/* ==========================================
   Digital vs Static Calculator - Styles
   SeenLabs 2024
   ========================================== */

:root {
    --primary: var(--sl-blue-primary);
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --static-color: #64748b;
    --digital-color: var(--sl-blue-primary);

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border: #e2e8f0;

    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: 200ms ease;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border: #334155;
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header__logo a {
    display: flex;
}

.header__logo-img {
    height: 36px;
    border-radius: var(--radius-sm);
}

.header__title-group {
    display: flex;
    flex-direction: column;
}

.header__brand {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.header__title {
    font-size: 1.125rem;
    font-weight: 700;
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-family: var(--font-main);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

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

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

.btn--secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border);
}

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

.btn--lg {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

.btn--full {
    width: 100%;
}

/* Main */
.main {
    flex: 1;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Intro */
.intro {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 2rem;
}

.intro h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.intro p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Comparison Layout */
.comparison-layout {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Shared Inputs */
.shared-inputs {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
}

.section-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.section-icon {
    font-size: 1.75rem;
}

.section-header h3 {
    font-size: 1.125rem;
    margin-bottom: 0.125rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.form-group label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input {
    padding: 0.625rem 0.875rem;
    font-family: var(--font-main);
    font-size: 0.9375rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Comparison Cards */
.comparison-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.comparison-card {
    background: var(--bg-primary);
    border: 2px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.comparison-card--static {
    border-top-color: var(--static-color);
}

.comparison-card--digital {
    border-top-color: var(--digital-color);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.comparison-card--static .card-header {
    background: rgba(100, 116, 139, 0.05);
}

.comparison-card--digital .card-header {
    background: rgba(99, 102, 241, 0.05);
}

.card-icon {
    font-size: 1.5rem;
}

.card-header h3 {
    font-size: 1.125rem;
}

.card-section {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.card-section:last-of-type {
    border-bottom: none;
}

.card-section h4 {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.card-totals {
    padding: 1.25rem;
    background: var(--bg-secondary);
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.total-row span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.total-row strong {
    font-size: 1.125rem;
}

.total-row--highlight {
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
    margin-top: 0.25rem;
}

.total-row--highlight strong {
    font-size: 1.375rem;
}

.comparison-card--static .total-row--highlight strong {
    color: var(--static-color);
}

.comparison-card--digital .total-row--highlight strong {
    color: var(--digital-color);
}

/* Results Section */
.results-section {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-top: 2rem;
}

.results-section h2 {
    text-align: center;
    margin-bottom: 1.5rem;
}

/* Winner Banner */
.winner-banner {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.1));
    border: 1px solid var(--primary-light);
}

.winner-banner.static-wins {
    background: linear-gradient(135deg, rgba(100, 116, 139, 0.1), rgba(100, 116, 139, 0.05));
    border-color: var(--static-color);
}

.winner-icon {
    font-size: 2.5rem;
}

.winner-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.winner-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Visual Comparison */
.visual-comparison {
    height: 280px;
    margin-bottom: 2rem;
}

.visual-comparison canvas {
    max-height: 100%;
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
}

.metric-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: 0.375rem;
}

.metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.metric-note {
    font-size: 0.6875rem;
    color: var(--text-tertiary);
}

/* Hidden Costs */
.hidden-costs {
    margin-bottom: 2rem;
}

.hidden-costs h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.hidden-costs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.hidden-cost-item {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.hidden-cost-icon {
    font-size: 1.5rem;
}

.hidden-cost-content strong {
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9375rem;
}

.hidden-cost-content p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Results CTA */
.results-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    max-width: 500px;
}

.footer__links {
    display: flex;
    gap: 1.5rem;
}

.footer__links a {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
}

.footer__links a:hover {
    color: var(--primary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 1000;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-tertiary);
}

.modal-content h3 {
    margin-bottom: 0.5rem;
}

.modal-content>p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .form-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .comparison-cards {
        grid-template-columns: 1fr;
    }

    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hidden-costs-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main {
        padding: 1rem;
    }

    .header {
        padding: 1rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .results-cta {
        flex-direction: column;
    }

    .results-cta .btn {
        width: 100%;
    }

    .footer {
        flex-direction: column;
        text-align: center;
    }
}

/* ==========================================
   FAQ & Methodology Modals
   ========================================== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    overflow-y: auto;
    padding: var(--space-xl);
}

.modal-overlay.active {
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.modal-overlay.active .modal {
    display: block !important;
    position: relative !important;
    opacity: 1 !important;
    visibility: visible !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    transform: none !important;
    max-height: 90vh;
}

.faq-modal,
.methodology-modal {
    position: relative;
    width: 100%;
    max-width: 640px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-xl);
    margin: var(--space-xl) 0;
}

.modal__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
}

.faq-modal__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.faq__item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq__question {
    display: block;
    padding: var(--space-md);
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    background: var(--bg-secondary);
}

.faq__question:hover {
    color: var(--primary);
}

.faq__answer {
    padding: var(--space-md);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.methodology-modal__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.methodology-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.methodology-section p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.methodology-section ul {
    margin: var(--space-sm) 0 0 var(--space-lg);
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.methodology-section ul li {
    margin-bottom: var(--space-xs);
}

.methodology-section--sources {
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.btn__icon-text {
    font-weight: 700;
    font-size: 1rem;
}

/* ==========================================
   Mobile & Accessibility Hardening Layer
   ========================================== */

/* Touch Targets (WCAG 2.1 Target Size) */
.theme-toggle,
.btn--icon,
button,
select,
input[type="text"],
input[type="email"],
input[type="number"],
.form-control,
.btn {
    min-height: 44px;
    /* Accessible touch target */
}

/* Fix iOS Input Zoom & Tap Area */
@media (max-width: 768px) {

    input,
    select,
    textarea {
        font-size: 16px !important;
        /* Prevents auto-zoom on iOS */
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Close Button Fix */
.modal__close,
.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    font-size: 2rem;
    line-height: 1;
    color: var(--text-secondary);
    cursor: pointer;
    z-index: 10;
    padding: 0.5rem;
    transition: color 0.2s;
}

.modal__close:hover,
.modal-close:hover {
    color: var(--danger);
}