:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --text: #1d2430;
    --muted: #5b6677;
    --accent: #0b6fcf;
    --accent-2: #00a884;
    --border: #d7dfeb;
    --code-bg: #ecf2fa;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", "Noto Sans", "Helvetica Neue", sans-serif;
    color: var(--text);
    background:
        radial-gradient(900px 350px at 20% -10%, #d8ecff 0%, transparent 60%),
        radial-gradient(800px 300px at 90% -20%, #c9ffe8 0%, transparent 65%),
        var(--bg);
    line-height: 1.55;
}

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

.container {
    width: min(980px, calc(100% - 32px));
    margin: 0 auto;
    padding: 24px 0 42px;
}

header {
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 18px;
}

h1 {
    margin: 0;
    font-size: clamp(1.5rem, 2.4vw, 2rem);
}

.subtitle {
    margin: 8px 0 0;
    color: var(--muted);
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.nav-link {
    text-decoration: none;
    color: var(--accent);
    border: 1px solid var(--border);
    background: #f8fbff;
    border-radius: 10px;
    padding: 8px 11px;
    font-weight: 600;
}

.nav-link.active {
    color: #fff;
    border-color: var(--accent);
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.panel {
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 16px;
}

.emoji-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.emoji-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 8px;
}

.emoji-list li .emoji-bullet {
    font-size: 1.3em;
    line-height: 1.4;
    flex-shrink: 0;
    min-width: 1.6em;
    text-align: center;
    margin-top: -0.15em
}

.hero-panel {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(500px 220px at 85% -25%, #d2f6ea 0%, transparent 65%),
        linear-gradient(180deg, #ffffff, #f8fcff);
}

.hero-badge {
    display: inline-block;
    margin: 0 0 10px;
    padding: 5px 10px;
    border-radius: 999px;
    border: 1px solid #b9d6ff;
    background: #eaf4ff;
    color: #174a83;
    font-size: 0.84rem;
    font-weight: 700;
}

.hero-title {
    margin-bottom: 10px;
    font-size: clamp(1.5rem, 3.2vw, 2.1rem);
    line-height: 1.2;
}

.hero-subtitle {
    margin: 0;
    max-width: 64ch;
    color: var(--muted);
}

.hero-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 8px 14px;
    border-radius: 10px;
    border: 1px solid transparent;
    text-decoration: none;
    font-weight: 700;
}

.hero-btn--primary {
    color: #ffffff;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.hero-btn--secondary {
    color: var(--accent);
    border-color: var(--border);
    background: #ffffff;
}

.stat-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 16px;
}

.stat-card {
    margin-bottom: 0;
}

.stat-card h2 {
    font-size: 1.1rem;
}

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

h2 {
    margin: 0 0 10px;
    font-size: 1.3rem;
}

ul {
    padding-left: 20px;
    margin: 8px 0;
}

li {
    margin: 6px 0;
}

code {
    background: var(--code-bg);
    border-radius: 6px;
    padding: 1px 6px;
    font-family: Consolas, "Cascadia Code", monospace;
}

.footer {
    color: var(--muted);
    font-size: 0.95rem;
}

.footer-github-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
}

.footer-github-link:hover {
    color: var(--text);
}

.icon-heading {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-heading svg {
    flex-shrink: 0;
    color: var(--accent);
}

.reference-layout {
    display: grid;
    gap: 16px;
    grid-template-columns: minmax(220px, 270px) minmax(0, 1fr);
    align-items: start;
}

.reference-sidebar {
    position: sticky;
    top: 14px;
    max-height: calc(100vh - 28px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.reference-sidebar h2 {
    margin-bottom: 8px;
}

.reference-sidebar-nav {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    flex: 1 1 auto;
    gap: 8px;
    margin-top: 10px;
    min-height: 0;
    overflow-y: auto;
    padding-right: 4px;
    scrollbar-gutter: stable;
}

.reference-nav-group {
    flex: 0 0 auto;
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #f8fbff;
    overflow: hidden;
}

