/*
* =========================================================================
* style.css - Global Styles for Vinaenter Website
* =========================================================================
*
* Chứa các biến CSS (Custom Properties) cho màu sắc, font chữ, v.v.
* Định nghĩa chế độ Dark Mode.
* Các style cơ bản cho body, headings, typography.
* Style cho Navbar, Hero section, Buttons.
* Style cho Course Cards, Announcements, Why Us.
* Style cho Video Testimonials, Press Logos, Testimonials.
* Style cho Final CTA, Footer.
* Các điều chỉnh Responsive.
*
*/

:root {
    /* Colors - Màu sắc thương hiệu Vinaenter */
    --primary-color: #b50003;
    --primary-color-rgb: 181, 0, 3;
    --primary-hover-color: #9a0003;
    --pro-color: #FFD700; /* Gold color for PRO items */
    --dark-color: #1A1A1A; /* Adjusted for better contrast in light mode */
    --light-color: #f8f9fa; /* A subtle light background */

    /* Light Mode Variables - Biến màu cho chế độ sáng */
    --text-color-light-mode: #1A1A1A;
    --bg-color-light-mode: #FFFFFF;
    --border-color-light-mode: #EAEAEA;
    --control-section-bg-light-mode: #f8f9fa;
    --secondary-color-light-mode: #6c757d;
    --button-light-bg-light-mode: #f0f0f0;
    --button-light-border-light-mode: #e0e0e0;
    --card-shadow-light-mode: rgba(0,0,0,0.06);

    /* Dark Mode Variables - Biến màu cho chế độ tối */
    --text-color-dark-mode: #e0e0e0;
    --bg-color-dark-mode: #212529; /* Darker background for more contrast */
    --border-color-dark-mode: #444; /* Slightly lighter border */
    --control-section-bg-dark-mode: #343a40; /* Darker control section */
    --secondary-color-dark-mode: #a0a0a0;
    --button-light-bg-dark-mode: #555;
    --button-light-border-dark-mode: #666;
    --card-shadow-dark-mode: rgba(0,0,0,0.3);

    /* Current Theme Variables (Dynamic) - Biến màu hiện tại (thay đổi theo chế độ) */
    --current-text-color: var(--text-color-light-mode);
    --current-bg-color: var(--bg-color-light-mode);
    --current-border-color: var(--border-color-light-mode);
    --current-control-section-bg: var(--control-section-bg-light-mode);
    --current-secondary-color: var(--secondary-color-light-mode);
    --current-button-light-bg: var(--button-light-bg-light-mode);
    --current-button-light-border: var(--button-light-border-light-mode);
    --current-card-shadow: var(--card-shadow-light-mode);

    /* Typography - Kiểu chữ */
    --font-family: 'Be Vietnam Pro', sans-serif;
    --heading-font-weight: 700; /* Consistent heading weight */
    
    /* Spacing & Sizing - Biến cho khoảng cách và kích thước */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --border-radius-sm: 0.5rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 12px;
}

/* Dark Mode Toggle Logic - Logic chuyển đổi Dark Mode */
body.dark-mode {
    --current-text-color: var(--text-color-dark-mode);
    --current-bg-color: var(--bg-color-dark-mode);
    --current-border-color: var(--border-color-dark-mode);
    --current-control-section-bg: var(--control-section-bg-dark-mode);
    --current-secondary-color: var(--secondary-color-dark-mode);
    --current-button-light-bg: var(--button-light-bg-dark-mode);
    --current-button-light-border: var(--button-light-border-dark-mode);
    --current-card-shadow: var(--card-shadow-dark-mode);
}

/* Scroll lock and overlay when navbar is open on mobile */
body.no-scroll {
    overflow: hidden;
    position: relative;
}

body.no-scroll::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Lớp phủ mờ */
    z-index: 999; /* Thấp hơn navbar-collapse (z-index mặc định của Bootstrap là 1000) */
    transition: opacity 0.3s ease;
    opacity: 0;
    pointer-events: none; /* Không cho phép tương tác với overlay */
}

body.no-scroll.navbar-open::before {
    opacity: 1; /* Hiển thị overlay khi menu mở */
}

