:root {
    --primary: #1b1f3b;
    --primary-light: #2f3b70;
    --primary-dark: #0f1428;
    --secondary: #ecf2ff;
    --accent: #3f8cff;
    --accent-light: #7bb3ff;
    --text: #1a1d2e;
    --text-light: #4b5870;
    --text-muted: #8a94a6;
    --bg: #f6f8fc;
    --bg-alt: #ffffff;
    --bg-gradient: linear-gradient(135deg, #f6f8fc 0%, #e7eefc 100%);
    --border: #e2e8f5;
    --success: #2abf88;
    --warning: #f5a524;
    --danger: #ef5a5a;
    --radius: 14px;
    --radius-sm: 10px;
    --radius-lg: 20px;
    --shadow: 0 8px 20px rgba(15, 20, 40, 0.08);
    --shadow-md: 0 12px 32px rgba(15, 20, 40, 0.12);
    --shadow-lg: 0 20px 60px rgba(15, 20, 40, 0.18);
    --glass: rgba(255, 255, 255, 0.78);
    --glass-border: rgba(255, 255, 255, 0.5);
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg-gradient);
}

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

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

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

header {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
}

.logo svg {
    width: 36px;
    height: 36px;
}

.nav-desktop {
    display: none;
}

.nav-desktop ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-desktop a {
    color: var(--text);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

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

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

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

.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 100;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-mobile {
    display: none;
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 20px;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    box-shadow: var(--shadow-md);
    z-index: 99;
}

.nav-mobile.open {
    display: block;
}

.nav-mobile ul {
    list-style: none;
    flex-direction: column;
    gap: 0;
}

.nav-mobile li {
    border-bottom: 1px solid var(--border);
}

.nav-mobile li:last-child {
    border-bottom: none;
}

.nav-mobile a {
    display: block;
    padding: 15px;
    color: var(--text);
    font-size: 1rem;
}

.nav-mobile a:hover {
    background: var(--secondary);
    color: var(--primary);
}

.nav-mobile.open {
    display: block;
}

.nav-mobile ul {
    list-style: none;
}

.nav-mobile li {
    margin-bottom: 15px;
}

.nav-mobile a {
    color: var(--text);
    font-weight: 500;
    display: block;
    padding: 10px 0;
}

.hero {
    background: linear-gradient(120deg, rgba(15, 20, 40, 0.85), rgba(45, 77, 160, 0.55)), url('images/hero-banner.jpg') center/cover no-repeat;
    padding: 160px 20px 120px;
    text-align: left;
    color: white;
    position: relative;
    overflow: hidden;
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(52, 152, 219, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(39, 174, 96, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(231, 76, 60, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 20s linear infinite;
    pointer-events: none;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

.hero-floating {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-floating::before,
.hero-floating::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 50%;
    animation: float 15s ease-in-out infinite;
}

.hero-floating::before {
    top: -100px;
    right: -50px;
}

.hero-floating::after {
    bottom: -150px;
    left: -100px;
    animation-delay: -5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(30px) rotate(5deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 760px;
    width: 100%;
    padding: 44px;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-lg);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.35);
    color: #ffffff;
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    line-height: 1.15;
    font-weight: 700;
    color: #ffffff;
}

.hero p {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 30px;
    line-height: 1.7;
}

.hero .btn {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

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

.section {
    padding: 70px 20px;
}

.section-alt {
    background: linear-gradient(180deg, #ffffff 0%, #f3f6ff 100%);
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
}

.feature-card {
    background: #ffffff;
    padding: 36px 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

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

.feature-icon {
    width: 72px;
    height: 72px;
    background: #f2f5ff;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease, opacity 0.3s ease;
}

.feature-card:hover .feature-icon img {
    transform: scale(1.08);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--accent);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--primary);
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.learning-path {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    position: relative;
}

.learning-path::before {
    content: '';
    position: absolute;
    top: 42px;
    left: 8%;
    right: 8%;
    height: 3px;
    background: linear-gradient(90deg, rgba(63, 140, 255, 0.4), rgba(42, 191, 136, 0.4));
    border-radius: 2px;
    opacity: 0.5;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background: #ffffff;
    padding: 32px 22px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
}

.step:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    flex-shrink: 0;
    width: 45px;
    height: 45px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow);
}

.step-icon {
    width: 86px;
    height: 86px;
    border-radius: 22px;
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
    background: #f2f5ff;
}

.step-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.step:hover .step-icon img {
    transform: scale(1.05);
}

.step-content h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--primary);
    font-weight: 600;
}

.step-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
}

.article-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.article-image {
    height: 210px;
    background: #eef3ff;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.article-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: linear-gradient(to top, rgba(15, 20, 40, 0.2), transparent);
    pointer-events: none;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.article-image svg {
    width: 60px;
    height: 60px;
    stroke: var(--accent);
    opacity: 0.6;
}

