@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --color-primary: #1d4ed8;
    --color-secondary: #0f766e;
    --color-accent: #fbbf24;
    --color-deep: #0f172a;
    --color-slate: #1f2937;
    --color-muted: #64748b;
    --color-soft: #e2e8f0;
    --color-light: #f8fafc;
    --color-white: #ffffff;

    --gradient-primary: linear-gradient(135deg, rgba(29, 78, 216, 0.95), rgba(15, 118, 110, 0.92));
    --gradient-secondary: linear-gradient(135deg, rgba(15, 118, 110, 0.92), rgba(59, 130, 246, 0.9));
    --shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.12);
    --shadow-hover: 0 24px 60px rgba(15, 23, 42, 0.18);

    --space-2xs: 0.5rem;
    --space-xs: 0.75rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    --radius-sm: 0.75rem;
    --radius-md: 1.25rem;
    --radius-lg: 2rem;

    --font-heading: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--color-slate);
    background: var(--color-light);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    display: block;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}

a:hover,
a:focus {
    color: var(--color-primary);
    opacity: 0.9;
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    color: var(--color-deep);
    line-height: 1.2;
    margin: 0 0 var(--space-sm);
}

p {
    margin: 0 0 var(--space-sm);
    color: var(--color-muted);
}

.container {
    width: min(1200px, 100%);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(248, 250, 252, 0.95);
    backdrop-filter: blur(16px);
    box-shadow: 0 12px 30px rgba(2, 6, 23, 0.06);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    gap: var(--space-sm);
}

.logo {
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--color-primary);
}

.nav-toggle {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: var(--color-white);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.nav-toggle span {
    position: relative;
    width: 22px;
    height: 2px;
    background: var(--color-deep);
    border-radius: 999px;
    transition: background 0.3s ease;
}

.nav-toggle span::before,
.nav-toggle span::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-deep);
    border-radius: 999px;
    transition: transform 0.3s ease, top 0.3s ease, bottom 0.3s ease;
}

.nav-toggle span::before {
    top: -7px;
}

.nav-toggle span::after {
    bottom: -7px;
}

.nav-toggle.is-active span {
    background: transparent;
}

.nav-toggle.is-active span::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.is-active span::after {
    bottom: 0;
    transform: rotate(-45deg);
}

.site-nav {
    position: absolute;
    inset: calc(100% + 0.5rem) var(--space-sm) auto var(--space-sm);
    background: rgba(15, 23, 42, 0.98);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-hover);
    padding: var(--space-md);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease, transform 0.35s ease;
}

.site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.nav-links {
    display: grid;
    gap: var(--space-xs);
}

.nav-links a {
    color: var(--color-white);
    font-weight: 500;
    font-size: 1rem;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: background 0.3s ease, transform 0.3s ease;
}

.nav-links a:hover,
.nav-links a:focus {
    background: rgba(79, 70, 229, 0.2);
    transform: translateX(4px);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.75rem;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
    text-decoration: none;
    min-height: 48px;
}

.btn.primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 16px 40px rgba(29, 78, 216, 0.25);
}

.btn.primary:hover,
.btn.primary:focus {
    transform: translateY(-2px);
    box-shadow: 0 22px 50px rgba(29, 78, 216, 0.28);
}

.btn.secondary {
    background: var(--color-secondary);
    color: var(--color-white);
    box-shadow: 0 16px 40px rgba(15, 118, 110, 0.25);
}

.btn.secondary:hover,
.btn.secondary:focus {
    transform: translateY(-2px);
    box-shadow: 0 22px 50px rgba(15, 118, 110, 0.28);
}

.btn.ghost {
    background: rgba(15, 23, 42, 0.08);
    color: var(--color-deep);
}

.btn.ghost:hover,
.btn.ghost:focus {
    background: rgba(15, 23, 42, 0.12);
    transform: translateY(-1px);
}

.page-hero {
    padding: var(--space-xl) 0 var(--space-lg);
    background: var(--color-white);
}

