/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700&display=swap');

/* Reset và cài đặt chung */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    background-color: #f4f7f6;
    color: #333;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
}

h1, h2, h3 {
    color: #1a1a1a;
    font-weight: 600;
}

a {
    text-decoration: none;
    color: #4a90e2;
}

/* Header */
.header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a1a1a;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #4a90e2;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(to right, #4a90e2, #7ed6df);
    color: #fff;
    text-align: center;
    padding: 100px 20px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    margin: auto;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: #fff;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background-color: #fff;
    color: #4a90e2;
    padding: 12px 25px;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Section chung */
section {
    padding: 60px 0;
    text-align: center;
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
}

section h2::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 4px;
    background-color: #4a90e2;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

/* About Section */
.about-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
    text-align: left;
    max-width: 900px;
    margin: auto;
}

.about-content img {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.about-content p {
    flex: 1;
    font-size: 1.1rem;
}

/* Portfolio Section */
.portfolio-section {
    background-color: #f0f3f6;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.project-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-info {
    padding: 25px;
}

.project-info h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.project-info p {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.project-link {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 5px;
}

.project-link i {
    transition: transform 0.3s ease;
}

.project-link:hover i {
    transform: translateX(5px);
}

/* Contact Section */
.contact-section {
    background-color: #fff;
}

.contact-info {
    font-size: 1.1rem;
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.contact-info i {
    color: #4a90e2;
    margin-right: 10px;
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: #aaa;
    text-align: center;
    padding: 20px 0;
}