.logo-dark {
    display: none;
}

body.dark-mode .logo-light {
    display: none;
}
body.dark-mode .logo-dark {
    display: block;
}

/* Navbar Collapse on mobile */
.navbar-collapse.show {
    max-height: 100vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch; /* Improved scrolling on iOS */
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: var(--primary-color) var(--current-border-color);
    z-index: 1000; /* Ensure menu is above overlay */
}
.panel-logo,
.navbar-brand img {
    max-width: 100%;
    filter: none;
    transition: filter 0.3s ease; /* Thêm chuyển động mượt mà khi đổi chế độ */
}
.btn-mobile-dp {display:none;}

body.dark-mode .navbar-toggler {
    background-color: var(--dark-mode-button-bg, #3a3b3c); /* Màu nền nút toggler trong dark mode */
    border-color: var(--dark-mode-border-color, #4f5052); /* Màu viền nút toggler trong dark mode */
}

body.dark-mode .darkModeToggle {
	color: var(--light-color);
	border: var(--bs-border-width) solid var(--bs-navbar-toggler-border-color);
    border-radius: var(--bs-navbar-toggler-border-radius);
    transition: var(--bs-navbar-toggler-transition);
    background-color: var(--dark-mode-button-bg, #3a3b3c);
    border-color: var(--dark-mode-border-color, #4f5052);
}

body.dark-mode .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28228, 230, 235, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.proUpgradeBtn {
    background: #ffc107;
    color: #000 !important;
    margin-right: 10px;
    padding: 3px 10px;
}
.proUpgradeBtn:hover {
	color: var(--primary-color) !important;
	background: #ffc107;
}

@media (max-width: 991.98px) and (orientation: portrait) {
	#navbarNav .dashboard-nav {display: none;}
	.pro-mobile-btn {
        padding: 0.2rem 0.5rem;
        margin-right: 7px;
    }
	.navbar-toggler {
        padding: 0.25rem 0.5rem; 
        font-size: 0.875rem; 
        line-height: 1; /* Cố định line-height */
	    box-shadow: none !important;
    }

    .navbar-toggler-icon {
        width: 1.5em; /* Giảm kích thước icon */
        height: 1.5em; /* Giảm kích thước icon */
    }
}

.lesson-main-details.show {
    display: block !important; 
}
/* Custom scrollbar for Webkit (Chrome, Safari) */
.navbar-collapse.show::-webkit-scrollbar {
    width: 8px;
}

#darkModeToggle {margin-left: 8px;}

.navbar-collapse.show::-webkit-scrollbar-track {
    background: var(--current-border-color);
    border-radius: 10px;
}

.navbar-collapse.show::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 10px;
    border: 2px solid var(--current-border-color);
}

/* Base Styles - Các style cơ bản cho toàn trang */
body {
    font-family: var(--font-family);
    line-height: 1.6; /* Slightly reduced for better readability */
    background-color: var(--current-bg-color);
    color: var(--current-text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    font-smoothing: antialiased; /* Better font rendering */
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--heading-font-weight);
    color: var(--current-text-color);
    transition: color 0.3s ease;
}

p {
    color: var(--current-secondary-color); /* Use secondary color for paragraphs */
}

/* Utility Classes - Các lớp tiện ích */
.section-padding { padding: 80px 0; }
.section-title { margin-bottom: 60px; text-align: center; }
.section-title h2 {
    position: relative;
    padding-bottom: 15px;
}
.section-title h2::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