.reference-nav-group-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    list-style: none;
    cursor: pointer;
    padding: 9px 10px;
    font-weight: 600;
}

.reference-nav-group-summary::-webkit-details-marker {
    display: none;
}

.reference-nav-group[open] {
    background: #eef6ff;
}

.reference-nav-group-summary strong {
    color: #1f4f8a;
    font-size: 0.83rem;
    padding: 2px 7px;
    border-radius: 999px;
    background: #e6f1ff;
}

.reference-nav-function-list {
    list-style: none;
    margin: 0;
    padding: 0 8px 8px;
}

.reference-nav-function-list li {
    margin: 0;
}

.reference-nav-function-link {
    display: block;
    text-decoration: none;
    color: #173d66;
    border-radius: 8px;
    padding: 5px 8px;
    font-size: 0.94rem;
}

.reference-nav-function-link:hover {
    background: #dcebff;
}

.reference-content {
    min-width: 0;
}

.reference-group {
    scroll-margin-top: 14px;
}

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

.reference-function-list {
    list-style: none;
    margin: 12px 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.reference-function-item {
    margin: 0;
    padding: 12px 12px 10px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fbfdff;
}

.reference-function-item p {
    margin: 0 0 8px;
}

.reference-signature code {
    font-weight: 700;
    background: #e8f1fc;
}

.reference-example,
.reference-notes {
    color: var(--muted);
    font-size: 0.95rem;
}

.operations-hero .hero-subtitle {
    max-width: 70ch;
}

.operations-intro-note {
    margin: 0 0 12px;
    color: var(--muted);
}

.operations-step-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.operations-step-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f6fbff);
    padding: 14px;
}

.operations-step-index {
    display: inline-block;
    margin: 0 0 8px;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    color: #205a96;
    background: #eaf3ff;
}

.operations-step-card h3 {
    margin: 0 0 8px;
    font-size: 1.08rem;
}

.operations-step-card p {
    margin: 0 0 9px;
}

.operations-step-example {
    color: #2c455f;
}

.operations-step-figure {
    margin: 8px 0 10px;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    background: #edf4fc;
}

.operations-step-figure img,
.operations-step-figure video {
    display: block;
    width: 100%;
    height: auto;
}

.operations-step-notes {
    margin: 0;
}

.help-subsection + .help-subsection {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}

.help-subsection-header {
    margin: 0 0 4px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.byok-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.byok-card {
    margin: 0;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f7fbff);
}

.byok-card h3 {
    margin: 0 0 6px;
    font-size: 1.08rem;
}

.byok-tag {
    margin: 0 0 10px;
    font-size: 0.88rem;
    color: #205a96;
    background: #eaf3ff;
    border: 1px solid #c3daf8;
    border-radius: 999px;
    display: inline-block;
    padding: 3px 10px;
}

.byok-card p {
    margin: 0 0 8px;
}

.byok-card ol {
    padding-left: 20px;
    margin: 0 0 10px;
}

.byok-card ol li {
    margin: 5px 0;
    line-height: 1.5;
}

.byok-steps {
    padding-left: 22px;
    margin: 10px 0 0;
}

.byok-steps li {
    margin: 7px 0;
    line-height: 1.55;
}

.byok-note {
    color: var(--muted);
    font-size: 0.94rem;
    margin-top: 6px;
}

.byok-callout {
    background: linear-gradient(180deg, #ffffff, #f2fbf7);
}

@media (max-width: 640px) {
    .container {
        width: calc(100% - 20px);
        padding: 14px 0 24px;
    }

    header,
    .panel {
        padding: 14px;
        border-radius: 12px;
    }

    .hero-title {
        font-size: 1.42rem;
    }

    .hero-btn {
        width: 100%;
    }

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

    .reference-layout {
        grid-template-columns: 1fr;
    }

    .reference-sidebar {
        position: static;
        max-height: none;
        display: block;
    }

    .reference-sidebar-nav {
        flex-direction: column;
        overflow-y: visible;
        min-height: auto;
        padding-right: 0;
    }

    .operations-step-grid {
        grid-template-columns: 1fr;
    }

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