.article-body {
    padding: 25px;
}

.article-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--primary);
}

.article-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.article-meta {
    display: flex;
    gap: 15px;
    font-size: 0.8rem;
    color: var(--text-light);
}

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

.faq-item {
    background: #ffffff;
    border-radius: var(--radius);
    margin-bottom: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border);
}

.faq-question {
    padding: 20px 25px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--primary);
}

.faq-question svg {
    width: 20px;
    height: 20px;
    transition: var(--transition);
    stroke: var(--text-light);
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    display: none;
    padding: 0 25px 20px;
    color: var(--text-light);
}

.faq-item.open .faq-answer {
    display: block;
}

.notice-box {
    background: #fff8e6;
    border-left: 4px solid var(--warning);
    padding: 25px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin-top: 40px;
}

.notice-box h4 {
    color: var(--warning);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.notice-box p {
    color: var(--text);
    font-size: 0.95rem;
}

.glossary-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.glossary-item {
    background: var(--bg);
    padding: 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.glossary-item dt {
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.glossary-item dd {
    color: var(--text-light);
    font-size: 0.95rem;
}

.glossary-note {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-light);
    font-style: italic;
}

.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 50px 20px;
    text-align: center;
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.page-header p {
    opacity: 0.9;
}

.content-body {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.content-body h2 {
    font-size: 1.5rem;
    color: var(--primary);
    margin: 40px 0 20px;
}

.content-body h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin: 30px 0 15px;
}

.content-body p {
    margin-bottom: 20px;
    color: var(--text);
}

.content-body ul, .content-body ol {
    margin-bottom: 20px;
    padding-left: 25px;
}

.content-body li {
    margin-bottom: 10px;
    color: var(--text);
}

.content-body strong {
    color: var(--primary);
}

.changelog-list {
    border-left: 3px solid var(--border);
    padding-left: 30px;
    margin: 30px 0;
}

.changelog-item {
    position: relative;
    padding-bottom: 35px;
}

.changelog-item:last-child {
    padding-bottom: 0;
}

.changelog-item::before {
    content: '';
    position: absolute;
    left: -39px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: var(--shadow);
}

.changelog-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

.changelog-content h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    color: var(--primary);
}

.changelog-content p {
    color: var(--text-light);
    line-height: 1.7;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg);
    padding: 35px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary);
}

.form-group input, 
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-note {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 8px;
}

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

.form-submit .btn {
    width: 100%;
    max-width: 250px;
}

.contact-info {
    text-align: center;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 10px;
}

.contact-info a {
    color: var(--accent);
    font-weight: 500;
}

.about-section {
    margin-bottom: 50px;
}

.about-section h2 {
    font-size: 1.4rem;
    color: var(--primary);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--secondary);
}

.about-section p {
    margin-bottom: 15px;
    color: var(--text);
}

.editor-note {
    background: var(--secondary);
    padding: 20px;
    border-radius: var(--radius);
    margin-top: 30px;
}

.editor-note h4 {
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 1rem;
}

.editor-note p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0;
}

.error-notice {
    text-align: center;
    padding: 40px 20px;
}

.error-notice svg {
    width: 80px;
    height: 80px;
    stroke: var(--text-light);
    margin-bottom: 25px;
}

.error-notice h2 {
    color: var(--primary);
    margin-bottom: 15px;
}

.error-notice p {
    color: var(--text-light);
    margin-bottom: 25px;
}

footer {
    background: linear-gradient(135deg, #101526 0%, #1c2450 100%);
    color: white;
    padding: 70px 20px 35px;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 15% 85%, rgba(63, 140, 255, 0.16) 0%, transparent 45%),
        radial-gradient(circle at 80% 20%, rgba(42, 191, 136, 0.12) 0%, transparent 45%);
    pointer-events: none;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    opacity: 1;
    font-weight: 600;
}

.footer-col p {
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 12px;
}

.footer-newsletter {
    background: rgba(255, 255, 255, 0.08);
    padding: 34px;
    border-radius: var(--radius);
    margin-bottom: 40px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-newsletter h4 {
    margin-bottom: 10px;
    color: white;
    font-size: 1.2rem;
}

.footer-newsletter p {
    margin-bottom: 25px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.footer-newsletter-form {
    display: flex;
    gap: 10px;
    max-width: 500px;
    margin: 0 auto;
}

.footer-newsletter-form input {
    flex: 1;
    padding: 12px 15px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.12);
    color: white;
    font-size: 1rem;
    transition: var(--transition);
}

.footer-newsletter-form input:focus {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
    outline: none;
}

.footer-newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.footer-newsletter-form button {
    padding: 12px 25px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.footer-newsletter-form button:hover {
    background: var(--accent-light);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
}

