/* ============================================
   toRoman Interactive Playground
   Aesthetic: Warm, friendly, approachable docs
   Cream whites, warm indigo accents, soft coral
   Fonts: Plus Jakarta Sans + DM Mono + Lora
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=DM+Mono:ital,wght@0,400;0,500;1,400&family=Lora:ital,wght@0,400;0,600;1,400&display=swap');

:root {
    --font-display: 'Plus Jakarta Sans', system-ui, sans-serif;
    --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
    --font-mono: 'DM Mono', 'Fira Code', monospace;
    --font-serif: 'Lora', Georgia, serif;

    /* Warm cream & white palette */
    --bg-primary: #faf9f7;
    --bg-secondary: #ffffff;
    --bg-card: #f5f3f0;
    --bg-code: #f0ede8;
    --bg-hover: #ede9e3;

    --border: #e2ddd7;
    --border-light: #ede9e3;

    --text-primary: #1c1917;
    --text-muted: #57534e;
    --text-dim: #a8a29e;

    /* Warm indigo accent */
    --accent: #5b4fcf;
    --accent-bright: #7c6fe0;
    --accent-dim: #c4bef5;
    --accent-glow: rgba(91, 79, 207, 0.08);
    --accent-bg: #eeeafd;

    /* Coral secondary */
    --coral: #e8623a;
    --coral-bg: #fdf0ec;

    /* Semantic */
    --color-true: #16a34a;
    --color-true-bg: #dcfce7;
    --color-false: #dc2626;
    --color-false-bg: #fee2e2;
    --color-string: #b45309;
    --color-number: #0369a1;
    --color-keyword: #7c3aed;
    --color-fn: #0369a1;
    --color-comment: #a8a29e;
    --color-operator: #57534e;
    --color-type: #0f766e;

    --sidebar-width: 248px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 32px;
}

body {
    display: flex;
    min-height: 100vh;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ===================== SIDEBAR ===================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-logo {
    padding: 24px 20px 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.logo-numeral {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.16em;
    color: var(--accent);
    text-transform: uppercase;
    font-weight: 500;
}

.logo-title {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-version {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-dim);
    background: var(--bg-card);
    display: inline-block;
    padding: 1px 8px;
    border-radius: 20px;
    width: fit-content;
    margin-top: 2px;
}

.sidebar-nav {
    padding: 12px 0;
    flex: 1;
}

.nav-section-label {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    padding: 16px 18px 6px;
    font-weight: 500;
}

.nav-link {
    display: block;
    padding: 6px 18px;
    font-family: var(--font-display);
    font-size: 13.5px;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 7px;
    margin: 1px 8px;
    transition: all 0.12s ease;
}

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

.nav-link.active {
    color: var(--accent);
    background: var(--accent-bg);
    font-weight: 600;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-light);
    display: flex;
    gap: 12px;
}

.gh-link, .npm-link {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.12s;
    font-weight: 500;
}

.gh-link:hover {
    color: var(--text-primary);
}

.npm-link:hover {
    color: var(--coral);
}

.gh-link svg, .npm-link svg {
    width: 14px;
    height: 14px;
}

/* ===================== MAIN ===================== */
.main {
    margin-left: var(--sidebar-width);
    flex: 1;
    max-width: 860px;
    padding: 0 56px 80px;
}

/* ===================== HERO ===================== */
.hero {
    position: relative;
    padding: 72px 0 52px;
    overflow: hidden;
}

.hero-bg-text {
    position: absolute;
    top: 10px;
    right: -20px;
    font-family: var(--font-display);
    font-size: 130px;
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1.5px var(--border);
    pointer-events: none;
    user-select: none;
    line-height: 1;
    letter-spacing: -0.02em;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--accent);
    border: 1.5px solid var(--accent-dim);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 20px;
    background: var(--accent-bg);
}

.badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    display: inline-block;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 60px;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    line-height: 1.05;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-family: var(--font-serif);
    font-size: 18px;
    color: var(--text-muted);
    max-width: 520px;
    margin-bottom: 32px;
    line-height: 1.65;
    font-style: italic;
}

.install-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 11px 16px;
    margin-bottom: 10px;
    max-width: 540px;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.install-box:hover {
    border-color: var(--accent-dim);
    box-shadow: var(--shadow-md);
}

.install-label {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    min-width: 28px;
    font-weight: 500;
    background: var(--accent-bg);
    padding: 2px 7px;
    border-radius: 4px;
}

.install-cmd {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-primary);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-dim);
    padding: 4px;
    border-radius: 6px;
    transition: all 0.12s;
    display: flex;
    align-items: center;
}

