@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    --transition-fast: all 0.25s ease;

    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;

    --bg-primary: #F9F9F9;
    --bg-secondary: #FFFFFF;
    --text-primary: #111111;
    --text-secondary: #666666;
    --accent: #D32F2F;
    --accent-hover: #B71C1C;
    --border: #E5E5E5;
    --card-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0A0A0C;
        --bg-secondary: #121216;
        --text-primary: #F3F3F5;
        --text-secondary: #9A9AA2;
        --border: #26262C;
        --card-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    }
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

.page {
    max-width: 900px;
    margin: 0 auto;
    padding: 64px 24px 80px;
}

.page__header {
    text-align: center;
    margin-bottom: 40px;
}

.page__brand {
    display: block;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.3em;
    color: var(--accent);
    margin-bottom: 16px;
}

.page__title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(28px, 4vw, 40px);
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.page__subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 480px;
    margin: 0 auto;
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow: hidden;
}

@media (max-width: 720px) {
    .card {
        grid-template-columns: 1fr;
    }
}

.card__form {
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    border-right: 1px solid var(--border);
}

@media (max-width: 720px) {
    .card__form {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tabs__btn {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.tabs__btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.tabs__btn.is-active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field label {
    font-size: 13px;
    color: var(--text-secondary);
}

.field input[type="text"] {
    font-family: var(--font-body);
    font-size: 15px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-fast);
}

.field input[type="text"]:focus {
    border-color: var(--accent);
}

.colors {
    display: flex;
    gap: 24px;
    margin-top: 8px;
}

.colors__item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.colors__item label {
    font-size: 13px;
    color: var(--text-secondary);
}

.colors__item input[type="color"] {
    width: 48px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: none;
    cursor: pointer;
}

.card__preview {
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.qr-canvas {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 220px;
    height: 220px;
}

.qr-canvas canvas,
.qr-canvas img,
.qr-canvas svg {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-sm);
}

.qr-label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 15px;
    text-align: center;
    word-break: break-all;
    max-width: 260px;
}

.downloads {
    display: flex;
    gap: 12px;
}

.btn {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn--primary {
    background: var(--accent);
    color: #fff;
}

.btn--primary:hover {
    background: var(--accent-hover);
}

.btn--ghost {
    background: transparent;
    border-color: var(--border);
    color: var(--text-primary);
}

.btn--ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.page__footer {
    text-align: center;
    margin-top: 32px;
    font-size: 13px;
    color: var(--text-secondary);
}

.page__footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.page__footer a:hover {
    text-decoration: underline;
}