:root {
    --primary-color: #3b82f6;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-radius: 24px;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --font-family: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 1200px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 0 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.date-display {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.summary-card {
    grid-column: 1 / -1;
    text-align: center;
}

.summary-card h2 {
    margin-bottom: 2rem;
    font-weight: 600;
}

.progress-rings {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 2rem;
}

.ring-container {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring__circle {
    transition: stroke-dashoffset 0.5s ease-in-out;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    stroke-linecap: round;
}

.ring-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
}

.goal-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.tracker-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.current-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.unit {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-left: 0.2rem;
}

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

button {
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

.btn-icon {
    background: #e5e7eb;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: #d1d5db;
}

/* Specific Card Accents */
.water-card .current-value {
    color: var(--primary-color);
}

.sleep-card .current-value {
    color: var(--secondary-color);
}

.activity-card .current-value {
    color: var(--success-color);
}

.water-card .btn-primary {
    background: var(--primary-color);
}

.sleep-card .btn-primary {
    background: var(--secondary-color);
}

.activity-card .btn-primary {
    background: var(--success-color);
}

/* Range Input Styling */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    margin-top: -8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: #e5e7eb;
    border-radius: 2px;
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

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