向け訴求） ══ */

.about-page {
    max-width: var(--dx-max-width);
    margin: 0 auto;
    padding: 2rem 1.25rem 4rem;
}

.about-hero {
    padding: 2.5rem 0 2rem;
    border-bottom: 1px solid var(--dx-border);
    margin-bottom: 2.5rem;
    position: relative;
    scroll-margin-top: calc(var(--dx-header-height) + 1rem);
}

.about-hero::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 4.5rem;
    height: 2px;
    background: var(--dx-accent);
}

.about-kicker {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--dx-accent);
    margin: 0 0 0.75rem;
}

.about-hero h1 {
    margin: 0 0 1rem;
    font-size: clamp(1.85rem, 4.5vw, 2.65rem);
}

.about-hero h1 .about-brand-x {
    color: var(--dx-accent);
}

.about-hero-lead {
    font-size: 1.05rem;
    color: var(--dx-text-secondary);
    max-width: 40rem;
    margin: 0;
    line-height: 1.8;
}

.about-toc {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
}

.about-toc a {
    font-size: 0.8125rem;
    color: var(--dx-text-secondary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

.about-toc a:hover {
    color: var(--dx-accent);
    border-bottom-color: var(--dx-accent);
}

.about-section {
    margin-bottom: 3rem;
    scroll-margin-top: calc(var(--dx-header-height) + 1rem);
}

.about-section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--dx-text-muted);
    margin: 0 0 0.35rem;
}

.about-section h2 {
    font-size: 1.35rem;
    margin: 0 0 0.75rem;
}

.about-section > p {
    color: var(--dx-text-secondary);
    margin: 0 0 1.25rem;
    max-width: 42rem;
}

.about-pillars {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--dx-border);
    border: 1px solid var(--dx-border);
}

@media (min-width: 720px) {
    .about-pillars {
        grid-template-columns: repeat(3, 1fr);
    }
}

.about-pillar {
    background: var(--dx-surface);
    padding: 1.5rem 1.35rem;
}

.about-pillar-num {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--dx-accent);
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}

.about-pillar h3 {
    font-size: 1rem;
    margin: 0 0 0.5rem;
}

.about-pillar p {
    font-size: 0.875rem;
    color: var(--dx-text-secondary);
    margin: 0;
    line-height: 1.7;
}

.about-flow {
    display: grid;
    gap: 0.75rem;
}

@media (min-width: 800px) {
    .about-flow {
        grid-template-columns: repeat(4, 1fr);
        gap: 1px;
        background: var(--dx-border);
        border: 1px solid var(--dx-border);
    }
    .about-flow-step {
        border: none !important;
    }
}

.about-flow-step {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    padding: 1.25rem 1.15rem;
    position: relative;
}

.about-flow-step strong {
    display: block;
    font-size: 0.9375rem;
    margin-bottom: 0.35rem;
}

.about-flow-step span {
    font-size: 0.8125rem;
    color: var(--dx-text-secondary);
    line-height: 1.65;
}

.about-compare {
    display: grid;
    gap: 1px;
    background: var(--dx-border);
    border: 1px solid var(--dx-border);
}

@media (min-width: 640px) {
    .about-compare {
        grid-template-columns: 1fr 1fr;
    }
}

.about-compare-col {
    background: var(--dx-surface);
    padding: 1.5rem 1.35rem;
}

.about-compare-col h3 {
    font-size: 0.9375rem;
    margin: 0 0 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.about-compare-col h3::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--dx-accent);
    flex-shrink: 0;
}

.about-compare-col.about-compare-col--muted h3::before {
    background: var(--dx-border-strong);
}

.about-compare-col ul {
    margin: 0;
    padding: 0 0 0 1.1rem;
    color: var(--dx-text-secondary);
    font-size: 0.875rem;
}

.about-compare-col li {
    margin-bottom: 0.4rem;
}

.about-axes {
    display: grid;
    gap: 1rem;
}

@media (min-width: 720px) {
    .about-axes {
        grid-template-columns: 1fr 1fr;
    }
}

.about-axis {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    padding: 1.5rem 1.35rem;
    border-left: 3px solid var(--dx-accent);
}

.about-axis--secondary {
    border-left-color: var(--dx-border-strong);
}

.about-axis .about-tag {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--dx-accent);
    margin-bottom: 0.5rem;
}

.about-axis--secondary .about-tag {
    color: var(--dx-text-muted);
}

.about-axis h3 {
    font-size: 1.05rem;
    margin: 0 0 0.5rem;
}

.about-axis p {
    font-size: 0.875rem;
    color: var(--dx-text-secondary);
    margin: 0;
}

.about-particles {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.65rem;
}

@media (min-width: 640px) {
    .about-particles {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 960px) {
    .about-particles {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

.about-particle {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    padding: 1.1rem 1.15rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.about-particle:hover {
    border-color: var(--dx-border-strong);
    box-shadow: var(--dx-shadow-sm);
}

.about-particle-idx {
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--dx-accent);
    letter-spacing: 0.04em;
}

.about-particle h3 {
    font-size: 0.9375rem;
    margin: 0.25rem 0 0.35rem;
}

.about-particle p {
    font-size: 0.8125rem;
    color: var(--dx-text-secondary);
    margin: 0;
    line-height: 1.65;
}