/* Navbar - Thanh điều hướng */
.navbar {
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--current-bg-color);
}
.navbar-light .navbar-nav .nav-link {
    color: var(--current-text-color);
    font-weight: 500;
    transition: color 0.3s ease;
    padding: var(--spacing-xs) var(--spacing-sm); /* Adjust padding for better spacing */
}
.navbar-light .navbar-nav .nav-link:hover,
.navbar-light .navbar-nav .nav-link.active {
    color: var(--primary-color);
}
.navbar-brand img { 
    height: 45px; 
    transition: height 0.3s ease; 
}
@media (max-width: 991.98px) {
    .navbar-brand img { height: 35px; } /* Smaller logo on mobile */
    .navbar-toggler { border-color: var(--current-border-color); }
    .navbar-collapse {
        background-color: var(--current-bg-color);
        border-top: 1px solid var(--current-border-color);
        padding: var(--spacing-sm) 0;
    }
    .nav-item { margin-bottom: var(--spacing-xs); }
}

.dropdown-menu {
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--current-border-color);
    box-shadow: 0 0.5rem 1rem var(--current-card-shadow);
    background-color: var(--current-bg-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.dropdown-item {
    color: var(--current-text-color);
    padding: 0.75rem 1.25rem; /* More generous padding */
    transition: background-color 0.2s ease, color 0.2s ease;
}
.dropdown-item:hover {
    background-color: var(--current-button-light-bg);
    color: var(--primary-color);
}
@media (min-width: 992px) {
    .navbar .nav-item.dropdown:hover .dropdown-menu { display: block; margin-top: 0; }
}

/* Hero Section - Khu vực Hero (trang chủ) */
#hero {
    position: relative;
    overflow: hidden;
    color: white;
    min-height: 80vh; /* Use min-height for better adaptability */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 0; /* Add vertical padding */
}
#hero video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    z-index: 0;
    filter: brightness(0.7); /* Slightly dim video for better text contrast */
}
#hero .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1;
}
#hero .container { position: relative; z-index: 2; }
#hero h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem); /* Responsive font size */
    font-weight: var(--heading-font-weight);
    margin-bottom: 1rem;
}
#hero p {
    font-size: clamp(1rem, 2vw, 1.25rem); /* Responsive font size */
    max-width: 700px;
    margin: 20px auto;
    color: rgba(255, 255, 255, 0.9);
}

/* Buttons - Nút bấm */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.75rem 1.5rem; /* Standardized padding */
    font-weight: 600;
    border-radius: var(--border-radius-sm); /* Slightly more rounded */
    transition: all 0.2s ease-in-out;
}
.btn-primary:hover {
    background-color: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
    transform: translateY(-2px); /* Subtle hover effect */
    color: var(--light-color);
}
.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease-in-out;
}
.btn-outline-primary:hover {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Course Cards - Thẻ khóa học */
.course-card {
    background-color: var(--current-bg-color);
    border: 1px solid var(--current-border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: 0 5px 15px var(--current-card-shadow);
}
.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px var(--current-card-shadow);
    border-color: var(--primary-color);
}
.course-card-img-top {
    height: 200px; /* Fixed height for consistent image size */
    object-fit: cover;
    width: 100%;
}
.course-card-body {
    padding: 25px;
    display: flex;
    flex-direction: column;
    flex-grow: 1; /* Allows body to take remaining space */
}
.course-card-title {
    font-weight: 600;
    color: var(--current-text-color);
    margin-bottom: 10px;
    font-size: 1.25rem; /* Slightly larger title */
}
.course-price {
    margin: 15px 0;
    display: flex;
    align-items: baseline;
    gap: 10px;
    flex-wrap: wrap; /* Allow prices to wrap on small screens */
}
.course-price .sale-price {
    font-size: 1.75rem; /* More prominent sale price */
    font-weight: var(--heading-font-weight);
    color: var(--primary-color);
}
.course-price .original-price {
    font-size: 1.1rem;
    color: var(--current-secondary-color);
    text-decoration: line-through;
}
.course-metadata {
    display: flex;
    gap: 20px;
    color: var(--current-secondary-color);
    font-size: 0.9rem;
    margin-bottom: 15px;
    flex-wrap: wrap; /* Allow metadata to wrap */
}
.course-metadata .meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
}
.course-card-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    margin-top: auto;
    display: inline-flex; /* Align icon and text */
    align-items: center;
    gap: 5px;
}
.course-card-link .arrow {
    transition: transform 0.3s ease;
    display: inline-block;
}
.course-card:hover .course-card-link .arrow { 
    transform: translateX(5px); 
}

