:root {
    --color-bg: #f4f6f8;
    --color-surface: #ffffff;
    --color-text: #16232c;
    --color-text-muted: #4a5a66;
    --color-primary: #0b3d63;
    --color-primary-dark: #082b46;
    --color-border: #d7dee3;
    --color-success: #1a7f4e;
    --color-success-bg: #e8f6ee;
    --color-danger: #b3261e;
    --color-danger-bg: #fbe9e7;
    --color-warning: #8a5a00;
    --color-warning-bg: #fff4e0;
    --radius: 12px;
    --max-width: 480px;
    color-scheme: light;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    min-width: 320px;
}

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    overflow-x: hidden;
}

a, button {
    font: inherit;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-header {
    background: var(--color-primary);
    color: #fff;
    padding: 0.9rem 1rem;
}

.site-header__brand {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.site-header__crest {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    font-weight: 700;
    letter-spacing: 0.03em;
    flex-shrink: 0;
}

.site-header__title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
}

.site-header__subtitle {
    margin: 0;
    font-size: 0.8rem;
    opacity: 0.85;
}

.app {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.25rem 1rem 2rem;
}

.site-footer {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    padding: 1.5rem 1rem 2.5rem;
}

.screen {
    display: block;
}

.screen[hidden] {
    display: none;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.75rem 1.25rem;
    box-shadow: 0 1px 3px rgba(16, 24, 32, 0.06);
}

.card--centered {
    text-align: center;
}

.card--danger {
    border-color: #f0b7b1;
    background: var(--color-danger-bg);
}

.card--warning {
    border-color: #f0d9a6;
    background: var(--color-warning-bg);
}

.card__title {
    font-size: 1.4rem;
    margin: 0.25rem 0 0.75rem;
}

.card__text {
    color: var(--color-text-muted);
    margin: 0 0 1.25rem;
}

.privacy-note {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin: 1rem 0 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 44px;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    border: 2px solid transparent;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn:focus-visible {
    outline: 3px solid #6fb1e0;
    outline-offset: 2px;
}

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

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

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

.btn--secondary:hover {
    background: var(--color-bg);
}

.btn--large {
    width: 100%;
    padding: 0.9rem 1.5rem;
    font-size: 1.05rem;
}

.scanner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.scanner__viewport {
    position: relative;
    width: 100%;
    max-width: 420px;
    aspect-ratio: 1 / 1;
    background: #0d1117;
    border-radius: var(--radius);
    overflow: hidden;
}

.scanner__video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.scanner__frame {
    position: absolute;
    inset: 12%;
    border: 3px solid rgba(255, 255, 255, 0.85);
    border-radius: 16px;
    pointer-events: none;
}

.scanner__status {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    min-height: 1.4em;
    text-align: center;
}

.scanner__debug {
    width: 100%;
    max-width: 420px;
    max-height: 220px;
    overflow: auto;
    margin: 0;
    padding: 0.6rem;
    font-size: 0.72rem;
    line-height: 1.4;
    text-align: left;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    white-space: pre-wrap;
    word-break: break-word;
}

.result-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    background: var(--color-success-bg);
    color: var(--color-success);
}

.result-icon--danger {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.result-icon--warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.result-status {
    display: inline-block;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.75rem;
    border-radius: 999px;
    background: var(--color-success-bg);
    color: var(--color-success);
    margin: 0 0 1rem;
}

.result-status[data-status="EXPIRED"],
.result-status[data-status="REVOKED"] {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.result-status[data-status="NOT_FOUND"] {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.result-details {
    text-align: left;
    margin: 0 0 1.25rem;
    border-top: 1px solid var(--color-border);
    padding-top: 0.75rem;
}

.result-details dt {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-top: 0.6rem;
}

.result-details dd {
    margin: 0.1rem 0 0;
    font-size: 0.98rem;
}

.result-source {
    text-align: left;
    margin: 0 0 1.25rem;
}

.result-source__label {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin: 0 0 0.4rem;
}

.result-source__frame {
    display: block;
    width: 100%;
    height: 50vh;
    max-height: 480px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
}

.mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    word-break: break-all;
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --color-bg: #0f1418;
        --color-surface: #171e24;
        --color-text: #e8edf1;
        --color-text-muted: #a6b3bc;
        --color-primary: #3a8fd1;
        --color-primary-dark: #2c72a8;
        --color-border: #2a333a;
        --color-success: #4fce93;
        --color-success-bg: #103322;
        --color-danger: #ff8a80;
        --color-danger-bg: #3a1614;
        --color-warning: #f2c265;
        --color-warning-bg: #382a08;
    }

    .btn--primary {
        color: #06131c;
    }
}