:root {
    color-scheme: dark light;
    --bg: #ffffff;
    --text: #111111;
    --muted: #4b5563;
    --surface: #ffffff;
    --primary: #d10000;
    --primary-dark: #9b0000;
    --dark: #0f172a;
    --border: rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI Emoji", sans-serif;
    background: var(--bg);
    color: var(--text);
}

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

.navbar {
    padding: 1rem 0;
    background: #000000;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 0.05em;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
}

.nav-link:hover {
    color: #ffffff !important;
}

.header-section {
    background: linear-gradient(135deg, #000000 0%, #1b1b1b 45%, #d10000 100%);
    color: #ffffff;
}

.hero-section {
    min-height: 740px;
    padding: 5rem 0 4rem;
}

.hero-section .eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.85);
}

.hero-section h1 {
    font-size: clamp(2.8rem, 4vw, 4.5rem);
    line-height: 1.05;
    margin-bottom: 1.2rem;
}

.hero-section .lead {
    font-size: 1.06rem;
    max-width: 36rem;
    margin-bottom: 1.8rem;
    color: rgba(255, 255, 255, 0.88);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.hero-buttons .btn {
    min-width: 200px;
    padding: 1rem 1.5rem;
    border-radius: 0.85rem;
    font-weight: 600;
}

.section-tabs {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1050;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(6px);
}

.scroll-tab-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.scroll-tab-container {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    flex: 1;
    scroll-behavior: smooth;
    padding-bottom: 0.25rem;
}

.scroll-tab-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    white-space: nowrap;
}

.scroll-tab-link:hover,
.scroll-tab-link:focus {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.scroll-tab-button {
    border-radius: 999px;
    min-width: 44px;
    min-height: 44px;
}

.hero-scroll-buttons {
    overflow-x: auto;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.scroll-button-group {
    display: inline-flex;
    gap: 0.75rem;
    white-space: nowrap;
}

.hero-scroll-buttons .btn {
    flex: 0 0 auto;
}

.goal-image {
    max-width: 260px;
    width: 100%;
    border-radius: 1.5rem;
    object-fit: cover;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.hero-buttons .btn-secondary {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-buttons .btn-secondary:hover,
.hero-buttons .btn-secondary:focus {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.35);
}

.btn-outline-light {
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.85);
}

.btn-outline-light:hover,
.btn-outline-light:focus {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
    border-color: #ffffff;
}

.hero-contact {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.contact-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.2rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
}

.contact-pill--dark {
    background: rgba(255, 255, 255, 0.08);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.feature-card,
.course-card,
.download-card,
.language-card,
.about-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 15px 35px rgba(15, 23, 42, 0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.course-card-img {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    object-fit: contain;
    object-position: center;
    border-radius: 18px;
    margin-bottom: 1.5rem;
    background: rgba(255,255,255,0.92);
}

.feature-card:hover,
.course-card:hover,
.language-card:hover,
.download-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
}

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

.feature-icon,
.language-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.3rem;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: rgba(209, 0, 0, 0.12);
    font-size: 1.8rem;
}

.section {
    padding: 5rem 0;
}

.section-downloads {
    background: #fafafa;
}

.section-courses,
.section-languages,
.section-about,
.section-contact {
    background: #ffffff;
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section p {
    color: var(--muted);
}

.download-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    text-decoration: none;
    color: inherit;
    padding: 1.3rem 1.4rem;
}

.download-badge {
    padding: 0.6rem 0.9rem;
    border-radius: 999px;
    background: rgba(209, 0, 0, 0.12);
    color: var(--text);
    font-weight: 700;
}

.download-device {
    width: min(100%, 480px);
    height: 320px;
    border-radius: 32px;
    background: #000000;
    border: 1px solid rgba(209, 0, 0, 0.2);
    display: grid;
    place-items: center;
    box-shadow: 0 24px 60px rgba(209, 0, 0, 0.12);
}

.device-screen {
    width: 86%;
    height: 70%;
    border-radius: 24px;
    background: #ffffff;
    display: grid;
    place-items: center;
    text-align: center;
    font-size: 1.05rem;
    padding: 1.5rem;
    color: var(--dark);
}

.course-card h4,
.language-card h4,
.feature-card h3 {
    margin-bottom: 0.9rem;
}

.language-card {
    text-decoration: none;
    color: inherit;
}

.language-card p {
    color: var(--muted);
}

.language-card {
    min-height: 220px;
}

.about-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 0;
}

.about-list li {
    margin-bottom: 1rem;
    padding-left: 1.8rem;
    position: relative;
    color: var(--muted);
}

.about-list li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary);
    font-weight: 700;
}

.about-box {
    border-radius: 24px;
}

.contact-details a {
    color: var(--primary);
    text-decoration: none;
}

.footer-section {
    padding: 2.5rem 0;
    background: #000000;
    color: rgba(255, 255, 255, 0.75);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.85);
}

@media (max-width: 991px) {
    .hero-section {
        padding-top: 4rem;
    }
}

@media (max-width: 767px) {
    .hero-buttons {
        flex-direction: column;
    }

    .hero-contact {
        flex-direction: column;
    }

    .download-device {
        height: 260px;
    }
}

/* Social footer icons */
.social-footer-icons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.social-footer-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #000000;
    transition: transform .2s ease, background .2s ease;
    text-decoration: none;
}

.social-footer-icons a:hover {
    transform: translateY(-3px);
    background: #111111;
}

.social-footer-icons img {
    width: 100%;
    height: auto;
}

/* Social icons in contact sections */
.social-icons {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #000000;
    transition: transform .2s ease, background .2s ease;
    text-decoration: none;
}

.social-icons a:hover {
    transform: translateY(-4px);
    background: #111111;
}

.social-icons img {
    width: 100%;
    height: auto;
    border-radius: 50%;
}

.whatsapp-fab-icon {
    width: 28px;
    height: 28px;
}