/* ========================================
   CSS Variables - Color Palette & Spacing
   ======================================== */
:root {
    /* Colors */
    --color-primary: #007AFF;
    --color-primary-dark: #0051D5;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-background: #ffffff;
    --color-background-secondary: #f5f5f7;
    --color-border: #e5e5e7;
    --color-card-bg: #ffffff;
    --color-shadow: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;

    /* Transitions */
    --transition-speed: 0.3s;

    /* Border Radius */
    --border-radius: 12px;
    --border-radius-lg: 20px;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-speed) ease;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

ul {
    list-style: none;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   Language Switcher
   ======================================== */
.language-switcher {
    position: fixed;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    z-index: 1000;
    background: var(--color-card-bg);
    border-radius: 20px;
    padding: 4px;
    box-shadow: 0 2px 10px var(--color-shadow);
    display: flex;
    gap: 4px;
}

.lang-btn {
    padding: 6px 12px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    border-radius: 16px;
    transition: all var(--transition-speed) ease;
}

.lang-btn:hover {
    background: var(--color-background-secondary);
}

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

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 999;
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

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

.logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

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

.nav-link {
    font-size: 1rem;
    color: var(--color-text);
    font-weight: 500;
}

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

.nav-link-cta {
    background: var(--color-primary);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
}

.nav-link-cta:hover {
    background: var(--color-primary-dark);
    color: white;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: var(--spacing-md) 0 var(--spacing-sm) 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
    min-height: 90vh;
    display: flex;
    align-items: center;
}

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

.hero-text {
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

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

.hero-image {
    animation: fadeInRight 1s ease-out;
}

.hero-screenshot {
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 60px var(--color-shadow);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-speed) ease;
}

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

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 122, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

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

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

/* ========================================
   Workflow Section
   ======================================== */
.workflow {
    padding: var(--spacing-md) 0;
    background: var(--color-background-secondary);
}

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.workflow-step {
    background: var(--color-card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    text-align: center;
    position: relative;
    transition: all var(--transition-speed) ease;
    opacity: 0;
    transform: translateY(30px);
}

.workflow-step.animate {
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.6s ease-out forwards;
}

.workflow-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--color-shadow);
}

.workflow-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    box-shadow: 0 5px 15px rgba(0, 122, 255, 0.3);
}

.workflow-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #f5f7fa, #e8eef5);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-md) auto var(--spacing-sm);
}

.workflow-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--color-primary);
}

.workflow-step-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.workflow-step-description {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--spacing-md) 0;
    background: var(--color-background);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature-card {
    background: var(--color-card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed) ease;
    opacity: 0;
    transform: translateY(30px);
}

.feature-card.animate {
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.6s ease-out forwards;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--color-shadow);
}

.feature-card-highlight {
    border: 2px solid var(--color-primary);
    position: relative;
    overflow: hidden;
}

.feature-card-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), #00C6FF);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), #00C6FF);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.feature-icon svg {
    width: 30px;
    height: 30px;
    stroke: white;
}

.feature-title {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.feature-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   Gallery Section
   ======================================== */
.gallery {
    padding: var(--spacing-md) 0;
    background: var(--color-background-secondary);
}

.gallery-carousel {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    margin-top: var(--spacing-lg);
}

.gallery-track {
    display: flex;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
    position: relative;
}

.gallery-item {
    min-width: 100%;
    display: none;
    transition: all 0.5s ease;
}

.gallery-item.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

.gallery-item img {
    width: 100%;
    max-height: 600px;
    object-fit: contain;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 60px var(--color-shadow);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 15px var(--color-shadow);
    z-index: 10;
}

.carousel-btn:hover {
    background: white;
}

.carousel-btn svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-text);
}

.carousel-btn-prev {
    left: -25px;
}

.carousel-btn-next {
    right: -25px;
}

.gallery-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-border);
    transition: all var(--transition-speed) ease;
}

.dot.active {
    background: var(--color-primary);
    width: 30px;
    border-radius: 5px;
}

/* ========================================
   Download Section
   ======================================== */
.download {
    padding: var(--spacing-md) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, #0051D5 100%);
    color: white;
    text-align: center;
}

.download .section-title,
.download .section-subtitle {
    color: white;
}

.download-content {
    max-width: 700px;
    margin: 0 auto;
}

.social-links {
    margin-top: var(--spacing-md);
}

.social-title {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.social-link {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed) ease;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.social-link svg {
    width: 24px;
    height: 24px;
    fill: white;
}

/* ========================================
   Privacy Section
   ======================================== */
.privacy {
    padding: var(--spacing-md) 0;
    background: var(--color-background);
}

.privacy-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

.privacy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.privacy-card {
    background: var(--color-card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed) ease;
}

.privacy-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.privacy-icon {
    width: 50px;
    height: 50px;
    background: var(--color-background-secondary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.privacy-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-primary);
}

.privacy-card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.privacy-card-description {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.privacy-note,
.privacy-contact,
.privacy-terms {
    text-align: center;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.privacy-link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: underline;
}

.privacy-link:hover {
    color: var(--color-primary-dark);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: var(--spacing-lg) 0;
    background: var(--color-background-secondary);
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.contact-email-link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: underline;
    transition: all var(--transition-speed) ease;
}

.contact-email-link:hover {
    color: var(--color-primary-dark);
    text-decoration: none;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-sm) 0 var(--spacing-xs);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

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

.footer-logo {
    width: 40px;
    height: 40px;
}

.footer-text {
    font-size: 0.875rem;
    opacity: 0.8;
}

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

.footer-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    opacity: 0.8;
    transition: all var(--transition-speed) ease;
}

.footer-link:hover {
    opacity: 1;
    transform: translateY(-2px);
}

.footer-icon {
    width: 20px;
    height: 20px;
    min-width: 20px;
    flex-shrink: 0;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xs);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
    opacity: 0.7;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-menu {
        display: none;
    }

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

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

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

    .hero-image {
        order: -1;
    }

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

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

    .carousel-btn-prev {
        left: 10px;
    }

    .carousel-btn-next {
        right: 10px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }

    .language-switcher {
        top: 10px;
        right: 10px;
    }

    .nav {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .hero {
        padding: var(--spacing-md) 0;
        min-height: auto;
    }

    .hero-image {
        display: none;
    }

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

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

    .btn {
        padding: 10px 20px;
        font-size: 0.875rem;
    }

    .btn-large {
        padding: 12px 24px;
        font-size: 1rem;
    }

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

    .section-subtitle {
        font-size: 1rem;
    }

    .carousel-btn {
        width: 40px;
        height: 40px;
    }

    .carousel-btn svg {
        width: 20px;
        height: 20px;
    }

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

    .footer-link {
        font-size: 0.8rem;
    }

    .footer-icon {
        width: 16px;
        height: 16px;
        min-width: 16px;
    }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}