:root {
    --primary-blue: #667eea;
    --primary-purple: #764ba2;
    --gradient-primary: 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%);
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-top-bar: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    --border-radius: 12px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

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

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

/* Top Bar */
.top-bar {
    background: var(--bg-top-bar);
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    color: var(--primary-blue);
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--primary-purple);
}

.top-bar-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    font-size: 0.875rem;
}

.top-bar-links a {
    color: var(--text-dark);
    text-decoration: none;
    transition: color 0.3s ease;
}

.top-bar-links a:hover {
    color: var(--primary-blue);
}

/* Main Header */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

.btn-download-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-download-header:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

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

/* Hero Section */
.hero {
    padding: 4rem 0;
    background: var(--bg-white);
}

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

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.stages-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.stage-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--gradient-light);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-dark);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.stage-btn:hover {
    border-color: var(--primary-blue);
    background: white;
    box-shadow: var(--shadow-sm);
}

.stage-btn svg {
    color: var(--primary-blue);
    flex-shrink: 0;
}

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

.download-btn-store {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s ease;
    min-width: 180px;
}

.download-btn-store:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.download-btn-store svg {
    color: var(--primary-blue);
    flex-shrink: 0;
}

.store-label {
    font-size: 0.75rem;
    color: var(--text-light);
}

.store-name {
    font-weight: 600;
    font-size: 1rem;
}

/* Hero Image */
.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    width: 280px;
    height: 560px;
    background: white;
    border-radius: 40px;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    z-index: 2;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #f0f0f0;
    border-radius: 30px;
    padding: 20px;
    overflow: hidden;
}

.app-interface {
    background: white;
    height: 100%;
    border-radius: 20px;
    padding: 20px;
}

.app-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 20px;
    border-bottom: 2px solid #e5e7eb;
}

.tab {
    padding: 0.5rem 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.tab.active {
    color: var(--primary-blue);
    border-bottom: 2px solid var(--primary-blue);
    margin-bottom: -2px;
}

.app-blocks {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.block {
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 8px;
    text-align: center;
    color: var(--text-light);
}

.block.active {
    background: var(--gradient-primary);
    color: white;
}

.floating-pills {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.pill {
    position: absolute;
    width: 60px;
    height: 120px;
    background: var(--gradient-primary);
    border-radius: 60px;
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

.pill-1 {
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.pill-2 {
    bottom: 20%;
    right: -5%;
    width: 40px;
    height: 80px;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(10deg);
    }
}

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.8;
    max-width: 800px;
    margin-bottom: 3rem;
}

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

.section-text-content {
    max-width: 600px;
}

/* Preparation Section */
.preparation-section {
    background: var(--bg-light);
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-top: 2rem;
}

.card-number {
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: 1rem;
}

.card-text {
    color: var(--text-dark);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.card-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-arrow {
    background: none;
    border: 1px solid #e5e7eb;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-light);
    transition: all 0.3s ease;
}

.nav-arrow:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.nav-dots {
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #e5e7eb;
    cursor: pointer;
}

.dot.active {
    background: var(--primary-blue);
}

.phone-mockup-dark {
    width: 280px;
    height: 560px;
    background: #2d2d2d;
    border-radius: 40px;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

.phone-screen-dark {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 30px;
    padding: 20px;
    overflow: hidden;
}

.osc-app h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.osc-tabs {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.osc-tab {
    padding: 0.5rem 0;
    color: var(--text-light);
    cursor: pointer;
    font-size: 0.875rem;
}

.osc-tab.active {
    color: var(--primary-blue);
    border-bottom: 2px solid var(--primary-blue);
    margin-bottom: -1px;
}

.video-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.video-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 0.75rem;
    border-radius: 8px;
    transition: background 0.3s ease;
}

.video-item:hover {
    background: #f8f9fa;
}

.play-icon {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.75rem;
}

.video-title {
    font-size: 0.875rem;
    color: var(--text-dark);
    line-height: 1.5;
}

/* Specialties Section */
.specialties-section {
    background: var(--bg-white);
    text-align: center;
}

.specialties-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.specialty-card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: left;
    transition: all 0.3s ease;
}

.specialty-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.specialty-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.specialty-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.specialty-description {
    color: var(--text-light);
    line-height: 1.7;
}

/* Interface Section */
.interface-section {
    background: var(--bg-light);
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.feature-item:hover {
    box-shadow: var(--shadow-md);
}

.feature-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.feature-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.feature-content {
    flex: 1;
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.feature-description {
    color: var(--text-light);
    line-height: 1.6;
    margin-top: 0.5rem;
}

.feature-arrow {
    color: var(--primary-blue);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.feature-item:not(.expanded) .feature-description {
    display: none;
}

/* Features Section */
.features-section {
    background: var(--bg-white);
}

.features-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.features-list-left {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.feature-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.feature-card-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-weight: 700;
    flex-shrink: 0;
}

.feature-card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    flex: 1;
}

.feature-card-description {
    margin-top: 1rem;
    color: var(--text-light);
    line-height: 1.6;
    padding-left: 3rem;
}

.feature-card-arrow {
    color: var(--primary-blue);
    font-size: 1.25rem;
    margin-left: auto;
}

.feature-card:not(.expanded) .feature-card-description {
    display: none;
}

/* Advantages Section */
.advantages-section {
    background: var(--bg-light);
}

.advantages-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.advantage-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.advantage-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.advantage-content {
    flex: 1;
    display: flex;
    gap: 1.5rem;
}

.advantage-number {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-light);
    min-width: 40px;
}

.advantage-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.advantage-description {
    color: var(--text-light);
    line-height: 1.7;
}

.section-footer {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

/* Keywords Section */
.keywords-section {
    background: var(--bg-white);
    padding: 3rem 0;
}

.keywords-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    max-width: 1000px;
    margin: 0 auto;
}

.keywords-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.keyword-tag {
    padding: 0.625rem 1.25rem;
    background: var(--gradient-light);
    border-radius: 20px;
    text-decoration: none;
    color: var(--text-dark);
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.keyword-tag:hover {
    background: var(--gradient-primary);
    color: white;
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: var(--gradient-primary);
    color: white;
    padding: 3rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.footer-left,
.footer-right {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-left p,
.footer-right p {
    margin: 0;
    font-size: 0.875rem;
}

.footer-left a,
.footer-right a {
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

.footer-left a:hover,
.footer-right a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-wrapper,
    .section-wrapper,
    .features-wrapper {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

    .hero-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .top-bar-content {
        justify-content: center;
        text-align: center;
    }

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

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

    .section-title {
        font-size: 1.75rem;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    section {
        padding: 3rem 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .download-buttons-hero {
        flex-direction: column;
    }

    .download-btn-store {
        width: 100%;
    }

    .phone-mockup,
    .phone-mockup-dark {
        width: 240px;
        height: 480px;
    }
}

html {
    scroll-behavior: smooth;
}