/* ═══════════════════════════════════════════════════════════════
   Voice Study — Stylesheet
   Premium design: Inter font, dark voice UI, light forms,
   smooth transitions, glassmorphism accents.
   ═══════════════════════════════════════════════════════════════ */

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --c-bg: #f5f6fa;
    --c-surface: #ffffff;
    --c-text: #1a1a2e;
    --c-text-muted: #6b7280;
    --c-primary: #4f6ef7;
    --c-primary-hover: #3b5de7;
    --c-danger: #ef4444;
    --c-danger-hover: #dc2626;
    --c-success: #10b981;
    --c-warning: #f59e0b;
    --c-border: #e5e7eb;
    --c-version-a: #4a7ddd;
    --c-version-a-bg: rgba(99, 149, 255, 0.10);
    --c-version-b: #d97a4a;
    --c-version-b-bg: rgba(255, 149, 99, 0.10);
    --c-voice-bg: #0f0f1a;
    --c-voice-bg2: #1a1a2e;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 24px rgba(0,0,0,0.10);
    --transition: 0.2s ease;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--c-text);
    background: var(--c-bg);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Views ──────────────────────────────────────────────────── */
.view {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    animation: fadeIn 0.3s ease;
}
.view-dark {
    background: linear-gradient(145deg, var(--c-voice-bg) 0%, var(--c-voice-bg2) 100%);
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Cards ──────────────────────────────────────────────────── */
.card {
    background: var(--c-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.5rem;
}
.center-card { margin: 0 auto; }
.card-narrow { max-width: 520px; width: 100%; }
.card-medium { max-width: 680px; width: 100%; }
.card-wide { max-width: 960px; width: 100%; }
.card-icon {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    text-align: center;
}
h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 1.5rem 0 0.5rem;
    color: var(--c-text);
}
.subtitle {
    color: var(--c-text-muted);
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--c-primary-hover); transform: translateY(-1px); }
.btn-secondary { background: var(--c-bg); color: var(--c-text); border: 1px solid var(--c-border); }
.btn-secondary:hover:not(:disabled) { background: #e9ebf0; }
.btn-danger { background: var(--c-danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--c-danger-hover); }
.btn-full { width: 100%; }
.btn-large { padding: 1rem 2rem; font-size: 1.05rem; }

/* ── Forms ──────────────────────────────────────────────────── */
.form-grid { display: flex; flex-direction: column; gap: 1rem; }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-field { display: flex; flex-direction: column; gap: 0.3rem; }
.form-field label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--c-text);
}
.form-inline { display: flex; gap: 0.5rem; }

select, input[type="number"], input[type="text"], textarea {
    font-family: var(--font);
    font-size: 0.9rem;
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    background: var(--c-surface);
    color: var(--c-text);
    transition: border-color var(--transition);
    width: 100%;
}
select:focus, input:focus, textarea:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.12);
}
.input-code {
    flex: 1;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}
textarea { resize: vertical; min-height: 70px; }

.divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--c-text-muted);
    font-size: 0.85rem;
}
.divider::before, .divider::after {
    content: '';
    flex: 1;
    border-top: 1px solid var(--c-border);
}

.error-msg {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.25);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    color: var(--c-danger);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}
.text-muted { color: var(--c-text-muted); font-size: 0.9rem; }
.text-warning {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* ── Code display ──────────────────────────────────────────── */
.code-display {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    padding: 1rem;
    background: var(--c-bg);
    border-radius: var(--radius-sm);
    letter-spacing: 0.1em;
    color: var(--c-primary);
    margin: 1rem 0;
}

/* ── Briefing ──────────────────────────────────────────────── */
.briefing-content {
    background: var(--c-bg);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    margin: 1.5rem 0;
    line-height: 1.7;
}
.briefing-content p { margin-bottom: 0.75rem; }
.briefing-content p:last-child { margin-bottom: 0; }
.briefing-hint {
    background: rgba(79, 110, 247, 0.06);
    border: 1px solid rgba(79, 110, 247, 0.15);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

/* ═══════════════════════════════════════════════════════════════
   Voice Call UI
   ═══════════════════════════════════════════════════════════════ */
.voice-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    width: 100%;
    max-width: 480px;
    color: #fff;
}
.voice-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
.voice-version-badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.95rem;
    background: rgba(99, 149, 255, 0.2);
    color: #8bb4ff;
    border: 1px solid rgba(99, 149, 255, 0.3);
}
.voice-version-badge.version-b {
    background: rgba(255, 149, 99, 0.2);
    color: #ffb088;
    border-color: rgba(255, 149, 99, 0.3);
}
.voice-scenario-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

