/* refined-index.css */

/* --- Variables --- */
:root {
    /* Color Palette - Dark Mode Premium */
    --bg-primary: #1c1c1e;
    --bg-secondary: #2c2c2e;
    --bg-tertiary: #3a3a3c;
    --accent-blue: #007AFF;
    --accent-blue-hover: #0056b3;
    --accent-green: #34C759;
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --border-color: #3a3a3c;

    /* Spacing */
    --container-width: 1200px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 32px;
    --spacing-lg: 64px;
    --spacing-xl: 96px;

    /* Transition */
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

/* --- Utilities --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: white;
    border: 1px solid var(--accent-blue);
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    border-color: var(--accent-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

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

.btn-secondary:hover {
    border-color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    background-color: rgba(52, 199, 89, 0.2);
    color: var(--accent-green);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* --- Header --- */
header {
    background-color: rgba(28, 28, 30, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.2rem;
}

.logo img {
    height: 32px;
    width: auto;
}

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

nav a {
    color: var(--text-secondary);
    font-weight: 500;
}

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

nav .btn {
    padding: 8px 16px;
    font-size: 0.9rem;
}

/* --- Hero Section --- */
.hero {
    padding: 160px 0 var(--spacing-xl);
    background: linear-gradient(rgba(44, 44, 46, 0.5), rgba(44, 44, 46, 0.5)), url('assets/a_frame.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    overflow: hidden;
}

.hero .container {
    margin-left: var(--spacing-lg);
}

.hero-content {
    max-width: 800px;
    text-align: left;
    margin-left: 0;
}

.hero-text h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(to right, #ffffff, #a0a0a0);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.hero-text .tagline {
    font-size: 1.5rem;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.cta-group {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-start;
}



/* --- Sections --- */
.section-dark {
    padding: 120px 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

#why-native {
    background: linear-gradient(rgba(44, 44, 46, 0.5), rgba(44, 44, 46, 0.5)), url('assets/rov_water_surface.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
}

#tech-client {
    background: linear-gradient(rgba(44, 44, 46, 0.5), rgba(44, 44, 46, 0.5)), url('assets/rov_beacon.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
}

#tech-client h2,
#tech-client p {
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

#why-native h2,
#why-native p {
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

.section-darker {
    padding: var(--spacing-xl) 0;
    background-color: #000000;
}

#features {
    background: linear-gradient(rgba(44, 44, 46, 0.5), rgba(44, 44, 46, 0.5)), url('assets/control_panel.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

#features h2,
#features p {
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.align-center {
    align-items: center;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

#problem-solution h2 {
    font-size: 1.8rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

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

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

.section-header p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
}

/* --- Grid & Cards --- */
.sync-grid,
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background-color: rgba(44, 44, 46, 0.5);
    -webkit-backdrop-filter: blur(12px) grayscale(100%);
    backdrop-filter: blur(12px) grayscale(100%);
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform var(--transition-speed);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    background-color: rgba(44, 44, 46, 0.85);
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

/* --- Feature List --- */
.feature-list {
    list-style: none;
}

.feature-list li {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: 2px solid var(--accent-blue);
}

.feature-list strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 4px;
}

/* --- CTA Section --- */
.section-cta {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.section-cta h2 {
    margin-bottom: var(--spacing-sm);
}

.section-cta p {
    margin-bottom: var(--spacing-md);
}

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

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-logo img {
    height: 24px;
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.copyright {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.developer-contact {
    font-size: 0.85rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

#beta-signup {
    scroll-margin-top: 100px;
}

.contact-section-centered {
    text-align: center;
    margin-top: 60px;
}

/* --- Responsive --- */
.image-wrapper {
    background-color: rgba(44, 44, 46, 0.7);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    nav {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-content,
    .grid-2 {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .cta-group {
        justify-content: center;
    }

    .description,
    .section-header p {
        margin-left: auto;
        margin-right: auto;
    }
}

/* --- Mission Statement --- */
#mission {
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.mission-link {
    display: block;
    padding: var(--spacing-md);
    background-color: rgba(44, 44, 46, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    transition: all var(--transition-speed);
    max-width: 800px;
    margin: 0 auto;
}

.mission-link:hover {
    background-color: rgba(44, 44, 46, 0.7);
    border-color: var(--accent-blue);
    transform: translateY(-5px);
}

.mission-quote {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.mission-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.btn-text {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* --- About Page --- */
.about-hero {
    padding: 120px 0 60px;
    background: linear-gradient(rgba(44, 44, 46, 0.8), rgba(44, 44, 46, 0.8)), url('assets/a_frame.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    text-align: center;
}

.about-content {
    padding: var(--spacing-lg) 0;
    max-width: 800px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: var(--spacing-lg);
}

.about-section h2 {
    color: var(--accent-blue);
    margin-bottom: var(--spacing-md);
}

.about-section p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.about-section blockquote {
    border-left: 4px solid var(--accent-blue);
    padding-left: var(--spacing-md);
    font-style: italic;
    margin: var(--spacing-md) 0;
    color: var(--text-primary);
}

.feature-list.no-margin {
    margin-left: 0;
}

/* --- Sync Section --- */
.section-sync {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #1c1c1e 0%, #001a33 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.section-sync::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 122, 255, 0.1) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

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

.sync-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: inline-block;
    filter: drop-shadow(0 0 10px rgba(0, 122, 255, 0.3));
}

.section-subtitle {
    opacity: 0.9;
}

/* --- Version Comparison Table --- */
.version-table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.03);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.version-table {
    width: 100%;
    border-collapse: collapse;
    background-color: transparent;
    text-align: left;
}

.version-table th,
.version-table td {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.version-table thead th {
    background-color: rgba(44, 44, 46, 0.8);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.version-table th:first-child {
    width: 40%;
}

.version-table tbody tr {
    transition: background-color var(--transition-speed);
}

.version-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

.tag-lite,
.tag-premium {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 4px;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tag-premium {
    color: var(--accent-green);
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.tag-lite {
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.version-table td.check {
    color: var(--accent-green);
    font-size: 1.4rem;
    text-align: center;
    width: 30%;
}

.version-table td.cross {
    color: rgba(255, 255, 255, 0.2);
    font-size: 1.2rem;
    text-align: center;
    width: 30%;
}

.version-table tfoot td {
    border-bottom: none;
    text-align: center;
    padding: 32px 24px;
}

.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* --- Beta CTA Box --- */
.cta-box {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #252526 100%);
    border: 1px solid var(--accent-blue);
    border-radius: 12px;
    padding: var(--spacing-lg);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: 0 0 30px rgba(0, 122, 255, 0.1);
}

.cta-box h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.cta-box p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.beta-form {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.beta-form input[type="email"] {
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    min-width: 300px;
}

.beta-form input[type="email"]:focus {
    outline: none;
    border-color: var(--accent-blue);
}

#beta-signup {
    scroll-margin-top: 100px;
}