:root {
    --bg: #0b1020;
    --surface: #121a2c;
    --surface-2: #182238;
    --border: #263450;
    --text: #f5f7fb;
    --muted: #98a4ba;
    --primary: #6ea8fe;
    --success: #55d187;
    --danger: #ff6b6b;
    --warning: #ffc857;
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}

.shell {
    width: min(1180px, calc(100% - 24px));
    margin: 0 auto;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;

    background: rgba(11, 16, 32, 0.94);
    backdrop-filter: blur(12px);

    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    min-height: 64px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 16px;
}

.brand {
    font-size: 20px;
    font-weight: 800;
}

.brand-sub {
    display: none;
    color: var(--muted);
    font-size: 13px;
}

.nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
}

.nav a {
    white-space: nowrap;

    padding: 10px 12px;

    border-radius: 10px;

    color: var(--muted);
}

.nav a:hover {
    background: var(--surface);
    color: var(--text);
}

.main {
    padding: 24px 0 48px;
}

.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    margin: 0 0 8px;
    font-size: 30px;
}

.page-header p {
    margin: 0;
    color: var(--muted);
}

.grid {
    display: grid;
    gap: 16px;
}

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

.card {
    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius);

    padding: 18px;
}

.stat-value {
    margin-top: 8px;

    font-size: 32px;
    font-weight: 800;
}

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

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

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

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

.actions {
    display: flex;
    flex-wrap: wrap;

    gap: 10px;

    margin-top: 18px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    min-height: 44px;

    padding: 10px 16px;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: var(--surface-2);
    color: var(--text);

    cursor: pointer;
}

.button-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #07101f;

    font-weight: 700;
}

.button-danger {
    background: transparent;
    border-color: var(--danger);
    color: var(--danger);
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;

    min-width: 720px;
}

th,
td {
    padding: 12px;

    text-align: left;

    border-bottom: 1px solid var(--border);
}

th {
    color: var(--muted);
    font-size: 13px;
}

.badge {
    display: inline-flex;
    align-items: center;

    padding: 5px 9px;

    border-radius: 999px;

    background: var(--surface-2);

    font-size: 12px;
    font-weight: 700;
}

.badge-success {
    color: var(--success);
}

.badge-danger {
    color: var(--danger);
}

.form-grid {
    display: grid;
    gap: 16px;
}

label {
    display: grid;
    gap: 7px;

    font-size: 14px;
    font-weight: 600;
}

input,
textarea,
select {
    width: 100%;

    padding: 12px 14px;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: #0d1424;
    color: var(--text);

    font: inherit;
}

textarea {
    min-height: 110px;
    resize: vertical;
}

.code {
    overflow-wrap: anywhere;

    padding: 12px;

    border-radius: 12px;

    background: #080d18;
    border: 1px solid var(--border);

    font-family: monospace;
    font-size: 13px;
}

.detail-grid {
    display: grid;
    gap: 14px;
}

.detail-row {
    display: grid;
    gap: 6px;

    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.detail-label {
    color: var(--muted);
    font-size: 13px;
}

.empty {
    text-align: center;

    padding: 36px 16px;

    color: var(--muted);
}

.api-key-box {
    border: 1px solid var(--warning);
}

@media (min-width: 720px) {
    .brand-sub {
        display: block;
    }

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

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

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


/* STEP 6 mobile navigation */

.topbar-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 12px;
    padding-bottom: 12px;
}

.nav {
    width: 100%;
    padding-bottom: 3px;
}

.nav form {
    flex: 0 0 auto;
}

.nav .button {
    min-height: 40px;
    white-space: nowrap;
}


@media (min-width: 860px) {

    .topbar-inner {
        flex-direction: row;
        align-items: center;
        padding-top: 0;
        padding-bottom: 0;
    }

    .nav {
        width: auto;
    }

}


/* STEP 7 responsive navigation */

.topbar-inner {
    display: block;
    padding-top: 12px;
    padding-bottom: 12px;
}

.brand-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.menu-toggle {
    width: 46px;
    height: 42px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    gap: 5px;

    padding: 0;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: var(--surface);
    cursor: pointer;
}

.menu-toggle span {
    display: block;

    width: 20px;
    height: 2px;

    border-radius: 999px;

    background: var(--text);

    transition:
        transform 0.2s ease,
        opacity 0.2s ease;
}

.menu-toggle.menu-open
span:nth-child(1) {
    transform:
        translateY(7px)
        rotate(45deg);
}

