/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
    /* Color Palette (Light Mode: Black/Red text on White background) */
    --bg-main: #ffffff;
    --bg-surface: #f8f9fa;
    --bg-surface-elevated: #f1f3f5;
    --primary: #ff0000; /* Red */
    --primary-glow: rgba(255, 0, 0, 0.08);
    --secondary: #000000; /* Black */
    --secondary-glow: rgba(0, 0, 0, 0.08);
    --accent: #ff0000; /* Red */
    --text-primary: #000000; /* Black */
    --text-secondary: #495057; /* Dark Grey */
    --text-muted: #868e96; /* Medium Grey */
    --border: rgba(0, 0, 0, 0.1);
    --border-focus: #ff0000;
    --error: #ff0000;
    --success: #2b8a3e;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 18px; /* 1rem = 18px */
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: Arial, Helvetica, sans-serif;
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
}

a {
    color: var(--secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul {
    list-style: none;
}

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

/* Accessibility Skip Link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 20px;
    background: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 20px;
}

/* Visually Hidden Helper (Accessibile form hiding) */
.visually-hidden {
    position: absolute !important;
    clip-path: inset(50%) !important;
    overflow: hidden !important;
    width: 1px !important;
    height: 1px !important;
    margin: -1px !important;
    padding: 0 !important;
    border: 0 !important;
    white-space: nowrap !important;
}

/* Focus Outline Styles */
*:focus-visible {
    outline: 3px solid var(--border-focus);
    outline-offset: 4px;
}

/* ==========================================================================
   LAYOUT CONTAINERS & UTILITIES
   ========================================================================== */
.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-block-end: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-block-end: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    min-height: 48px; /* Tap Target compliance */
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    min-height: 38px;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #cc0000 100%);
    color: white;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background-color: var(--text-primary);
    color: var(--bg-main);
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */
.main-header {
    height: var(--header-height);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-block-end: 1px solid var(--border);
    transition: background var(--transition-normal), height var(--transition-normal);
}

.main-header.scrolled {
    height: 70px;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.8rem;
}

.logo-text {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #000000 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-nav ul {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary);
    transition: width var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--text-primary);
}

.main-nav a.active::after {
    width: 100%;
}

.main-nav a:hover::after {
    width: 100%;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    padding-block-start: calc(var(--header-height) + 4rem);
    padding-block-end: 6rem;
    position: relative;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 0, 0, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 0, 0, 0.02) 0%, transparent 40%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-content .badge {
    background-color: var(--primary-glow);
    border: 1px solid rgba(255, 0, 0, 0.3);
    color: var(--primary);
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 100px;
    display: inline-block;
    margin-block-end: 1.5rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-block-end: 1.5rem;
    letter-spacing: -1px;
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 1.15rem;
    margin-block-end: 2.5rem;
}

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

.hero-visual {
    display: flex;
    justify-content: center;
    position: relative;
}

.mockup-container {
    width: 100%;
    max-width: 400px;
    position: relative;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    transition: transform var(--transition-normal);
}

.mockup-container:hover {
    transform: translateY(-5px) rotate(1deg);
}

.app-mockup {
    border-radius: var(--radius-lg);
    border: 6px solid var(--bg-surface-elevated);
    background: #000;
}

/* ==========================================================================
   FEATURES SECTION
   ========================================================================== */
.features-section {
    padding: 6rem 0;
    background-color: rgba(0, 0, 0, 0.01);
    border-block-start: 1px solid var(--border);
    border-block-end: 1px solid var(--border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2.5rem 2rem;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 0, 0, 0.4);
    box-shadow: 0 10px 30px rgba(255, 0, 0, 0.05);
}

.feature-icon {
    font-size: 2.5rem;
    margin-block-end: 1.5rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-block-end: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==========================================================================
   SCREENSHOTS GALLERY SECTION
   ========================================================================== */
.screenshots-section {
    padding: 6rem 0;
}

.screenshots-gallery {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    padding-block-end: 2rem;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
    scrollbar-color: var(--secondary) rgba(0, 0, 0, 0.05);
}

/* Custom scrollbar styling for webkit */
.screenshots-gallery::-webkit-scrollbar {
    height: 8px;
}

.screenshots-gallery::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.02);
    border-radius: 10px;
}

.screenshots-gallery::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
    border: 1px solid var(--bg-main);
}

.screenshots-gallery::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}

.screenshot-item {
    flex: 0 0 280px; /* fixed width for screenshots */
    scroll-snap-align: start;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 3px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-normal);
    background-color: #000;
    cursor: pointer;
}

.screenshot-item:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--primary);
    box-shadow: 0 12px 30px var(--primary-glow);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* ==========================================================================
   PRIVACY POLICY SECTION (Card style)
   ========================================================================== */
.privacy-section {
    padding: 6rem 0;
}