.footer-col a {
    color: rgba(255,255,255,0.75);
    font-size: 0.9rem;
    transition: var(--transition);
    display: inline-block;
}

.footer-col a:hover {
    color: white;
    transform: translateX(5px);
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

.footer-social svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.footer-bottom {
    padding-top: 25px;
    border-top: 1px solid rgba(255,255,255,0.2);
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.75;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

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

.footer-bottom-links a {
    color: rgba(255,255,255,0.7);
    font-size: 0.8rem;
}

@media (max-width: 767px) {
    .hero {
        padding: 60px 15px 50px;
        min-height: auto;
    }
    
    .hero-grid,
    .hero-floating {
        display: none;
    }
    
    .hero-content {
        padding: 25px 20px;
        margin: 0 10px;
    }
    
    .hero h1 {
        font-size: 1.75rem;
        line-height: 1.3;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-badge {
        font-size: 0.75rem;
        padding: 5px 12px;
    }
    
    .section {
        padding: 50px 15px;
    }
    
    .section-title h2 {
        font-size: 1.6rem;
    }
    
    .section-title p {
        font-size: 0.95rem;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-card {
        padding: 25px 20px;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
    }
    
    .learning-path {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .learning-path::before {
        display: none;
    }
    
    .step {
        padding: 20px;
        flex-direction: row;
        text-align: left;
        align-items: flex-start;
    }
    
    .step-icon {
        width: 60px;
        height: 60px;
        flex-shrink: 0;
        margin-bottom: 0;
        margin-right: 15px;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .article-image {
        height: 160px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-newsletter-form {
        flex-direction: column;
    }
    
    .footer-newsletter-form button {
        width: 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .faq-list {
        gap: 15px;
    }
    
    .faq-question {
        padding: 15px;
        font-size: 0.95rem;
    }
    
    .faq-answer {
        padding: 0 15px 15px;
    }
    
    .notice-box {
        padding: 20px;
    }
    
    .notice-box h4 {
        font-size: 1rem;
    }
    
    .notice-box p {
        font-size: 0.9rem;
    }
    
    header .header-inner {
        padding: 15px;
    }
    
    .logo {
        font-size: 1.2rem;
    }
    
    .logo svg {
        width: 32px;
        height: 32px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
    
    .btn-primary {
        width: 100%;
        text-align: center;
    }
    
    .section-alt {
        padding: 50px 15px;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
    }
    
    .feature-card p {
        font-size: 0.9rem;
    }
    
    .step-content h3 {
        font-size: 1.05rem;
    }
    
    .step-content p {
        font-size: 0.85rem;
    }
    
    .article-body {
        padding: 20px;
    }
    
    .article-body h3 {
        font-size: 1.1rem;
    }
    
    .article-body p {
        font-size: 0.9rem;
    }
    
    .article-meta {
        font-size: 0.8rem;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .article-meta span {
        padding: 4px 10px;
    }
    
    .notice-box ul {
        padding-left: 20px;
    }
    
    .notice-box li {
        font-size: 0.9rem;
        margin-bottom: 8px;
    }
    
    .feature-card ul {
        padding-left: 18px;
    }
    
    .feature-card li {
        font-size: 0.9rem;
        margin-bottom: 8px;
    }
    
    .footer-newsletter {
        padding: 20px;
    }
    
    .footer-col {
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-bottom-links {
        justify-content: center;
    }
    
    .glossary-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .glossary-item {
        padding: 15px;
    }
    
    .glossary-item h3 {
        font-size: 1rem;
    }
    
    .glossary-item p {
        font-size: 0.9rem;
    }
    
    .contact-form {
        padding: 20px;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .form-group label {
        font-size: 0.9rem;
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 12px;
        font-size: 0.95rem;
        width: 100%;
        min-height: 44px;
    }
    
    a {
        min-height: 44px;
        display: inline-block;
    }
    
    .faq-question {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .nav-mobile a {
        min-height: auto;
    }
    
    .footer-col a {
        min-height: auto;
        display: inline-block;
        padding: 8px 0;
    }
    
    img {
        max-width: 100%;
        height: auto;
    }
    
    .feature-icon img,
    .step-icon img,
    .article-image img {
        max-width: 100%;
        height: auto;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .section-title {
        margin-bottom: 30px;
    }
    
    .glossary-item {
        word-wrap: break-word;
    }
}

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .nav-desktop {
        display: block;
    }

    .features {
        grid-template-columns: repeat(3, 1fr);
    }

    .learning-path {
        grid-template-columns: repeat(2, 1fr);
    }

    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .glossary-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero h1 {
        font-size: 2.8rem;
    }

    .section-title h2 {
        font-size: 2rem;
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }

    .learning-path {
        grid-template-columns: repeat(4, 1fr);
    }

    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .articles-grid.featured-four {
        grid-template-columns: repeat(4, 1fr);
    }
}