:root {
    --bk-bg: #fafafa;
    --bk-surface: #ffffff;
    --bk-text: #111111;
    --bk-muted: #6b7280;
    --bk-border: #e5e7eb;
    --bk-accent: #0a0a0a;
    --bk-accent-soft: #f3f4f6;
    --bk-radius: 12px;
    --bk-safe-b: env(safe-area-inset-bottom, 0px);
    --bk-safe-t: env(safe-area-inset-top, 0px);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100dvh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.45;
    color: var(--bk-text);
    background: var(--bk-bg);
    -webkit-font-smoothing: antialiased;
}

.bk-shell {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    padding: calc(12px + var(--bk-safe-t)) 16px calc(88px + var(--bk-safe-b));
}

.bk-header {
    padding: 8px 0 20px;
}

.bk-header h1 {
    margin: 0 0 4px;
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.bk-header p {
    margin: 0;
    color: var(--bk-muted);
    font-size: 0.9rem;
}

.bk-step-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--bk-muted);
    margin: 0 0 10px;
}

.bk-tz {
    margin: 0 0 16px;
}
.bk-tz-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--bk-muted);
    margin: 0 0 6px;
}
.bk-tz-select {
    width: 100%;
    max-width: 420px;
    padding: 10px 12px;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    background: var(--bk-surface);
    font: inherit;
    color: var(--bk-text);
}
.bk-tz-hint {
    margin: 6px 0 0;
    font-size: 0.8rem;
    color: var(--bk-muted);
}

.bk-date-strip {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    margin: 0 -4px 16px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.bk-date-strip::-webkit-scrollbar { display: none; }

.bk-date-pill {
    flex: 0 0 auto;
    scroll-snap-align: start;
    min-width: 72px;
    padding: 10px 12px;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    background: var(--bk-surface);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.bk-date-pill .dow {
    display: block;
    font-size: 0.7rem;
    color: var(--bk-muted);
    text-transform: uppercase;
}
.bk-date-pill .dom {
    display: block;
    font-size: 1rem;
    font-weight: 600;
}
.bk-date-pill.is-active {
    border-color: var(--bk-accent);
    background: var(--bk-accent);
    color: #fff;
}
.bk-date-pill.is-active .dow { color: rgba(255,255,255,0.75); }
.bk-date-pill.is-unavailable {
    opacity: 0.55;
    background: #f3f4f6;
    border-style: dashed;
}
.bk-date-pill.is-unavailable.is-active {
    opacity: 1;
    background: #e5e7eb;
    border-color: #9ca3af;
    border-style: solid;
    color: var(--bk-text);
}
.bk-date-pill.is-unavailable.is-active .dow { color: var(--bk-muted); }
.bk-date-pill-tag {
    display: block;
    margin-top: 2px;
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #b45309;
}
.bk-date-pill.is-active .bk-date-pill-tag { color: #fbbf24; }
.bk-date-pill.is-unavailable.is-active .bk-date-pill-tag { color: #b45309; }

.bk-day-hint {
    margin: -4px 0 14px;
    padding: 12px 14px;
    border-radius: var(--bk-radius);
    background: #fffbeb;
    border: 1px solid #fde68a;
}
.bk-day-hint-text,
.bk-day-hint-note,
.bk-day-hint-sub {
    margin: 0;
    font-size: 0.9rem;
    color: #92400e;
}
.bk-day-hint-sub { margin-top: 6px; opacity: 0.9; }
.bk-day-hint-note { color: #78350f; }
.bk-day-hint-btn {
    display: inline-flex;
    align-items: center;
    margin-top: 10px;
    min-height: 40px;
    padding: 0 14px;
    border: none;
    border-radius: 999px;
    background: var(--bk-accent);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
}

.bk-mode-strip {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}
.bk-mode-pill {
    flex: 1;
    min-height: 44px;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    background: var(--bk-surface);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}
.bk-mode-pill.is-active {
    border-color: var(--bk-accent);
    background: var(--bk-accent);
    color: #fff;
}

.bk-slots {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.bk-slot {
    min-height: 48px;
    padding: 12px 10px;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    background: var(--bk-surface);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.15s;
}
.bk-slot:hover { border-color: #9ca3af; }
.bk-slot.is-selected {
    border-color: var(--bk-accent);
    background: var(--bk-accent);
    color: #fff;
}
.bk-slot:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.bk-empty, .bk-loading {
    text-align: center;
    color: var(--bk-muted);
    padding: 32px 16px;
    font-size: 0.95rem;
}

