/**
 * TMS Safety Calculator — Premium Dark Theme
 * Glassmorphism + Inter font + refined color system
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ===== Design Tokens — NIBS Education Palette ===== */
/* Light theme is default */
:root {
    --bg-primary: #F4F7FB;
    --bg-secondary: #E8EFF8;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-card-solid: #FFFFFF;
    --bg-input: rgba(255, 255, 255, 0.9);
    --bg-hover: rgba(219, 234, 254, 0.6);

    --glass-border: rgba(27, 58, 107, 0.12);
    --glass-blur: 18px;

    --accent: #2563EB;
    --accent-glow: rgba(37, 99, 235, 0.18);
    --accent-hover: #1D4ED8;
    --orange: #F97316;
    --orange-glow: rgba(249, 115, 22, 0.18);

    --text-primary: #1B3A6B;
    --text-secondary: #3D5A8A;
    --text-muted: #64748B;
    --text-label: #1B3A6B;

    --success: #16a34a;
    --success-bg: rgba(22, 163, 74, 0.08);
    --success-border: rgba(22, 163, 74, 0.3);

    --warning: #d97706;
    --warning-bg: rgba(217, 119, 6, 0.08);
    --warning-border: rgba(217, 119, 6, 0.3);

    --danger: #dc2626;
    --danger-bg: rgba(220, 38, 38, 0.08);
    --danger-border: rgba(220, 38, 38, 0.3);

    --info: #2563EB;
    --info-bg: rgba(37, 99, 235, 0.08);
    --info-border: rgba(37, 99, 235, 0.3);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;

    --shadow-sm: 0 2px 8px rgba(27, 58, 107, 0.08);
    --shadow-md: 0 8px 32px rgba(27, 58, 107, 0.12);
    --shadow-glow: 0 0 20px var(--accent-glow);

    --transition-fast: 0.18s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
}

/* Subtle gradient background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(37,99,235,0.06) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 90%, rgba(249,115,22,0.04) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: rgba(148,163,184,0.2);
    border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(148,163,184,0.35);
}

/* ===== Navbar / Header ===== */
.navbar {
    background: #1B3A6B !important;
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid rgba(27, 58, 107, 0.2);
    box-shadow: 0 1px 24px rgba(27, 58, 107, 0.2);
    padding: 0.85rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
    color: #FFFFFF !important;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}


.navbar-text {
    color: var(--text-secondary) !important;
    font-size: 0.85rem;
}

/* ===== Mode Selector Toggle ===== */
.btn-group {
    display: flex;
    gap: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--glass-blur));
}

.btn-check + .btn-outline-primary,
.btn-check + .btn-outline-secondary {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    padding: 1rem 1.5rem;
    font-weight: 500;
    font-size: 0.92rem;
    transition: all var(--transition-normal);
    border-radius: 0;
}

.btn-check + .btn-outline-primary small,
.btn-check + .btn-outline-secondary small {
    color: var(--text-muted);
    font-size: 0.78rem;
}

.btn-check:checked + .btn-outline-primary,
.btn-check:checked + .btn-outline-secondary {
    background: linear-gradient(135deg, rgba(6,182,212,0.15), rgba(6,182,212,0.05));
    color: var(--accent);
    box-shadow: inset 0 -2px 0 var(--accent);
}

.btn-check:checked + .btn-outline-primary small,
.btn-check:checked + .btn-outline-secondary small {
    color: var(--accent);
    opacity: 0.7;
}

/* ===== Layout ===== */
.container-fluid {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 0 auto;
}

.row {
    margin-bottom: 0;
}

.col-lg-6 {
    margin-bottom: 1.5rem;
}

/* ===== Glass Cards ===== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    margin-bottom: 1.25rem;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.card-header {
    border-radius: 0 !important;
    border-bottom: 1px solid var(--glass-border);
    padding: 1.1rem 1.5rem;
    font-weight: 600;
}

