:root {
    --bg-color: #f0f4f8;
    --card-bg: rgba(255, 255, 255, 0.85);
    --accent-color: #0055ff;
    --secondary-accent: #6c00f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background: radial-gradient(circle at top right, #e2e8f0, #f8fafc);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    margin-bottom: 3rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--accent-color), var(--secondary-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
}

/* Dashboard Grid */
.dashboard {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
}

@media (max-width: 900px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
}

/* Glass Card Style */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 12px 48px 0 rgba(0, 242, 255, 0.15);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Input Section */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

select,
input {
    width: 100%;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s, background-color 0.2s;
}

select:focus,
input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.time-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
}

.time-inputs .field {
    text-align: center;
}

.time-inputs span {
    display: block;
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Results Section */
.results-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 600px) {
    .results-container {
        grid-template-columns: 1fr;
    }
}

.vdot-badge {
    grid-column: span 2;
    text-align: center;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(0, 242, 255, 0.1), rgba(112, 0, 255, 0.1));
    border-radius: 15px;
    margin-bottom: 1rem;
}

@media (max-width: 600px) {
    .vdot-badge {
        grid-column: span 1;
    }
}

.vdot-badge .value {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--accent-color);
    line-height: 1;
}

.vdot-badge .label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Table Style */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    padding-bottom: 1rem;
}

td {
    padding: 0.75rem 0;
    border-top: 1px solid var(--border-color);
}

.pace-name {
    font-weight: 600;
}

.pace-value {
    text-align: right;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    color: var(--accent-color);
}

.intensity {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

/* Button UI */
.calculate-btn {
    width: 100%;
    background: linear-gradient(to right, var(--accent-color), var(--secondary-accent));
    border: none;
    border-radius: 12px;
    padding: 1rem;
    color: white;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 1rem;
    transition: transform 0.2s, filter 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(0, 85, 255, 0.3);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

.animate-fade {
    animation: fadeIn 0.5s ease forwards;
}