/* tokens.css */
:root {
    --color-bg: #0a0c10;
    --color-surface: #11141a;
    --color-surface-2: #191d25;
    --color-surface-3: #222731;
    --color-text: #f0f4f8;
    --color-text-muted: #94a9bc;
    --color-border: #1e262f;
    --color-border-muted: #151b23;
    --color-border-section: rgba(38, 52, 69, 0.9);
    --color-primary: #58a6ff;
    --color-primary-strong: #1f6feb;
    --color-accent: #7ee787;
    --color-danger: #f85149;
    --color-success: #3fb950;

    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 16px 48px rgba(0, 0, 0, 0.3);

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;

    --container-max: 1200px;
    --content-max: 860px;

    --text-xs: 12px;
    --text-sm: 14px;
    --text-md: 16px;
    --text-lg: 18px;
    --text-xl: 24px;
    --text-2xl: 32px;
    --text-3xl: 42px;

    --line-base: 1.6;

    --transition-fast: 160ms ease;
    --transition-base: 220ms ease;

    --color-cat-ai: #a78bfa;
    --color-cat-quant: #34d399;
    --color-cat-dev: #fbbf24;
    --color-cat-games: #f87171;
    --color-cat-local: #fb923c;
    --color-cat-design: #38bdf8;
    --color-cat-text: #a3e635;
    --color-cat-time: #22d3ee;
    --color-cat-edu: #c084fc;
}

/* layout.css */
[hidden] { display: none !important; }

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

html,
body {
    margin: 0;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
    line-height: var(--line-base);
}

a {
    color: inherit;
    text-decoration: none;
    touch-action: manipulation;
}

img {
    max-width: 100%;
    display: block;
}

.page-shell {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.site-header,
.site-footer {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.site-footer {
    border-top: 1px solid var(--color-border);
    border-bottom: 0;
    margin-top: auto;
}

.site-header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 700;
    font-size: var(--text-lg);
    letter-spacing: 0.02em;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.site-nav a {
    transition: color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
    color: var(--color-text);
}

.lang-toggle {
    appearance: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-muted);
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
    color: var(--color-text);
    border-color: var(--color-primary);
}

.site-nav--compact {
    gap: 10px;
}

.site-nav--footer {
    justify-content: flex-start;
    gap: 10px 14px;
}

.site-nav--footer-compact {
    align-self: center;
}

.container {
    width: min(100% - 32px, var(--container-max));
    margin-inline: auto;
}

.section {
    padding-block: var(--space-7);
}

.section-sm {
    padding-block: var(--space-6);
}

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

.cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    align-items: center;
}

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

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.page-title {
    font-size: var(--text-3xl);
    line-height: 1.15;
    margin: 0;
}

.page-title--display {
    font-size: clamp(42px, 6vw, 64px);
}

.page-subtitle {
    color: var(--color-text-muted);
    max-width: 72ch;
    margin: 0;
}

.section-surface-hero {
    position: relative;
    padding-block: clamp(52px, 9vw, 88px);
    background:
        linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%),
        radial-gradient(circle at top right, rgba(88, 166, 255, 0.08), transparent 48%);
}

.section-card-surface {
    position: relative;
    padding-block: clamp(40px, 7vw, 64px);
    background: var(--color-bg);
}

.section-card-surface+.section-card-surface {
    border-top: 1px solid var(--color-border-section);
}

.section-faq {
    padding-block: clamp(32px, 5vw, 48px);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border-section);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-width: 72ch;
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-4);
}

.faq-item summary.faq-question {
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    user-select: none;
}

.faq-item summary.faq-question::-webkit-details-marker {
    display: none;
}

.faq-item p.faq-answer {
    margin-top: var(--space-3);
    color: var(--color-text-muted);
    line-height: 1.6;
}

.surface-hero {
    display: grid;
    gap: var(--space-3);
}

.surface-hero--center {
    max-width: 68ch;
    margin-inline: auto;
    justify-items: center;
    text-align: center;
}