/* Announcements Section - Khu vực thông báo */
#announcements {
    background-color: var(--current-bg-color);
    transition: background-color 0.3s ease;
}
.announcement-card {
    background: var(--current-bg-color);
    border-radius: 8px;
    border: 1px solid var(--current-border-color);
    padding: 20px; /* Increased padding */
    transition: all 0.3s ease;
    color: var(--current-text-color);
    display: flex;
    align-items: center;
    box-shadow: 0 3px 10px var(--current-card-shadow);
}
.announcement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--current-card-shadow);
}
.announcement-card img {
    width: 70px; /* Slightly larger image */
    height: 70px;
    border-radius: 8px;
    object-fit: cover;
    margin-right: 15px;
    flex-shrink: 0; /* Prevent image from shrinking */
}
.announcement-card .badge {
    font-weight: 600; /* Bolder badge text */
    margin-bottom: 5px;
}
.announcement-card h5 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}
.announcement-card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}
@media (max-width: 575.98px) {
    .announcement-card {
        flex-direction: column;
        text-align: center;
    }
    .announcement-card img {
        margin-right: 0;
        margin-bottom: 10px;
    }
}

/* Why Us Section - Khu vực "Tại sao chọn chúng tôi" */
#why-us {
    background-image: linear-gradient(180deg, var(--current-bg-color) 0%, var(--light-color) 100%);
    transition: background-image 0.3s ease, background-color 0.3s ease;
}
body.dark-mode #why-us {
    background-image: linear-gradient(180deg, var(--current-bg-color) 0%, rgba(52, 58, 64, 0.5) 100%); /* Adjusted dark mode gradient */
}
/*
============================================
=== Dark Mode Styles for Lesson Details & Tabs ===
============================================
*/

body.dark-mode .nav-tabs {
    border-color: var(--dark-mode-border-color, #4f5052); /* Sử dụng biến hoặc màu cụ thể cho border */
}

body.dark-mode .nav-tabs .nav-link {
    color: var(--dark-mode-text-muted, #b0b3b8); /* Màu chữ mặc định cho link tab */
}

body.dark-mode .nav-tabs .nav-link:hover {
    color: var(--primary-color); /* Giữ màu nhấn khi hover */
    border-color: var(--primary-color);
}

body.dark-mode .nav-tabs .nav-link.active {
    color: var(--primary-color); /* Giữ màu nhấn cho tab active */
    border-color: var(--primary-color);
    background-color: transparent; /* Đảm bảo không có nền trắng */
}

body.dark-mode .tab-content {
    background-color: var(--dark-mode-bg-secondary, #242526); /* Nền cho nội dung tab */
    border-color: var(--dark-mode-border-color, #4f5052);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4); /* Điều chỉnh shadow cho dark mode */
}

body.dark-mode .tab-pane p {
    color: var(--dark-mode-text-color, #e4e6eb); /* Màu chữ cho nội dung tab */
}

body.dark-mode .tab-pane p.text-muted {
    color: var(--dark-mode-text-muted, #b0b3b8) !important; /* Màu chữ muted trong dark mode */
}
#why-us .icon {
    font-size: 55px; /* Slightly larger icon */
    margin-bottom: 20px;
    color: var(--primary-color);
    transition: color 0.3s ease;
}
#why-us h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}
#why-us p {
    font-size: 1rem;
}

