/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #007AFF;
    --color-primary-dark: #0056b3;
    --color-secondary: #5856D6;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-background: #ffffff;
    --color-background-alt: #f5f5f7;
    --color-border: #d2d2d7;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --container-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    color: var(--color-text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0056b3 0%, #4240a8 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(88, 86, 214, 0.4);
}

/* Navigation Download Button - stands out more */
.navbar .btn-primary {
    background: linear-gradient(135deg, #34C759 0%, #30D158 100%);
    color: white;
    font-weight: 600;
}

.navbar .btn-primary:hover {
    background: linear-gradient(135deg, #2aa84a 0%, #28b34a 100%);
    color: #1d1d1f;
    box-shadow: 0 4px 12px rgba(52, 199, 89, 0.4);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.125rem;
}

.btn .icon {
    width: 20px;
    height: 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

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

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--color-text);
}

/* Language Switcher */
.lang-switcher {
    position: relative;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-current:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 140px;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 100;
}

.lang-switcher:hover .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown a {
    display: block;
    padding: 10px 16px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.lang-dropdown a:first-child {
    border-radius: 8px 8px 0 0;
}

.lang-dropdown a:last-child {
    border-radius: 0 0 8px 8px;
}

.lang-dropdown a:hover {
    background: var(--color-background-alt);
    color: var(--color-text);
}

.lang-dropdown a.active {
    background: var(--color-primary);
    color: white;
}

/* Hero Section */
.hero {
    padding: calc(64px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    background: linear-gradient(180deg, var(--color-background-alt) 0%, var(--color-background) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(0, 122, 255, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(88, 86, 214, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 50% 50%, rgba(52, 199, 89, 0.05) 0%, transparent 50%);
    animation: heroGradient 20s ease-in-out infinite;
    z-index: 0;
}

@keyframes heroGradient {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(2%, 2%) rotate(1deg); }
    50% { transform: translate(-1%, 3%) rotate(-1deg); }
    75% { transform: translate(3%, -2%) rotate(0.5deg); }
}

.hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content {
    max-width: 560px;
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 100px;
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle strong {
    color: var(--color-text);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-requirements {
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Stats Bar */
.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* How It Works Section */
.how-it-works {
    padding: var(--spacing-2xl) 0;
    background: var(--color-background);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    position: relative;
}

.steps-grid::before {
    content: '';
    position: absolute;
    top: 60px;
    left: 20%;
    right: 20%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    z-index: 0;
}

.step-card {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.3);
}

.step-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.step-card p {
    font-size: 0.9375rem;
    max-width: 280px;
    margin: 0 auto;
}

/* Use Cases Section */
.use-cases {
    padding: var(--spacing-2xl) 0;
    background: var(--color-background-alt);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.use-case-card {
    padding: var(--spacing-lg);
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.use-case-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-background-alt);
    border-radius: var(--border-radius);
    font-size: 2rem;
}

.use-case-card h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

.use-case-card p {
    font-size: 0.875rem;
}

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

.app-screenshot {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
}

/* Hero Carousel */
.hero-carousel {
    width: 100%;
    max-width: 600px;
    overflow-x: auto;
    overflow-y: hidden;
}

.hero-carousel .screenshots-carousel {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    gap: 16px;
    padding: 16px;
    min-width: max-content;
}

.hero-carousel .screenshot-item {
    flex: 0 0 auto;
    display: inline-block;
}

.hero-carousel .screenshot-item img {
    width: 200px;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s ease;
}

.hero-carousel .screenshot-item:hover img {
    transform: scale(1.08);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* Features Section */
.features {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-header p {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-lg);
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: white;
}

.feature-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.feature-card p {
    font-size: 0.9375rem;
}

/* Privacy Section */
.privacy {
    padding: var(--spacing-2xl) 0;
    background: var(--color-background-alt);
}

.privacy-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.privacy-text h2 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.privacy-text > p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

.privacy-list {
    list-style: none;
}

.privacy-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    font-weight: 500;
    color: var(--color-text);
}

.privacy-list svg {
    width: 20px;
    height: 20px;
    stroke: #34C759;
    flex-shrink: 0;
}

.privacy-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.privacy-shield {
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #34C759, #30D158);
    border-radius: 50%;
    box-shadow: 0 20px 60px rgba(52, 199, 89, 0.3);
}

.privacy-shield svg {
    width: 100px;
    height: 100px;
    stroke: white;
}

/* Languages Section */
.languages {
    padding: var(--spacing-2xl) 0;
}

.language-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
}

.language-tags span {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-background-alt);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all 0.2s ease;
}

.language-tags span:hover {
    background: var(--color-primary);
    color: white;
}

/* Download Section */
.download {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--color-text) 0%, #2c2c2e 100%);
    color: white;
}

.download-content {
    text-align: center;
}

.download h2 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.download > .container > .download-content > p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
}

.app-store-badge img {
    height: 54px;
    transition: transform 0.2s ease;
}

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

.download-free {
    margin-top: var(--spacing-md);
    font-size: 1.125rem;
    font-weight: 600;
    color: #34C759;
}

.download .requirements {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* Footer */
.footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    background: var(--color-background-alt);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.footer-brand p {
    font-size: 0.875rem;
    line-height: 1.5;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

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

.footer-bottom p {
    font-size: 0.875rem;
}

.footer-bottom a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

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

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

    .hero-image {
        order: -1;
    }

    .app-screenshot {
        max-width: 400px;
    }

    .hero-carousel {
        order: -1;
        width: 100%;
        max-width: 100%;
        margin-bottom: var(--spacing-lg);
    }

    .hero-carousel .screenshot-item img {
        width: 180px;
    }

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

    .steps-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .steps-grid::before {
        display: none;
    }

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

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

    .privacy-list {
        display: inline-block;
        text-align: left;
    }

    .privacy-visual {
        order: -1;
        margin-bottom: var(--spacing-lg);
    }

    .privacy-shield {
        width: 150px;
        height: 150px;
    }

    .privacy-shield svg {
        width: 70px;
        height: 70px;
    }
}

@media (max-width: 768px) {
    .nav-links a:not(.btn) {
        display: none;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }

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

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-2xl: 3rem;
    }

    .btn-lg {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
        width: 100%;
    }

    .app-screenshot {
        max-width: 280px;
    }
}