:root {
    --color-border: #ddd;
    --color-muted: #666;
    --color-bg-soft: #f7f7f7;
    --color-danger: #b00020;
    --radius-card: 14px;
    --space-page: 24px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    padding: var(--space-page);
    line-height: 1.5;
    color: #111;
}

h1,
h2,
h3 {
    line-height: 1.2;
}

a {
    color: inherit;
}

.card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 18px;
    margin-bottom: 18px;
    background: white;
}

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

button,
.button-link {
    display: inline-block;
    padding: 10px 14px;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    background: #eee;
    color: #111;
    font-size: 1rem;
}

button:hover,
.button-link:hover {
    background: #e2e2e2;
}

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

textarea,
input[type="number"],
input[type="text"],
input[type="url"],
input[type="email"],
select {
    width: 100%;
    padding: 10px;
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

img {
    max-width: 100%;
}

audio {
    width: 100%;
}

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

.button-row form {
    margin: 0;
}

.status-bar {
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 1.05rem;
    border: 1px solid var(--color-border);
    background: var(--color-bg-soft);
}

.status-waiting {
    background: #f7f7f7;
}

.status-videocall {
    background: #eef5ff;
}

.status-image_review {
    background: #fff7e6;
}

.status-cardsort {
    background: #f0f8ee;
}

.status-interview {
    background: #f4efff;
}

.status-done {
    background: #eeeeee;
}

.collapsible {
    padding: 0;
    overflow: hidden;
}

.collapsible summary {
    cursor: pointer;
    padding: 18px;
    list-style: none;
    user-select: none;
}

.collapsible summary::-webkit-details-marker {
    display: none;
}

.collapsible summary::before {
    content: "▸";
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.15s ease;
}

.collapsible[open] summary::before {
    transform: rotate(90deg);
}

.collapsible-content {
    padding: 0 18px 18px 18px;
}
:root {
    --color-bg: #f6f7f9;
    --color-surface: #ffffff;
    --color-text: #111827;
    --color-primary: #111827;
    --color-primary-hover: #1f2937;
    --color-primary-soft: #eef0f4;
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.06);
    --radius-sm: 8px;
    --radius-md: 12px;
}

body {
    background: var(--color-bg);
    color: var(--color-text);
}

.page-shell {
    max-width: 960px;
    margin: 0 auto;
}

.page-shell-wide {
    max-width: 1440px;
    margin: 0 auto;
}

.page-header {
    margin-bottom: 20px;
}

.page-header h1 {
    margin-bottom: 6px;
}

.page-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
}

.page-grid-two {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.45fr);
    gap: 24px;
    align-items: start;
}

.card {
    box-shadow: var(--shadow-card);
}

.card-compact {
    padding: 14px;
}

button,
.button-link {
    background: var(--color-primary);
    color: white;
}

button:hover,
.button-link:hover {
    background: var(--color-primary-hover);
}

button.secondary,
.button-link.secondary {
    background: var(--color-primary-soft);
    color: var(--color-text);
}

button.secondary:hover,
.button-link.secondary:hover {
    background: #e2e5ea;
}

input[type="file"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: white;
}

input[type="checkbox"],
input[type="radio"] {
    width: auto;
}

.helptext,
.help-text {
    color: var(--color-muted);
    font-size: 0.95rem;
}

.form-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 18px;
}

.participant-session-content {
    text-align: center;
}

.participant-session-image {
    max-width: min(100%, 760px);
    max-height: 65vh;
    object-fit: contain;
    border-radius: var(--radius-card);
    border: 1px solid var(--color-border);
    background: white;
}

.study-image-preview,
.card-image-preview {
    max-width: 100%;
    max-height: 420px;
    object-fit: contain;
    border-radius: var(--radius-card);
    border: 1px solid var(--color-border);
    background: white;
}

@media (max-width: 900px) {
    body {
        padding: 16px;
    }

    .page-grid-two {
        grid-template-columns: 1fr;
    }

    .participant-session-image {
        max-height: 55vh;
    }
}
.public-page {
    max-width: 980px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.hero-card,
.study-card,
.empty-state,
.public-form {
    background: #fff;
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.06);
    border: 1px solid rgba(0,0,0,0.06);
}

.hero-card {
    margin-bottom: 1.5rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.75rem;
    font-weight: 700;
    opacity: 0.65;
    margin-bottom: 0.5rem;
}

.study-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

.study-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.study-card h2 {
    margin: 0;
}

.button-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    background: #111827;
    color: white;
    text-decoration: none;
    border: none;
    font-weight: 700;
    cursor: pointer;
}

.button-primary:hover {
    background: #374151;
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    color: inherit;
    text-decoration: none;
    opacity: 0.75;
}

.back-link:hover {
    opacity: 1;
}

.public-form {
    display: grid;
    gap: 1rem;
}

.public-form label {
    display: grid;
    gap: 0.4rem;
    font-weight: 700;
}

.public-form input[type="text"],
.public-form input[type="email"] {
    padding: 0.75rem 0.9rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(0,0,0,0.16);
    font: inherit;
}

.checkbox-row {
    display: flex !important;
    align-items: center;
    gap: 0.6rem !important;
    font-weight: 500 !important;
}

.checkbox-row input {
    width: 1.1rem;
    height: 1.1rem;
}
.landing-hero {
    max-width: 760px;
    margin: 4rem auto;
}

.landing-hero h1 {
    margin-bottom: 1rem;
}

.landing-hero p {
    line-height: 1.6;
}

.landing-actions {
    margin-top: 1.5rem;
}