.page-hero.homepage-hero {
    background: var(--gradient-primary);
    color: var(--color-white);
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.page-hero.homepage-hero::after {
    content: '';
    position: absolute;
    inset: 10% -20% -5% 40%;
    background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.18), transparent 55%);
    filter: blur(40px);
    opacity: 0.6;
}

.page-hero.subpage-hero {
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(29, 78, 216, 0.08));
}

.hero-layout {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--space-lg);
}

.hero-content {
    display: grid;
    gap: var(--space-sm);
    align-content: start;
}

.hero-content .tagline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.78rem;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    color: inherit;
}

.hero-content p {
    font-size: clamp(1.05rem, 2.5vw, 1.2rem);
    max-width: 38rem;
    color: rgba(255, 255, 255, 0.92);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
}

.hero-media {
    position: relative;
}

.glass-card {
    background: rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.22);
    backdrop-filter: blur(18px);
    padding: var(--space-sm);
}

.learning-stats {
    display: grid;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.stat-item {
    background: rgba(255, 255, 255, 0.18);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.92);
    display: grid;
    gap: 0.25rem;
}

.stat-item strong {
    font-size: 1.5rem;
    color: var(--color-white);
}

.page-section {
    padding: var(--space-xl) 0;
}

.page-section.highlighted-section {
    background: linear-gradient(135deg, rgba(29, 78, 216, 0.08), rgba(15, 118, 110, 0.08));
}

.section-header {
    display: grid;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
    text-align: left;
}

.section-header.centered {
    text-align: center;
    justify-items: center;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.6rem);
    color: var(--color-deep);
}

.lead {
    font-size: 1.1rem;
    max-width: 42rem;
    color: var(--color-muted);
}

.grid {
    display: grid;
    gap: var(--space-md);
}

.grid.featured-grid {
    background: rgba(255, 255, 255, 0.65);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(12px);
    gap: var(--space-lg);
}

.grid.columns-2 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid.columns-3 {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: grid;
    gap: var(--space-xs);
}

.card:hover,
.card:focus-within {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.card.feature-card {
    background: linear-gradient(145deg, rgba(15, 118, 110, 0.12), rgba(59, 130, 246, 0.12));
    border: 1px solid rgba(15, 118, 110, 0.2);
}

.card h3 {
    font-size: 1.4rem;
}

.icon-bullet {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-xs);
    background: var(--gradient-secondary);
}

.insight-list {
    display: grid;
    gap: var(--space-xs);
}

.insight-list li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--color-muted);
}

.insight-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65rem;
    width: 0.6rem;
    height: 0.6rem;
    border-radius: 50%;
    background: var(--color-secondary);
}

.testimonial-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.testimonial-card {
    background: var(--color-white);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    display: grid;
    gap: var(--space-sm);
    position: relative;
}

.testimonial-card::before {
    content: '“';
    position: absolute;
    top: -20px;
    left: 20px;
    font-size: 4rem;
    color: rgba(29, 78, 216, 0.12);
    font-family: Georgia, serif;
}

.testimonial-card strong {
    color: var(--color-primary);
}

.cta-panel {
    background: var(--gradient-secondary);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: grid;
    gap: var(--space-sm);
    box-shadow: var(--shadow-hover);
}

.cta-panel h2,
.cta-panel p {
    color: var(--color-white);
}

.tutorial-catalog {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.tutorial-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-soft);
    display: grid;
    gap: var(--space-xs);
    border-left: 4px solid var(--color-primary);
}

.module-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.contact-grid {
    display: grid;
    gap: var(--space-lg);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.contact-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-soft);
    display: grid;
    gap: var(--space-xs);
}

.contact-card a {
    font-weight: 600;
    color: var(--color-secondary);
    word-break: break-word;
}

form {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-soft);
    display: grid;
    gap: var(--space-md);
}

