/* Schubert Cars Calculator - Premium Design */

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

:root {
    /* Light mode defaults */
    --bg-primary: transparent;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-input-disabled: #F3F4F6;
    --bg-results: #F9FAFB;
    --bg-gains: linear-gradient(135deg, #FEF2F2 0%, #ffffff 60%);
    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --text-muted: #6B7280;
    --text-disabled: #9CA3AF;
    --border-color: #E5E7EB;
    --border-focus: #DC2626;
    --accent: #DC2626;
    --accent-dark: #B91C1C;
    --accent-light: #EF4444;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.1);
    --shadow-btn: 0 4px 14px rgba(220, 38, 38, 0.3);
    --shadow-btn-hover: 0 8px 25px rgba(220, 38, 38, 0.45);
}

/* Dark mode variables */
body.dark-mode {
    --bg-primary: transparent;
    --bg-card: #1F2937;
    --bg-input: #374151;
    --bg-input-disabled: #1F2937;
    --bg-results: #111827;
    --bg-gains: linear-gradient(135deg, rgba(220, 38, 38, 0.12) 0%, #1F2937 60%);
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-muted: #9CA3AF;
    --text-disabled: #6B7280;
    --border-color: #374151;
    --border-focus: #DC2626;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.3);
    --shadow-btn: 0 4px 14px rgba(220, 38, 38, 0.4);
    --shadow-btn-hover: 0 8px 25px rgba(220, 38, 38, 0.55);
}

html,
body {
    background: transparent !important;
    overflow: visible !important;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary) !important;
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 100%;
    margin: 0;
    padding: 0;
}

.calculator-card {
    background: transparent;
    padding: 0;
}

/* ==================== FORM GRID ==================== */
.form {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
    margin-bottom: 32px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ==================== LABELS ==================== */
.form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.02em;
}

.form-label i {
    color: var(--accent);
    font-size: 1rem;
}

/* ==================== SELECT INPUTS ==================== */
.select-wrapper {
    position: relative;
}

.form-select {
    width: 100%;
    padding: 14px 45px 14px 18px;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    appearance: none;
    -webkit-appearance: none;
    font-family: 'Inter', sans-serif;
    box-shadow: var(--shadow-sm);
}

.form-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15), var(--shadow-md);
    background: var(--bg-input);
}

.form-select:hover:not(:disabled) {
    border-color: #9CA3AF;
    box-shadow: var(--shadow-md);
}

.form-select:disabled {
    background: var(--bg-input-disabled);
    color: var(--text-disabled);
    cursor: not-allowed;
    border-color: var(--border-color);
    box-shadow: none;
    opacity: 0.7;
}

.form-select option {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 12px;
}

.select-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    transition: all 0.3s;
    font-size: 0.8rem;
}

.form-select:focus+.select-icon {
    transform: translateY(-50%) rotate(180deg);
    color: var(--accent);
}

.form-select:disabled+.select-icon {
    color: var(--text-disabled);
    opacity: 0.5;
}

/* ==================== CALCULATE BUTTON ==================== */
.btn-calculate {
    background: linear-gradient(135deg, #DC2626 0%, #B91C1C 100%);
    color: #ffffff;
    border: none;
    padding: 16px 48px;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 8px;
    box-shadow: var(--shadow-btn);
    grid-column: 1 / -1;
    letter-spacing: 0.01em;
    width: 100%;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
    font-family: 'Inter', sans-serif;
    position: relative;
    overflow: hidden;
}

.btn-calculate::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.5s ease;
}

.btn-calculate:hover:not(:disabled)::before {
    left: 100%;
}

.btn-calculate:hover:not(:disabled) {
    background: linear-gradient(135deg, #B91C1C 0%, #991B1B 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn-hover);
}

.btn-calculate:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-btn);
}

.btn-calculate:disabled {
    background: var(--bg-input-disabled);
    color: var(--text-disabled);
    cursor: not-allowed;
    box-shadow: none;
    border: 2px solid var(--border-color);
}

body.dark-mode .btn-calculate:disabled {
    background: #374151;
    color: #6B7280;
    border-color: #4B5563;
}

/* ==================== RESULTS SECTION ==================== */
.results {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 2px solid var(--border-color);
}

.results.hidden {
    display: none;
}

.results h3 {
    color: var(--text-primary);
    margin-bottom: 28px;
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.results h3 i {
    color: var(--accent);
    font-size: 1.6rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* ==================== RESULT CARDS ==================== */
.result-card {
    background: var(--bg-card);
    border-radius: 14px;
    border: 1px solid var(--border-color);
    padding: 28px 24px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    border-radius: 14px 14px 0 0;
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.result-card.original::before {
    background: linear-gradient(90deg, #6B7280, #9CA3AF);
}

.result-card.stage1::before {
    background: linear-gradient(90deg, #DC2626, #EF4444);
}

.result-card.gains {
    background: var(--bg-gains);
}

.result-card.gains::before {
    background: linear-gradient(90deg, #DC2626, #F59E0B);
    height: 5px;
}

.result-card h4 {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    text-align: center;
}

.result-card.stage1 h4 {
    color: var(--accent);
}

.result-card.gains h4 {
    color: var(--accent);
}

.metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.metric:last-child {
    margin-bottom: 0;
    border-bottom: none;
}

.metric-label {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

.metric-value {
    font-weight: 800;
    font-size: 2rem;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1;
}

.metric-value.gain {
    color: var(--accent);
    text-shadow: 0 0 20px rgba(220, 38, 38, 0.2);
}

.metric-unit {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: 4px;
    font-weight: 600;
}

/* ==================== LOADING ANIMATION ==================== */
.loading {
    position: relative;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(220, 38, 38, 0.12), transparent);
    animation: loading 1.2s infinite;
    border-radius: 10px;
}

@keyframes loading {
    0% {
        left: -100%;
    }

    100% {
        left: 100%;
    }
}

.loading .select-icon {
    animation: spin 1s linear infinite;
    color: var(--accent);
}

@keyframes spin {
    from {
        transform: translateY(-50%) rotate(0deg);
    }

    to {
        transform: translateY(-50%) rotate(360deg);
    }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .form {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .results-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .btn-calculate {
        padding: 14px 36px;
        font-size: 1rem;
        max-width: 100%;
    }

    .metric-value {
        font-size: 1.6rem;
    }

    .results h3 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .form {
        gap: 16px;
    }

    .form-select {
        padding: 12px 40px 12px 14px;
        font-size: 0.9rem;
    }
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results:not(.hidden) {
    animation: fadeInUp 0.5s ease-out;
}

.result-card {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.result-card:nth-child(1) {
    animation-delay: 0.1s;
}

.result-card:nth-child(2) {
    animation-delay: 0.2s;
}

.result-card:nth-child(3) {
    animation-delay: 0.3s;
}