:root {
    --text-primary: #f0f0f5;
    --text-secondary: #9aa0a6;
    --accent-primary: #6544ff;
    --accent-secondary: #3113a8;
    --fill-page-bg: #000000;
    --fill-card: #12141c;
    --fill-soft: rgba(255, 255, 255, 0.03);
    --border-primary: rgba(255, 255, 255, 0.1);
    --border-accent: rgba(255, 255, 255, 0.08);
    --shadow-card: 0 14px 34px rgba(0, 0, 0, 0.45);
    --surface-header: rgba(0, 0, 0, 0.72);
    --content-width: min(95vw, 1440px);
    --header-height: clamp(58px, 6.2vw, 74px);
    --logo-size: clamp(56px, 4vw, 64px);
    --brand-size: clamp(1.15rem, 1.6vw, 1.4rem);
}

* {
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
}

body {
    margin: 0;
    color: var(--text-primary);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: clamp(14px, 0.95vw, 16px);
    background: var(--fill-page-bg);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
}

a:hover {
    color: #ffffff;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

.app-shell {
    min-height: 100vh;
}

.challenge-shell {
    display: flex;
    flex-direction: column;
}

.challenge-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    width: 100%;
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--surface-header);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.challenge-header > * {
    pointer-events: auto;
}

.challenge-header-inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
}

.brand,
.brand:hover {
    color: inherit;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.brand-logo {
    width: var(--logo-size);
    height: var(--logo-size);
    flex-shrink: 0;
    display: block;
    object-fit: contain;
    background-color: transparent;
    border-radius: 8px;
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.brand-title,
.page-title,
.section-title {
    color: #ffffff;
}

.brand-title {
    font-size: var(--brand-size);
    font-weight: 700;
    letter-spacing: 1px;
}

.brand-subtitle,
.preview-label {
    color: var(--text-secondary);
    line-height: 1.6;
}

.section-copy,
.page-subtitle {
    color: #ffffff;
    line-height: 1.6;
}

.brand-subtitle {
    font-size: 0.78rem;
}

.challenge-status {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}

.challenge-back-link {
    margin-top: 6px;
    min-height: 36px;
    padding: 7px 14px;
    border-radius: 999px;
}

.challenge-status-label {
    font-size: 0.92rem;
    font-weight: 600;
    color: #ffffff;
}

.challenge-status-meta,
.challenge-card-meta,
.ad-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px;
}

button,
.button,
.button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 16px;
    border: 1px solid transparent;
    font: inherit;
    font-weight: 700;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.main.challenge-main {
    flex: 1 1 auto;
    padding: 24px;
    padding-top: calc(var(--header-height) + 24px);
    min-width: 0;
    min-height: 100vh;
    overflow-x: hidden;
}

.page {
    display: grid;
    gap: 18px;
    width: min(100%, 760px);
    margin: 0 auto;
}

.hero-page,
.challenge-page {
    padding-top: 28px;
    padding-bottom: 32px;
}

.hero-panel,
.card {
    background: var(--fill-card);
    border: none;
    border-radius: 18px;
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.challenge-hero-card {
    padding: 20px 22px;
}

.challenge-summary-card {
    padding: 20px 22px;
}

.challenge-grid,
.challenge-layout {
    display: grid;
    gap: 18px;
}

.challenge-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.challenge-feed-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.challenge-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
}

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

.challenge-layout-dual {
    grid-template-columns: repeat(2, minmax(320px, 1fr));
}

.challenge-card,
.challenge-preview-card {
    padding: 24px 28px;
}

.challenge-card {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.challenge-card-meta-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.challenge-card-wide {
    min-height: 100%;
}

.challenge-card-body {
    padding: 0;
    display: grid;
    gap: 14px;
    margin-bottom: 24px;
}

.challenge-card-head {
    display: grid;
    gap: 10px;
    margin-bottom: 0;
}

.challenge-card-copy {
    margin: 0;
    max-width: 72ch;
}

.challenge-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.challenge-open-link {
    min-height: 40px;
    padding: 8px 14px;
    border-radius: 999px;
}

.challenge-form,
.challenge-form-grid {
    display: grid;
    gap: 12px;
}

.challenge-form {
    margin-top: 18px;
}

.challenge-form-grid {
    grid-template-columns: repeat(2, minmax(240px, 1fr));
}

