:root {
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --primary-color: #0284c7;
    --primary-hover: #0369a1;
    --primary-light: #e0f2fe;
    --accent-color: #38bdf8;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border-bottom: 1px solid #334155;
    padding: 12px 24px;
    color: #ffffff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.header-logo {
    height: 44px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    color: #ffffff;
    display: block;
    line-height: 1.1;
}

.brand-sub {
    font-size: 0.85rem;
    color: var(--accent-color);
    font-weight: 700;
    margin-left: 2px;
}

.brand-desc {
    font-size: 0.75rem;
    color: #94a3b8;
    display: block;
}

/* Autosave Badge */
.autosave-status {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 6px 14px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: #cbd5e1;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #22c55e;
    border-radius: 50%;
    box-shadow: 0 0 8px #22c55e;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.9); }
    100% { opacity: 1; transform: scale(1); }
}

/* Progress Box */
.progress-box {
    width: 180px;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: #94a3b8;
    margin-bottom: 4px;
}

.progress-custom {
    height: 6px;
    background-color: #334155;
    border-radius: 3px;
    overflow: hidden;
}

.progress-custom .progress-bar {
    background: linear-gradient(90deg, #38bdf8, #0284c7);
    transition: width 0.4s ease;
}

/* Layout Wrapper */
.main-body {
    flex: 1;
    padding: 24px;
}

.survey-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
    max-width: 1320px;
    margin: 0 auto;
}

@media (max-width: 991px) {
    .main-body {
        padding: 14px;
    }

    .survey-wrapper {
        display: block; /* Stack cleanly on mobile/tablet without grid/flex overlaps */
    }
}

/* Mobile Quick Section Selector Menu */
.mobile-nav-bar {
    position: relative;
    z-index: 10;
}

.mobile-section-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 260px;
    overflow-y: auto;
}

.mobile-section-link {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 500;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.mobile-section-link:hover, .mobile-section-link.active {
    background-color: var(--primary-light);
    color: var(--primary-hover);
    font-weight: 700;
}

/* Sidebar Step Nav (Desktop) */
.survey-sidebar {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    height: fit-content;
    position: sticky;
    top: 90px;
}

.sidebar-header h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 16px 0;
}

.step-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: calc(100vh - 220px);
    overflow-y: auto;
}

.step-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 12px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.step-nav-item:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
}

.step-nav-item.active {
    background-color: var(--primary-light);
    color: var(--primary-hover);
    font-weight: 700;
}

.step-num {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: #e2e8f0;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-nav-item.active .step-num {
    background-color: var(--primary-color);
    color: #ffffff;
}

/* Survey Cards */
.survey-card {
    display: none;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 36px;
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.3s ease-in-out;
}

@media (max-width: 768px) {
    .survey-card {
        padding: 20px 16px;
    }
}

.survey-card.active-card {
    display: block;
}

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

.card-header-badge {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.step-tag {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-hover);
    font-weight: 700;
    font-size: 0.8rem;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 10px;
}

.card-header-badge h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-main);
    margin: 0 0 6px 0;
}

.section-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0;
}

/* Question Blocks */
.questions-container {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.question-block {
    background-color: #fafafa;
    border: 1px solid #f1f5f9;
    border-radius: 10px;
    padding: 20px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.question-block:focus-within {
    border-color: #93c5fd;
    box-shadow: 0 0 0 3px rgba(147, 197, 253, 0.25);
    background-color: #ffffff;
}

.question-title {
    font-size: 1.02rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 8px;
    display: block;
}

.question-subtext {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: -4px;
    margin-bottom: 12px;
}

.badge-hint {
    font-size: 0.78rem;
    font-weight: 500;
    color: #0284c7;
    background: #e0f2fe;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 6px;
}

/* Custom Checkbox Grid */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
    margin-top: 12px;
}

@media (max-width: 576px) {
    .checkbox-grid {
        grid-template-columns: 1fr;
    }
}

.custom-checkbox {
    display: flex;
    align-items: center;
    position: relative;
    padding: 10px 14px;
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.9rem;
    color: var(--text-main);
    transition: all 0.2s ease;
}

.custom-checkbox:hover {
    border-color: var(--accent-color);
    background-color: #f8fafc;
}

.custom-checkbox input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e1;
    border-radius: 4px;
    margin-right: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.custom-checkbox input:checked ~ .checkmark {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkmark:after {
    content: "";
    display: none;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-bottom: 2px;
}

.custom-checkbox input:checked ~ .checkmark:after {
    display: block;
}

/* Custom Radio Group */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 12px;
}

.custom-radio {
    display: flex;
    align-items: center;
    position: relative;
    padding: 12px 16px;
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.9rem;
    color: var(--text-main);
    transition: all 0.2s ease;
}

.custom-radio:hover {
    border-color: var(--accent-color);
    background-color: #f8fafc;
}

.custom-radio input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radiomark {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e1;
    border-radius: 50%;
    margin-right: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.custom-radio input:checked ~ .radiomark {
    border-color: var(--primary-color);
}

.radiomark:after {
    content: "";
    display: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--primary-color);
}

.custom-radio input:checked ~ .radiomark:after {
    display: block;
}

/* Form Controls */
.form-control {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.92rem;
    color: var(--text-main);
    background-color: #ffffff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    outline: none;
}

/* Card Navigation Footer */
.card-footer-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: 600;
    padding: 10px 24px;
    border-radius: 8px;
}

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

.btn-secondary {
    background-color: #f1f5f9;
    border-color: #cbd5e1;
    color: #475569;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 8px;
}

.btn-secondary:hover {
    background-color: #e2e8f0;
    color: #1e293b;
}

.btn-submit-final {
    padding: 12px 32px;
    font-size: 1.05rem;
    font-weight: 700;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.alert-success-custom {
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
    border-radius: 8px;
    padding: 14px 20px;
}

/* Footer */
.app-footer {
    background-color: #0f172a;
    border-top: 1px solid #1e293b;
    padding: 20px 0;
    color: #94a3b8;
    font-size: 0.82rem;
    margin-top: 40px;
}