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

:root {
    --bg-primary: #0d0d0f;
    --bg-secondary: #16161a;
    --bg-card: #1c1c21;
    --bg-card-hover: #242429;
    --text-primary: #fffffe;
    --text-secondary: #94a1b2;
    --text-muted: #72757e;
    --accent: #7f5af0;
    --accent-hover: #6b46e5;
    --accent-glow: rgba(127, 90, 240, 0.3);
    --success: #2cb67d;
    --warning: #ff8906;
    --danger: #e53170;
    --border: #2e2e35;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

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

/* Header */
header {
    text-align: center;
    padding: 2rem 0;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Language Selector */
.lang-selector {
    margin-bottom: 1rem;
}

.lang-selector select {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a1b2' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.lang-selector select:hover {
    border-color: var(--accent);
}

.lang-selector select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Mode Selector */
.mode-selector {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.mode-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.mode-toggle {
    display: flex;
    gap: 0.5rem;
}

.mode-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.mode-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.mode-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--text-primary);
}

.mode-hint {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Subscriptions Section */
.subscriptions-section h2 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 1.5rem 0 1rem;
    color: var(--text-primary);
}

.subscriptions-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Subscription Card */
.sub-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1rem;
    border: 1px solid var(--border);
    transition: all var(--transition);
    opacity: 0.6;
}

.sub-card.active {
    opacity: 1;
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.sub-header {
    margin-bottom: 0.75rem;
}

/* Custom Checkbox */
.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    height: 22px;
    width: 22px;
    background-color: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 6px;
    margin-right: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.checkbox-container:hover .checkmark {
    border-color: var(--accent);
}

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

.checkbox-container input:checked ~ .checkmark::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: 700;
}

.sub-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.sub-name a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.sub-name a:hover {
    color: var(--accent);
}

/* Breakdown links */
.breakdown-link {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.breakdown-link:hover {
    color: var(--accent);
}

/* Input Groups */
.sub-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.input-group label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.input-group input {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all var(--transition);
    width: 100%;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group input::placeholder {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 1rem;
    margin-top: 2rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.calculate-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

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

/* Results Section */
.results-section {
    margin-top: 2rem;
    display: none;
}

.results-section.visible {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Result Card */
.result-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
    text-align: center;
}

.result-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}

.result-item:last-of-type {
    border-bottom: none;
}

.result-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.result-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.result-period {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-highlight .result-value {
    color: var(--accent);
}

/* Interpretation */
.interpretation {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
}

.interpretation.good {
    background: rgba(44, 182, 125, 0.15);
    color: var(--success);
    border: 1px solid rgba(44, 182, 125, 0.3);
}

.interpretation.warning {
    background: rgba(255, 137, 6, 0.15);
    color: var(--warning);
    border: 1px solid rgba(255, 137, 6, 0.3);
}

.interpretation.bad {
    background: rgba(229, 49, 112, 0.15);
    color: var(--danger);
    border: 1px solid rgba(229, 49, 112, 0.3);
}

.interpretation.terrible {
    background: rgba(229, 49, 112, 0.25);
    color: var(--danger);
    border: 1px solid rgba(229, 49, 112, 0.5);
}

.disclaimer {
    margin-top: 1.25rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Breakdown Card */
.breakdown-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-top: 1rem;
    border: 1px solid var(--border);
}

.breakdown-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.breakdown-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.breakdown-item:last-child {
    border-bottom: none;
}

.breakdown-name {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.breakdown-stats {
    text-align: right;
}

.breakdown-cost {
    font-weight: 600;
    font-size: 0.9rem;
}

.breakdown-per-hour {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Share Section */
.share-section {
    margin-top: 1.5rem;
    text-align: center;
}

.share-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.share-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
}

/* Affiliate Space */
.affiliate-space {
    margin-top: 1.5rem;
    text-align: center;
    display: none;
}

.affiliate-space.visible {
    display: block;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.25rem;
    border: 1px solid var(--border);
}

.affiliate-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.affiliate-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.affiliate-link {
    color: var(--text-primary);
    font-size: 0.85rem;
    text-decoration: none;
    transition: all var(--transition);
    background: var(--bg-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.affiliate-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--bg-card-hover);
}

/* Ad Spaces */
.ad-space {
    min-height: 0;
    display: none; /* Enable when ads are ready */
}

.ad-top {
    margin-bottom: 1rem;
}

.ad-bottom {
    margin-top: 2rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-link {
    margin-top: 0.5rem;
}

.footer-link a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity var(--transition);
}

.footer-link a:hover {
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .result-value {
        font-size: 2rem;
    }
    
    .mode-toggle {
        flex-direction: column;
    }
    
    .mode-btn {
        padding: 0.65rem 1rem;
    }
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Hide number input spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* Print styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .calculate-btn,
    .share-section,
    .ad-space,
    .affiliate-space {
        display: none !important;
    }
}