.copy-btn:hover {
    color: var(--accent);
    background: var(--accent-bg);
}

.copy-btn svg {
    width: 15px;
    height: 15px;
}

/* ===================== DOC SECTIONS ===================== */
.doc-section {
    padding: 52px 0;
    border-top: 1px solid var(--border-light);
}

.doc-section:first-of-type {
    border-top: none;
}

.api-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.api-header .section-title {
    margin-bottom: 0;
}

.api-badge {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    border: 1.5px solid var(--accent-dim);
    padding: 3px 9px;
    border-radius: 20px;
    background: var(--accent-bg);
    font-weight: 500;
}

.section-desc {
    font-family: var(--font-serif);
    font-size: 16.5px;
    color: var(--text-muted);
    margin-bottom: 20px;
    font-style: italic;
    line-height: 1.6;
}

.section-desc code {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent);
    background: var(--accent-bg);
    padding: 1px 6px;
    border-radius: 4px;
    font-style: normal;
}

/* ===================== SIGNATURE BOX ===================== */
.signature-box {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    padding: 13px 18px;
    margin-bottom: 18px;
    box-shadow: var(--shadow-sm);
}

.signature-box code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-primary);
}

.signature-box .type {
    color: var(--color-type);
}

/* ===================== PARAM TABLE ===================== */
.param-table {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.param-row {
    display: grid;
    grid-template-columns: 1fr 1fr 2fr;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-light);
    font-size: 14px;
}

.param-row:last-child {
    border-bottom: none;
}

.param-row.header {
    background: var(--bg-card);
    font-family: var(--font-mono);
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    font-weight: 500;
}

.param-row span {
    display: flex;
    align-items: center;
}

.param-row code {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent);
    background: var(--accent-bg);
    padding: 1px 7px;
    border-radius: 4px;
}

/* ===================== PLAYGROUND CARDS ===================== */
.playground-card {
    background: linear-gradient(135deg, #f8f7ff 0%, #fff9f6 100%);
    border: 1.5px solid var(--accent-dim);
    border-radius: var(--radius-xl);
    padding: 20px 22px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px rgba(91, 79, 207, 0.07);
}

.playground-label {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.playground-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.arith-row {
    gap: 8px;
}

.pg-input {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 9px 14px;
    width: 200px;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-shadow: var(--shadow-sm);
    -moz-appearance: textfield;
}

.pg-input::-webkit-inner-spin-button, .pg-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.pg-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(91, 79, 207, 0.12);
}

.pg-input.small {
    width: 100px;
}

.pg-input.roman-input {
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.pg-arrow {
    font-size: 18px;
    color: var(--text-dim);
}

.op-symbol {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
    min-width: 22px;
    text-align: center;
}

.pg-output {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--accent);
    padding: 8px 18px;
    background: var(--bg-secondary);
    border: 1.5px solid var(--accent-dim);
    border-radius: var(--radius);
    min-width: 110px;
    text-align: center;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.pg-output.error-state {
    color: var(--color-false);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0;
    font-weight: 400;
    border-color: #fca5a5;
    background: var(--color-false-bg);
}

.pg-output.bool-output.true-state {
    color: var(--color-true);
    border-color: #86efac;
    background: var(--color-true-bg);
}

.pg-output.bool-output.false-state {
    color: var(--color-false);
    border-color: #fca5a5;
    background: var(--color-false-bg);
}

.range-output {
    margin-top: 14px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent);
    text-align: left;
    min-width: unset;
    width: 100%;
    letter-spacing: 0.02em;
    line-height: 1.8;
    word-break: break-all;
    background: var(--bg-secondary);
    border-color: var(--border);
    padding: 12px 16px;
}

/* Table grid */
.table-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
    margin-top: 16px;
}

.table-cell {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 6px;
    text-align: center;
    transition: border-color 0.12s, transform 0.12s;
}

.table-cell:hover {
    border-color: var(--accent-dim);
    transform: translateY(-1px);
}

.table-cell .arabic {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-dim);
    display: block;
}

.table-cell .roman {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    display: block;
    margin-top: 2px;
}

/* Run button */
.run-btn {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    color: #ffffff;
    background: var(--accent);
    border: none;
    border-radius: var(--radius);
    padding: 9px 18px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
    box-shadow: 0 2px 8px rgba(91, 79, 207, 0.28);
}

.run-btn:hover {
    background: var(--accent-bright);
    box-shadow: 0 4px 14px rgba(91, 79, 207, 0.35);
}

.run-btn:active {
    transform: scale(0.97);
}

/* ===================== CODE BLOCKS ===================== */
.code-block {
    background: var(--bg-code);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 8px;
}

.code-block.compact {
    border-radius: var(--radius);
    margin-bottom: 0;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 9px 14px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
}

