:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #dbeafe;
    --dark: #0f172a;
    --dark-secondary: #1e293b;
    --light: #f8fafc;
    --white: #ffffff;
    --gray: #64748b;
    --gray-light: #cbd5e1;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    font-weight: 700;
    font-size: 20px;
}

.header__logo-img {
    height: 42px;
    width: auto;
    display: block;
}

.header__logo-icon {
    background: var(--primary);
    color: var(--white);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 14px;
    letter-spacing: 1px;
}

.header__logo-divider {
    color: var(--gray);
    font-weight: 300;
}

.header__logo-text {
    color: var(--dark);
}

.nav {
    display: flex;
    gap: 24px;
}

.nav__link {
    color: var(--dark-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.nav__link:hover {
    color: var(--primary);
}

.nav__link:hover::after {
    transform: scaleX(1);
}

.header__right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switcher {
    display: flex;
    gap: 4px;
}

.lang-link {
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray);
    padding: 4px 8px;
    border-radius: 6px;
    transition: var(--transition);
}

.lang-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.lang-link.active {
    color: var(--white);
    background: var(--primary);
}

.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background-color: var(--dark);
    background-image: url('../../images/hero-campus-library.jpg');
    background-size: cover;
    background-position: center center;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,86,219,0.4) 0%, rgba(15,23,42,0.3) 100%);
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero__badge {
    display: inline-block;
    background: rgba(255,255,255,0.15);
    color: white;
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(255,255,255,0.3);
}

.hero__title {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 800;
    color: white;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: white;
    margin-bottom: 32px;
    line-height: 1.5;
}

.hero__btn {
    display: inline-block;
    background: var(--white);
    color: var(--primary);
    padding: 16px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

.hero__btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    background: #f8fafc;
}

/* Sections */
.section {
    padding: 70px 0;
}

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

.section--dark {
    background: var(--dark);
    color: var(--white);
}

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

.section__tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.section--dark .section__tag {
    background: rgba(255,255,255,0.1);
    color: var(--white);
}

.section__title {
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.section__subtitle {
    font-size: 18px;
    color: var(--gray);
    margin-top: 12px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section--dark .section__subtitle {
    color: rgba(255,255,255,0.7);
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: -60px;
    position: relative;
    z-index: 3;
    padding-bottom: 40px;
}

.stat-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
}

.stat-card__number {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-card__label {
    font-size: 14px;
    color: var(--gray);
    font-weight: 500;
    line-height: 1.4;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.content-grid__text h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.content-grid__text p {
    color: var(--gray);
    margin-bottom: 16px;
    font-size: 16px;
}

.content-grid__image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.content-grid__image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
}

/* Achievements */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.achievement-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
    transition: var(--transition);
}

.achievement-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.achievement-card__rank {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.achievement-card__title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.achievement-card__desc {
    font-size: 14px;
    color: var(--gray);
}

/* Programs */
.programs-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-bottom: 48px;
}

.program-tag {
    background: var(--white);
    border: 1px solid var(--border);
    padding: 20px 24px;
    border-radius: var(--radius);
    font-weight: 500;
    text-align: center;
    transition: var(--transition);
    font-size: 15px;
}

.program-tag:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.program-tag--highlight {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* How it works */
.how-it-works {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 48px;
}

.step {
    text-align: center;
    position: relative;
}

.step::after {
    content: '→';
    position: absolute;
    right: -20px;
    top: 20px;
    font-size: 24px;
    color: var(--gray-light);
}

.step:last-child::after {
    display: none;
}

.step__number {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    margin: 0 auto 16px;
}

.step__title {
    font-weight: 600;
    font-size: 18px;
    margin-bottom: 8px;
}

.step__desc {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.5;
}

/* Requirements */
.requirements {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.req-card {
    background: var(--light);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.req-card__icon {
    font-size: 24px;
    color: var(--primary);
}

.req-card__text {
    font-size: 15px;
    font-weight: 500;
}

/* Videos */
.videos-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.video-card {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.video-card iframe {
    width: 100%;
    height: 280px;
    border: none;
}

/* News */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.news-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.news-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.news-card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-card__gallery {
    display: flex;
    overflow: hidden;
    position: relative;
}

.news-card__gallery .news-card__image {
    flex-shrink: 0;
    width: 33.333%;
}

.news-card__more {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 33.333%;
    background: rgba(0,0,0,0.5);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
}

.news-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 32px;
}

.news-gallery__image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.news-gallery__image:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-lg);
}

.news-card__body {
    padding: 24px;
}

.news-card__date {
    font-size: 13px;
    color: var(--gray);
    margin-bottom: 8px;
}

.news-card__title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.3;
}

.news-card__excerpt {
    font-size: 14px;
    color: var(--gray);
    margin-bottom: 16px;
    line-height: 1.5;
}

.news-card__link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
}

.news-card__link:hover {
    text-decoration: underline;
}

/* CTA */
.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    text-align: center;
    padding: 80px 0;
}

.cta-section h2 {
    color: var(--white);
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    color: rgba(255,255,255,0.9);
    font-size: 18px;
    margin-bottom: 32px;
}

.cta-section .hero__btn {
    background: var(--white);
    color: var(--primary);
}

.cta-section .hero__btn:hover {
    background: var(--light);
}

/* Footer */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer__inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer__brand .header__logo-icon {
    display: inline-block;
    margin-bottom: 16px;
}

.footer__brand .header__logo-text {
    color: var(--white);
}

.footer__desc {
    font-size: 14px;
    margin-top: 12px;
    line-height: 1.6;
}

.footer h4 {
    color: var(--white);
    margin-bottom: 16px;
    font-size: 16px;
}

.footer p, .footer a {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    display: block;
}

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

.footer__bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .how-it-works {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .step::after {
        display: none;
    }

    .videos-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
    }

    .nav.open {
        display: flex;
    }

    .burger {
        display: flex;
    }

    .header__logo-img {
        height: 28px;
    }

    .stats {
        grid-template-columns: repeat(2, 1fr);
        margin-top: -40px;
    }

    .section {
        padding: 60px 0;
    }

    .footer__inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .achievements-grid {
        grid-template-columns: 1fr;
    }

    .requirements {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .header__logo-img {
        height: 22px;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .programs-list {
        grid-template-columns: 1fr;
    }

    .news-grid {
        grid-template-columns: 1fr;
    }
}