:root {
    --bg: #000220;
    --surface: #0f1a33;
    --surface-2: #15233f;
    --border: #213252;
    --text: #ffffff;
    --muted: #8a9abd;
    --danger: #ff8f8f;
    --radius: 10px;
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
}

body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font:
        15px/1.6 system-ui,
        -apple-system,
        "Segoe UI",
        Roboto,
        sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

h1,
h2 {
    margin: 0;
    font-weight: 600;
    letter-spacing: -0.01em;
}
h1 {
    font-size: 26px;
}
h2 {
    font-size: 15px;
    color: var(--muted);
    font-weight: 500;
    margin-bottom: 12px;
}

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

/* nav */

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 24px;
}
.brand {
    font-weight: 600;
}
.nav nav {
    display: flex;
    align-items: center;
    gap: 18px;
}
.nav nav a,
.nav nav .link {
    color: var(--muted);
}
.nav nav a.active,
.nav nav a:hover,
.nav nav .link:hover {
    color: var(--text);
    text-decoration: none;
}
.nav form {
    margin: 0;
}

main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px 24px 80px;
}

/* buttons */

.button,
button {
    font: inherit;
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 16px;
    cursor: pointer;
    display: inline-block;
    line-height: 1.4;
    transition:
        border-color 0.15s,
        background 0.15s;
}
.button:hover,
button:hover {
    border-color: var(--muted);
    text-decoration: none;
}
.button.primary {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
}
.button.primary:hover {
    background: #dfe6f5;
}
.button.danger {
    color: var(--danger);
}
.button.danger:hover {
    border-color: var(--danger);
}
.button.small {
    padding: 4px 10px;
    font-size: 13px;
}
button.link {
    border: 0;
    padding: 0;
    background: none;
}
button:disabled {
    opacity: 0.4;
    cursor: default;
}

/* layout pieces */

.head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin: 16px 0 24px;
}
.head p {
    margin: 4px 0 0;
}

.toolbar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}
.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 4px;
}
.chip {
    font-size: 13px;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 4px 12px;
}
.chip:hover {
    color: var(--text);
    text-decoration: none;
}
.chip.on {
    color: var(--bg);
    background: var(--text);
    border-color: var(--text);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin: 20px 0;
}
.actions form {
    margin: 0;
}

.badge {
    font-size: 12px;
    font-weight: 500;
    vertical-align: middle;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 2px 8px;
}
.badge.danger {
    color: var(--danger);
    border-color: var(--danger);
}

.empty {
    color: var(--muted);
    padding: 48px 0;
    text-align: center;
}

/* gallery */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition:
        border-color 0.15s,
        transform 0.15s;
}
.card:hover {
    border-color: var(--muted);
    transform: translateY(-2px);
}

.thumb {
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 16 / 10;
    background: var(--surface-2);
    overflow: hidden;
}
.thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.placeholder {
    color: var(--muted);
    font-size: 14px;
}

.card-body {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 12px 14px;
}
.card-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.card-text .title {
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* star */

.star-form {
    margin: 0;
}
.star {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    border-radius: 999px;
    font-size: 13px;
    color: var(--muted);
}
.star svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.6;
    stroke-linejoin: round;
}
.star:hover:not(:disabled) {
    color: var(--text);
}
.star.on {
    color: var(--text);
    border-color: var(--text);
}
.star.on svg {
    fill: currentColor;
}

/* page detail */

.description {
    white-space: pre-line;
    max-width: 720px;
    margin: 0;
}

.preview {
    position: relative;
    aspect-ratio: 16 / 10;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
}
.preview iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}
.preview .fullscreen {
    position: absolute;
    right: 12px;
    bottom: 12px;
    background: var(--bg);
    opacity: 0.85;
}

.stargazers {
    margin-top: 32px;
}
.stargazers p {
    margin: 0;
}

/* forms */

.form {
    display: flex;
    flex-direction: column;
    gap: 18px;
    max-width: 560px;
}
.form.narrow {
    max-width: 360px;
    margin: 40px auto;
}
.form label {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.form label > span,
.form legend {
    font-size: 13px;
    color: var(--muted);
}
.form small {
    font-size: 12px;
    color: var(--muted);
}
.form fieldset {
    display: flex;
    flex-direction: column;
    gap: 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px 16px;
    margin: 0;
}
.form legend {
    padding: 0 6px;
}
.form .check {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}
.form .check span {
    color: var(--text);
    font-size: 14px;
}

input,
select,
textarea {
    font: inherit;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 9px 12px;
    width: 100%;
}
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--muted);
}
input:disabled {
    color: var(--muted);
}
textarea {
    resize: vertical;
}
input[type="checkbox"] {
    width: 16px;
    height: 16px;
    padding: 0;
    accent-color: #fff;
}
input[type="file"] {
    padding: 8px;
    color: var(--muted);
}
input[type="file"]::file-selector-button {
    font: inherit;
    font-size: 13px;
    color: var(--text);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 4px 10px;
    margin-right: 10px;
    cursor: pointer;
}
.current-thumb {
    width: 160px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.inline-form {
    flex-direction: row;
    align-items: flex-start;
    max-width: 480px;
}
.inline-form label {
    flex: 1;
}

/* account */

.block {
    margin-top: 36px;
}
.rows {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--border);
}
.rows li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}
.rows li > :last-child {
    margin-left: auto;
}
.rows form {
    margin: 0;
}

/* challenge text */

.prose {
    max-width: 720px;
}
.prose h2,
.prose h3 {
    color: var(--text);
    margin: 28px 0 10px;
    font-weight: 600;
}
.prose h2 {
    font-size: 22px;
}
.prose h3 {
    font-size: 17px;
}
.prose a {
    text-decoration: underline;
    text-underline-offset: 3px;
}
.prose code {
    background: var(--surface-2);
    padding: 1px 6px;
    border-radius: 6px;
}
.prose hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 28px 0;
}

/* source */

.source {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: auto;
    font-size: 13px;
}
.source .highlight,
.source .highlighttable,
.source pre {
    background: var(--surface) !important;
    margin: 0;
}
.source .highlighttable {
    border-collapse: collapse;
    width: 100%;
}
.source .linenos {
    color: var(--muted);
    user-select: none;
    padding: 0 12px;
    border-right: 1px solid var(--border);
}
.source pre {
    padding: 12px 16px;
    line-height: 1.5;
}

/* errors */

.error {
    text-align: center;
    padding: 80px 0;
}
.error h1 {
    font-size: 64px;
}
.error p {
    margin: 8px 0 28px;
}

/* toasts */

#toasts {
    position: fixed;
    right: 20px;
    bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 10;
}
.toast {
    min-width: 220px;
    max-width: 360px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--text);
    border-radius: var(--radius);
    padding: 12px 16px;
    font-size: 14px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    cursor: pointer;
    opacity: 0;
    transform: translateY(8px);
    transition:
        opacity 0.25s,
        transform 0.25s;
}
.toast.show {
    opacity: 1;
    transform: none;
}
.toast-error {
    border-left-color: var(--danger);
}

/* phones */

@media (max-width: 640px) {
    .nav {
        padding: 16px;
        flex-wrap: wrap;
    }
    main {
        padding: 8px 16px 64px;
    }
    .head {
        flex-direction: column;
        align-items: flex-start;
    }
    .grid {
        grid-template-columns: 1fr;
    }
    .preview {
        aspect-ratio: 3 / 4;
    }
    .inline-form {
        flex-direction: column;
    }
    #toasts {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }
    .toast {
        max-width: none;
    }
}