.privacy-card {
    background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(255, 255, 255, 0.9) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem 3rem;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.05);
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-content p {
    margin-block-end: 1.5rem;
    color: var(--text-secondary);
}

.privacy-content h3 {
    font-size: 1.4rem;
    margin-block-start: 2.5rem;
    margin-block-end: 1rem;
    color: var(--text-primary);
    border-inline-start: 3px solid var(--secondary);
    padding-inline-start: 1rem;
}

.privacy-content ul {
    margin-block-end: 1.5rem;
    padding-inline-start: 1.5rem;
    list-style-type: disc;
    color: var(--text-secondary);
}

.privacy-content li {
    margin-block-end: 0.5rem;
}

/* ==========================================================================
   FAQ SECTION (Collapsible)
   ========================================================================== */
.faq-section {
    padding: 6rem 0;
    background-color: rgba(0, 0, 0, 0.01);
    border-block-start: 1px solid var(--border);
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: rgba(0, 0, 0, 0.2);
}

.faq-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    min-height: 48px;
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--secondary);
    transition: transform var(--transition-normal);
}

.faq-trigger[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-content {
    padding: 0 1.5rem 1.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    animation: slideDown 0.25s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   SUPPORT & CONTACT FORM SECTION
   ========================================================================== */
.support-section {
    padding: 6rem 0;
    border-block-start: 1px solid var(--border);
}

.support-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: start;
}

.support-info h2 {
    font-size: 2.5rem;
    margin-block-end: 1rem;
}

.support-info > p {
    color: var(--text-secondary);
    margin-block-end: 3rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.25rem;
}

.contact-item .icon {
    font-size: 2rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    width: 60px;
    height: 60px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    font-size: 1.1rem;
    margin-block-end: 0.25rem;
}

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

/* Form Styling */
.support-form-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 3rem;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.support-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    /* Extra padding for easy mobile tapping without shifting */
    display: inline-block;
    padding-block-end: 2px;
}

.form-group input,
.form-group textarea {
    background-color: var(--bg-main);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    padding: 0.75rem 1rem;
    transition: all var(--transition-fast);
    min-height: 48px; /* Form control size guidelines */
    box-sizing: border-box;
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group input:hover,
.form-group textarea:hover {
    border-color: rgba(0, 0, 0, 0.25);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.2);
}

/* Input validation states */
.form-group.invalid input,
.form-group.invalid textarea {
    border-color: var(--error);
}

.form-group.invalid input:focus,
.form-group.invalid textarea:focus {
    box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.2);
}

.error-msg {
    color: var(--error);
    font-size: 0.8rem;
    min-height: 1.2rem;
    margin-block-start: 2px;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.main-footer {
    background-color: #f8f9fa;
    padding: 3rem 0;
    border-block-start: 1px solid var(--border);
}

.footer-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-muted);
}

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

/* ==========================================================================
   TOAST NOTIFICATION (Accessible Alert)
   ========================================================================== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--success);
    border-radius: var(--radius-sm);
    padding: 1rem 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    z-index: 9999;
    transform: translateY(150%);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.4s ease;
    pointer-events: none;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

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

.toast-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--success);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: bold;
}

.toast-message {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
}

/* ==========================================================================
   LANGUAGE SELECTOR DROPDOWN
   ========================================================================== */
.lang-selector-container {
    position: relative;
    display: inline-block;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    min-height: 38px;
}

.lang-btn:hover {
    background-color: var(--bg-surface-elevated);
    border-color: rgba(0, 0, 0, 0.2);
}

.lang-chevron {
    font-size: 0.7rem;
    transition: transform var(--transition-fast);
    color: var(--text-muted);
}

.lang-btn[aria-expanded="true"] .lang-chevron {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    min-width: 155px;
    padding: 0.5rem 0;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
    pointer-events: none;
    transition: transform var(--transition-fast) cubic-bezier(0.16, 1, 0.3, 1),
                opacity var(--transition-fast) ease;
}

.lang-dropdown.show {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.lang-dropdown li {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.lang-dropdown li:hover {
    background-color: var(--bg-surface-elevated);
    color: var(--text-primary);
}

.lang-dropdown li.active {
    font-weight: 600;
    color: var(--primary);
    background-color: var(--primary-glow);
}

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

/* ==========================================================================
   MEDIA QUERIES (Responsive Design)
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .support-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none; /* In a real app, a hamburger menu would go here. For simple single page link scanning is clean. */
    }
    
    .header-action {
        display: flex;
        gap: 0.5rem;
    }
    
    .header-action .download-btn {
        display: none;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .privacy-card {
        padding: 2.5rem 1.5rem;
    }
    
    .support-form-container {
        padding: 2rem 1.5rem;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}