.card-header.bg-primary {
    background: linear-gradient(135deg, rgba(6,182,212,0.12), rgba(99,102,241,0.08)) !important;
    color: var(--accent) !important;
}

.card-header.bg-secondary {
    background: linear-gradient(135deg, rgba(148,163,184,0.08), rgba(99,102,241,0.06)) !important;
    color: var(--text-primary) !important;
}

.card-header.bg-info {
    background: linear-gradient(135deg, rgba(56,189,248,0.1), rgba(6,182,212,0.06)) !important;
    color: var(--info) !important;
}

.card-header.bg-warning {
    background: linear-gradient(135deg, rgba(251,191,36,0.1), rgba(245,158,11,0.06)) !important;
    color: var(--warning) !important;
}

.card-header h5 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.card-body {
    padding: 1.5rem;
}

/* ===== Section Headers ===== */
h5 {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.05rem;
}

h6 {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

hr {
    border-color: var(--glass-border);
    margin: 1.5rem 0;
    opacity: 0.6;
}

/* ===== Form Elements ===== */
.form-label {
    font-weight: 500;
    color: var(--text-label);
    margin-bottom: 0.45rem;
    font-size: 0.88rem;
}

.form-control,
.form-select {
    background: var(--bg-input);
    border: 1px solid rgba(148,163,184,0.15);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 0.65rem 0.85rem;
    font-size: 0.92rem;
    font-family: 'Inter', sans-serif;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

.form-control:focus,
.form-select:focus {
    background: var(--bg-input);
    border-color: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
    outline: none;
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='%2394a3b8' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e") !important;
    background-repeat: no-repeat !important;
    background-position: right 0.75rem center !important;
    background-size: 16px 12px !important;
    padding-right: 2.25rem;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.form-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Input Groups */
.input-group {
    box-shadow: none;
}

.input-group-text {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(148,163,184,0.15);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.82rem;
    min-width: 60px;
    justify-content: center;
}

.input-group .form-control:focus ~ .input-group-text,
.input-group:focus-within .input-group-text {
    border-color: var(--accent);
}

small.form-text {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Checkbox / Medical History */
.form-check {
    padding-left: 1.8rem;
    margin-bottom: 0.85rem;
}

.form-check-input {
    margin-top: 0.3rem;
    cursor: pointer;
    width: 1.15em;
    height: 1.15em;
    background-color: var(--bg-input);
    border: 1.5px solid rgba(148,163,184,0.25);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.form-check-input:checked {
    background-color: var(--accent);
    border-color: var(--accent);
}

.form-check-input:focus {
    box-shadow: 0 0 0 3px var(--accent-glow);
    border-color: var(--accent);
}

.form-check-label {
    cursor: pointer;
    user-select: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

textarea.form-control {
    resize: vertical;
    min-height: 60px;
}

/* ===== Buttons ===== */
.btn {
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    border-radius: var(--radius-sm);
    padding: 0.65rem 1.4rem;
    font-size: 0.9rem;
    transition: all var(--transition-normal);
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #0891b2);
    border: none;
    color: #fff;
    box-shadow: 0 4px 16px rgba(6,182,212,0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover), #06b6d4);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(6,182,212,0.35);
    color: #fff;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(148,163,184,0.1);
    border: 1px solid rgba(148,163,184,0.2);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: rgba(148,163,184,0.2);
    color: var(--text-primary);
    transform: translateY(-1px);
    border-color: rgba(148,163,184,0.3);
}

.btn-outline-danger {
    color: var(--danger);
    border-color: var(--danger-border);
    background: transparent;
}

.btn-outline-danger:hover {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: var(--danger);
}

.btn-sm {
    padding: 0.4rem 0.9rem;
    font-size: 0.8rem;
}

.d-grid {
    margin-top: 1.5rem;
}

/* ===== Alerts ===== */
.alert {
    border-radius: var(--radius-md);
    border: none;
    padding: 1.1rem 1.4rem;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(8px);
    animation: alertSlideIn 0.4s ease;
}

