/* Modern Dark Theme - Todo App Vue.js */

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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #707070;
    --accent: #ffffff;
    --border: #333333;
    --success: #4ade80;
    --danger: #f87171;
    --warning: #fbbf24;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1a2e 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-info {
    color: var(--text-secondary);
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: var(--text-secondary);
    transform: translateY(-2px);
}

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

.btn-danger {
    background: var(--danger);
    color: white;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

/* Auth Page */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}

.auth-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 3rem;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header i {
    font-size: 4rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.auth-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

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

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.tab {
    flex: 1;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

.tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

/* Main App */
.app-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 2rem;
}

.app-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Todo Input */
.todo-input-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.todo-input-wrapper {
    display: flex;
    gap: 1rem;
}

.todo-input-wrapper input {
    flex: 1;
    padding: 1rem 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.todo-input-wrapper input:focus {
    outline: none;
    border-color: var(--text-primary);
}

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
}

.filter-btn {
    flex: 1;
    padding: 0.75rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn.active {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

/* Todo List */
.todo-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.todo-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s;
    animation: slideIn 0.3s ease-out;
}

.todo-item:hover {
    border-color: var(--text-primary);
    transform: translateX(4px);
}

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

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

.checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--text-primary);
}

.todo-content {
    flex: 1;
}

.todo-title {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.todo-title.completed {
    text-decoration: line-through;
    color: var(--text-muted);
}

.todo-date {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.todo-actions {
    display: flex;
    gap: 0.5rem;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    color: var(--text-primary);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    transform: scale(1.1);
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.stat-card h3 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 5rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Alert */
.alert {
    position: fixed;
    top: 5rem;
    right: 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.alert-success {
    border-color: var(--success);
}

.alert-error {
    border-color: var(--danger);
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }
    
    .todo-input-wrapper {
        flex-direction: column;
    }
    
    .filters {
        flex-direction: column;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .alert {
        right: 1rem;
        left: 1rem;
    }
}