/* 
   Corpen Premier - Professional Excel and Notion Training Brand
   Author: AI Developer
   Version: 1.0
*/

/* =========== Base Styles =========== */
:root {
    --primary-color: #3573E5;
    --secondary-color: #24C780;
    --accent-color: #FF7262;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --text-color: #334155;
    --text-light: #64748b;
    --bg-light: #f1f5f9;
    --bg-dark: #0f172a;
    --excel-color: #217346;
    --notion-color: #000000;
    --transition: all 0.3s ease;
    --box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    --border-radius: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans TC', sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: #fff;
    overflow-x: hidden;
}

ul {
    list-style: none;
}

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

a:hover {
    color: var(--secondary-color);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 100px 0;
}

/* =========== Typography =========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 15px;
    color: var(--dark-color);
}

p {
    margin-bottom: 20px;
    color: var(--text-light);
}

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

.section-header.light .section-subtitle,
.section-header.light .section-title {
    color: var(--light-color);
}

.section-header.light .section-underline {
    background-color: var(--light-color);
}

.section-subtitle {
    display: inline-block;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 15px;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.section-title {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.section-underline {
    display: block;
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 0 auto;
}

/* =========== Button Styles =========== */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
    font-size: 16px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--dark-color);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
}

.btn-secondary {
    background-color: transparent;
    color: var(--light-color);
    border: 2px solid var(--light-color);
}

.btn-secondary:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
    transform: translateY(-3px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 12px 28px;
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-white {
    background-color: #fff;
    color: var(--primary-color);
}

.btn-white:hover {
    background-color: var(--light-color);
    color: var(--dark-color);
    transform: translateY(-3px);
}

/* =========== Header & Navigation =========== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    padding: 20px 0;
    background-color: transparent;
}

header.sticky {
    background-color: #fff;
    box-shadow: var(--box-shadow);
    padding: 15px 0;
}

header.sticky .logo h1 {
    color: var(--dark-color);
}

header.sticky .nav-menu a {
    color: var(--dark-color);
}

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

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

.logo a {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    margin: 0;
}

.excel-text {
    color: var(--excel-color);
}

.notion-text {
    color: #000000;
}

.pro-text {
    color: var(--primary-color);
}

header.sticky .excel-text {
    color: var(--excel-color);
}

header.sticky .notion-text {
    color: #000000;
}

header.sticky .pro-text {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: #fff;
    margin: 5px 0;
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-menu li {
    margin: 0 15px;
}

.nav-menu a {
    color: #fff;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.cta-button {
    background-color: var(--primary-color);
    color: #fff !important;
    padding: 10px 20px !important;
    border-radius: var(--border-radius);
}

.cta-button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* =========== Hero Section =========== */
.hero {
    height: 100vh;
    min-height: 700px;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/hero-bg.jpg') no-repeat center center/cover;
    color: #fff;
    display: flex;
    align-items: center;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 56px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 25px;
    animation: fadeInDown 1s ease;
}

.hero-content p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    animation: fadeInUp 1s ease 0.3s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 20px;
    animation: fadeInUp 1s ease 0.6s forwards;
    opacity: 0;
}

/* =========== Features Section =========== */
.features {
    padding: 80px 0;
    background-color: var(--light-color);
}

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

.feature-card {
    background-color: #fff;
    padding: 40px 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background-color: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background-color: var(--primary-color);
}

.feature-icon i {
    font-size: 28px;
    color: var(--primary-color);
    transition: var(--transition);
}

.feature-card:hover .feature-icon i {
    color: #fff;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 0;
}

/* =========== About Section =========== */
.about {
    background-color: #fff;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.about-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    width: 60px;
    height: 60px;
    border-top: 5px solid var(--primary-color);
    border-left: 5px solid var(--primary-color);
    z-index: -1;
}

.about-image::after {
    content: '';
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 60px;
    height: 60px;
    border-bottom: 5px solid var(--secondary-color);
    border-right: 5px solid var(--secondary-color);
    z-index: -1;
}

.about-image img {
    transition: var(--transition);
}

.about-image:hover img {
    transform: scale(1.05);
}

.about-text h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.about-text p {
    margin-bottom: 25px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.feature {
    text-align: center;
    padding: 25px 15px;
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.feature i {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature h4 {
    font-size: 18px;
    margin-bottom: 10px;
}

.feature p {
    font-size: 14px;
    margin-bottom: 0;
}

/* =========== Services Section =========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    padding: 30px;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    position: relative;
    z-index: 1;
}

.service-card:hover {
    transform: translateY(-10px);
}

.service-icon {
    width: 70px;
    height: 70px;
    background-color: rgba(52, 152, 219, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background-color: var(--secondary-color);
}

.service-icon i {
    font-size: 28px;
    color: var(--secondary-color);
    transition: var(--transition);
}

.service-card:hover .service-icon i {
    color: #fff;
}

.service-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
}

.service-card p {
    margin-bottom: 25px;
}

.service-link {
    color: var(--secondary-color);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.service-link i {
    margin-left: 5px;
    transition: var(--transition);
}

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

/* =========== Works Section =========== */
.works {
    background-color: var(--bg-light);
}