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

.alert-success {
    background: var(--success-bg);
    color: var(--success);
    border-left: 4px solid var(--success);
    box-shadow: 0 0 20px rgba(52,211,153,0.06);
}

.alert-warning {
    background: var(--warning-bg);
    color: var(--warning);
    border-left: 4px solid var(--warning);
    box-shadow: 0 0 20px rgba(251,191,36,0.06);
}

.alert-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border-left: 4px solid var(--danger);
    box-shadow: 0 0 20px rgba(248,113,113,0.06);
}

.alert-info {
    background: var(--info-bg);
    color: var(--info);
    border-left: 4px solid var(--info);
    box-shadow: 0 0 20px rgba(56,189,248,0.06);
}

.alert-heading {
    font-weight: 700;
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
}

.alert p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== Tables ===== */
.table {
    font-size: 0.88rem;
    margin-bottom: 0;
    color: var(--text-primary);
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-primary);
}

.table thead th {
    background: rgba(30, 41, 59, 0.5);
    border-top: none;
    border-bottom: 1px solid var(--glass-border);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    padding: 0.7rem;
}

.table-light {
    --bs-table-bg: rgba(30, 41, 59, 0.5) !important;
    --bs-table-color: var(--text-secondary) !important;
}

.table-sm td,
.table-sm th {
    padding: 0.6rem 0.7rem;
}

.table-bordered td,
.table-bordered th {
    border-color: var(--glass-border);
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
    --bs-table-bg-type: rgba(30, 41, 59, 0.3);
    color: var(--text-primary);
}

.table-success {
    --bs-table-bg: var(--success-bg) !important;
    --bs-table-color: var(--success) !important;
    color: var(--success) !important;
}

.table-warning {
    --bs-table-bg: var(--warning-bg) !important;
    --bs-table-color: var(--warning) !important;
    color: var(--warning) !important;
}

.table-danger {
    --bs-table-bg: var(--danger-bg) !important;
    --bs-table-color: var(--danger) !important;
    color: var(--danger) !important;
}

.table-responsive {
    border-radius: var(--radius-sm);
    overflow: hidden;
}

/* ===== Badges ===== */
.badge {
    font-size: 0.78rem;
    padding: 0.35rem 0.75rem;
    font-weight: 600;
    border-radius: 6px;
    letter-spacing: 0.02em;
}

.bg-success {
    background: linear-gradient(135deg, rgba(52,211,153,0.2), rgba(16,185,129,0.15)) !important;
    color: var(--success) !important;
    border: 1px solid var(--success-border);
}

.bg-warning {
    background: linear-gradient(135deg, rgba(251,191,36,0.2), rgba(245,158,11,0.15)) !important;
    color: var(--warning) !important;
    border: 1px solid var(--warning-border);
}

.bg-danger {
    background: linear-gradient(135deg, rgba(248,113,113,0.2), rgba(239,68,68,0.15)) !important;
    color: var(--danger) !important;
    border: 1px solid var(--danger-border);
}

.bg-info {
    background: linear-gradient(135deg, rgba(56,189,248,0.2), rgba(6,182,212,0.15)) !important;
    color: var(--info) !important;
    border: 1px solid var(--info-border);
}

.bg-secondary {
    background: rgba(100, 116, 139, 0.2) !important;
    color: var(--text-secondary) !important;
    border: 1px solid rgba(100,116,139,0.3);
}

/* Badge in navbar */
#modeIndicator {
    font-size: 0.78rem;
}

/* ===== Lists ===== */
.list-unstyled li {
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.list-unstyled li strong {
    color: var(--text-label);
}

.text-danger {
    color: var(--danger) !important;
}

.text-success {
    color: var(--success) !important;
}

.text-warning {
    color: var(--warning) !important;
}

.text-info {
    color: var(--info) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.text-white {
    color: var(--text-primary) !important;
}

