/* ═══════════════════════════════════════════════════════════════
   Swinburne Babylab — Registration Survey Styles
   Warm, friendly, mobile-first design for parents.
   ═══════════════════════════════════════════════════════════════ */

:root {
    --purple: #3b2e7e;
    --purple-light: #5a4ba6;
    --purple-pale: #ede9f6;
    --teal: #0d9488;
    --teal-light: #ccfbf1;
    --teal-dark: #0f766e;
    --gold: #f5c842;
    --gold-light: #fef3c7;
    --mint: #c4f0e4;
    --pink-light: #fce4ec;
    --bg: linear-gradient(135deg, #e8f5e9 0%, #e3f2fd 50%, #f3e5f5 100%);
    --surface: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --danger: #ef4444;
    --radius: 12px;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font);
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    line-height: 1.6;
}

/* ─── Container ─── */

.survey-container {
    max-width: 640px;
    margin: 2rem auto;
    padding: 0 1rem 2rem;
}

/* ─── Progress Bar ─── */

.progress-bar {
    height: 6px;
    background: var(--purple-pale);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--teal), var(--purple-light));
    border-radius: 3px;
    transition: width 0.4s ease;
    width: 0%;
}

.progress-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
    margin-bottom: 1.5rem;
}

/* ─── Step Card ─── */

.step-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.step-card h2 {
    font-size: 1.5rem;
    color: var(--purple);
    margin-bottom: 0.5rem;
}

.step-card .step-subtitle {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* ─── Welcome Step ─── */

.welcome-banner {
    width: 100%;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

.welcome-text {
    font-size: 1.05rem;
    line-height: 1.7;
}

.welcome-text p {
    margin-bottom: 1rem;
}

.welcome-text a {
    color: var(--teal-dark);
}

/* ─── Form Fields ─── */

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.35rem;
    color: var(--text);
}

.form-group .label-hint {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="date"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1.5px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font);
    color: var(--text);
    background: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

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

.form-group .field-error {
    color: var(--danger);
    font-size: 0.82rem;
    margin-top: 0.25rem;
    display: none;
}

.form-group.has-error input,
.form-group.has-error select {
    border-color: var(--danger);
}

.form-group.has-error .field-error {
    display: block;
}

/* ─── Radio / Checkbox Cards ─── */

.option-cards {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-card {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.option-card:hover {
    border-color: var(--teal);
    background: var(--teal-light);
}

.option-card.selected {
    border-color: var(--teal);
    background: var(--teal-light);
}

.option-card input[type="radio"],
.option-card input[type="checkbox"] {
    margin-top: 0.2rem;
    accent-color: var(--teal);
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.option-card .option-label {
    font-weight: 600;
    font-size: 1rem;
}

.option-card .option-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

/* Horizontal options (e.g. Yes/No) */
.option-cards.horizontal {
    flex-direction: row;
}

.option-cards.horizontal .option-card {
    flex: 1;
    text-align: center;
    justify-content: center;
}

/* ─── Number Selector (children count) ─── */

.number-selector {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.number-btn {
    width: 52px;
    height: 52px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    background: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--purple);
    cursor: pointer;
    transition: all 0.2s;
}

.number-btn:hover {
    border-color: var(--teal);
    background: var(--teal-light);
}

.number-btn.selected {
    border-color: var(--teal);
    background: var(--teal);
    color: #fff;
}

/* ─── Child Name Inputs (dynamic list) ─── */

.child-name-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.child-name-row .child-number {
    width: 28px;
    height: 28px;
    background: var(--purple);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.child-name-row input {
    flex: 1;
    font-size: 1.1rem;
    padding: 0.7rem 0.85rem;
}

/* ─── Same Surname Toggle ─── */

.surname-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.surname-toggle input[type="checkbox"] {
    accent-color: var(--teal);
    width: 18px;
    height: 18px;
}

/* ─── DOB Selects ─── */

.dob-selects {
    display: flex;
    gap: 0.5rem;
}

.dob-selects select {
    flex: 1;
    padding: 0.65rem 0.85rem;
    border: 1.5px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font);
    color: var(--text);
    background: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.dob-selects select:focus {
    outline: none;
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

/* ─── Conditional Field (show/hide) ─── */

.conditional-field {
    display: none;
    margin-top: 0.75rem;
    padding-left: 1rem;
    border-left: 3px solid var(--teal-light);
}

.conditional-field.visible {
    display: block;
}

/* ─── Child Section Header ─── */

.child-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--purple-pale);
}

.child-header .child-avatar {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--mint), var(--teal-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.child-header h2 {
    margin: 0;
}

/* ─── Study Type Cards ─── */

.study-cards {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.study-card {
    padding: 1.25rem;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.study-card:hover {
    border-color: var(--teal);
}

.study-card.selected {
    border-color: var(--teal);
    background: var(--teal-light);
}

.study-card input[type="radio"] {
    display: none;
}

.study-card .study-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--purple);
    margin-bottom: 0.25rem;
}

.study-card .study-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* ─── Navigation Buttons ─── */

.nav-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font);
}

.btn-next {
    background: var(--teal);
    color: #fff;
    margin-left: auto;
}

.btn-next:hover {
    background: var(--teal-dark);
}

.btn-next:disabled {
    background: #d1d5db;
    cursor: not-allowed;
}

.btn-back {
    background: transparent;
    color: var(--text-muted);
    border: 1.5px solid #d1d5db;
}

.btn-back:hover {
    background: #f3f4f6;
}

.btn-submit {
    background: var(--purple);
    color: #fff;
    margin-left: auto;
}

.btn-submit:hover {
    background: var(--purple-light);
}

.btn-submit:disabled {
    background: #d1d5db;
    cursor: not-allowed;
}

/* ─── Thank You ─── */

.thank-you {
    text-align: center;
    padding: 2rem 0;
}

.thank-you .check-circle {
    width: 80px;
    height: 80px;
    background: var(--teal-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2.5rem;
    color: var(--teal);
}

.thank-you h2 {
    color: var(--purple);
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.thank-you p {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

/* ─── Submission Error ─── */

.submit-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 1rem;
    color: var(--danger);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: none;
}

.submit-error.visible {
    display: block;
}

/* ─── Duplicate Warning ─── */

.dup-warning {
    background: var(--gold-light);
    border: 1px solid var(--gold);
    border-radius: 8px;
    padding: 1rem;
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* ─── Responsive ─── */

@media (max-width: 480px) {
    .survey-container {
        margin: 1rem auto;
        padding: 0 0.75rem 1.5rem;
    }

    .step-card {
        padding: 1.25rem;
    }

    .step-card h2 {
        font-size: 1.25rem;
    }

    .btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.95rem;
    }

    .option-cards.horizontal {
        flex-direction: column;
    }

    .number-btn {
        width: 46px;
        height: 46px;
        font-size: 1.1rem;
    }
}

/* ─── Loading spinner ─── */

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ─── Privacy link ─── */

.privacy-note {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 1.5rem;
    text-align: center;
}

.privacy-note a {
    color: var(--teal-dark);
}