/* style.css - Định dạng chung cho các trang đề bài (debai{n}.html) */

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #74b9ff 0%, #a29bfe 100%);
    margin: 0;
    padding: 40px 20px;
    color: #2d3436;
    min-height: 100vh;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    padding: 50px;
    border-radius: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    border: 5px solid white;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    color: #ff7675;
    font-size: 36px;
    margin: 0 0 10px 0;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-bottom: 4px dashed #ff7675;
    display: inline-block;
    padding-bottom: 10px;
}

.description {
    font-size: 18px;
    line-height: 1.8;
    color: #636e72;
    background: #f1f2f6;
    padding: 20px;
    border-radius: 15px;
    border-left: 8px solid #ff7675;
    margin-bottom: 30px;
}

h2 {
    color: #6c5ce7;
    font-size: 24px;
    margin-top: 40px;
    display: flex;
    align-items: center;
}

h2::before {
    content: '🌟';
    margin-right: 10px;
}

.knowledge-section {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
}

.tag {
    background: #e1f5fe;
    color: #0288d1;
    padding: 8px 15px;
    border-radius: 50px;
    font-weight: bold;
    font-size: 14px;
    border: 1px solid #b3e5fc;
}

.steps-box {
    background: white;
    border: 2px solid #fab1a0;
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 30px;
}

.step-item {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.step-item:last-child {
    border-bottom: none;
}

.step-title {
    font-weight: bold;
    color: #e17055;
    display: block;
    font-size: 18px;
    margin-bottom: 8px;
}

.code-snippet {
    background: #2d3436;
    color: #fab1a0;
    padding: 25px;
    border-radius: 15px;
    overflow-x: auto;
    font-family: 'Consolas', monospace;
    font-size: 15px;
    border: 4px solid #636e72;
    margin-top: 15px;
}

pre {
    margin: 0;
}

.tip-box {
    background: #fff9db;
    border-left: 10px solid #fcc419;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
    font-style: italic;
}