.field-group {
    display: grid;
    gap: 8px;
}

label,
.eyebrow {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #cfd2db;
}

input,
textarea,
select {
    width: 100%;
    min-height: 44px;
    border-radius: 10px;
    border: 1px solid var(--border-primary);
    background: rgba(255, 255, 255, 0.02);
    color: #ffffff;
    padding: 11px 14px;
    font: inherit;
}

input:focus,
textarea:focus,
select:focus,
button:focus,
.button:focus,
.button-secondary:focus {
    outline: 3px solid rgba(86, 32, 245, 0.28);
    outline-offset: 2px;
}

button,
.button {
    border-radius: 12px;
    background: var(--accent-primary);
    color: #ffffff;
    cursor: pointer;
}

button:hover,
.button:hover {
    background: #7558ff;
}

.button-secondary {
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.06);
    border-color: transparent;
    color: #ffffff;
}

.button-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.preview-meta-block {
    margin-top: 18px;
    padding: 0;
    border-radius: 0;
    background: transparent;
    border: none;
}

.secret-link {
    display: inline-block;
    margin-top: 8px;
    word-break: break-all;
    color: var(--text-secondary);
}

.secret-link:hover {
    color: #ffffff;
}

.ad-surface {
    display: grid;
    gap: 14px;
    padding: 18px 0 0;
    border-radius: 0;
    background: transparent;
    border: none;
}

.challenge-code-card {
    padding: 24px 28px;
}

.ad-surface-hero {
    min-height: 280px;
    align-content: start;
    padding-top: 8px;
    background: transparent;
}

.ad-hero-title {
    font-size: clamp(2rem, 4vw, 3.3rem);
    line-height: 1.1;
    margin: 0;
}

.headline-preview {
    font-size: 1.15rem;
    font-weight: 700;
}

.ad-action {
    justify-self: start;
}

.headline-preview {
    background: rgba(255, 255, 255, 0.02);
}

.reach-card {
    display: grid;
    gap: 10px;
}

.reach-estimate {
    font-size: 1.45rem;
    color: #ffffff;
}

.accent-text {
    color: #ffffff;
    font-weight: 700;
}

.code-preview,
.pixel-preview {
    margin: 0;
    padding: 18px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.04);
    border: none;
    color: #d6d8e2;
    font-size: 0.92rem;
    line-height: 1.65;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

.challenge-feed-list .challenge-card {
    padding: 0;
}

.challenge-feed-list .challenge-card-body {
    padding: 20px 22px 0;
    margin-bottom: 16px;
    gap: 12px;
}

.challenge-feed-list .challenge-card-footer {
    padding: 0 22px 18px;
    border-top: none;
}

.challenge-feed-list .challenge-open-link {
    background: rgba(255, 255, 255, 0.04);
    border-color: transparent;
}

.challenge-feed-list .challenge-open-link:hover {
    background: rgba(255, 255, 255, 0.08);
}

.ad-surface-code {
    min-height: 100%;
}

.sandbox-frame {
    width: 100%;
    min-height: 320px;
    border-radius: 16px;
    border: none;
    background: #ffffff;
}

.challenge-card:hover,
.challenge-preview-card:hover,
.challenge-hero-card:hover {
    box-shadow: var(--shadow-card);
}

@media (max-width: 920px) {
    .challenge-layout,
    .challenge-layout-dual,
    .challenge-form-grid {
        grid-template-columns: 1fr;
    }

    .challenge-header-inner {
        align-items: center;
    }

    .main.challenge-main {
        padding: 20px;
        padding-top: calc(var(--header-height) + 20px);
    }
}

@media (max-width: 640px) {
    .challenge-header,
    .main.challenge-main {
        padding: 16px;
    }

    .challenge-header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .challenge-status {
        align-items: flex-start;
    }

    .challenge-card,
    .challenge-preview-card,
    .challenge-hero-card,
    .challenge-summary-card,
    .challenge-code-card {
        padding: 18px;
    }

    .challenge-card-body {
        gap: 12px;
        margin-bottom: 18px;
    }

    .challenge-card-footer {
        flex-direction: column;
        align-items: flex-start;
    }

    .ad-hero-title {
        font-size: 1.7rem;
    }
}