:root {
    --bg-color: #0b0f19;
    --panel-bg: rgba(255, 255, 255, 0.03);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-1: #38bdf8;
    --accent-2: #818cf8;
    --accent-gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    --danger: #fb7185;
    --success: #34d399;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    padding: 2rem;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(129, 140, 248, 0.05) 0%, transparent 50%);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Header Buttons */
.header-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-danger {
    background: rgba(251, 113, 133, 0.1);
    color: var(--danger);
    border: 1px solid rgba(251, 113, 133, 0.2);
    padding: 0.5rem 1rem;
}

.btn-danger:hover {
    background: rgba(251, 113, 133, 0.2);
}

/* Saved Section */
.saved-section {
    margin-bottom: 3rem;
}

.saved-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-2);
}

.saved-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.saved-card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 1.25rem;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: transform 0.2s;
}

.saved-card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.12);
}

.saved-header h3 {
    font-size: 1.1rem;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.saved-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.saved-actions {
    display: flex;
    gap: 0.5rem;
}

.saved-actions button {
    flex: 1;
}

/* Layout */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 450px;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.12);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 0.75rem;
    color: var(--accent-1);
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.25rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.input-group input, .input-group select {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.input-group select {
    cursor: pointer;
    appearance: none;
}

.input-group select option {
    background: var(--bg-color);
    color: var(--text-main);
}

.input-group input:focus, .input-group select:focus {
    border-color: var(--accent-1);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.result-section {
    position: sticky;
    top: 2rem;
}

.result-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.01) 100%);
    border: 1px solid rgba(129, 140, 248, 0.3);
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px dashed var(--panel-border);
    font-size: 0.95rem;
}

.result-row:last-child {
    border-bottom: none;
}

.result-row .label {
    color: var(--text-muted);
}

.result-row .value {
    font-weight: 600;
    color: var(--text-main);
}

.result-row.highlight .value {
    color: var(--accent-1);
    font-size: 1.05rem;
}

.final-cost {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 15px;
    text-align: center;
    border: 1px solid var(--accent-1);
    box-shadow: 0 0 25px rgba(56, 189, 248, 0.15);
}

.final-cost p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.final-cost h3 {
    font-size: 3rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-color);
    border: 1px solid var(--panel-border);
    border-top: 4px solid var(--accent-2);
    border-radius: 20px;
    padding: 2.5rem;
    width: 90%;
    max-width: 650px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 15px 40px rgba(0,0,0,0.4);
}

.close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.8rem;
    cursor: pointer;
    transition: color 0.3s;
}

.close-btn:hover {
    color: var(--danger);
}

.help-text h2 {
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.help-text h3 {
    color: var(--accent-1);
    margin: 1.5rem 0 0.5rem;
    font-size: 1.15rem;
}

.help-text p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.help-text code {
    background: rgba(255, 255, 255, 0.08);
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    color: var(--accent-2);
    font-family: monospace;
    font-size: 0.95rem;
}