.surface-hero--left {
    max-width: 60ch;
}

.surface-eyebrow {
    margin: 0;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 11px;
    font-weight: 700;
}

.surface-section-heading {
    display: grid;
    gap: 6px;
    max-width: 58ch;
}

.section-title {
    margin: 0;
    font-size: clamp(28px, 4vw, 38px);
    line-height: 1.15;
}

.section-copy {
    margin: 0;
    color: var(--color-text-muted);
    max-width: 70ch;
}

.surface-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.tool-shell {
    padding: var(--space-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.tool-ui {
    display: grid;
    gap: var(--space-4);
}

.page-shell--tool .site-header.section-sm,
.page-shell--tool .site-footer.section-sm,
.page-shell--cards .site-header.section-sm,
.page-shell--cards .site-footer.section-sm {
    padding-block: 14px;
}

.section-tool-page {
    padding-block: var(--space-5);
}

.tool-frame {
    display: grid;
    gap: var(--space-4);
}

.tool-frame>* {
    min-width: 0;
}

.tool-frame--utility {
    gap: var(--space-4);
}

.tool-frame--analysis,
.tool-frame--playful {
    gap: var(--space-5);
}

.tool-header-block {
    display: grid;
    gap: 6px;
    max-width: 60ch;
}

.footer-grid {
    display: grid;
    gap: var(--space-4);
    align-items: start;
}

.footer-grid--cards {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.5fr) minmax(0, 1fr);
}

.footer-grid--tool {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 18px;
}

.footer-brand {
    display: grid;
    gap: 4px;
    min-width: 0;
}

.footer-title {
    font-size: var(--text-md);
    letter-spacing: 0.02em;
}

.footer-copy,
.footer-heading {
    margin: 0;
}

.footer-copy {
    max-width: 42ch;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.footer-nav-group {
    display: grid;
    gap: 8px;
    min-width: 0;
}

.footer-connect-stack {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 14px;
}

.footer-connect-stack .site-nav {
    flex: 1 1 auto;
    min-width: 0;
}

.footer-kofi-widget {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    flex: 0 0 auto;
}

.footer-tool-links {
    min-width: 0;
    justify-self: start;
}

.footer-tool-links .site-nav {
    justify-content: flex-start;
}

.footer-tool-kofi {
    display: flex;
    align-items: center;
    justify-self: end;
    flex: 0 0 auto;
}

.footer-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.footer-cta-row--tool {
    width: min(100% - 32px, var(--container-max));
    margin: 12px auto 0;
}

.footer-cta-button {
    justify-content: center;
}

.footer-banner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px 16px;
    padding: 14px 0 18px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 18px;
}

.footer-banner-copy-group {
    display: grid;
    gap: 4px;
    min-width: 0;
}

.footer-banner-eyebrow,
.footer-banner-title,
.footer-banner-copy {
    margin: 0;
}

.footer-banner-eyebrow {
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 11px;
    font-weight: 700;
}

.footer-banner-title {
    font-size: var(--text-md);
}

.footer-banner-copy {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    max-width: 56ch;
}

.footer-heading {
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 11px;
    font-weight: 700;
}

.tool-frame--utility .tool-header-block {
    max-width: 38ch;
}

.tool-frame--analysis .tool-header-block {
    max-width: 50ch;
}

.tool-frame--playful .tool-header-block {
    max-width: 46ch;
}

.tool-header-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.tool-notes {
    display: grid;
    gap: var(--space-3);
}

.tool-notes>* {
    margin: 0;
}

.tool-note-inline {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

@media (max-width: 960px) {
    .section-tool-page {
        padding-block: var(--space-4);
    }

    .tool-frame--analysis,
    .tool-frame--playful {
        gap: var(--space-4);
    }
}

@media (max-width: 720px) {

    .page-shell--tool .site-header.section-sm,
    .page-shell--tool .site-footer.section-sm,
    .page-shell--cards .site-header.section-sm,
    .page-shell--cards .site-footer.section-sm {
        padding-block: 12px;
    }

