/* =========================================
   VARIABLES & SETUP (BRAND IDENTITY)
========================================= */
:root {
    /* Background Colors */
    --bg-dark: #0B132B;
    --bg-card: rgba(28, 37, 65, 0.65);
    --bg-card-hover: rgba(35, 46, 78, 0.85);
    
    /* Text Colors */
    --text-primary: #F8F9FA;
    --text-secondary: #A0AAB2;
    
    /* Accent Colors */
    --accent-blue: #00F0FF;
    --accent-blue-dim: rgba(0, 240, 255, 0.15);
    --accent-gold: #D4AF37;
    --accent-gold-dim: rgba(212, 175, 55, 0.15);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--accent-blue) 0%, #0077B6 100%);
    --gradient-gold: linear-gradient(135deg, var(--accent-gold) 0%, #FBBF24 100%);
    
    /* Shadows */
    --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.25);
    --shadow-card: 0 10px 40px -10px rgba(0, 0, 0, 0.6);
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Roboto', sans-serif;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================================
   BUTTONS
========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px var(--accent-blue-dim);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(0, 240, 255, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
}

.btn-outline:hover {
    background: var(--accent-blue-dim);
    box-shadow: var(--shadow-glow);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* =========================================
   NAVBAR
========================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    padding: 15px 0;
    background: rgba(7, 11, 20, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Roboto', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: #fff;
}

.logo-highlight {
    color: var(--accent-blue);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    font-size: 1rem;
    color: var(--text-secondary);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-normal);
}

.nav-links a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* =========================================
   HERO SECTION
========================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    z-index: 10;
}

.badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent-blue-dim);
    color: var(--accent-blue);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid rgba(0, 240, 255, 0.3);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 90%;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.expert-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 20px;
    box-shadow: var(--shadow-card);
    position: relative;
    z-index: 2;
    text-align: center;
    width: 100%;
    max-width: 350px;
    animation: float 6s ease-in-out infinite;
}

.expert-image-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 20px;
}

.expert-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}

.glow-ring {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: 16px;
    box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.3);
    pointer-events: none;
}

.expert-info h3 {
    font-size: 1.4rem;
    color: #fff;
    margin-bottom: 5px;
}

.expert-info p {
    color: var(--accent-gold);
    font-weight: 500;
    font-size: 0.95rem;
}

.floating-badge {
    position: absolute;
    background: rgba(16, 24, 43, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 3;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.floating-badge i {
    color: var(--accent-blue);
    font-size: 1.2rem;
}

.badge-1 {
    top: 10%;
    left: -10%;
    animation: float 5s ease-in-out infinite 1s;
}

.badge-2 {
    bottom: 20%;
    right: -15%;
    animation: float 7s ease-in-out infinite 2s;
}

/* Background Blobs */
.bg-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 1;
    opacity: 0.4;
}

.blob-1 {
    top: 20%;
    right: 10%;
    width: 400px;
    height: 400px;
    background: rgba(0, 240, 255, 0.15);
}

.blob-2 {
    bottom: -10%;
    left: 20%;
    width: 500px;
    height: 500px;
    background: rgba(59, 130, 246, 0.15);
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

/* =========================================
   COMMON SECTION STYLES
========================================= */
.section-padding {
    padding: 100px 0;
}

.section-header {
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.8rem;
    margin-bottom: 20px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.text-center {
    text-align: center;
}

.dark-bg {
    background-color: rgba(10, 15, 30, 0.5);
    border-top: 1px solid rgba(255,255,255,0.02);
    border-bottom: 1px solid rgba(255,255,255,0.02);
}

/* =========================================
   FRAMEWORK (3 LAYERS)
========================================= */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 36px 28px;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 240, 255, 0.3);
    background: var(--bg-card-hover);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-normal);
}

.feature-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-blue-dim);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--accent-blue);
    margin-bottom: 20px;
}

.layer-number {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.feature-card h3 {
    font-size: 1.35rem;
    margin-bottom: 16px;
    line-height: 1.3;
}

