:root {
    --primary: #DA251D; /* Rouge du drapeau vietnamien */
    --secondary: #FFCD00; /* Jaune du drapeau */
    --accent: #001489; /* Bleu foncé */
    --light-bg: #FFF5F5;
    --dark-text: #333333;
}

body {
    font-family: 'Segoe UI', 'Noto Sans', sans-serif;
    line-height: 1.8;
    color: var(--dark-text);
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #ffffff;
}

h1 {
    color: var(--primary);
    font-size: 2.5rem;
    text-align: center;
    border-bottom: 3px solid var(--secondary);
    padding-bottom: 15px;
    margin: 30px 0;
}

h2 {
    color: var(--accent);
    font-size: 2rem;
    margin-top: 50px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
}

h3 {
    color: var(--primary);
    font-size: 1.6rem;
    margin-top: 40px;
}

.hero-image {
    width: 100%;
    height: 450px;
    object-fit: cover;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.cultural-insight {
    background-color: var(--light-bg);
    border-left: 5px solid var(--primary);
    padding: 25px;
    margin: 35px 0;
    border-radius: 0 12px 12px 0;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 2.8rem;
    color: var(--primary);
    font-weight: bold;
    margin-bottom: 10px;
}

.app-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.app-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-top: 4px solid var(--accent);
}

.do-dont-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 45px 0;
}

.do-box {
    background-color: #f0fff4;
    padding: 25px;
    border-radius: 10px;
    border-left: 5px solid #4CAF50;
}

.avoid-box {
    background-color: #fff0f0;
    padding: 25px;
    border-radius: 10px;
    border-left: 5px solid var(--primary);
}

.city-guide {
    background: linear-gradient(135deg, var(--accent), #000A5E);
    color: white;
    padding: 40px;
    border-radius: 15px;
    margin: 60px 0;
}

.testimonial {
    font-style: italic;
    padding: 30px;
    border-left: 5px solid var(--secondary);
    margin: 50px 0;
    background: var(--light-bg);
    border-radius: 0 15px 15px 0;
}

.dating-timeline {
    margin: 50px 0;
    position: relative;
    padding-left: 30px;
}

.timeline-item {
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:before {
    content: "";
    position: absolute;
    left: -30px;
    top: 5px;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--primary);
}

.timeline-connector {
    position: absolute;
    left: -23px;
    top: 20px;
    bottom: -25px;
    width: 2px;
    background: var(--primary);
}

.cta-section {
    background: linear-gradient(135deg, var(--primary), #B0201A);
    color: white;
    padding: 50px;
    text-align: center;
    border-radius: 15px;
    margin: 70px 0;
}

@media (max-width: 700px) {
    .do-dont-container {
        grid-template-columns: 1fr;
    }
}