:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #a855f7;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success: #22c55e;
    --danger: #ef4444;
    --border: rgba(255, 255, 255, 0.1);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

body {
    background: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(225,39%,30%,0.3) 0, transparent 50%), 
        radial-gradient(at 100% 0%, hsla(339,49%,30%,0.3) 0, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
}

/* Glass Card Style */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

/* Form Elements */
h1, h2, h3 {
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

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

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

input, textarea, select {
    width: 100%;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    transition: all 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--glass);
    color: white;
    border: 1px solid var(--glass-border);
}

/* Calendar Specific */
.clock-display {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--primary);
    text-shadow: 0 0 20px rgba(67, 97, 238, 0.3);
    font-family: 'Inter', sans-serif;
    letter-spacing: -1px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.day {
    aspect-ratio: 1/1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-size: 0.9rem;
    position: relative;
    cursor: pointer;
}

.day:hover {
    background: var(--glass);
}

.day.today {
    background: var(--primary);
    font-weight: bold;
}

.day.has-event::after {
    content: '';
    position: absolute;
    bottom: 4px;
    width: 4px;
    height: 4px;
    background: var(--secondary);
    border-radius: 50%;
}

/* Event List */
.event-item {
    padding: 12px;
    background: var(--glass);
    border-left: 4px solid var(--primary);
    border-radius: 8px;
    margin-bottom: 12px;
    position: relative;
}

.event-time {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.delete-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    color: var(--danger);
    cursor: pointer;
    opacity: 0.5;
}

.delete-btn:hover {
    opacity: 1;
}

/* Navigation */
.nav-bottom {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-around;
    padding: 12px;
    z-index: 100;
}

.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.nav-item.active {
    color: var(--primary);
}

.hidden {
    display: none !important;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}