.form-row {
    display: grid;
    gap: var(--space-sm);
}

.form-row.split {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
}

label {
    font-weight: 600;
    color: var(--color-deep);
    font-size: 0.95rem;
}

input,
textarea,
select {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(15, 23, 42, 0.12);
    background: var(--color-light);
    font-size: 1rem;
    transition: border 0.3s ease, box-shadow 0.3s ease;
    font-family: var(--font-body);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(29, 78, 216, 0.15);
}

textarea {
    min-height: 160px;
    resize: vertical;
}

.faq-list {
    display: grid;
    gap: var(--space-sm);
}

.faq-item {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    box-shadow: var(--shadow-soft);
}

details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-deep);
    list-style: none;
    position: relative;
    padding-right: 1.5rem;
}

details summary::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 0;
    font-size: 1.5rem;
    color: var(--color-primary);
    transition: transform 0.3s ease;
}

details[open] summary::after {
    transform: rotate(45deg);
}

details p {
    margin-top: var(--space-xs);
}

.legal-section {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-soft);
    margin-bottom: var(--space-md);
    display: grid;
    gap: var(--space-xs);
}

.legal-section h2 {
    font-size: 1.4rem;
    color: var(--color-primary);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

table thead {
    background: rgba(29, 78, 216, 0.12);
}

table th,
table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    color: var(--color-slate);
    font-size: 0.95rem;
}

table tbody tr:nth-child(even) {
    background: var(--color-light);
}

.cookie-banner {
    position: fixed;
    right: var(--space-sm);
    bottom: var(--space-sm);
    width: min(420px, calc(100% - 2 * var(--space-sm)));
    background: rgba(15, 23, 42, 0.96);
    color: var(--color-white);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-hover);
    display: grid;
    gap: var(--space-sm);
    transform: translateY(20px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease, transform 0.35s ease;
    z-index: 1500;
}

.cookie-banner.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.cookie-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.cookie-actions .btn {
    flex: 1 1 140px;
}

.cookie-banner a.cookie-link {
    color: var(--color-accent);
    font-weight: 600;
    text-decoration: underline;
}

.site-footer {
    background: var(--color-deep);
    color: rgba(226, 232, 240, 0.9);
    padding: var(--space-xl) 0 var(--space-lg);
    position: relative;
}

.footer-grid {
    display: grid;
    gap: var(--space-lg);
}

.footer-grid.columns-3 {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.footer-brand h2 {
    color: var(--color-white);
    font-size: 1.6rem;
}

.footer-brand p {
    color: rgba(226, 232, 240, 0.75);
}

.footer-nav {
    display: grid;
    gap: var(--space-xs);
}

.footer-nav a {
    color: rgba(226, 232, 240, 0.85);
    font-weight: 500;
}

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

.footer-contact {
    display: grid;
    gap: var(--space-xs);
}

.footer-contact a {
    color: rgba(226, 232, 240, 0.85);
    font-weight: 600;
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    margin-top: var(--space-lg);
    padding-top: var(--space-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: space-between;
    font-size: 0.9rem;
    color: rgba(226, 232, 240, 0.65);
}

.social-links {
    display: flex;
    gap: var(--space-xs);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.1);
    color: var(--color-secondary);
    font-weight: 600;
    font-size: 0.85rem;
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }

    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        background: transparent;
        box-shadow: none;
        padding: 0;
        opacity: 1;
        pointer-events: auto;
        transform: none;
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: var(--space-sm);
    }

    .nav-links a {
        color: var(--color-deep);
        padding: 0.65rem 1.1rem;
        background: transparent;
    }

    .nav-links a:hover,
    .nav-links a:focus {
        background: rgba(15, 118, 110, 0.1);
        transform: translateY(-2px);
    }

    .hero-layout {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: center;
    }

    .learning-stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .grid.featured-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .cookie-banner {
        right: var(--space-md);
        bottom: var(--space-md);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0;
    }

    .grid.featured-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .testimonial-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .page-section {
        padding: var(--space-2xl) 0;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }

    .cookie-actions {
        flex-direction: column;
    }

    .cookie-actions .btn {
        width: 100%;
    }
}