.works-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 40px;
}

.filter-btn {
    background-color: transparent;
    border: none;
    cursor: pointer;
    padding: 8px 20px;
    margin: 0 5px 10px;
    border-radius: 30px;
    font-weight: 500;
    transition: var(--transition);
    color: var(--text-light);
}

.filter-btn.active,
.filter-btn:hover {
    background-color: var(--secondary-color);
    color: #fff;
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.work-item {
    overflow: hidden;
    border-radius: var(--border-radius);
    position: relative;
}

.work-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
}

.work-image img {
    transition: var(--transition);
}

.work-item:hover .work-image img {
    transform: scale(1.1);
}

.work-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(44, 62, 80, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.work-item:hover .work-overlay {
    opacity: 1;
}

.work-info {
    text-align: center;
    padding: 20px;
    transform: translateY(20px);
    transition: var(--transition);
}

.work-item:hover .work-info {
    transform: translateY(0);
}

.work-info h3 {
    color: #fff;
    font-size: 22px;
    margin-bottom: 10px;
}

.work-info p {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.work-link {
    display: inline-block;
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.work-link:hover {
    background-color: #fff;
    color: var(--secondary-color);
}

/* =========== Testimonials Section =========== */
.testimonials {
    background-color: #fff;
    overflow: hidden;
}

.testimonials-slider {
    display: flex;
    overflow-x: hidden;
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    height: auto;
    min-height: 300px;
    transition: transform 0.5s ease;
}

.testimonial-item {
    width: 100%;
    flex-shrink: 0;
    padding: 0 15px;
    transition: transform 0.5s ease, opacity 0.3s ease;
    display: flex;
    position: relative;
    opacity: 0.7;
}

.testimonial-item.active {
    z-index: 2;
    opacity: 1;
}

.testimonial-content {
    background-color: var(--bg-light);
    padding: 40px;
    border-radius: var(--border-radius);
    position: relative;
    box-shadow: var(--box-shadow);
    width: 100%;
    height: 100%;
}

.testimonial-quote {
    position: absolute;
    top: -20px;
    left: 40px;
    font-size: 60px;
    color: var(--primary-color);
    opacity: 0.2;
}

.testimonial-content p {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 30px;
    color: var(--text-color);
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 20px;
    border: 3px solid var(--light-color);
}

.author-info h4 {
    font-size: 18px;
    margin-bottom: 5px;
}

.author-info p {
    color: var(--text-light);
    margin: 0;
    font-size: 14px;
}

.testimonials-nav {
    display: flex;
    justify-content: center;
    margin-top: 40px;
    gap: 20px;
}

.prev-btn, .next-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--light-color);
    color: var(--primary-color);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition);
}

.prev-btn:hover, .next-btn:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.testimonial-counter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
    background-color: var(--light-color);
    padding: 8px 16px;
    border-radius: 20px;
    margin: 0 15px;
}

#current-slide {
    color: var(--primary-color);
    font-weight: 700;
}

#total-slides {
    color: var(--text-light);
}

/* =========== Stats Section =========== */
.stats {
    background-color: var(--primary-color);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    text-align: center;
}

.stat-item {
    color: #fff;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 10px;
}

.stat-item p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* =========== FAQ Section =========== */
.faq {
    background-color: var(--bg-light);
    padding: 100px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    background-color: #fff;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.faq-question {
    padding: 25px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question h3 {
    font-size: 18px;
    margin: 0;
    transition: var(--transition);
}

.faq-icon {
    color: var(--primary-color);
    font-size: 18px;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-item.active .faq-question {
    background-color: var(--primary-color);
}

.faq-item.active .faq-question h3 {
    color: #fff;
}

.faq-item.active .faq-icon {
    color: #fff;
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 30px 25px;
    max-height: 500px;
}

/* =========== CTA Section =========== */
.cta {
    background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)), url('../images/cta-bg.jpg') no-repeat center center/cover;
    padding: 100px 0;
    text-align: center;
    color: #fff;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 36px;
    color: #fff;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
}

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-item i {
    font-size: 24px;
    color: var(--primary-color);
    width: 30px;
}

.contact-item h3 {
    font-size: 18px;
    margin-bottom: 5px;
}

.contact-item p {
    margin: 0;
    color: var(--text-light);
}

.contact-social {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.contact-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--bg-light);
    border-radius: 50%;
    color: var(--primary-color);
    transition: var(--transition);
}

.contact-social a:hover {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-5px);
}

.contact-form {
    background-color: var(--bg-light);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 15px;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    background-color: #fff;
    font-family: inherit;
    font-size: 16px;
    color: var(--text-color);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(53, 115, 229, 0.1);
}

.form-group textarea {
    width: 100%;
    height: 150px;
    padding: 15px;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    resize: none;
    font-family: inherit;
    font-size: 16px;
    color: var(--text-color);
    transition: var(--transition);
}

.contact-form .btn {
    width: 100%;
    margin-top: 10px;
}

.form-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: var(--border-radius);
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.form-message.success {
    background-color: rgba(38, 203, 124, 0.1);
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    opacity: 1;
}