.text-dark {
    color: var(--text-primary) !important;
}

/* ===== Safety Guidelines Reference ===== */
.card-header.bg-warning h5 {
    color: var(--warning);
}

ul.small {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.8;
}

ul.small li {
    margin-bottom: 0.25rem;
}

ul.small li strong {
    color: var(--text-label);
}

/* ===== Results Section ===== */
#resultsSection {
    animation: fadeSlideIn 0.45s ease;
}

#calculatedValuesSection,
#estimatedParametersSection {
    animation: fadeSlideIn 0.35s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Chart ===== */
#safetyChart {
    max-height: 400px;
    margin-bottom: 1rem;
    border-radius: var(--radius-sm);
}

/* ===== Footer ===== */
footer {
    background: rgba(11, 15, 26, 0.9) !important;
    backdrop-filter: blur(var(--glass-blur));
    border-top: 1px solid var(--glass-border);
    margin-top: auto;
    padding: 1.5rem 0;
}

footer p {
    margin: 0.35rem 0;
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--text-muted);
}

footer p strong {
    color: var(--warning);
}

/* ===== Responsive ===== */
@media (max-width: 991.98px) {
    .col-lg-6 {
        margin-bottom: 1rem;
    }
}

@media (max-width: 768px) {
    .container-fluid {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }

    .card {
        border-radius: var(--radius-md);
        margin-bottom: 1rem;
    }

    .card-body {
        padding: 1.1rem;
    }

    .table {
        font-size: 0.78rem;
    }

    .btn {
        padding: 0.55rem 1rem;
        font-size: 0.85rem;
    }

    .alert {
        font-size: 0.85rem;
        padding: 0.9rem 1rem;
    }

    footer p {
        font-size: 0.75rem;
    }

    .navbar-brand {
        font-size: 1.1rem;
    }

    .btn-check + .btn-outline-primary,
    .btn-check + .btn-outline-secondary {
        padding: 0.75rem 0.75rem;
        font-size: 0.82rem;
    }
}

/* ===== Print ===== */
@media print {
    body {
        background: white;
        color: #000;
    }

    body::before {
        display: none;
    }

    .card {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #dee2e6;
        background: white;
        backdrop-filter: none;
    }

    .btn, footer, .navbar {
        display: none;
    }
}

/* ===== Accessibility ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ===== Light Theme — Component Overrides ===== */

/* Cards: visible border and shadow */
[data-theme="light"] .card {
    border: 1px solid #DBEAFE !important;
    box-shadow: 0 2px 12px rgba(27, 58, 107, 0.08) !important;
    background: #FFFFFF !important;
}

/* Input fields */
[data-theme="light"] .form-control,
[data-theme="light"] .form-select {
    background: #FFFFFF;
    border-color: #BFDBFE;
    color: #1B3A6B;
}

[data-theme="light"] .form-control::placeholder {
    color: #94A3B8;
}

[data-theme="light"] .form-control:focus,
[data-theme="light"] .form-select:focus {
    background: #FFFFFF;
    border-color: #2563EB;
    color: #1B3A6B;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

/* Input group suffix labels (%, Hz, %RMT, seconds) */
[data-theme="light"] .input-group-text {
    background: #EFF6FF;
    border-color: #BFDBFE;
    color: #1B3A6B;
    font-weight: 500;
}

/* Tables */
[data-theme="light"] .table {
    color: #1B3A6B;
    --bs-table-color: #1B3A6B;
}

[data-theme="light"] .table thead th {
    background: #EFF6FF;
    color: #1B3A6B;
    border-color: #DBEAFE;
}

[data-theme="light"] .table td,
[data-theme="light"] .table th {
    border-color: #DBEAFE;
}

[data-theme="light"] .table-striped > tbody > tr:nth-of-type(odd) > * {
    --bs-table-bg-type: #F0F7FF;
    color: #1B3A6B;
}

