/* Marketing landing + room dashboard/creation/invite/join/settings pages.
   Reuses --color-* tokens from app.css and the same blue/sky gradient
   family as the chat header, for a consistent brand across the app. */

:root {
    --duo-grad: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
    --duo-grad-soft: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 50%, #eef2ff 100%);
}

/* ---- Shared page shell ---- */

.duo-page {
    min-height: 100%;
    background: var(--duo-grad-soft);
}

.duo-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    max-width: 1080px;
    margin: 0 auto;
}

.duo-nav-brand {
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: -0.02em;
    background: var(--duo-grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
}

.duo-nav-links {
    display: flex;
    gap: 10px;
}

/* ---- Landing hero ---- */

.duo-hero {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px 32px;
    text-align: center;
}

.duo-hero h1 {
    font-size: clamp(2rem, 6vw, 3rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin: 0 0 14px;
}

.duo-hero p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin: 0 0 28px;
}

.duo-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.btn-lg {
    padding: 14px 26px;
    font-size: 1.02rem;
    border-radius: 14px;
}

.btn-gradient {
    background: var(--duo-grad);
    border: none;
    color: #fff;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.28);
}

.btn-gradient:hover { filter: brightness(1.05); }

/* ---- "Why DUO" / feature sections ---- */

.duo-section {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 24px;
}

.duo-section h2 {
    text-align: center;
    font-size: 1.6rem;
    margin: 0 0 24px;
    letter-spacing: -0.01em;
}

.duo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.duo-card {
    background: var(--color-surface);
    border-radius: 18px;
    padding: 22px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 20px rgba(37, 99, 235, 0.08);
}

.duo-card h3 {
    margin: 0 0 6px;
    font-size: 1.05rem;
}

.duo-card p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

.duo-steps {
    counter-reset: duo-step;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.duo-step {
    text-align: center;
}

.duo-step::before {
    counter-increment: duo-step;
    content: counter(duo-step);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin: 0 auto 10px;
    border-radius: 50%;
    background: var(--duo-grad);
    color: #fff;
    font-weight: 700;
}

.duo-cta {
    text-align: center;
    padding: 40px 24px 64px;
}

/* ---- Landing quiz teaser ---- */

.duo-quiz-intro {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 520px;
    margin: -8px auto 24px;
}

.quiz-card {
    max-width: 480px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(37, 99, 235, 0.08);
    text-align: center;
}

.quiz-start p {
    color: var(--color-text-muted);
    margin: 0 0 18px;
}

.quiz-progress {
    height: 6px;
    border-radius: 999px;
    background: #eef2ff;
    overflow: hidden;
    margin-bottom: 14px;
}

.quiz-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--duo-grad);
    border-radius: 999px;
    transition: width 0.25s ease;
}

.quiz-question-count {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 8px;
}

.quiz-question {
    font-size: 1.15rem;
    margin: 0 0 18px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.quiz-option {
    display: block;
    width: 100%;
    text-align: left;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-surface);
    font-size: 0.92rem;
    color: inherit;
    cursor: pointer;
    transition: border-color 0.12s ease, background 0.12s ease;
}

.quiz-option:hover {
    border-color: var(--color-primary);
    background: #eff6ff;
}

.quiz-result-emoji {
    font-size: 2.6rem;
    margin-bottom: 6px;
}

.quiz-result p {
    color: var(--color-text-muted);
    margin: 8px 0 22px;
}

.quiz-result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.quiz-play[hidden],
.quiz-result[hidden],
.quiz-start[hidden] { display: none; }

/* ---- Rooms dashboard ---- */

.duo-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px;
}

.duo-page-title {
    font-size: 1.5rem;
    margin: 8px 0 20px;
    letter-spacing: -0.02em;
}

.room-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.room-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--color-surface);
    border-radius: 18px;
    padding: 16px;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 6px 16px rgba(37, 99, 235, 0.07);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.room-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08), 0 12px 24px rgba(37, 99, 235, 0.12);
}

.room-card-avatar {
    width: 48px;
    height: 48px;
    flex: none;
    border-radius: 50%;
    background: var(--duo-grad);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    text-transform: uppercase;
}

.room-card-body { min-width: 0; flex: 1; }

.room-card-name {
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
}

.room-card-tag {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-primary);
    background: #eff6ff;
    padding: 2px 8px;
    border-radius: 999px;
}


.duo-empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--color-text-muted);
}

.duo-empty-state .btn { margin-top: 16px; }

/* ---- Create room / settings forms ---- */

.duo-form-card {
    background: var(--color-surface);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(37, 99, 235, 0.08);
}

.room-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 8px;
}

.room-type-option {
    position: relative;
}

.room-type-option input {
    position: absolute;
    opacity: 0;
}

.room-type-option label {
    display: block;
    text-align: center;
    padding: 10px 6px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.85rem;
}

.room-type-option input:checked + label {
    border-color: var(--color-primary);
    background: #eff6ff;
    color: var(--color-primary);
    font-weight: 600;
}

/* ---- Invite / join screens ---- */

.invite-link-box {
    display: flex;
    gap: 8px;
    align-items: center;
    background: #f4f9ff;
    border: 1px solid var(--chat-border, #dbeafe);
    border-radius: 12px;
    padding: 10px 12px;
    margin: 14px 0;
}

.invite-link-box code {
    flex: 1;
    overflow-x: auto;
    white-space: nowrap;
    font-size: 0.85rem;
}

.invite-code-display {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    margin: 10px 0;
    color: var(--color-primary);
}

.duo-waiting-pulse {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.duo-waiting-pulse::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: chatPulse 1.6s infinite;
}

.join-preview-peer {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: center;
    margin: 18px 0;
}

.join-preview-peer .avatar {
    width: 56px;
    height: 56px;
    background: var(--duo-grad);
    color: #fff;
    border: none;
    font-size: 1.3rem;
}

@media (max-width: 640px) {
    .duo-nav { flex-wrap: wrap; gap: 10px; }
}