    .section-tool-page {
        padding-block: 12px;
    }

    .tool-header-block {
        gap: 4px;
    }

    .tool-header-meta,
    .tool-note-inline {
        font-size: 12px;
    }

    .footer-banner,
    .footer-cta-row--tool {
        width: min(100% - 32px, var(--container-max));
    }

    .footer-grid--tool {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .footer-tool-links,
    .footer-tool-kofi {
        justify-self: start;
    }

    .footer-tool-links .site-nav {
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        width: min(100% - 24px, var(--container-max));
    }

    .tool-frame {
        gap: 12px;
    }

    .footer-cta-row--tool,
    .footer-banner {
        width: min(100% - 24px, var(--container-max));
    }
}

/* cards.css */
@keyframes card-enter {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    padding: var(--space-5);
    display: grid;
    gap: var(--space-3);
    min-height: 100%;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
    animation: card-enter 0.4s ease both;
}

.card:nth-child(2) { animation-delay: 60ms; }
.card:nth-child(3) { animation-delay: 120ms; }
.card:nth-child(4) { animation-delay: 180ms; }
.card:nth-child(5) { animation-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
    .card { animation: none; }
}

@media (hover: hover) {
    .card:hover {
        transform: translateY(-2px);
        border-color: var(--color-primary);
        box-shadow: var(--shadow-md);
    }
}

.card:focus-within {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

/* Category accent fallback (overridden by inline --card-accent when per-tool accent is set) */
.card[data-category="ai"]          { --card-accent: var(--color-cat-ai); --card-accent-bg: rgba(167, 139, 250, 0.12); }
.card[data-category="quant"]       { --card-accent: var(--color-cat-quant); --card-accent-bg: rgba(52, 211, 153, 0.12); }
.card[data-category="dev"]         { --card-accent: var(--color-cat-dev); --card-accent-bg: rgba(251, 191, 36, 0.12); }
.card[data-category="games"]       { --card-accent: var(--color-cat-games); --card-accent-bg: rgba(248, 113, 113, 0.12); }
.card[data-category="local"]       { --card-accent: var(--color-cat-local); --card-accent-bg: rgba(251, 146, 60, 0.12); }
.card[data-category="design"]      { --card-accent: var(--color-cat-design); --card-accent-bg: rgba(56, 189, 248, 0.12); }
.card[data-category="text"]        { --card-accent: var(--color-cat-text); --card-accent-bg: rgba(163, 230, 53, 0.12); }
.card[data-category="time"]        { --card-accent: var(--color-cat-time); --card-accent-bg: rgba(34, 211, 238, 0.12); }
.card[data-category="edu"]         { --card-accent: var(--color-cat-edu); --card-accent-bg: rgba(192, 132, 252, 0.12); }

/* Left border follows per-tool accent (unified with icon frame + eyebrow color) */
.card[data-category] { border-left: 3px solid var(--card-accent); }

/* ── Card header: icon badge + eyebrow in one row ──────────────────────── */

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-height: 36px;             /* stable row height with or without icon */
}

.card-icon-frame {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: var(--card-accent-bg);
    color: var(--card-accent, var(--color-primary));
}

.card-icon {
    width: 22px;
    height: 22px;
}

/* ── Card eyebrow ───────────────────────────────────────────────────────── */

.card-eyebrow {
    margin: 0;
    color: var(--card-accent, var(--color-primary));
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 11px;
    font-weight: 700;
}

.card-count-badge {
    display: inline-block;
    margin-left: var(--space-2);
    padding: 1px 8px;
    border-radius: var(--radius-sm);
    background: var(--color-border);
    color: var(--color-text-muted);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: none;
    vertical-align: middle;
}

.card-title {
    margin: 0;
    font-size: var(--text-xl);
    line-height: 1.2;
}

.card-text {
    margin: 0;
    color: var(--color-text-muted);
}

.card-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    margin-top: auto;
}

.card-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-primary);
    font-weight: 600;
}

.category-hint {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-style: italic;
}

.tool-discovery {
    display: grid;
    gap: var(--space-4);
    margin-top: var(--space-5);
}

