@import url("https://fonts.googleapis.com/css2?family=Shippori+Mincho+B1:wght@500;600&family=Zen+Kaku+Gothic+New:wght@400;500;700&display=swap");

:root {
    color-scheme: dark;
    --bg: #0b1220;
    --bg-alt: #0f172a;
    --panel: #11182b;
    --panel-strong: #16203a;
    --ink: #e5e7eb;
    --muted: #94a3b8;
    --border: #1f2a3d;
    --accent: #38bdf8;
    --accent-strong: #22d3ee;
    --accent-soft: rgba(56, 189, 248, 0.2);
    --warm: #f59e0b;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    --shadow-soft: 0 8px 20px rgba(0, 0, 0, 0.3);
    --radius: 18px;
    --font-sans: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
    --font-display: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", "MS Mincho", serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
    --space-1: 8px;
    --space-2: 12px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;
    --space-6: 44px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(120% 120% at 20% 10%, rgba(56, 189, 248, 0.16), transparent 50%),
        radial-gradient(120% 120% at 80% 0%, rgba(236, 72, 153, 0.12), transparent 55%),
        linear-gradient(180deg, #0b1220 0%, #0b1324 45%, #0b1220 100%);
    color: var(--ink);
    font-family: var(--font-sans);
    line-height: 1.7;
    letter-spacing: 0.01em;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at 10% 60%, rgba(255, 255, 255, 0.08), transparent 55%);
    opacity: 1;
    pointer-events: none;
    z-index: 0;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-shell {
    max-width: 1180px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-3) var(--space-6);
    position: relative;
    z-index: 1;
}

.page-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
    gap: var(--space-4);
    align-items: start;
    margin-bottom: var(--space-4);
}

.page-title h1 {
    margin: 0 0 var(--space-2);
    font-family: var(--font-display);
    font-size: clamp(32px, 4vw, 46px);
    letter-spacing: 0.03em;
}

.page-title .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent-strong);
    background: rgba(255, 255, 255, 0.04);
}

.page-title .lede {
    margin: 0;
    color: var(--muted);
    font-size: 16px;
}

.page-aside {
    display: grid;
    gap: var(--space-2);
}

.stat-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-2) var(--space-3);
    box-shadow: var(--shadow-soft);
    display: grid;
    gap: 6px;
}

.stat-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--muted);
}

.stat-value {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.stat-card.stat-note {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(236, 72, 153, 0.12)), var(--panel);
}

.stat-card.stat-note .stat-value {
    font-size: 14px;
    font-weight: 500;
}

.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.category-chip {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--ink);
    font-weight: 600;
    box-shadow: var(--shadow-soft);
}

.category-chip:hover {
    transform: translateY(-1px);
    border-color: rgba(56, 189, 248, 0.5);
}

.category-chip:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.category-chip .chip-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 26px;
    height: 26px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-size: 12px;
    letter-spacing: 0.05em;
}

.tool-sections {
    display: grid;
    gap: var(--space-5);
}

.tool-section {
    padding: var(--space-3);
    border-radius: calc(var(--radius) + 6px);
    background: rgba(17, 24, 39, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--shadow-soft);
    animation: sectionIn 0.6s ease both;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.section-heading {
    max-width: 560px;
}

.section-eyebrow {
    display: inline-block;
    margin-bottom: 6px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--accent);
    font-weight: 600;
}

.section-header h2 {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(22px, 3vw, 30px);
}

.section-header p {
    margin: 6px 0 0;
    color: var(--muted);
}

.section-count {
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-3);
}

.tool-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-3);
    box-shadow: var(--shadow);
    overflow: hidden;
    isolation: isolate;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    opacity: 0;
    transform: translateY(10px);
    animation: cardIn 0.5s ease forwards;
}

.tool-card::before {
    content: "";
    position: absolute;
    top: -60px;
    right: -60px;
    width: 140px;
    height: 140px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.22), transparent 65%);
    opacity: 0.7;
    z-index: 0;
}

.tool-card > * {
    position: relative;
    z-index: 1;
}

.tool-card:hover {
    border-color: rgba(56, 189, 248, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
}

.tool-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    width: fit-content;
}

.tool-meta h3 {
    margin: 0;
    font-size: 18px;
}

.tool-meta p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.pill-button {
    align-self: flex-start;
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid transparent;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.9), rgba(34, 211, 238, 0.9));
    color: #fff;
    font-weight: 600;
    letter-spacing: 0.03em;
    box-shadow: 0 10px 24px rgba(20, 125, 115, 0.25);
}

.pill-button:hover {
    background: linear-gradient(135deg, rgba(34, 211, 238, 1), rgba(56, 189, 248, 1));
    transform: translateY(-1px);
    box-shadow: 0 14px 30px rgba(56, 189, 248, 0.35);
}

.pill-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.tool-grid .tool-card:nth-child(1) {
    animation-delay: 0.05s;
}

.tool-grid .tool-card:nth-child(2) {
    animation-delay: 0.1s;
}

.tool-grid .tool-card:nth-child(3) {
    animation-delay: 0.15s;
}

.tool-grid .tool-card:nth-child(4) {
    animation-delay: 0.2s;
}

.tool-grid .tool-card:nth-child(5) {
    animation-delay: 0.25s;
}

.tool-grid .tool-card:nth-child(6) {
    animation-delay: 0.3s;
}

footer {
    margin-top: var(--space-5);
    padding-top: var(--space-3);
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 14px;
    text-align: center;
}

@keyframes sectionIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 960px) {
    .page-header {
        grid-template-columns: 1fr;
    }

    .page-aside {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }
}

@media (max-width: 640px) {
    .page-shell {
        padding: var(--space-5) var(--space-3);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .section-count {
        order: 2;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }

    .tool-card {
        opacity: 1;
        transform: none;
    }
}