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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

    .logo img {
        width: 40px;
        height: 40px;
    }

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

    .nav-links a {
        color: white;
        text-decoration: none;
        transition: opacity 0.3s;
    }

        .nav-links a:hover {
            opacity: 0.8;
        }

.language-selector {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-btn {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

    .language-btn:hover {
        background: rgba(255,255,255,0.3);
    }

.language-dropdown.active {
    display: block;
}

.language-option {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background 0.3s;
    color: #333;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

    .language-option:hover {
        background: #f0f0f0;
    }

    .language-option.active {
        background: #e8f0fe;
        color: #1e4a8b;
        font-weight: bold;
    }

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

h1 {
    text-align: center;
}

h2 {
    margin-top: 2.5rem;
    padding-bottom: 0.5rem;
}

h3 {
    color: var(--accent-orange);
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

ul, ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
    color: #555;
}

.highlight {
    background-color: #fff3e0;
    padding: 1.5rem;
    border-left: 4px solid #ff9800;
    margin: 1.5rem 0;
    border-radius: 4px;
}

.last-updated {
    text-align: center;
    color: #999;
    margin-top: 3rem;
    font-size: 0.9rem;
}

footer {
    background: linear-gradient(135deg, #1e4a8b 0%, #2563eb 100%);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

    footer p {
        color: white;
        margin-bottom: 0.5rem;
    }

    footer a {
        color: #ffeb3b;
        text-decoration: none;
    }

        footer a:hover {
            text-decoration: underline;
        }

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 1rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .container {
        padding: 2rem 1rem;
    }
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

:root {
    --primary: #1E4A8B;
    --primary-dark: #0D2D5C;
    --accent-blue: #4A90E2;
    --accent-light: #7DBFF2;
    --accent-orange: #FF9500;
    --gold: #D4A574;
    --light-gray: #F5F7FA;
    --neutral-gray: #ABABAB;
    --text-dark: #2C3E50;
    --white: #FFFFFF;
}

header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-blue) 100%);
    color: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(30,74,139,0.1);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--white);
}

    .logo img {
        width: 40px;
        height: 40px;
    }

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

    .nav-links a {
        color: var(--white);
        text-decoration: none;
        font-weight: 500;
        transition: opacity 0.3s ease;
        font-size: 0.95rem;
    }

        .nav-links a:hover {
            opacity: 0.8;
        }

.language-selector {
    position: relative;
}

.language-btn {
    background: rgba(255,255,255,0.2);
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.3);
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.3s ease;
}

    .language-btn:hover {
        background: rgba(255,255,255,0.3);
    }

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border: 1px solid #ddd;
    border-radius: 8px;
    min-width: 150px;
    margin-top: 0.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-5px);
    transition: all 0.3s ease;
    z-index: 1000;
}

    .language-dropdown.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        min-width: 250px;
    }

.language-option {
    padding: 0.8rem 1.2rem;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transition: background 0.3s ease;
    border: none;
    width: 100%;
    text-align: left;
    font-size: 0.95rem;
}

    .language-option:hover {
        background: var(--light-gray);
    }

    .language-option.active {
        background: var(--light-gray);
        color: var(--primary);
        font-weight: 600;
    }

.cta-button {
    background: var(--accent-orange);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

    .cta-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(255,149,0,0.3);
    }

.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

    .hero::before {
        content: '';
        position: absolute;
        top: -50%;
        right: -10%;
        width: 400px;
        height: 400px;
        background: rgba(74,144,226,0.1);
        border-radius: 50%;
        z-index: 1;
    }

    .hero::after {
        content: '';
        position: absolute;
        bottom: -20%;
        left: 5%;
        width: 300px;
        height: 300px;
        background: rgba(255,149,0,0.05);
        border-radius: 50%;
        z-index: 1;
    }

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.hero h1 {
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-tagline {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.hero-tagline-icon {
    font-size: 1.5rem;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.button-primary {
    background: var(--accent-orange);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

    .button-primary:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 20px rgba(255,149,0,0.4);
    }

.button-secondary {
    background: rgba(255,255,255,0.2);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-size: 1rem;
    border: 1px solid var(--white);
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.app-preview {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

    .app-preview img {
        max-width: 150px;
        height: auto;
        border-radius: 12px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        transition: transform 0.3s ease;
    }

        .app-preview img:hover {
            transform: scale(1.05);
        }

.features {
    padding: 4rem 2rem;
    background: var(--light-gray);
    text-align: center;
}