.feature-card h3 span {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Card Objective (Mục tiêu) */
.card-objective {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    background: var(--accent-gold-dim);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    margin-bottom: 20px;
}

.card-objective i {
    color: var(--accent-gold);
    font-size: 0.85rem;
    margin-top: 3px;
    min-width: 16px;
}

.card-objective span {
    font-size: 0.9rem;
    color: var(--accent-gold);
    font-weight: 500;
    line-height: 1.5;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 0.88rem;
    color: #cbd5e1;
    line-height: 1.55;
}

.feature-list i {
    color: var(--accent-blue);
    margin-top: 3px;
    min-width: 16px;
    font-size: 0.8rem;
}

/* Card Output (Đầu ra) */
.card-output {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    background: var(--accent-blue-dim);
    border: 1px solid rgba(0, 240, 255, 0.15);
    border-radius: 12px;
    margin-top: auto;
}

.card-output i {
    color: var(--accent-blue);
    font-size: 0.8rem;
    margin-top: 4px;
    min-width: 16px;
}

.card-output span {
    font-size: 0.88rem;
    color: #e2e8f0;
    line-height: 1.55;
}

.card-output strong {
    color: var(--accent-blue);
}

/* =========================================
   TARGET AUDIENCE
========================================= */
.target-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.target-card {
    background: linear-gradient(145deg, rgba(22, 33, 62, 0.4) 0%, rgba(10, 15, 30, 0.8) 100%);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.target-card:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.target-card::after {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 150px; height: 150px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30%, -30%);
    opacity: 0;
    transition: var(--transition-normal);
    pointer-events: none;
}

.target-card:hover::after {
    opacity: 1;
}

.target-icon {
    font-size: 2.5rem;
    color: var(--accent-gold);
    margin-bottom: 20px;
}

.target-card h3 {
    font-size: 1.6rem;
    margin-bottom: 12px;
}

.target-card p.target-lead {
    color: #e2e8f0;
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px dashed rgba(255,255,255,0.1);
    line-height: 1.6;
}

.target-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.target-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 15px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.target-list li:last-child {
    margin-bottom: 0;
}

.target-list i {
    color: var(--accent-blue);
    font-size: 0.9rem;
    margin-top: 4px;
    min-width: 16px;
}

.target-list strong {
    color: #fff;
    font-weight: 500;
}

/* =========================================
   ABOUT EXPERT
========================================= */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: start;
}

.about-image {
    position: sticky;
    top: 120px;
}

.image-frame {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    z-index: 2;
}

.image-frame img {
    width: 100%;
    height: auto;
    display: block;
    filter: grayscale(20%) contrast(110%);
    transition: var(--transition-normal);
}

.image-frame:hover img {
    filter: grayscale(0%) contrast(100%);
    transform: scale(1.02);
}

.frame-border {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 24px;
    pointer-events: none;
}

.about-content .section-title {
    font-size: 2.4rem;
    margin-bottom: 28px;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.8;
}

.about-content p:first-of-type {
    color: #e2e8f0;
    font-size: 1.05rem;
    font-weight: 400;
}

.about-content p:last-of-type {
    color: var(--accent-gold);
    font-style: italic;
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    background: rgba(255,255,255,0.03);
    padding: 20px;
    border-radius: 16px;
    border-left: 3px solid var(--accent-gold);
}

.stat-number {
    font-size: 2.5rem;
    color: var(--accent-gold);
    margin-bottom: 5px;
}

/* =========================================
   GALLERY SLIDER
========================================= */
.gallery {
    position: relative;
    z-index: 1;
}

.gallery-slider-container {
    position: relative;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.gallery-slider {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
    height: 600px;
}

.gallery-slide {
    min-width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0B132B;
}

.gallery-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(11, 19, 43, 0.7);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(0, 240, 255, 0.3);
    color: var(--accent-blue);
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
}

