:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --primary: #38bdf8;
    --secondary: #818cf8;
    --accent: #f472b6;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image:
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(129, 140, 248, 0.15) 0px, transparent 50%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
}

/* Glass Card */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Login Form */
.login-container {
    max-width: 450px;
    margin: 0 auto;
    text-align: center;
}

.login-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input,
select {
    width: 100%;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

button {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

/* Day List */
.day-list {
    list-style: none;
    margin-bottom: 2rem;
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem;
}

.day-item {
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-muted);
    font-weight: 500;
}

.day-item:last-child {
    margin-bottom: 0;
}

.day-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.day-item.active {
    background: linear-gradient(90deg, rgba(56, 189, 248, 0.2), transparent);
    color: var(--primary);
    border-left: 3px solid var(--primary);
}

/* Exercise Cards */
.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.exercise-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--glass-border);
    transition: transform 0.3s ease;
}

.exercise-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.exercise-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.stat-box {
    text-align: center;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.75rem;
    border-radius: 8px;
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: 0.25rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Utility */

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    width: 90%;
    max-width: 500px;
}

/* Utilities - Must be last to override others */
.hidden {
    display: none !important;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .exercises-grid {
        grid-template-columns: 1fr;
        /* Full width cards on mobile */
    }

    .glass-panel {
        padding: 1.5rem;
        /* Less padding on mobile */
    }

    .dashboard-header h1 {
        font-size: 1.5rem;
    }
}