/* ═══════════════════════════════════════════════════════════════════════════
   book.css — Standalone /book page styles
   Shares all CSS variables from style.css (:root is inherited).
   ═══════════════════════════════════════════════════════════════════════════ */


/* ─── Book Page Layout ───────────────────────────────────────────────────── */

#book-page {
    max-width: 640px;
    margin: 0 auto;
    padding: 3rem 2rem 6rem;
}

#book-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

#book-header h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 300;
    margin-bottom: 0.75rem;
    color: var(--text);
}

#book-header p {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

#chat-instead-link {
    font-size: 0.85rem;
    color: var(--glow-mid);
    text-decoration: none;
    transition: color 0.2s;
}
#chat-instead-link:hover { color: var(--glow-light); }


/* ─── Form Layout ────────────────────────────────────────────────────────── */

#book-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.required { color: var(--glow-mid); }
.optional  { color: var(--text-dim); font-weight: 400; }


/* ─── Form Inputs ────────────────────────────────────────────────────────── */

.form-group input,
.form-group textarea {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--text);
    font-family: var(--font);
    font-size: 0.9375rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-dim);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: rgba(56, 168, 224, 0.5);
    box-shadow: 0 0 0 3px rgba(56, 168, 224, 0.08);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.55;
}


/* ─── Day → Time Picker ──────────────────────────────────────────────────── */

#slot-picker {
    margin-top: 0.25rem;
}

.slot-loading {
    color: var(--text-dim);
    font-size: 0.875rem;
    font-style: italic;
}

.slot-empty {
    color: var(--text-dim);
    font-size: 0.875rem;
    font-style: italic;
}

/* Scrollable row of day cards */
.day-row {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    scrollbar-width: none;
}
.day-row::-webkit-scrollbar { display: none; }

.day-btn {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.6rem 0.875rem;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    font-family: var(--font);
    min-width: 64px;
}

.day-btn:hover {
    border-color: rgba(56, 168, 224, 0.4);
}

.day-btn.selected {
    background: rgba(30, 111, 168, 0.2);
    border-color: var(--glow-mid);
}

.day-name {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.day-date {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
}

.day-btn.selected .day-name,
.day-btn.selected .day-date {
    color: var(--glow-light);
}

/* Time grid — hidden until a day is selected */
.time-grid {
    display: none;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.time-grid.visible {
    display: flex;
}

.time-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.75rem;
    color: var(--text-muted);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    font-family: var(--font);
}

.time-btn:hover {
    border-color: rgba(56, 168, 224, 0.4);
    color: var(--text);
}

.time-btn.selected {
    background: rgba(30, 111, 168, 0.2);
    border-color: var(--glow-mid);
    color: var(--glow-light);
}


/* ─── Submit Button ──────────────────────────────────────────────────────── */

#book-submit {
    margin-top: 0.5rem;
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
}

#book-submit:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}


/* ─── Error + Confirmation ───────────────────────────────────────────────── */

.form-error {
    color: #f87171;
    font-size: 0.875rem;
    text-align: center;
}

#book-confirm {
    text-align: center;
    padding: 3rem 1rem;
}

#book-confirm h2 {
    font-weight: 300;
    margin-bottom: 0.75rem;
    color: var(--glow-light);
}

#book-confirm p {
    color: var(--text-muted);
}


/* ─── Responsive ─────────────────────────────────────────────────────────── */

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}