.tool-discovery__intro {
    display: grid;
    gap: var(--space-2);
    max-width: 64ch;
}

.tool-discovery__title {
    margin: 0;
    font-size: clamp(1.35rem, 2.2vw, 1.8rem);
    line-height: 1.15;
}

.tool-discovery__search-notes {
    display: grid;
    gap: 6px;
}

.tool-discovery__search-note {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.tool-discovery__grid {
    align-items: stretch;
}

.tool-discovery__card {
    align-content: start;
}

.tool-discovery__list,
.tool-discovery__faq {
    margin: 0;
    color: var(--color-text-muted);
}

.tool-discovery__list {
    padding-left: 1.1rem;
    display: grid;
    gap: var(--space-2);
}

.tool-discovery__list--plain {
    list-style: none;
    padding-left: 0;
}

.tool-discovery__example-item {
    display: grid;
    gap: 4px;
}

.tool-discovery__example-item strong {
    color: var(--color-text);
}

.tool-discovery__faq {
    display: grid;
    gap: var(--space-3);
}

.tool-discovery__faq-item {
    display: grid;
    gap: 4px;
    margin: 0;
}

.tool-discovery__faq-item dt {
    font-weight: 700;
    color: var(--color-text);
}

.tool-discovery__faq-item dd {
    margin: 0;
}

.tool-discovery__related {
    display: grid;
    gap: var(--space-2);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.tool-discovery__subheading {
    margin: 0;
    font-size: var(--text-base);
    line-height: 1.2;
}

.browse-discovery {
    padding-top: 0;
}

.browse-discovery__intro {
    display: grid;
    gap: var(--space-2);
    max-width: 72ch;
}

.browse-discovery__grid {
    align-items: stretch;
}

.browse-discovery__card {
    align-content: start;
}

.browse-discovery__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: var(--space-3);
}

.browse-discovery__item {
    display: grid;
    gap: 4px;
}

.browse-discovery__link {
    color: var(--color-text);
    font-weight: 700;
}

.browse-discovery__detail {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

/* buttons.css */
.button {
    appearance: none;
    border: 1px solid var(--color-border);
    background: var(--color-surface-2);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    min-height: 44px;
    font: inherit;
    cursor: pointer;
    touch-action: manipulation;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

@media (hover: hover) {
    .button:hover {
        border-color: var(--color-primary);
        transform: translateY(-1px);
    }
}

.button:focus-visible {
    border-color: var(--color-primary);
}

.button-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #07111d;
    font-weight: 700;
}

.button-secondary {
    background: transparent;
}

.button-sm {
    padding: 6px 14px;
    min-height: 0;
    font-size: 0.82rem;
}

.input,
.textarea {
    width: 100%;
    border: 1px solid var(--color-border);
    background: var(--color-surface-2);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font: inherit;
}

.textarea {
    min-height: 160px;
    resize: vertical;
}

/* responsive.css */
@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .page-title {
        font-size: 36px;
    }

    .site-header-bar {
        align-items: flex-start;
    }

    .footer-grid--cards {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    }
}

@media (max-width: 720px) {
    .section {
        padding-block: var(--space-6);
    }

    .section-sm {
        padding-block: var(--space-5);
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .container {
        width: min(100% - 24px, var(--container-max));
    }

    .page-title {
        font-size: 30px;
    }

    .page-title--display {
        font-size: clamp(38px, 12vw, 52px);
    }

    .tool-shell {
        padding: var(--space-4);
    }

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

    .site-nav {
        justify-content: flex-start;
        gap: 10px;
        font-size: 12px;
    }

    .footer-grid--cards,
    .footer-grid--tool {
        grid-template-columns: 1fr;
    }

    .site-nav--footer-compact {
        align-self: flex-start;
    }

    .section-surface-hero,
    .section-card-surface {
        padding-block: var(--space-6);
    }
}

@media (max-width: 480px) {
    .site-nav {
        row-gap: 6px;
    }

    .surface-section-heading,
    .surface-hero {
        gap: var(--space-2);
    }

    .card {
        padding: var(--space-4);
    }
}