html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
  color: var(--bs-secondary-color);
  text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
  text-align: start;
}

/* Nền cho phần Hero (Phần đầu trang) */
.hero-section {
    background: linear-gradient(135deg, #f0f4f8 0%, #d9e2ec 100%);
    overflow: hidden;
}

/* Hiệu ứng 3D cho ảnh giao diện phần mềm */
.software-mockup {
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform 0.5s ease, box-shadow 0.5s ease;
    border: 1px solid #e1e4e8;
}

    .software-mockup:hover {
        transform: perspective(1000px) rotateY(0deg) rotateX(0deg) translateY(-5px);
        box-shadow: 0 30px 50px rgba(0, 0, 0, 0.2);
    }

/* Hiệu ứng nổi lên cho các thẻ tính năng */
.feature-card {
    transition: all 0.3s ease;
    border: 1px solid #eaeaea;
    background: #ffffff;
}

    .feature-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0,0,0,0.08);
        border-color: #0d6efd;
    }

/* Nền cho section gọi hành động (CTA) */
.cta-section {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
}

/* Nền Hero Section */
.hero-section {
    background: linear-gradient(135deg, #f0f4f8 0%, #d9e2ec 100%);
    overflow: hidden;
}

/* Hiệu ứng ảnh phần mềm */
.software-mockup {
    border-radius: 8px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    border: 1px solid #dee2e6;
    transition: transform 0.3s ease;
}

    .software-mockup:hover {
        transform: translateY(-5px);
    }

/* --- TÙY CHỈNH CHO PHẦN TƯƠNG TÁC TÍNH NĂNG (INTERACTIVE TABS) --- */
.feature-tab-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 20px;
    border-radius: 12px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    background: #f8f9fa;
    margin-bottom: 15px;
    color: #495057;
    cursor: pointer;
    text-decoration: none;
}

    .feature-tab-btn:hover:not(.active) {
        background: #e2e6ea;
    }

    /* Khi người dùng click chọn tính năng */
    .feature-tab-btn.active {
        background: #ffffff;
        border-color: #0d6efd;
        box-shadow: 0 10px 25px rgba(13, 110, 253, 0.15);
        color: #0d6efd;
    }

        .feature-tab-btn.active h5 {
            color: #0d6efd;
            font-weight: bold;
        }

    .feature-tab-btn h5 {
        font-size: 1.1rem;
        margin-bottom: 5px;
        color: #212529;
    }

    .feature-tab-btn p {
        margin-bottom: 0;
        font-size: 0.9rem;
        opacity: 0.8;
    }

/* Hiệu ứng mờ dần khi chuyển Tab */
.tab-pane {
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}