/* Video Testimonials Section - Khu vực đánh giá video */
#video-testimonials {
    background-color: var(--current-bg-color);
    transition: background-color 0.3s ease;
}
.video-testimonial-slider .swiper-slide {
    padding: var(--spacing-sm); /* Padding for slide content */
}
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 25px var(--current-card-shadow);
}
.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
.video-testimonial-slider .swiper-button-next,
.video-testimonial-slider .swiper-button-prev {
    color: var(--primary-color);
    background-color: rgba(255, 255, 255, 0.9); /* More opaque */
    border-radius: 50%;
    width: 50px; /* Larger buttons */
    height: 50px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}
body.dark-mode .video-testimonial-slider .swiper-button-next,
body.dark-mode .video-testimonial-slider .swiper-button-prev {
    background-color: rgba(0, 0, 0, 0.5); /* Darker in dark mode */
}
.video-testimonial-slider .swiper-button-next:hover,
.video-testimonial-slider .swiper-button-prev:hover {
    background-color: #fff;
    transform: scale(1.05);
}
body.dark-mode .video-testimonial-slider .swiper-button-next:hover,
body.dark-mode .video-testimonial-slider .swiper-button-prev:hover {
    background-color: rgba(0, 0, 0, 0.7);
}
.video-testimonial-slider .swiper-button-next::after,
.video-testimonial-slider .swiper-button-prev::after {
    font-size: var(--spacing-md); /* Larger icon in buttons */
    font-weight: 700;
}
.video-testimonial-slider .swiper-pagination-bullet-active {
    background-color: var(--primary-color);
}

/* Press Logos Section - Khu vực logo báo chí */
.press-slider .press-logo {
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all 0.4s ease;
    max-width: 150px; /* Slightly larger logo size */
    height: auto;
    display: block; /* Ensures centering */
    margin: 0 auto; /* Center logos */
}
.press-slider .press-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
    transform: scale(1.05); /* Slight scale on hover */
}

/* Testimonials Section - Khu vực đánh giá học viên */
#testimonials {
    background-image: linear-gradient(180deg, var(--current-bg-color) 0%, var(--light-color) 100%);
    transition: background-image 0.3s ease, background-color 0.3s ease;
}
body.dark-mode #testimonials {
    background-image: linear-gradient(180deg, var(--current-bg-color) 0%, rgba(52, 58, 64, 0.5) 100%);
}
.testimonial-card {
    background: var(--current-bg-color);
    padding: 30px;
    border-radius: var(--border-radius-lg); /* More rounded corners */
    border: 1px solid var(--current-border-color);
    text-align: center;
    height: 100%;
    color: var(--current-text-color);
    box-shadow: 0 5px 15px var(--current-card-shadow);
    transition: all 0.3s ease;
}
.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--current-card-shadow);
}
.testimonial-card img {
    width: 100px; /* Larger avatar */
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 20px;
    object-fit: cover;
    border: 4px solid var(--primary-color);
}
.testimonial-card p {
    font-size: 1.05rem;
    font-style: italic;
    margin-bottom: 15px;
}
.testimonial-card h5 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}
.testimonial-card span {
    font-size: 0.9rem;
    color: var(--current-secondary-color);
}

/* Final CTA Section - Khu vực kêu gọi hành động cuối trang */
#final-cta {
    position: relative;
    background: url('https://picsum.photos/1920/1080?random=20') no-repeat center center/cover;
    color: #fff;
    padding: 100px 0; /* More padding */
}
#final-cta::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(26, 26, 26, 0.85); /* Slightly darker overlay */
}
#final-cta .container { position: relative; z-index: 2; }
#final-cta h2 {
    font-weight: var(--heading-font-weight);
    font-size: clamp(2rem, 4vw, 3rem); /* Responsive font size */
    margin-bottom: var(--spacing-md);
}
#final-cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}
#final-cta .benefit-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 2rem;
}
#final-cta .benefit-list li {
    margin-bottom: 12px;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
}
#final-cta .benefit-list .fa-check-circle {
    color: var(--primary-color);
    margin-right: 10px;
    font-size: 1.2em;
}

