:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #8b9aff;
    --secondary: #764ba2;
    --accent: #f093fb;
    --bg: #0f0f1a;
    --bg-alt: #1a1a2e;
    --bg-card: #16213e;
    --text: #ffffff;
    --text-light: rgba(255, 255, 255, 0.85);
    --text-muted: rgba(255, 255, 255, 0.6);
    --border: rgba(102, 126, 234, 0.2);
    --success: #4ade80;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-light: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(102, 126, 234, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
    animation: ambient 20s ease infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes ambient {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-5%, 5%) rotate(180deg); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 15, 26, 0.9);
    backdrop-filter: blur(20px);
    box-shadow: 0 2px 30px rgba(102, 126, 234, 0.1);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

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

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: 0.25rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.3rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.lang-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
}

.lang-btn.active {
    background: var(--gradient);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.5);
}

.btn-store {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    padding: 0.85rem 1.75rem;
    gap: 0.85rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-store:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-online {
    background: var(--gradient);
    color: white;
    padding: 0.85rem 1.75rem;
    gap: 0.85rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-online:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.6);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-online-footer {
    width: auto;
    min-width: 220px;
}

.store-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.store-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.store-small {
    font-size: 0.75rem;
    font-weight: 400;
    opacity: 0.9;
}

.store-large {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Hero Section */
.hero {
    padding: 140px 0 100px;
    background: var(--bg);
    position: relative;
    z-index: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 900;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.75rem;
    color: var(--text-light);
    margin-bottom: 1.25rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: stretch;
    width: 75%;
    margin: 25px 50px;
}

.btn-online-hero {
    width: 100%;
    margin-bottom: 10px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-features {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.95rem;
}

.hero-feature svg {
    width: 20px;
    height: 20px;
    color: var(--success);
}

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

.phone-mockup {
    width: 320px;
    height: 640px;
    background: var(--gradient);
    border-radius: 45px;
    padding: 16px;
    box-shadow: 
        0 30px 80px rgba(102, 126, 234, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.1) inset,
        0 0 60px rgba(102, 126, 234, 0.3);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 25px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 0 0 20px 20px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
    border-radius: 32px;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5) inset;
    position: relative;
    overflow: hidden;
}

.phone-screen::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.2) 0%, transparent 70%);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Screenshots Section */
.screenshots {
    padding: 80px 0;
    background: var(--bg-alt);
}

.screenshots-slider {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 60px;
}

.screenshots-track {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 1rem 0;
}

.screenshots-track::-webkit-scrollbar {
    display: none;
}

.screenshot-item {
    flex: 0 0 280px;
    transition: transform 0.3s ease;
}

.screenshot-item:hover {
    transform: scale(1.05);
}

.screenshot-placeholder {
    aspect-ratio: 9/19.5;
    background: var(--gradient);
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    color: white;
    padding: 2rem;
    box-shadow: 
        0 10px 40px rgba(102, 126, 234, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    position: relative;
    overflow: hidden;
}

.screenshot-placeholder::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 20px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 0 0 15px 15px;
}

.screenshot-placeholder svg {
    width: 60px;
    height: 60px;
    opacity: 0.9;
}

.screenshot-placeholder span {
    font-weight: 600;
    text-align: center;
    font-size: 1.1rem;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: white;
    border: none;
    font-size: 2rem;
    color: var(--primary);
    cursor: pointer;
    box-shadow: 0 4px 12px var(--shadow);
    transition: all 0.3s ease;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.slider-btn:hover {
    background: var(--primary);
    color: white;
    box-shadow: 0 6px 20px var(--shadow-lg);
}

.slider-btn.prev {
    left: 0;
}

.slider-btn.next {
    right: 0;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--bg);
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4rem;
    letter-spacing: -0.02em;
}

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

.feature-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient);
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover::before {
    transform: translateX(0);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 50px rgba(102, 126, 234, 0.4);
    border-color: rgba(102, 126, 234, 0.5);
    background: rgba(22, 33, 62, 0.8);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* Screenshots Section */
.screenshots {
    padding: 100px 0;
    background: var(--bg-alt);
    position: relative;
    z-index: 1;
}

.screenshots::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-light);
    z-index: 0;
    pointer-events: none;
}

/* About Section */
.about {
    padding: 100px 0;
    background: var(--bg);
    position: relative;
    z-index: 1;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text {
    background: var(--bg-card);
    padding: 3.5rem;
    border-radius: 24px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
}

.about-text h2 {
    text-align: left;
    margin-bottom: 1.5rem;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.9;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.tech-stack {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.tech-stack h3 {
    font-size: 1.35rem;
    color: var(--text);
    margin-bottom: 1.25rem;
    font-weight: 700;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
}

.tech-tag {
    padding: 0.65rem 1.25rem;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-light);
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.4);
    transform: translateY(-2px);
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(102, 126, 234, 0.3);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 900;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.75rem;
}

.stat-label {
    font-size: 1.05rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Download Section */
.download {
    padding: 100px 0;
    background: var(--bg-alt);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient);
    opacity: 0.1;
    z-index: 0;
}

.download-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.download .section-title {
    margin-bottom: 1.5rem;
}

.download-subtitle {
    font-size: 1.35rem;
    color: var(--text-light);
    margin-bottom: 3.5rem;
}

.download-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: var(--bg);
    color: white;
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.footer-logo-text {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-tagline {
    opacity: 0.8;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-light);
}

.btn-donate {
    display: inline-block;
    padding: 0.85rem 1.75rem;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-donate:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}

.footer-bottom {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
}

.footer-bottom p {
    margin: 0.25rem 0;
}

.footer-bottom a {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

/* Responsive */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
    }

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-features {
        justify-content: center;
    }

    .screenshots-slider {
        padding: 0 50px;
    }

    .screenshot-item {
        flex: 0 0 220px;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: row;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        padding: 2rem;
        box-shadow: 0 4px 20px var(--shadow);
        border-top: 1px solid var(--border);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        gap: 1rem;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
    }

    .language-switcher {
        width: 100%;
        justify-content: center;
    }

    .screenshots-slider {
        padding: 0 40px;
    }

    .slider-btn {
        width: 35px;
        height: 35px;
        font-size: 1.5rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

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

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

    .btn-store {
        flex: 1;
        min-width: 250px;
    }

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

    .about-stats {
        flex-direction: column;
    }

    .about-text {
        padding: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }

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

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn-store {
        width: 100%;
    }

    .screenshots-slider {
        padding: 0 30px;
    }

    .screenshot-item {
        flex: 0 0 200px;
    }

    .slider-btn {
        width: 30px;
        height: 30px;
        font-size: 1.25rem;
    }
}