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

body {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: white;
    text-align: center;
    min-height: 100vh;
}

header {
    padding: 20px;
    font-size: 28px;
    font-weight: bold;
    letter-spacing: 1px;
}

.container {
    max-width: 600px;
    margin: auto;
    padding: 20px;
}

.section {
    background: rgba(255, 255, 255, 0.05);
    margin: 20px 0;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.timer {
    font-size: 56px;
    margin: 20px 0;
    font-weight: bold;
}

button {
    padding: 10px 18px;
    margin: 6px;
    border: none;
    border-radius: 8px;
    background: #38bdf8;
    color: black;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #0ea5e9;
    transform: scale(1.05);
}

input {
    padding: 10px;
    width: 65%;
    border-radius: 8px;
    border: none;
    margin-right: 8px;
}

ul {
    list-style: none;
    padding: 0;
    margin-top: 15px;
}

li {
    background: #1e293b;
    margin: 8px 0;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
}

li:hover {
    background: #334155;
}

li button {
    background: #ef4444;
    color: white;
    padding: 5px 10px;
    font-size: 12px;
}

li button:hover {
    background: #dc2626;
}