[data-theme="light"] .table-dark {
    --bs-table-bg: #EFF6FF;
    --bs-table-color: #1B3A6B;
    --bs-table-border-color: #DBEAFE;
    --bs-table-striped-bg: #E0ECFF;
    --bs-table-striped-color: #1B3A6B;
}

/* Form check inputs */
[data-theme="light"] .form-check-input {
    background-color: #FFFFFF;
    border-color: #BFDBFE;
}

[data-theme="light"] .form-check-input:checked {
    background-color: #2563EB;
    border-color: #2563EB;
}

/* Btn secondary */
[data-theme="light"] .btn-secondary {
    background: #EFF6FF;
    border-color: #BFDBFE;
    color: #1B3A6B;
}

[data-theme="light"] .btn-secondary:hover {
    background: #DBEAFE;
    border-color: #93C5FD;
    color: #1B3A6B;
}

/* Select dropdown options */
[data-theme="light"] .form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='%231B3A6B' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e") !important;
}

[data-theme="light"] .form-select option {
    background: #FFFFFF;
    color: #1B3A6B;
}

/* Nav tabs */
[data-theme="light"] .nav-tabs {
    border-bottom-color: #DBEAFE;
}

[data-theme="light"] .nav-tabs .nav-link {
    color: #3D5A8A;
}

[data-theme="light"] .nav-tabs .nav-link.active {
    color: #1B3A6B;
    background: #FFFFFF;
    border-color: #DBEAFE #DBEAFE #FFFFFF;
    font-weight: 600;
}

[data-theme="light"] .nav-tabs .nav-link:hover:not(.active) {
    color: #1B3A6B;
    border-color: #F97316 #F97316 transparent;
    background: rgba(249, 115, 22, 0.05);
}

/* Card headers */
[data-theme="light"] .card-header {
    background: #1B3A6B !important;
    color: #FFFFFF !important;
    border-bottom: none;
}

[data-theme="light"] .card-header h5,
[data-theme="light"] .card-header h6,
[data-theme="light"] .card-header .h5,
[data-theme="light"] .card-header span,
[data-theme="light"] .card-header strong {
    color: #FFFFFF !important;
}

[data-theme="light"] .card-header.bg-primary,
[data-theme="light"] .card-header.bg-secondary,
[data-theme="light"] .card-header.bg-info,
[data-theme="light"] .card-header.bg-warning {
    background: #1B3A6B !important;
    color: #FFFFFF !important;
}

/* ===== Dark Theme — NIBS Navy ===== */
[data-theme="dark"] {
    --bg-primary: #0D1E3A;
    --bg-secondary: #112348;
    --bg-card: rgba(27, 58, 107, 0.55);
    --bg-card-solid: #1B3A6B;
    --bg-input: rgba(13, 30, 58, 0.8);
    --bg-hover: rgba(37, 99, 235, 0.15);

    --glass-border: rgba(255, 255, 255, 0.08);

    --accent: #F97316;
    --accent-glow: rgba(249, 115, 22, 0.25);
    --accent-hover: #FB923C;
    --orange: #F97316;
    --orange-glow: rgba(249, 115, 22, 0.25);

    --text-primary: #F4F7FB;
    --text-secondary: #BFCFE8;
    --text-muted: #7A96BC;
    --text-label: #DBEAFE;

    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.1);
    --success-border: rgba(52, 211, 153, 0.35);

    --warning: #fbbf24;
    --warning-bg: rgba(251, 191, 36, 0.1);
    --warning-border: rgba(251, 191, 36, 0.35);

    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.1);
    --danger-border: rgba(248, 113, 113, 0.35);

    --info: #60A5FA;
    --info-bg: rgba(96, 165, 250, 0.1);
    --info-border: rgba(96, 165, 250, 0.35);

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.35);
    --shadow-md: 0 8px 32px rgba(0,0,0,0.45);
    --shadow-glow: 0 0 20px var(--accent-glow);
}

