/* CSS Custom Properties (Variables) */
:root {
    /* Colors */
    --primary-blue: #1E40AF;
    --secondary-blue: #3B82F6;
    --light-blue: #EFF6FF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-600: #64748B;
    --gray-900: #1E293B;
    --white: #FFFFFF;
    --dark: #0F172A;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-28: 8rem;
    --space-32: 10rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Header */
.header {
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    padding: var(--space-8) 0;
}

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

.header-cta {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-cta .nav-link {
    border: none;
    background: transparent;
    color: var(--primary-blue);
    padding: var(--space-2) var(--space-3);
}

.header-cta .nav-link:hover {
    background: transparent;
    color: var(--secondary-blue);
}

.header-cta .nav-underline {
    position: absolute;
    bottom: -6px;
    left: 0;
    height: 2px;
    width: 100px;
    background: var(--secondary-blue);
    border-radius: 2px;
    transition: transform 0.3s ease, width 0.3s ease, left 0.3s ease;
}

.header-brand {
    display: flex;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.header-logo-img {
    width: 60px;
    height: 60px;
}

.header-brand-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--dark);
    margin: 0;
    line-height: 1.1;
}

.header-tagline {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    font-style: italic;
    margin: 0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    text-align: center;
}

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

.btn-secondary {
    background: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--gray-200);
}

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

.btn-primary:hover {
    background-color: var(--secondary-blue);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: var(--space-5) var(--space-10);
    font-size: 1.1rem;
    font-weight: 600;
    background-color: var(--primary-blue);
    color: var(--white);
    border-radius: var(--radius-lg);
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-large:hover {
    background-color: var(--secondary-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Hero Section - Web Application */
.hero {
    background: linear-gradient(135deg, #334155 0%, #3B82F6 50%, #60A5FA 100%);
    padding: calc(var(--space-20) + 80px) 0 var(--space-16) 0;
    position: relative;
    overflow: hidden;
}

.hero .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.hero-content {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--space-16);
    align-items: center;
    min-height: 540px;
}

.platform-info {
    z-index: 2;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    max-width: 520px;
}

.platform-visual {
    z-index: 1;
}

.platform-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-6);
    text-shadow: none;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.platform-title.small {
    font-size: var(--font-size-3xl);
}

.platform-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.92);
    margin-bottom: var(--space-8);
    line-height: 1.6;
    font-weight: 400;
}

.platform-features {
    list-style: none;
    margin-bottom: var(--space-10);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
}

.platform-features li {
    padding: var(--space-2) 0;
    color: rgba(255, 255, 255, 0.95);
    position: relative;
    padding-left: var(--space-8);
    font-weight: 500;
    font-size: var(--font-size-base);
}

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

.platform-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--white);
    font-weight: 700;
}

.platform-visual {
    text-align: center;
}

/* Feature Showcase */
.feature-showcase {
    position: relative;
    width: 100%;
    max-width: 760px;
    margin: 0 auto;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    background: var(--white);
    border: 1px solid rgba(0, 0, 0, 0.06);
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.feature-showcase:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

/* Feature Tabs */
.feature-tabs {
    display: flex;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.9));
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding: var(--space-2);
    gap: var(--space-1);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.feature-tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
    border: none;
    background: transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
    min-width: fit-content;
    text-align: center;
}

.tab-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-blue);
    transform: translateY(-1px);
}

.tab-btn.active {
    background: var(--primary-blue);
    color: var(--white);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
    transform: translateY(-1px);
}

.tab-text {
    font-weight: 600;
}

/* Feature Content */
.feature-content {
    position: relative;
}

.feature-display {
    position: relative;
}

.feature-image-container {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--gray-100);
}

.feature-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform: scale(1.05);
}

.feature-image.active {
    opacity: 1;
    transform: scale(1);
}

/* Soft zoom effect on active image */
.feature-image.active {
    animation: subtleZoom 6s ease-in-out infinite alternate;
}

@keyframes subtleZoom {
    0% {
        transform: scale(1);
    }

    100% {
        transform: scale(1.02);
    }
}

/* Feature Description */
.feature-description {
    position: relative;
    padding: var(--space-6);
    background: linear-gradient(180deg, var(--white), rgba(248, 250, 252, 0.8));
    min-height: 120px;
}

.description-content {
    position: absolute;
    top: var(--space-6);
    left: var(--space-6);
    right: var(--space-6);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.description-content.active {
    opacity: 1;
    transform: translateY(0);
}