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

.section-title {
    color: var(--text-dark);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

    .section-title::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: linear-gradient(90deg, var(--accent-orange), var(--accent-light));
        border-radius: 2px;
    }

.section-subtitle {
    font-size: 1.1rem;
    color: #435663;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border-top: 4px solid var(--accent-blue);
}

    .feature-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    }

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    color: var(--primary);
    margin-bottom: 0.8rem;
}

.feature-card p {
    color: #435663;
    line-height: 1.8;
}

.how-it-works {
    padding: 4rem 2rem;
    background: var(--white);
}

.how-it-works-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    position: relative;
}

    .timeline::before {
        content: '';
        position: absolute;
        top: 50px;
        left: 0;
        right: 0;
        height: 2px;
        background: linear-gradient(90deg, transparent, var(--accent-light), transparent);
        z-index: 0;
    }

.timeline-item {
    position: relative;
    z-index: 1;
}

.timeline-number {
    background: linear-gradient(135deg, var(--accent-orange), var(--accent-light));
    color: var(--white);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
    box-shadow: 0 4px 15px rgba(255,149,0,0.2);
}

.timeline-item h3 {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.timeline-item p {
    color: #435663;
    font-size: 0.95rem;
}

.spaced-repetition {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-blue) 100%);
    color: var(--white);
}

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

.sr-title {
    margin-bottom: 3rem;
    text-align: center;
}

.sr-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.sr-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.2);
    text-align: center;
    transition: all 0.3s ease;
}

    .sr-card:hover {
        background: rgba(255,255,255,0.15);
        transform: translateY(-3px);
    }

.sr-emoji {
    font-size: 2rem;
    margin-bottom: 0.8rem;
}

.sr-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.sr-time {
    font-size: 0.9rem;
    opacity: 0.9;
}

.download {
    padding: 4rem 2rem;
    background: var(--light-gray);
    text-align: center;
}

.download-container {
    max-width: 1000px;
    margin: 0 auto;
}

.download h2 {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.download p {
    font-size: 1.1rem;
    color: #435663;
    margin-bottom: 2.5rem;
}

.download-buttons {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.app-store-button {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    background: var(--primary);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

    .app-store-button:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 20px rgba(30,74,139,0.3);
    }

.app-icon {
    font-size: 1.5rem;
}

.contact {
    padding: 4rem 2rem;
    background: var(--white);
    text-align: center;
}

.contact-container {
    max-width: 900px;
    margin: 0 auto;
}

.contact h2 {
    color: var(--text-dark);
    margin-bottom: 3rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.contact-item {
    padding: 1.5rem;
}

.contact-label {
    font-size: 0.9rem;
    color: #435663;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.contact-info {
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

    .contact-info:hover {
        color: var(--accent-orange);
    }


.language-dropdown {
    height: 90vh;
    overflow-y: auto;
    overflow-x: hidden;
}


footer {
    background: var(--primary);
    color: var(--white);
    padding: 2rem;
    text-align: center;
    font-size: 0.95rem;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 26px;
    color: #333;
    margin-left: auto;
    cursor: pointer
}

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

    .hero h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .sr-title {
        font-size: 1.8rem;
    }

    .download h2, .contact h2 {
        font-size: 1.8rem;
    }

    .timeline::before {
        display: none;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .button-primary, .button-secondary {
        width: 100%;
        justify-content: center;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .app-store-button {
        width: 100%;
        justify-content: center;
    }

    nav {
        position: relative
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 56px;
        right: 12px;
        background: #fff;
        border: 1px solid #eee;
        border-radius: 8px;
        padding: 10px;
        box-shadow: 0 8px 20px rgba(0,0,0,.12);
        z-index: 1000
    }

        .nav-links.open {
            display: flex
        }

        .nav-links li {
            padding: 6px 4px
        }

    .hamburger {
        display: block
    }
}

html {
    scroll-behavior: smooth;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card, .timeline-item, .sr-card {
    animation: fadeInUp 0.6s ease-out forwards;
}

    .feature-card:nth-child(1) {
        animation-delay: 0.1s;
    }

    .feature-card:nth-child(2) {
        animation-delay: 0.2s;
    }

    .feature-card:nth-child(3) {
        animation-delay: 0.3s;
    }

    .feature-card:nth-child(4) {
        animation-delay: 0.4s;
    }

    .feature-card:nth-child(5) {
        animation-delay: 0.5s;
    }

    .feature-card:nth-child(6) {
        animation-delay: 0.6s;
    }