[data-theme="dark"] body::before {
    background:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(37,99,235,0.1) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 90%, rgba(249,115,22,0.07) 0%, transparent 60%);
}

[data-theme="dark"] .navbar {
    background: rgba(13, 30, 58, 0.97) !important;
    border-bottom-color: rgba(255,255,255,0.08);
}

[data-theme="dark"] .navbar-brand,
[data-theme="dark"] .navbar-text {
    color: #F4F7FB !important;
}

[data-theme="dark"] .btn-group {
    background: rgba(27, 58, 107, 0.6);
}

[data-theme="dark"] .btn-check + .btn-outline-primary,
[data-theme="dark"] .btn-check + .btn-outline-secondary {
    color: var(--text-secondary);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background: var(--bg-input);
    border-color: rgba(255,255,255,0.1);
    color: var(--text-primary);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background: rgba(13, 30, 58, 0.95);
    color: var(--text-primary);
}

[data-theme="dark"] .form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='%23BFCFE8' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e") !important;
}

[data-theme="dark"] .form-select option {
    background: #1B3A6B;
    color: var(--text-primary);
}

[data-theme="dark"] .input-group-text {
    background: rgba(27, 58, 107, 0.7);
    border-color: rgba(255,255,255,0.1);
    color: var(--text-secondary);
}

[data-theme="dark"] .form-check-input {
    background-color: #1B3A6B;
    border-color: rgba(255,255,255,0.2);
}

[data-theme="dark"] .btn-secondary {
    background: rgba(96, 165, 250, 0.12);
    border-color: rgba(96, 165, 250, 0.22);
    color: var(--text-secondary);
}

[data-theme="dark"] .table {
    color: var(--text-primary);
    --bs-table-color: var(--text-primary);
}

[data-theme="dark"] .table-light {
    --bs-table-bg: rgba(255,255,255,0.04) !important;
    --bs-table-color: var(--text-secondary) !important;
}

[data-theme="dark"] .table-striped > tbody > tr:nth-of-type(odd) > * {
    --bs-table-bg-type: rgba(255,255,255,0.03);
    color: var(--text-primary);
}

[data-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

[data-theme="dark"] footer {
    background: rgba(13, 30, 58, 0.97) !important;
}

[data-theme="dark"] .btn-unit-toggle {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}


/* ===== Unit Toggle Button (inside input-group) ===== */
.btn-unit-toggle {
    background: var(--accent);
    color: #FFFFFF;
    border: 1px solid var(--accent);
    padding: 0.375rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
    letter-spacing: 0.02em;
}

.btn-unit-toggle:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* ===== Navbar Control Buttons (Theme & Language) ===== */
.btn-ctrl {
    background: transparent;
    border: 1px solid #F97316;
    color: #FFFFFF;
    border-radius: var(--radius-sm);
    padding: 0.3rem 0.7rem;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.btn-ctrl:hover {
    background: rgba(249, 115, 22, 0.18);
    color: #FFFFFF;
    border-color: #FB923C;
}

[data-theme="light"] .btn-ctrl {
    border-color: #FFFFFF;
}

[data-theme="light"] .btn-ctrl:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: #FFFFFF;
}

/* ===== Language Dropdown (created by NIBS.i18n.initDropdowns) ===== */
.lang-dropdown {
    position: relative;
    display: inline-block;
}

.btn-lang {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    background: transparent;
    color: #FFFFFF;
    border: 1px solid #F97316;
    border-radius: var(--radius-sm);
    padding: 0.3rem 0.7rem;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.01em;
    white-space: nowrap;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-lang:hover {
    background: rgba(249, 115, 22, 0.18);
    border-color: #FB923C;
}

[data-theme="light"] .btn-lang {
    border-color: #FFFFFF;
}

[data-theme="light"] .btn-lang:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: #FFFFFF;
}

.lang-chevron {
    font-size: 0.7em;
    opacity: 0.7;
    display: inline-block;
    transition: transform 0.2s;
}