.description-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.description-content p {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    line-height: 1.5;
    margin: 0;
}

/* Loading animation for tab switching */
.feature-showcase.switching .feature-image-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 0.6s ease-in-out;
    z-index: 1;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }

    100% {
        left: 100%;
    }
}

/* Mobile Apps Section */
.mobile-apps {
    padding: var(--space-24) 0;
    background-color: var(--gray-50);
}

.apps-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
}

.app-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    background-color: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.app-showcase:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.app-showcase.reverse {
    grid-template-columns: 1fr 1fr;
}

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

.app-visual.center {
    margin-left: 50px;
}

.app-visual.left {
    justify-content: center;
}

.app-visual.right {
    justify-content: center;
}

.app-mockup {
    width: 280px;
    height: auto;
    max-height: 500px;
    object-fit: contain;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
    transition: transform 0.3s ease;
}

.app-showcase:hover .app-mockup {
    transform: scale(1.02);
}

.app-content {
    padding: var(--space-4);
}

.app-content.left {
    text-align: left;
}

.app-content.right {
    text-align: left;
}

.app-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--space-4);
}

.app-description {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

.app-features {
    list-style: none;
    padding: 0;
}

.app-features li {
    padding: var(--space-2) 0;
    color: var(--gray-700);
    font-size: var(--font-size-base);
    position: relative;
    padding-left: var(--space-6);
    font-weight: 500;
}

.app-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

/* App Store Buttons */
.app-buttons {
    display: flex;
    flex-direction: row;
    gap: var(--space-3);
    margin-top: var(--space-6);
    align-items: center;
}

.store-btn {
    display: inline-block;
    transition: transform 0.2s ease, filter 0.2s ease;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.store-btn:hover {
    transform: translateY(-2px) scale(1.02);
    filter: brightness(1.05);
}

.store-badge {
    height: 50px;
    width: auto;
    display: block;
}



/* Footer */
.footer {
    background-color: var(--gray-900);
    color: var(--white);
    padding: var(--space-12) 0 var(--space-8) 0;
}

/* Invisible anchors to offset sticky header */
.section-anchor {
    position: relative;
    display: block;
    height: 0;
}

.section-anchor::before {
    content: '';
    display: block;
    height: 120px;
    /* header height + extra spacing for hero */
    margin-top: -120px;
    visibility: hidden;
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
    margin-bottom: var(--space-6);
}

.footer-links a {
    color: var(--gray-200);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color 0.2s ease;
}

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

.footer-copyright {
    color: var(--gray-600);
    font-size: var(--font-size-xs);
}

/* Legal Pages Styles */
.legal-content {
    padding: var(--space-20) 0 var(--space-16) 0;
    background-color: var(--white);
    min-height: 80vh;
}

.legal-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.legal-header {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    color: var(--dark);
    padding: var(--space-8) var(--space-6);
    text-align: left;
}

.legal-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--space-3);
    line-height: 1.2;
    color: var(--primary-blue);
}

.legal-subtitle {
    font-size: var(--font-size-base);
    color: var(--gray-600);
    margin-bottom: var(--space-3);
    line-height: 1.5;
}

.legal-date {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    font-style: italic;
}

.legal-body {
    padding: var(--space-8) var(--space-6);
}

.legal-section {
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--gray-200);
}

.legal-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.legal-section.highlight {
    background: var(--light-blue);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid var(--secondary-blue);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: var(--space-3);
    line-height: 1.3;
}

.section-text {
    font-size: var(--font-size-sm);
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.section-text:last-child {
    margin-bottom: 0;
}

.legal-list {
    list-style: none;
    padding: 0;
    margin: var(--space-4) 0;
}

.legal-list li {
    position: relative;
    padding: var(--space-1) 0 var(--space-1) var(--space-6);
    font-size: var(--font-size-sm);
    color: var(--gray-700);
    line-height: 1.5;
}

.legal-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: var(--space-1);
    color: var(--primary-blue);
    font-weight: 700;
    font-size: var(--font-size-base);
}

.contact-info {
    background: var(--gray-50);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    margin-top: var(--space-4);
}

.contact-info p {
    margin: var(--space-2) 0;
    font-size: var(--font-size-sm);
    color: var(--gray-700);
}

.contact-info a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
}

.contact-info a:hover {
    color: var(--secondary-blue);
    text-decoration: underline;
}

.legal-footer {
    padding: var(--space-8);
    background: var(--gray-50);
    text-align: center;
    border-top: 1px solid var(--gray-200);
}

.back-to-home .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}