/* Footer - Chân trang */
footer {
    background-color: var(--dark-color);
    color: rgba(255,255,255,0.75); /* Slightly brighter text */
    padding-top: 60px; /* Consistent padding */
    padding-bottom: 30px;
    font-size: 0.95rem;
}
footer h5 {
    color: #fff;
    font-weight: var(--heading-font-weight);
    margin-bottom: 20px;
    font-size: 1.2rem;
}
footer p {
    margin-bottom: 15px;
    line-height: 1.8;
}
footer a {
    color: rgba(255,255,255,0.9); /* Brighter links */
    text-decoration: none;
    transition: color 0.3s;
}
footer a:hover { color: var(--primary-color); }
footer .list-unstyled li { margin-bottom: 10px; }
footer .list-unstyled li i { margin-right: 10px; color: var(--primary-color); }
footer .social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.1);
    color: #fff;
    font-size: 1.1rem;
    margin-right: 10px;
    transition: background-color 0.3s, color 0.3s;
}
footer .social-icons a:hover {
    background-color: var(--primary-color);
    color: #fff;
}
footer hr { border-color: rgba(255,255,255,0.15); margin-top: 40px; margin-bottom: 30px; }
footer .text-center { font-size: 0.9rem; }

/* Responsive Adjustments - Điều chỉnh cho các màn hình khác nhau */
@media (max-width: 1200px) {
    .section-padding { padding: 60px 0; }
    .section-title { margin-bottom: 40px; }
    #hero h1 { font-size: clamp(2rem, 5vw, 4rem); }
    #hero p { font-size: clamp(0.9rem, 2vw, 1.1rem); }
}

@media (max-width: 991.98px) {
    .section-padding { padding: 50px 0; padding-top: 30px !important;}
    .section-title { margin-bottom: 30px; }
    .btn-mobile-dp {display:block;}
}

@media (max-width: 767.98px) {
    body { padding-top: 60px; }
    .section-padding { padding: 40px 0; }
    .section-title h2 { font-size: 1.8rem; }
    #hero h1 { font-size: clamp(1.8rem, 6vw, 3rem); }
    #hero p { font-size: 0.9rem; }
    .course-card-body { padding: 20px; }
    .course-card-title { font-size: 1.1rem; }
    .course-price .sale-price { font-size: 1.5rem; }
    .course-price .original-price { font-size: 1rem; }
    .announcement-card { padding: 15px; }
    .announcement-card img { width: 60px; height: 60px; }
    #final-cta { padding: 60px 0; }
    #final-cta h2 { font-size: clamp(1.5rem, 5vw, 2.5rem); }
    #final-cta .benefit-list li { font-size: 0.95rem; }
    footer { padding-top: 40px; }
    footer h5 { font-size: 1.1rem; margin-bottom: 15px; }
    footer .social-icons a { width: 35px; height: 35px; font-size: 1rem; }
}

@media (max-width: 575.98px) {
    .navbar-brand img { height: 30px; }
}

.form-switch .form-check-input {
    width: 2.5em;
    height: 1.25em;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccirclet r='3' fill='rgba%280, 0, 0, 0.25%29'/%3e%3c/svg%3e");
    background-position: left center;
    border-radius: 1.25em;
    transition: background-position .15s ease-in-out;
}
.form-switch .form-check-input:focus {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccirclet r='3' fill='%23636363'/%3e%3c/svg%3e");
}
.form-switch .form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}
.form-switch .form-check-input:checked:focus {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccirclet r='3' fill='%23fff'/%3e%3c/svg%3e");
}
.form-switch .form-check-input:not(:checked) {
    background-color: var(--current-border-color);
}

body.dark-mode .form-switch .form-check-input:not(:checked) {
    background-color: var(--current-secondary-color);
}