.lang-dropdown.open .lang-chevron {
    transform: rotate(180deg);
}

.lang-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: rgba(10, 21, 38, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 8px;
    list-style: none;
    padding: 0.3rem;
    margin: 0;
    min-width: 100%;
    z-index: 1100;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.lang-dropdown.open .lang-menu {
    display: block;
}

.lang-menu li button {
    display: block;
    width: 100%;
    background: none;
    border: none;
    color: rgba(255,255,255,0.75);
    font-family: 'Inter', sans-serif;
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.07em;
    padding: 0.35rem 0.65rem;
    border-radius: 5px;
    cursor: pointer;
    white-space: nowrap;
    text-align: left;
    transition: background 0.15s, color 0.15s;
}

.lang-menu li button:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.lang-menu li button.active {
    color: #fff;
}

.lang-menu li button.active::before {
    content: '✓ ';
    font-size: 0.7em;
}

/* ===== Print Button ===== */
.btn-print {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.3);
    color: #fff;
    padding: 0.3rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-print:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.55);
}

/* ===== Print Area (hidden on screen) ===== */
#printArea {
    display: none;
}

/* ===== Print Layout ===== */
@media print {
    /* Hide everything on screen except printArea */
    body > *:not(#printArea) {
        display: none !important;
    }

    #printArea {
        display: block !important;
        font-family: 'Inter', Arial, sans-serif;
        font-size: 11pt;
        color: #000;
        background: #fff;
        padding: 1.5cm 2cm;
        width: 100%;
    }

    /* Header */
    .pr-header {
        display: flex;
        justify-content: space-between;
        align-items: flex-end;
        margin-bottom: 0.5cm;
    }

    .pr-logo {
        font-size: 16pt;
        font-weight: 800;
        letter-spacing: -0.02em;
    }

    .pr-tool {
        font-size: 10pt;
        color: #444;
    }

    .pr-patient {
        font-size: 10pt;
        color: #1B3A6B;
        text-align: right;
    }

    .pr-date {
        font-size: 9pt;
        color: #666;
        text-align: right;
    }

    .pr-hr {
        border: none;
        border-top: 2px solid #000;
        margin: 0.3cm 0 0.6cm;
    }

    /* Two-column layout for parameters */
    .pr-columns {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.8cm;
        margin-bottom: 0.5cm;
    }

    .pr-section {
        margin-bottom: 0.5cm;
        break-inside: avoid;
    }

    .pr-section h3 {
        font-size: 10pt;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.08em;
        border-bottom: 1px solid #ccc;
        padding-bottom: 0.1cm;
        margin-bottom: 0.25cm;
        color: #222;
    }

    /* Parameter tables */
    .pr-table {
        width: 100%;
        border-collapse: collapse;
        font-size: 10pt;
    }

    .pr-table td {
        padding: 0.1cm 0.2cm;
        border-bottom: 1px solid #eee;
        vertical-align: top;
    }

    .pr-table td:first-child {
        color: #555;
        width: 55%;
    }

    .pr-table td:last-child {
        font-weight: 600;
    }

    /* Section note (subtitle below heading) */
    .pr-note {
        font-size: 8pt;
        color: #888;
        font-style: italic;
        margin-bottom: 0.2cm;
    }

    /* Status lines */
    .pr-status {
        font-size: 10pt;
        padding: 0.2cm 0.4cm;
        border-radius: 4px;
    }

    .pr-status--safe    { background: #d4edda; color: #155724; }
    .pr-status--caution { background: #fff3cd; color: #856404; }
    .pr-status--unsafe  { background: #f8d7da; color: #721c24; }

    .pr-status-title {
        font-weight: 700;
        font-size: 11pt;
    }

    /* Disclaimer */
    .pr-disclaimer {
        margin-top: 0.8cm;
        padding: 0.3cm 0.5cm;
        border: 1px solid #ccc;
        border-radius: 4px;
        font-size: 8.5pt;
        color: #555;
        break-inside: avoid;
    }
}