.slider-btn:hover {
    background: var(--accent-blue);
    color: #000;
    box-shadow: 0 0 15px var(--accent-blue);
}

.slider-prev {
    left: 20px;
}

.slider-next {
    right: 20px;
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.dot {
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue);
    width: 24px;
    border-radius: 10px;
}

/* =========================================
   FOOTER & CTA
========================================= */
.footer {
    background: #04080F;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.cta-box {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 60px 40px;
    background: linear-gradient(135deg, rgba(16, 24, 43, 0.8) 0%, rgba(0, 240, 255, 0.1) 100%);
    border-radius: 30px;
    border: 1px solid rgba(0, 240, 255, 0.2);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 2;
    transform: translateY(40px);
}

.cta-box h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.cta-box p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.footer-bottom {
    padding: 80px 20px 30px;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 40px;
}

/* =========================================
   COURSES SECTION
========================================= */
.courses {
    position: relative;
    overflow: hidden;
}

.courses::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 100%;
    background: linear-gradient(180deg, transparent 0%, rgba(0,240,255,0.15) 10%, rgba(0,240,255,0.15) 90%, transparent 100%);
    z-index: 0;
}

/* Courses Hero */
.courses-hero {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    z-index: 1;
}

.courses-hero .section-title {
    font-size: 2.6rem;
    margin-bottom: 24px;
    line-height: 1.3;
}

.courses-hero-tagline {
    display: inline-block;
    background: linear-gradient(135deg, rgba(212,175,55,0.15) 0%, rgba(0,240,255,0.1) 100%);
    border: 1px solid rgba(212,175,55,0.3);
    border-radius: 12px;
    padding: 16px 32px;
    font-size: 1.1rem;
    color: var(--accent-gold);
    font-weight: 500;
    margin-bottom: 32px;
    max-width: 700px;
}

.courses-hero-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 32px;
    line-height: 1.8;
    text-align: left;
}

.courses-cta-top {
    margin-bottom: 20px;
}

.courses-cta-top .btn {
    font-size: 1.05rem;
    padding: 14px 32px;
}

/* Why Different Section */
.why-different {
    position: relative;
    z-index: 1;
    margin-bottom: 80px;
}

.why-different-title {
    font-size: 1.8rem;
    margin-bottom: 36px;
    text-align: center;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.why-item {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    gap: 16px;
    align-items: flex-start;
    transition: var(--transition-normal);
}

.why-item:hover {
    border-color: rgba(0,240,255,0.2);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}

.why-item-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background: var(--accent-blue-dim);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--accent-blue);
}

.why-item-text {
    font-size: 0.95rem;
    color: #cbd5e1;
    line-height: 1.7;
    text-align: left;
}

.why-item-text strong {
    color: var(--text-primary);
}

/* Recommendation Table */
.course-recommend {
    position: relative;
    z-index: 1;
    margin-bottom: 80px;
}

.course-recommend-title {
    font-size: 1.8rem;
    margin-bottom: 36px;
    text-align: center;
}

.recommend-table-wrap {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 20px;
    overflow: hidden;
}

.recommend-table-wrap table {
    width: 100%;
    border-collapse: collapse;
}

.recommend-table-wrap thead th {
    background: linear-gradient(135deg, rgba(0,240,255,0.1) 0%, rgba(0,119,182,0.15) 100%);
    padding: 18px 24px;
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--accent-blue);
    border-bottom: 1px solid rgba(0,240,255,0.15);
}

.recommend-table-wrap tbody td {
    padding: 16px 24px;
    font-size: 0.95rem;
    color: #cbd5e1;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    vertical-align: top;
}

.recommend-table-wrap tbody tr:last-child td {
    border-bottom: none;
}

.recommend-table-wrap tbody tr:hover {
    background: rgba(0,240,255,0.03);
}

.recommend-table-wrap tbody td strong {
    color: var(--text-primary);
}

/* Course Group */
.course-group {
    position: relative;
    z-index: 1;
    margin-bottom: 80px;
}

