:root {
    --bg-gradient: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --primary: #7d5fff;
    --secondary: #18dcff;
    --accent: #ffb8b8;
    --text-main: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.6);
    --danger: #ff4d4d;
    --success: #32ff7e;
    --sidebar-width: 260px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    height: 100vh;
    display: flex;
    color: var(--text-main);
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(10px);
}

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background: rgba(0, 0, 0, 0.2);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 2rem;
    transition: var(--transition);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 3rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #fff, var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    padding: 1rem 1.2rem;
    border-radius: 12px;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.nav-btn:hover {
    background: var(--glass-bg);
    color: var(--text-main);
}

.nav-btn.active {
    background: var(--primary);
    color: var(--text-main);
    box-shadow: 0 4px 15px rgba(125, 95, 255, 0.4);
}

/* Main Content Area */
.content {
    flex: 1;
    padding: 3rem;
    overflow-y: auto;
    position: relative;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

header h2 {
    font-size: 2.2rem;
    font-weight: 600;
}

.date-display {
    font-size: 1rem;
    color: var(--text-dim);
    background: var(--glass-bg);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
}

/* Input Styles */
.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

input[type="text"] {
    flex: 1;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

input[type="text"]:focus {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.1);
}

button#add-task-btn, button#add-routine-btn {
    background: var(--secondary);
    color: #000;
    border: none;
    padding: 0 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

button#add-task-btn:hover, button#add-routine-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(24, 220, 255, 0.4);
}

/* Filters */
.task-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-dim);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn.active {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-main);
    color: var(--text-main);
}

/* Task List Styles */
.task-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.task-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.2rem;
    border-radius: 15px;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
    animation: slideIn 0.3s ease-out;
}

.task-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(5px);
}

.task-item.completed {
    opacity: 0.6;
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--text-dim);
}

.task-checkbox {
    width: 22px;
    height: 22px;
    border: 2px solid var(--primary);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.task-checkbox.checked {
    background: var(--primary);
}

.task-checkbox.checked::after {
    content: '✓';
    color: white;
    font-size: 0.8rem;
}

.task-text {
    flex: 1;
    font-size: 1.05rem;
}

.task-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
}

.task-item:hover .task-actions {
    opacity: 1;
}

.action-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.3rem;
    border-radius: 5px;
}

.action-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
}

.action-btn.delete:hover {
    color: var(--danger);
}

/* Analytics View */
.chart-container {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 20px;
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-dim);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

/* Utility */
.hidden {
    display: none !important;
}

.section-hint {
    margin-bottom: 1rem;
    color: var(--text-dim);
    font-size: 0.9rem;
    font-style: italic;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        padding: 1rem;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
    }
    .logo { margin-bottom: 0; }
    nav { flex-direction: row; }
    .nav-btn { padding: 0.5rem 0.8rem; }
    .nav-btn .icon { margin-right: 0; }
    .nav-btn { font-size: 0; }
    .nav-btn .icon { font-size: 1.2rem; }
    .content { padding: 1.5rem; }
}