/* ===== Tab Navigation ===== */
.nav-tabs {
    border-bottom: 2px solid var(--glass-border);
    gap: 0.25rem;
}

.nav-tabs .nav-link {
    color: var(--text-secondary);
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    background: transparent;
    padding: 0.55rem 1.1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.nav-tabs .nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    border-bottom-color: var(--text-muted);
}

.nav-tabs .nav-link.active {
    color: var(--accent);
    background: transparent;
    border-bottom: 2px solid var(--accent);
    font-weight: 600;
}

[data-theme="light"] .nav-tabs .nav-link { color: var(--text-secondary); }
[data-theme="light"] .nav-tabs .nav-link.active { color: var(--accent); }

/* ===== Questionnaire Items ===== */
#questionnaireForm {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.q-item {
    border-left: 3px solid var(--glass-border);
    padding: 0.7rem 1rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: var(--bg-hover);
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.q-item[data-risk="red"]    { border-left-color: var(--danger); }
.q-item[data-risk="orange"] { border-left-color: var(--warning); }
.q-item[data-risk="yellow"] { border-left-color: #fde68a; }
.q-item[data-risk="info"]   { border-left-color: var(--info); }

.q-item.q-yes[data-risk="red"]    { background: var(--danger-bg); }
.q-item.q-yes[data-risk="orange"] { background: var(--warning-bg); }
.q-item.q-yes[data-risk="yellow"] { background: rgba(253, 230, 138, 0.08); }

/* Pregnancy trimester override: ≤3 months escalates to red */
.q-item[data-risk-override="red"]         { border-left-color: var(--danger); }
.q-item.q-yes[data-risk-override="red"]   { background: var(--danger-bg); }

.q-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.q-content {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    flex: 1;
    min-width: 0;
}

.q-num {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 1.1rem;
    padding-top: 0.15rem;
    flex-shrink: 0;
}

.q-text {
    font-size: 0.875rem;
    color: var(--text-label);
    line-height: 1.5;
}

.q-radios {
    display: flex;
    gap: 0.85rem;
    flex-shrink: 0;
    align-items: center;
    padding-top: 0.1rem;
}

.q-radio-label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
}

.q-radio-label input[type="radio"] {
    cursor: pointer;
    accent-color: var(--accent);
}

.q-item.q-yes .q-radio-yes { color: var(--warning); font-weight: 600; }

.q-detail-row { padding-top: 0.1rem; }

.q-detail-input {
    background: var(--bg-input) !important;
    color: var(--text-primary) !important;
    border-color: var(--glass-border) !important;
    font-size: 0.8rem !important;
}

.q-detail-input:focus {
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 2px var(--accent-glow) !important;
}

/* ===== Print: questionnaire + patient history ===== */
@media print {
    .pr-full-width {
        grid-column: 1 / -1;
    }

    .pr-table-2col td:first-child { width: 75%; color: #333; }
    .pr-table-2col td:last-child  { width: 25%; text-align: center; }

    .pr-history-yes {
        background: #fef9c3 !important;
    }

    .pr-qa-table {
        font-size: 9.5pt;
    }

    .pr-qa-table th {
        background: #f1f5f9 !important;
        font-weight: 700;
        padding: 0.1cm 0.2cm;
        border-bottom: 1px solid #ccc;
        text-align: left;
        font-size: 8.5pt;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: #444;
    }

    .pr-qa-table td {
        padding: 0.1cm 0.2cm;
        border-bottom: 1px solid #eee;
        vertical-align: top;
    }
}

/* Smooth theme transition on key elements */
body, .navbar, .card, .form-control, .form-select,
.input-group-text, .btn-ctrl, .alert, footer {
    transition:
        background-color 0.25s ease,
        border-color 0.25s ease,
        color 0.2s ease,
        box-shadow 0.25s ease;
}