.about-viz {
    display: grid;
    gap: 1px;
    background: var(--dx-border);
    border: 1px solid var(--dx-border);
}

@media (min-width: 640px) {
    .about-viz {
        grid-template-columns: 1fr 1fr 1fr;
    }
    /* 2枚並べる用。3列グリッドに2枚だと余白が空くため。 */
    .about-viz--pair {
        grid-template-columns: 1fr 1fr;
    }
}

/* 対応トラック。4科目を2×2で並べる。カード本文が長いので、狭い幅では潰さず1列で読ませる。 */
@media (min-width: 900px) {
    .about-viz--tracks {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 899px) {
    .about-viz--tracks {
        grid-template-columns: 1fr;
    }
}

.about-viz-badge {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--dx-accent);
    border: 1px solid currentColor;
    padding: 0.1rem 0.45rem;
    margin-bottom: 0.55rem;
}

.about-viz-badge--soon {
    color: var(--dx-text-muted);
}

.about-viz-item--soon {
    background: var(--dx-bg-warm);
}

.about-viz-claim {
    font-weight: 700;
    color: var(--dx-text);
    margin: 0 0 0.5rem !important;
}

.about-viz-note {
    margin-top: 0.6rem !important;
    padding-top: 0.6rem;
    border-top: 1px solid var(--dx-border);
    font-size: 0.75rem !important;
}

.about-viz-item {
    background: var(--dx-surface);
    padding: 1.35rem 1.25rem;
}

.about-viz-item h3 {
    font-size: 0.9375rem;
    margin: 0 0 0.4rem;
}

.about-viz-item p {
    font-size: 0.8125rem;
    color: var(--dx-text-secondary);
    margin: 0;
}

.about-dont {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    padding: 1.35rem 1.5rem;
}

.about-dont h3 {
    font-size: 0.9375rem;
    margin: 0 0 0.75rem;
}

.about-dont ul {
    margin: 0;
    padding: 0 0 0 1.15rem;
    font-size: 0.875rem;
    color: var(--dx-text-secondary);
}

.about-dont li {
    margin-bottom: 0.45rem;
}

.about-footnote {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--dx-border);
    font-size: 0.8125rem;
    color: var(--dx-text-muted);
}

.about-footnote a {
    color: var(--dx-text-secondary);
}

/* ══ ログイン後ダッシュボード（home.html 専用。メンバー向け） ══════════════
   公開ランディング(landing.html)の .about-* とは別系統。共有しないこと。 */
.dash-page {
    max-width: var(--dx-max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem 4rem;
}

.dash-head {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--dx-border);
    margin-bottom: 2.5rem;
}

.dash-kicker {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--dx-accent);
    margin: 0 0 0.5rem;
}

.dash-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.3;
    color: var(--dx-text);
    margin: 0;
}

.dash-lead {
    font-size: 0.9375rem;
    color: var(--dx-text-secondary);
    margin: 0.75rem 0 0;
}

.dash-section {
    margin-bottom: 2.5rem;
}

.dash-section-title {
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--dx-text-secondary);
    margin: 0 0 1rem;
}

.dash-cards {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.75rem;
}

.dash-card,
.dash-pane {
    background: var(--dx-surface);
    border: 1px solid var(--dx-border);
    border-radius: var(--dx-radius);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--dx-shadow-sm);
}

/* 「次にやること」は行動を促す枠。左に赤を差して他と区別する。 */
.dash-card--action {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    border-left: 3px solid var(--dx-accent);
}

.dash-card-body {
    min-width: 0;
}

.dash-card-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--dx-text);
    margin: 0.375rem 0 0;
}

.dash-card-meta {
    font-size: 0.8125rem;
    color: var(--dx-text-muted);
    margin: 0.25rem 0 0;
}

.dash-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    border-radius: var(--dx-radius-sm);
    border: 1px solid var(--dx-border-strong);
    color: var(--dx-text-secondary);
}

.dash-badge--assigned {
    background: var(--dx-accent-soft);
    border-color: var(--dx-accent);
    color: var(--dx-accent);
}

.dash-badge--pass {
    background: var(--dx-bg-muted);
    border-color: var(--dx-text);
    color: var(--dx-text);
}

.dash-badge--fail {
    background: var(--dx-bg-warm);
}

.dash-empty {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: var(--dx-bg-warm);
    border: 1px dashed var(--dx-border-strong);
    border-radius: var(--dx-radius);
    padding: 1.25rem 1.5rem;
}

.dash-empty p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--dx-text-secondary);
}

.dash-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.dash-pane .btn-secondary {
    margin-top: 1rem;
}

.dash-score {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin: 0.75rem 0 0;
}

.dash-score-value {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--dx-text);
}

.dash-muted {
    font-size: 0.875rem;
    color: var(--dx-text-secondary);
    margin: 0;
}

.dash-history {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--dx-border);
}

.dash-history-row {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--dx-border);
    font-size: 0.875rem;
}

.dash-history-date {
    color: var(--dx-text-muted);
    font-variant-numeric: tabular-nums;
    flex: 0 0 6rem;
}

.dash-history-name {
    color: var(--dx-text);
    flex: 1 1 12rem;
    min-width: 0;
}

.dash-history-score {
    color: var(--dx-text-secondary);
}

.dash-footnote {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--dx-border);
    font-size: 0.875rem;
    color: var(--dx-text-muted);
}