:root {
    --bg-color: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.7);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary-color: #334155;
    --primary-hover: #0f172a;
    --accent-color: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.2);
    --success-color: #10b981;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Subtle background pattern */
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 40px 40px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* Header */
.header {
    padding: 3rem 0;
    text-align: left;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.logo span {
    color: var(--accent-color);
    font-weight: 300;
}

/* Navigation */
.nav {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    /* Hide scrollbar */
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.nav::-webkit-scrollbar {
    display: none;
}

.nav-btn {
    background: transparent;
    border: none;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 100px;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-btn:hover {
    color: var(--text-main);
    background: rgba(148, 163, 184, 0.1);
}

.nav-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(51, 65, 85, 0.2);
}

/* Calculators */
main {
    flex-grow: 1;
    padding-bottom: 5rem;
}

.calculator-section {
    opacity: 1;
    transition: opacity 0.4s ease;
    display: block;
}

.hidden {
    display: none !important;
    opacity: 0;
}

.glassmorphism {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.6);
    padding: 3rem;
}

.calculator-card h2 {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* Forms */
.calculator-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.double-inputs {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
}

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

label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input,
select {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.8);
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--text-main);
    transition: var(--transition);
    outline: none;
}

input:focus,
select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(148, 163, 184, 0.1);
    background: #fff;
}

.input-with-symbol {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 1.25rem;
    color: var(--text-muted);
    font-weight: 500;
}

.input-with-symbol input {
    padding-left: 2.5rem;
}

/* Buttons */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1.25rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.15);
}

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

/* Results Area */
.result-display {
    border-top: 1px solid var(--border-color);
    padding-top: 2.5rem;
    margin-top: 1rem;
    animation: slideUp 0.5s ease forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

.result-box {
    text-align: center;
    margin-bottom: 2rem;
}

.result-box h3 {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -2px;
}

.result-details {
    background: rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
}

.detail-row span {
    color: var(--text-muted);
}

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

.health-indicator {
    text-align: center;
    font-weight: 500;
    margin-top: -1rem;
    font-size: 1.1rem;
}

.health-good {
    color: var(--success-color);
}

.health-warning {
    color: #f59e0b;
}

.health-danger {
    color: #ef4444;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .glassmorphism {
        padding: 2rem 1.5rem;
    }

    .result-value {
        font-size: 2.5rem;
    }

    .header {
        padding: 2rem 0;
    }

    .double-inputs {
        grid-template-columns: 1fr;
    }
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 3rem 0;
    margin-top: 2rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

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

.selector-group label {
    color: var(--accent-color);
    margin-right: 0.5rem;
}

.footer-select {
    padding: 0.5rem 2rem 0.5rem 1rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    width: auto;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='white' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 0.75rem) center;
}

.footer-select:focus {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: white;
    box-shadow: none;
}

.footer-select option {
    background: var(--primary-color);
    color: white;
}

.footer-copyright {
    width: 100%;
    text-align: center;
    color: var(--accent-color);
    font-size: 0.85rem;
    padding-top: 2rem;
    margin-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    z-index: 1000;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.1);
}

.cookie-banner p {
    margin: 0;
    font-size: 0.9rem;
    flex: 1;
    min-width: 300px;
}

.cookie-banner a {
    color: var(--primary-color);
    font-weight: 600;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }

    .footer-links {
        justify-content: center;
    }
}