.code-header span {
    font-family: var(--font-mono);
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    font-weight: 500;
}

.copy-btn-sm {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    color: var(--text-dim);
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 3px 9px;
    cursor: pointer;
    transition: all 0.12s;
}

.copy-btn-sm:hover {
    color: var(--accent);
    border-color: var(--accent-dim);
    background: var(--accent-bg);
}

pre {
    padding: 18px 20px;
    overflow-x: auto;
}

code {
    font-family: var(--font-mono);
    font-size: 13.5px;
    line-height: 1.7;
}

/* Light syntax highlighting */
.kw {
    color: var(--color-keyword);
    font-weight: 500;
}

.fn {
    color: var(--color-fn);
}

.str {
    color: var(--color-string);
}

.num {
    color: var(--color-number);
}

.cm {
    color: var(--color-comment);
    font-style: italic;
}

.op {
    color: var(--color-operator);
}

.type {
    color: var(--color-type);
}

/* ===================== SANDBOX ===================== */
.sandbox-section {
    background: linear-gradient(140deg, #f5f3ff 0%, #fff7f5 60%, #f0fdf4 100%);
    border: 1.5px solid var(--accent-dim);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin: 0 -8px;
}

.sandbox-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 24px;
    box-shadow: var(--shadow-md);
}

.sandbox-editor, .sandbox-output {
    display: flex;
    flex-direction: column;
}

.sandbox-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.sandbox-label {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    flex: 1;
    font-weight: 500;
}

.sandbox-code {
    flex: 1;
    min-height: 340px;
    background: var(--bg-secondary);
    border: none;
    border-right: 1.5px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    padding: 20px;
    resize: none;
    outline: none;
    tab-size: 2;
}

.sandbox-code:focus {
    box-shadow: inset 0 0 0 2px rgba(91, 79, 207, 0.12);
}

.sandbox-output {
    background: var(--bg-primary);
}

.sandbox-result {
    flex: 1;
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.8;
    overflow-y: auto;
    min-height: 340px;
}

.sandbox-hint {
    color: var(--text-dim);
    font-style: italic;
}

.log-line {
    padding: 2px 0;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
}

.log-line.error-line {
    color: var(--color-false);
}

.log-line .log-prefix {
    color: var(--text-dim);
    user-select: none;
}

/* ===================== ROADMAP ===================== */
.roadmap-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--coral);
    border: 1.5px solid #f9b8a0;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 14px;
    text-transform: uppercase;
    background: var(--coral-bg);
    font-weight: 500;
}

.roadmap-badge::before {
    content: '✦';
    font-size: 9px;
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 14px;
    margin-top: 28px;
}

.roadmap-card {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 22px;
    transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.roadmap-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--coral));
    opacity: 0;
    transition: opacity 0.15s;
}

.roadmap-card:hover {
    border-color: var(--accent-dim);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.roadmap-card:hover::after {
    opacity: 1;
}

.roadmap-icon {
    font-size: 26px;
    margin-bottom: 10px;
}

.roadmap-card h3 {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    margin-bottom: 6px;
}

.roadmap-card p {
    font-size: 13.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.5;
}

/* ===================== FOOTER ===================== */
.doc-footer {
    padding: 48px 0 32px;
    border-top: 1px solid var(--border-light);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
}

.doc-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.doc-footer a:hover {
    text-decoration: underline;
}

.footer-roman {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 800;
    color: var(--border);
    margin-top: 16px;
    letter-spacing: -0.02em;
}

/* ===================== SCROLLBAR ===================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-dim);
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 900px) {
    .sidebar {
        display: none;
    }

    .main {
        margin-left: 0;
        padding: 0 24px 60px;
    }

    .sandbox-wrapper {
        grid-template-columns: 1fr;
    }

    .sandbox-code {
        border-right: none;
        border-bottom: 1.5px solid var(--border);
    }

    .hero-bg-text {
        font-size: 80px;
    }

    .hero-title {
        font-size: 42px;
    }

    .roadmap-grid {
        grid-template-columns: 1fr;
    }

    .sandbox-section {
        padding: 24px;
        margin: 0;
    }
}

/* ===================== COPY FEEDBACK ===================== */
.copy-btn.copied, .copy-btn-sm.copied {
    color: var(--color-true) !important;
}

/* ===================== ANIMATIONS ===================== */
@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes popIn {
    0% {
        transform: scale(0.95);
        opacity: 0.7;
    }
    60% {
        transform: scale(1.03);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.pg-output.updated {
    animation: popIn 0.22s ease;
}

.doc-section {
    animation: fadeSlideIn 0.25s ease both;
}