/* Orb animation */
.voice-orb-container {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.voice-orb {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.voice-orb-inner {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4f6ef7 0%, #7c5cfc 100%);
    box-shadow: 0 0 40px rgba(79, 110, 247, 0.4);
    transition: all 0.5s ease;
}
.voice-orb-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid rgba(79, 110, 247, 0.3);
    animation: orbPulse 2.5s ease-in-out infinite;
}
.voice-orb-ring-2 { animation-delay: 1.25s; }

@keyframes orbPulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.4); opacity: 0; }
}

/* Active speaking state */
.voice-orb.speaking .voice-orb-inner {
    box-shadow: 0 0 60px rgba(79, 110, 247, 0.6), 0 0 120px rgba(79, 110, 247, 0.2);
    transform: scale(1.1);
}
.voice-orb.speaking .voice-orb-ring {
    animation-duration: 1.2s;
}

/* Connecting state */
.voice-orb.connecting .voice-orb-inner {
    opacity: 0.5;
    animation: orbBreathe 1.5s ease-in-out infinite;
}
@keyframes orbBreathe {
    0%, 100% { transform: scale(0.95); }
    50% { transform: scale(1.05); }
}

.voice-status {
    font-size: 1rem;
    font-weight: 500;
    color: rgba(255,255,255,0.7);
    text-align: center;
}
.voice-timer {
    font-size: 2rem;
    font-weight: 300;
    color: rgba(255,255,255,0.4);
    font-variant-numeric: tabular-nums;
}
.voice-exchange-hint {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.btn-round {
    padding: 1rem 2rem;
    border-radius: 999px;
    font-size: 1rem;
    margin-top: 1rem;
}
.btn-icon { font-size: 1.2rem; }

/* ═══════════════════════════════════════════════════════════════
   Questionnaire
   ═══════════════════════════════════════════════════════════════ */

/* Version header row */
.q-version-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}
.q-vh {
    flex: 1;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    text-align: center;
}
.q-vh-a { background: var(--c-version-a-bg); color: var(--c-version-a); }
.q-vh-b { background: var(--c-version-b-bg); color: var(--c-version-b); }

/* Scale separator */
.q-separator {
    border: none;
    border-top: 2px solid var(--c-border);
    margin: 1.5rem 0 1rem;
}

/* Question row */
.q-item { margin-bottom: 1rem; }
.q-item-label {
    font-weight: 500;
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
}
.q-item-scale-hint {
    font-size: 0.8rem;
    color: var(--c-text-muted);
    font-style: italic;
    margin-bottom: 0.5rem;
}

/* Likert row (two columns) */
.q-likert-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.q-likert-group {
    display: flex;
    gap: 0;
}
.q-likert-group label {
    flex: 1;
    text-align: center;
    padding: 0.4rem 0;
    border: 1px solid var(--c-border);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    background: var(--c-surface);
}
.q-likert-group label:first-child { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.q-likert-group label:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.q-likert-group label:not(:first-child) { border-left: none; }
.q-likert-group input[type="radio"] { display: none; }
.q-likert-group input[type="radio"]:checked + span {
    /* handled via JS class toggle on parent label */
}
.q-likert-group label.selected {
    background: var(--c-primary);
    color: #fff;
    border-color: var(--c-primary);
}
.q-likert-group label.selected + label { border-left-color: var(--c-primary); }
.q-likert-group label:hover:not(.selected) { background: var(--c-bg); }

/* Two-column text areas */
.q-text-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 0.5rem;
}

/* Select row */
.q-select-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Preference (horizontal radios) */
.q-pref-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.q-pref-group label {
    padding: 0.5rem 1rem;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
}
.q-pref-group input[type="radio"] { display: none; }
.q-pref-group label.selected {
    background: var(--c-primary);
    color: #fff;
    border-color: var(--c-primary);
}
.q-pref-group label:hover:not(.selected) { background: var(--c-bg); }

/* Question divider */
.q-divider {
    border: none;
    border-top: 1px solid rgba(0,0,0,0.06);
    margin: 0.75rem 0;
}

/* ═══════════════════════════════════════════════════════════════
   Admin
   ═══════════════════════════════════════════════════════════════ */
.admin-actions { display: flex; flex-direction: column; gap: 0.75rem; margin: 1rem 0; }

/* ═══════════════════════════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
    .card { padding: 1.5rem; }
    .form-row-2 { grid-template-columns: 1fr; }
    .q-likert-row { grid-template-columns: 1fr; }
    .q-text-row { grid-template-columns: 1fr; }
    .q-select-row { grid-template-columns: 1fr; }
    .q-version-header { flex-direction: column; gap: 0.25rem; }
    h1 { font-size: 1.3rem; }
}