.menu-toggle.menu-open
span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.menu-open
span:nth-child(3) {
    transform:
        translateY(-7px)
        rotate(-45deg);
}

.nav {
    display: none;

    width: 100%;

    flex-direction: column;

    gap: 8px;

    overflow: visible;

    padding-top: 12px;
}

.nav.nav-open {
    display: flex;
}

.nav a {
    width: 100%;

    padding: 12px 14px;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: var(--surface);
}

.nav form {
    width: 100%;
}

.nav form .button {
    width: 100%;
}

@media (min-width: 860px) {

    .topbar-inner {
        min-height: 68px;

        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;

        padding-top: 0;
        padding-bottom: 0;
    }

    .brand-row {
        display: block;
    }

    .menu-toggle {
        display: none;
    }

    .nav {
        display: flex;

        width: auto;

        flex-direction: row;
        align-items: center;

        padding-top: 0;
    }

    .nav a {
        width: auto;

        border: 0;
        background: transparent;
    }

    .nav form {
        width: auto;
    }

    .nav form .button {
        width: auto;
    }
}


/* STEP 11 developer experience */

.pre-code {
    white-space: pre-wrap;
    word-break: break-word;
    overflow-wrap: anywhere;

    font-family:
        ui-monospace,
        SFMono-Regular,
        Menlo,
        Monaco,
        Consolas,
        monospace;

    line-height: 1.6;
}


/* STEP 13 billing usage */

.usage-row {
    padding: 18px 0;
    border-bottom: 1px solid var(--border-color, #26334d);
}

.usage-row:last-child {
    border-bottom: 0;
}

.usage-row-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 10px;
}

.usage-track {
    width: 100%;
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
}

.usage-fill {
    height: 100%;
    min-width: 0;
    border-radius: inherit;
    background: currentColor;
}

.usage-meta {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-top: 8px;
    font-size: 0.9rem;
    opacity: 0.85;
}

.usage-status {
    text-transform: capitalize;
    font-weight: 700;
}

.usage-status-ok {
    opacity: 0.9;
}

.usage-status-warning {
    font-weight: 800;
}

.usage-status-exhausted {
    font-weight: 900;
}

.usage-status-unlimited {
    opacity: 0.9;
}

.feature-list {
    display: grid;
    gap: 10px;
}

.feature-item {
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    word-break: break-word;
}



/* STEP 15 checkout plans */

.billing-plan-grid {
    display: grid;
    grid-template-columns:
        repeat(
            auto-fit,
            minmax(220px, 1fr)
        );
    gap: 16px;
    margin-top: 18px;
}

.billing-plan-card {
    padding: 18px;
    border: 1px solid
        var(--border-color, #26334d);
    border-radius: 16px;
    background:
        rgba(255, 255, 255, 0.025);
}

.billing-plan-card h3 {
    margin-top: 0;
}

.billing-plan-card form {
    margin-top: 16px;
}

.billing-plan-card button {
    width: 100%;
}



/* Public Beta surface */

.public-hero {
    max-width: 860px;
    padding: 72px 0 48px;
}

.public-hero h1 {
    max-width: 760px;
    margin:
        18px 0
        20px;

    font-size:
        clamp(
            2.3rem,
            8vw,
            4.8rem
        );

    line-height: 1.02;
}

.public-lead {
    max-width: 680px;
    font-size: 1.15rem;
    line-height: 1.7;
}

.public-beta-badge {
    display: inline-flex;
    padding: 8px 12px;

    border:
        1px solid
        var(
            --border-color,
            #26334d
        );

    border-radius: 999px;
    font-weight: 700;
}

.public-feature-grid {
    display: grid;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(
                220px,
                1fr
            )
        );

    gap: 16px;
    margin-bottom: 24px;
}

.public-beta-note {
    margin-bottom: 40px;
}

.public-legal {
    max-width: 820px;
    margin: 32px auto;
}

.public-legal h2 {
    margin-top: 30px;
}

.public-legal p {
    line-height: 1.7;
}

.site-footer {
    margin-top: 48px;

    border-top:
        1px solid
        var(
            --border-color,
            #26334d
        );
}

.site-footer-inner {
    display: flex;

    align-items: center;
    justify-content: space-between;

    gap: 20px;

    padding-top: 22px;
    padding-bottom: 22px;
}

.site-footer-links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.site-footer a {
    color: inherit;
}

@media (
    max-width: 640px
) {
    .public-hero {
        padding-top: 44px;
    }

    .site-footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }
}