.course-group-header {
    text-align: center;
    margin-bottom: 16px;
}

.course-group-tag {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.course-group-tag.nhom-1 {
    background: rgba(0,240,255,0.1);
    color: var(--accent-blue);
    border: 1px solid rgba(0,240,255,0.25);
}

.course-group-tag.nhom-2 {
    background: rgba(212,175,55,0.1);
    color: var(--accent-gold);
    border: 1px solid rgba(212,175,55,0.25);
}

.course-group-tag.nhom-3 {
    background: rgba(139,92,246,0.1);
    color: #a78bfa;
    border: 1px solid rgba(139,92,246,0.25);
}

.course-group-name {
    font-size: 2rem;
    margin-bottom: 8px;
}

.course-group-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 40px;
    text-align: center;
}

/* Course Cards */
.course-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 28px;
}

.course-card {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 20px;
    padding: 0;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0,240,255,0.25);
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}

.course-card.hot-course {
    border-color: rgba(212,175,55,0.4);
    box-shadow: 0 0 30px rgba(212,175,55,0.1);
}

.course-card.hot-course:hover {
    border-color: rgba(212,175,55,0.6);
    box-shadow: 0 20px 50px rgba(212,175,55,0.2);
}

.course-card-top {
    position: relative;
    padding: 28px 28px 0;
}

.course-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.nhom-1 .course-number {
    background: rgba(0,240,255,0.1);
    color: var(--accent-blue);
    border: 1px solid rgba(0,240,255,0.25);
}

.nhom-2 .course-number {
    background: rgba(212,175,55,0.1);
    color: var(--accent-gold);
    border: 1px solid rgba(212,175,55,0.25);
}

.nhom-3 .course-number {
    background: rgba(139,92,246,0.1);
    color: #a78bfa;
    border: 1px solid rgba(139,92,246,0.25);
}

.hot-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--accent-gold) 0%, #FBBF24 100%);
    color: #0B132B;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    animation: pulse-gold 2s ease-in-out infinite;
}

@keyframes pulse-gold {
    0%, 100% { box-shadow: 0 0 0 0 rgba(212,175,55,0.4); }
    50% { box-shadow: 0 0 20px 5px rgba(212,175,55,0.15); }
}

.course-card-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--text-primary);
}

.course-card-target {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--accent-blue);
    margin-bottom: 20px;
    font-weight: 500;
}

.course-card-target i {
    font-size: 0.8rem;
}

.course-card-body {
    padding: 0 28px;
    flex: 1;
    text-align: left;
}

.course-card-body p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
    text-align: left;
}

.course-learn-list {
    margin-bottom: 20px;
}

.course-learn-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: #cbd5e1;
    line-height: 1.7;
    text-align: left;
}

.course-learn-list li i {
    color: var(--accent-blue);
    margin-top: 5px;
    font-size: 0.75rem;
    min-width: 14px;
    flex-shrink: 0;
}

.hot-course .course-learn-list li i {
    color: var(--accent-gold);
}

.course-card-footer {
    padding: 20px 28px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    border-top: 1px solid rgba(255,255,255,0.05);
    margin-top: auto;
}

.course-format {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.course-format i {
    color: var(--accent-gold);
    font-size: 0.9rem;
}

.course-card-footer .btn {
    padding: 10px 22px;
    font-size: 0.88rem;
    white-space: nowrap;
}

/* Hot course quote */
.hot-course-quote {
    background: linear-gradient(135deg, rgba(212,175,55,0.08) 0%, rgba(0,240,255,0.05) 100%);
    border-left: 3px solid var(--accent-gold);
    border-radius: 0 12px 12px 0;
    padding: 14px 20px;
    margin: 0 28px 20px;
    font-size: 0.9rem;
    color: var(--accent-gold);
    font-style: italic;
    line-height: 1.7;
    text-align: left;
}

/* Learning Format Section */
.learning-format {
    position: relative;
    z-index: 1;
    margin-bottom: 80px;
}

