body {font-family: 'Poppins', sans-serif; margin: 0; padding: 0; box-sizing: border-box; line-height: 1.6; color: #333; background-color: #f8faff; scroll-behavior: smooth;}

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


.hero {
    background: linear-gradient(rgba(0, 75, 170, 0.7), rgba(0, 75, 170, 0.7)), url('_url_') no-repeat center center/cover;
    color: white;
    text-align: center;
    padding: 120px 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    position: relative;
    overflow: hidden;
}


.hero::before {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg viewBox="0 0 1200 120" preserveAspectRatio="none" xmlns="http://www.w3.org/2000/svg" style="height: 120px; width: 100%;"><path d="M0,0 C300,80 800,-80 1200,0 L1200,120 L0,120 Z" style="fill: %23f8faff;"></path></svg>') no-repeat center bottom;
    background-size: cover;
    z-index: 1;
}


.hero-content {
    z-index: 2;
}

.hero-content h1 {
    font-size: 3.8em;
    margin-bottom: 15px;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 1.4em;
    margin-bottom: 40px;
    max-width: 600px;
    opacity: 0.9;
}

.button {
    display: inline-block;
    background-color: #ff6f61;
    color: white;
    padding: 15px 35px;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    font-weight: 600;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.button:hover {
    background-color: #e65c50;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.section {
    padding: 80px 0;
    text-align: center;
    position: relative;
}

.section:nth-of-type(odd) {
    background-color: #ffffff;
}

.section:nth-of-type(even) {
    background-color: #eef2f7;
}

.section h2 {
    font-size: 3em;
    margin-bottom: 40px;
    color: #004baa;
    position: relative;
    display: inline-block;
}

.section h2::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -10px;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: #ff6f61;
    border-radius: 2px;
}

.about-section p {
    font-size: 1.1em;
    max-width: 800px;
    margin: 0 auto 15px auto;
    color: #555;
    line-height: 1.8;
}

.skills-section p {
    font-size: 1.1em;
    max-width: 800px;
    margin: 0 auto 15px auto;
    color: #555;
    line-height: 1.8;
}

.contact-section {
    background-color: #ffffff;
}

.contact-section p {
    font-size: 1.1em;
    margin-bottom: 30px;
    color: #555;
}

.contact-form {
    background-color: #fff;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    margin: 30px auto;
    text-align: left;
    border: 1px solid #e0e0e0;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #444;
    font-size: 1.05em;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: calc(100% - 24px);
    padding: 12px;
    border: 1px solid #cdd4e0;
    border-radius: 15px;
    font-size: 1em;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25)
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button {
    width: 100%;
    padding: 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.2em;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 10px rgba(0, 123, 255, 0.2);
}

.contact-form button:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 123, 255, 0.3);
}

.form-status {
    margin-top: 20px;
    font-weight: bold;
    font-size: 1.1em;
}

.form-status.success {
    color: #28a745;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 10px;
    border-radius: 5px;
}

.form-status.error {
    color: #dc3545;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 10px;
    border-radius: 5px;
}

footer {
    background-color: #282932;
    color: #FFFFFF;
    text-align: center;
    padding: 5px;
    margin-top: 0px auto;
    font-size: 0.95em;
}

@media (max-width: 768px) {
    .hero {
        padding: 80px 20px;
        min-height: 50vh;
    }
    .hero-content h1 {
        font-size: 2.8em;
    }
    .hero-content p {
        font-size: 1.1em;
    }
    .section {
        padding: 50px 0;
    }
    .section h2 {
        font-size: 2.2em;
    }
    .contact-form {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2em;
    }
    .hero-content p {
        font-size: 1em;
    }
    .button {
        padding: 10px 25px;
        font-size: 0.9em;
    }
    .section h2 {
        font-size: 1.8em;
    }
    .form-group input,
    .form-group textarea,
    .contact-form button {
        font-size: 0.9em;
    }
}

.social-links {
    margin-top: 20px;
    margin-bottom: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.social-links a {
    color: var(--white-text);
    text-decoration: none;
    font-size: 1.2em;
    margin: 0 10px; /* có thể bỏ */
    transition: color 0.3s ease;
    display: inline-flex;
    align-items: center;
}

.social-links a i {
    margin-right: 8px;
    font-size: 1.5em;
}

.social-links a:hover {
    color: var(--primary-color);
}

#background{
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: -1;
}

.main-action-buttons-container {
    background-color: #ffffff;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    border-radius: 10px;
    margin-bottom: 40px;
    position: relative;
    z-index: 2;
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.download-button {
    background-color: #fff;
}

.external-link-button {
    background-color: #004baa;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 75, 170, 0.2);
}

.external-link-button:hover {
    background-color: #003681;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 75, 170, 0.3);
}

@media (max-width: 768px) {
    .action-buttons {
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .main-action-buttons-container {
        padding: 20px 0;
    }
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    .action-buttons .button {
        width: 90%;
        margin-bottom: 10px;
    }
}





/* Thêm vào Contact02.css của bạn nếu nó chưa có */

.form-group select {
    width: calc(100% - 24px); /* Giống với input */
    padding: 12px;
    border: 1px solid #cdd4e0;
    border-radius: 15px; /* Bo tròn góc */
    font-size: 1em;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: white; /* Đảm bảo nền trắng */
    appearance: none; /* Bỏ đi kiểu dáng mặc định của trình duyệt cho select */
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23000%22%20d%3D%22M287%2C197.3L159.2%2C69.5c-3.2-3.2-8.3-3.2-11.6%2C0L5.4%2C197.3c-3.2%2C3.2-3.2%2C8.3%2C0%2C11.6l10.3%2C10.3c3.2%2C3.2%2C8.3%2C3.2%2C11.6%2C0l120.4-120.4l120.4%2C120.4c3.2%2C3.2%2C8.3%2C3.2%2C11.6%2C0l10.3-10.3C290.2%2C205.6%2C290.2%2C200.5%2C287%2C197.3z%22%2F%3E%3C%2Fsvg%3E'); /* Icon mũi tên xuống */
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 12px;
}

.form-group select:focus {
    border-color: #007bff; /* Viền xanh khi focus */
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25); /* Hiệu ứng bóng */
}