:root {
    --primary: #3b82f6;
    --primary-glow: rgba(59, 130, 246, 0.5);
    --secondary: #10b981;
    --bg-dark: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
    --danger: #ef4444;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

/* Background Animated Blobs */
.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: move 20s infinite alternate;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: var(--primary);
    top: -100px;
    right: -100px;
}

.blob-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary);
    bottom: -50px;
    left: -50px;
    animation-delay: -5s;
}

.blob-3 {
    width: 250px;
    height: 250px;
    background: #8b5cf6;
    top: 40%;
    left: 40%;
    animation-delay: -10s;
}

@keyframes move {
    from { transform: translate(0, 0) scale(1); }
    to { transform: translate(50px, 100px) scale(1.1); }
}

/* Main Container */
.app-container {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    margin: 1rem;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -1px;
}

header h1 span {
    color: var(--primary);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Input Section */
.input-section form {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

#task-input {
    flex: 1;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    border-radius: 14px;
    color: white;
    outline: none;
    transition: all 0.3s ease;
}

#task-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

#add-btn {
    background: var(--primary);
    border: none;
    width: 54px;
    height: 54px;
    border-radius: 14px;
    color: white;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, background 0.2s ease;
}

#add-btn:hover {
    transform: scale(1.05);
    background: #2563eb;
}

/* Stats Section */
.stats-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--glass-border);
}

.stat-card span {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
}

.stat-card label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Task List */
#task-list {
    list-style: none;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 5px;
}

#task-list::-webkit-scrollbar {
    width: 6px;
}

#task-list::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}

.task-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 14px;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid transparent;
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease-out forwards;
}

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

.task-item:hover {
    border-color: var(--glass-border);
    background: rgba(255, 255, 255, 0.08);
}

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

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

.custom-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary);
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
}

.task-item.completed .custom-checkbox {
    background: var(--primary);
}

.task-item span {
    flex: 1;
    font-size: 0.95rem;
}

.delete-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 5px;
    transition: color 0.2s;
}

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