.learning-format-title {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 40px;
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.format-item {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 16px;
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition-normal);
}

.format-item:hover {
    border-color: rgba(0,240,255,0.2);
    transform: translateY(-4px);
}

.format-item-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-blue-dim);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--accent-blue);
    margin: 0 auto 16px;
}

.format-item h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.format-item p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* FAQ Section */
.faq-section {
    position: relative;
    z-index: 1;
    margin-bottom: 80px;
}

.faq-title {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 40px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-item:hover {
    border-color: rgba(0,240,255,0.15);
}

.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition-normal);
    user-select: none;
}

.faq-question:hover {
    color: var(--accent-blue);
}

.faq-question i {
    font-size: 0.85rem;
    color: var(--accent-blue);
    transition: transform 0.3s ease;
    min-width: 20px;
    text-align: center;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer-inner {
    padding: 0 24px 20px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Courses CTA Bottom */
.courses-cta-bottom {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 50px 0 20px;
}

.courses-cta-bottom h3 {
    font-size: 1.6rem;
    margin-bottom: 12px;
}

.courses-cta-bottom p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 1rem;
}

.courses-cta-bottom .btn {
    padding: 16px 40px;
    font-size: 1.1rem;
}

.courses-cta-links {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.courses-cta-links a {
    color: var(--accent-blue);
    font-weight: 500;
}

.courses-cta-links a:hover {
    text-decoration: underline;
}

/* Divider with star */
.courses-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin: 60px 0;
    position: relative;
    z-index: 1;
}

.courses-divider::before,
.courses-divider::after {
    content: '';
    flex: 1;
    max-width: 200px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,240,255,0.3), transparent);
}

.courses-divider i {
    color: var(--accent-blue);
    font-size: 0.7rem;
    opacity: 0.5;
}

/* Responsive table scroll */
.recommend-table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* =========================================
   RESPONSIVE DESIGN
========================================= */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.8rem; }
    .grid-3, .target-grid { grid-template-columns: repeat(2, 1fr); }
    .floating-badge { display: none; }
    .courses-hero .section-title { font-size: 2.2rem; }
    .course-group-name { font-size: 1.7rem; }
    .format-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links, .navbar .btn { display: none; }
    .hamburger { display: block; }
    
    .hero-container, .about-container, .target-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title { font-size: 2.4rem; }
    .hero-content { text-align: center; }
    .hero-subtitle { margin: 0 auto 30px; }
    .hero-buttons { justify-content: center; }
    
    .expert-card { margin: 0 auto; }
    
    .grid-3 { grid-template-columns: 1fr; }
    
    .cta-actions { flex-direction: column; }

    /* Gallery Slider responsive */
    .gallery-slider { height: 300px; }
    .slider-btn { width: 40px; height: 40px; font-size: 1rem; }
    .slider-prev { left: 10px; }
    .slider-next { right: 10px; }

    /* Courses responsive */
    .courses-hero .section-title { font-size: 1.8rem; }
    .courses-hero-tagline { font-size: 0.95rem; padding: 12px 20px; }
    .course-group-name { font-size: 1.5rem; }
    .course-cards { grid-template-columns: 1fr; }
    .format-grid { grid-template-columns: 1fr 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .recommend-table-wrap thead th,
    .recommend-table-wrap tbody td { padding: 12px 16px; font-size: 0.88rem; }
    .section-title { font-size: 2rem; }
    .why-different-title,
    .course-recommend-title,
    .learning-format-title,
    .faq-title { font-size: 1.4rem; }
}

@media (max-width: 480px) {
    .courses-hero .section-title { font-size: 1.5rem; }
    .format-grid { grid-template-columns: 1fr; }
    .course-card-top { padding: 20px 20px 0; }
    .course-card-body { padding: 0 20px; }
    .course-card-footer { padding: 16px 20px 20px; }
    .hot-course-quote { margin: 0 20px 16px; }
}