.bk-summary {
    background: var(--bk-surface);
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    padding: 16px;
    margin-top: 8px;
}
.bk-summary dt {
    font-size: 0.75rem;
    color: var(--bk-muted);
    margin: 0 0 2px;
}
.bk-summary dd {
    margin: 0 0 12px;
    font-weight: 600;
}
.bk-summary dd:last-child { margin-bottom: 0; }

.bk-contact {
    margin-top: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.bk-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.bk-field span {
    font-size: 0.75rem;
    color: var(--bk-muted);
    font-weight: 600;
}
.bk-field span em {
    font-weight: 400;
    font-style: normal;
    opacity: 0.7;
}
.bk-field input {
    width: 100%;
    min-height: 46px;
    padding: 10px 14px;
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    background: var(--bk-surface);
    color: var(--bk-text);
    font-size: 1rem;
}
.bk-field input:focus {
    outline: none;
    border-color: var(--bk-accent);
}
.bk-field.bk-check {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}
.bk-field.bk-check input[type="checkbox"] {
    width: auto;
    min-height: auto;
}

.bk-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 12px 16px calc(12px + var(--bk-safe-b));
    background: rgba(250, 250, 250, 0.92);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--bk-border);
}

.bk-btn {
    display: block;
    width: 100%;
    min-height: 48px;
    border: none;
    border-radius: var(--bk-radius);
    background: var(--bk-accent);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}
.bk-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}
.bk-btn.is-secondary {
    background: var(--bk-surface);
    color: var(--bk-text);
    border: 1px solid var(--bk-border);
}

.bk-success {
    text-align: center;
    padding: 40px 16px;
}
.bk-success-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: #ecfdf5;
    color: #059669;
    font-size: 1.75rem;
    line-height: 56px;
}
.bk-success h2 {
    margin: 0 0 8px;
    font-size: 1.25rem;
}
.bk-success p { color: var(--bk-muted); margin: 0 0 4px; }
.bk-success-time { font-size: 1.05rem; font-weight: 600; color: var(--bk-text) !important; }
.bk-success-extra { margin-top: 14px !important; font-size: 0.85rem; }

.bk-wa-card {
    border: 1px solid var(--bk-border);
    border-radius: var(--bk-radius);
    background: var(--bk-surface);
    padding: 16px;
    margin: 4px 0 16px;
}
.bk-wa-card-head {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
    text-align: left;
}
.bk-wa-badge {
    flex: 0 0 auto;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #e7f9ee;
    color: #128c46;
}
.bk-wa-card-copy { display: flex; flex-direction: column; gap: 2px; }
.bk-wa-card-copy strong { font-size: 0.95rem; }
.bk-wa-card-copy .bk-muted { font-size: 0.82rem; }
.bk-btn-wa {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #25d366;
    color: #fff;
    text-decoration: none;
}

.bk-manage { text-align: center; margin-top: 4px; }
.bk-manage-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--bk-muted);
    margin: 0 0 10px;
}
.bk-manage-actions { display: flex; gap: 10px; }
.bk-manage-actions .bk-btn { flex: 1; }
.bk-btn-danger { color: #b91c1c; border-color: #fecaca; }

.bk-error-banner {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
    border-radius: var(--bk-radius);
    padding: 12px;
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.bk-hidden { display: none !important; }

@media (min-width: 600px) {
    .bk-slots { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
    body {
        display: flex;
        align-items: flex-start;
        justify-content: center;
        padding: 40px 16px;
    }
    .bk-shell {
        width: 100%;
        max-width: 520px;
        min-height: auto;
        background: var(--bk-surface);
        border: 1px solid var(--bk-border);
        border-radius: 16px;
        box-shadow: 0 8px 30px rgba(0,0,0,0.06);
        padding: 24px 24px calc(88px + var(--bk-safe-b));
    }
    .bk-bar {
        max-width: 520px;
        left: 50%;
        transform: translateX(-50%);
        border-radius: 0 0 16px 16px;
    }
    .bk-slots { grid-template-columns: repeat(4, 1fr); }
}