.form-message.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid #ef4444;
    opacity: 1;
}

/* =========== Footer Section =========== */
.footer {
    background-color: var(--dark-color);
    padding: 80px 0 30px;
    color: #fff;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-logo h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-col h3 {
    font-size: 18px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
    color: #fff;
}

.footer-col h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

.footer-terms {
    display: flex;
    gap: 20px;
}

.footer-terms a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-terms a:hover {
    color: var(--primary-color);
}

/* =========== Animations =========== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========== Responsive Styles =========== */
@media (max-width: 1200px) {
    .hero-content h1 {
        font-size: 48px;
    }
    
    .section-title {
        font-size: 32px;
    }
}

@media (max-width: 991px) {
    section {
        padding: 80px 0;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-features {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .courses-grid,
    .instructors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .hero-content h1 {
        font-size: 40px;
    }
    
    .hero-content p {
        font-size: 18px;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -300px;
        width: 280px;
        height: 100vh;
        background-color: #fff;
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 20px 30px;
        transition: right 0.3s ease;
        z-index: 99;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-menu li {
        margin: 15px 0;
        width: 100%;
    }
    
    .nav-menu a {
        color: var(--dark-color);
        width: 100%;
        display: block;
    }
    
    .cta-button {
        width: auto;
        display: inline-block;
    }
    
    .about-features {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .hero-cta {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .courses-grid,
    .instructors-grid,
    .why-us-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 25px;
    }
}

@media (max-width: 400px) {
    .hero-content h1 {
        font-size: 32px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-content {
        padding: 30px 20px;
    }
}

/* =========== Courses Section =========== */
.courses {
    background-color: #fff;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.course-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-10px);
}

.course-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover .course-image img {
    transform: scale(1.1);
}

.course-tag {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--accent-color);
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.course-content {
    padding: 30px;
}

.course-category {
    display: inline-block;
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 15px;
}

.course-content h3 {
    font-size: 22px;
    margin-bottom: 15px;
    transition: var(--transition);
}

.course-content p {
    margin-bottom: 20px;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    color: var(--text-light);
    font-size: 14px;
}

.course-meta span {
    display: flex;
    align-items: center;
}

.course-meta i {
    margin-right: 5px;
    color: var(--primary-color);
}

.courses-cta {
    text-align: center;
    margin-top: 50px;
}

/* =========== Why Us Section =========== */
.why-us {
    background: linear-gradient(rgba(14, 23, 43, 0.9), rgba(14, 23, 43, 0.9)), url('../images/why-us-bg.jpg') no-repeat center center/cover;
    color: #fff;
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.why-us-item {
    text-align: center;
    padding: 40px 20px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.why-us-item:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-10px);
}

.why-us-icon {
    width: 70px;
    height: 70px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

.why-us-icon i {
    font-size: 30px;
    color: #fff;
}

.why-us-item h3 {
    color: #fff;
    font-size: 20px;
    margin-bottom: 15px;
}

.why-us-item p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0;
}

/* =========== Instructors Section =========== */
.instructors {
    background-color: var(--bg-light);
}

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

.instructor-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.instructor-card:hover {
    transform: translateY(-10px);
}

.instructor-image {
    height: 300px;
    overflow: hidden;
}

.instructor-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.instructor-card:hover .instructor-image img {
    transform: scale(1.1);
}

.instructor-info {
    padding: 25px;
    text-align: center;
}

.instructor-info h3 {
    font-size: 22px;
    margin-bottom: 5px;
}

.instructor-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 15px;
}

.instructor-bio {
    margin-bottom: 20px;
}

.instructor-social {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.instructor-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--bg-light);
    border-radius: 50%;
    color: var(--primary-color);
    transition: var(--transition);
}

.instructor-social a:hover {
    background-color: var(--primary-color);
    color: #fff;
}

/* =========== AI Excel Courses =========== */
.course-card-advanced {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    margin-bottom: 30px;
}

.course-card-advanced:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.course-feature-list {
    margin-top: 15px;
    padding-left: 5px;
}

.course-feature-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 8px;
    color: var(--text-light);
    font-size: 14px;
}

.course-feature-list li:before {
    content: "\f00c";
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    position: absolute;
    left: 0;
    top: 2px;
    color: var(--primary-color);
    font-size: 14px;
}

.course-price {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: 600;
    margin-top: 10px;
    font-size: 15px;
}

.course-level-tag {
    display: inline-block;
    background-color: var(--bg-light);
    color: var(--text-color);
    padding: 3px 12px;
    border-radius: 15px;
    font-size: 12px;
    margin-right: 10px;
    margin-top: 5px;
}

.course-level-tag.beginner {
    background-color: #e6f7ff;
    color: #0066cc;
}

.course-level-tag.intermediate {
    background-color: #fff2e6;
    color: #ff6600;
}

.course-level-tag.advanced {
    background-color: #f6e6ff;
    color: #9933cc;
}

.ai-badge {
    display: inline-block;
    background-color: #f0f8ff;
    color: #1e90ff;
    border: 1px solid #add8e6;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-left: 10px;
    vertical-align: middle;
}

.instructor-info .btn {
    margin-top: 15px;
}