/*
 * Global Styles for NebulaVPN
 *
 * This stylesheet defines the dark theme color palette, typography, responsive
 * layouts and component styling for the NebulaVPN landing page. The design
 * draws inspiration from modern dark web interfaces. Colors and spacing
 * variables are defined at the top for easy customization. See the README for
 * details on how to integrate these templates into a Django project.
 */

:root {
    --bg: #121212;               /* primary dark background */
    --bg-secondary: #1e1e1e;      /* secondary dark surface */
    --card-bg: #1b1b1b;          /* cards and panels */
    --text: #e0e0e0;             /* base text color */
    --text-muted: #9e9e9e;       /* muted text for subtle details */
    --accent: #0bd3a4;           /* primary accent color (turquoise) */
    --accent-hover: #099b78;     /* accent color on hover */
    --border-color: #2a2a2a;     /* subtle borders */
    --error: #e53935;            /* error accent */
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Container utility */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Navigation */
.navbar {
    background-color: var(--bg-secondary);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    z-index: 1000;
}

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

.logo {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--accent);
}

.nav-menu ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-menu a {
    color: var(--text);
    font-weight: 500;
    padding: 0.5rem;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background-color: var(--accent);
    transition: width 0.3s ease;
}

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

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--text);
    border-radius: 1px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Toggle active state for animation */
.nav-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile menu */
@media (max-width: 768px) {
    .nav-menu {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        overflow: hidden;
        max-height: 0;
        transition: max-height 0.3s ease;
    }
    .nav-menu ul {
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem 1.5rem;
        gap: 1rem;
    }
    .nav-menu.open {
        max-height: 300px;
    }
    .nav-toggle {
        display: flex;
    }
}

/* Hero Section */
.hero {
    background: url('assets/hero-bg.png') no-repeat center/cover;
    position: relative;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(18, 18, 18, 0.8) 0%, rgba(18, 18, 18, 0.9) 100%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
}

.hero p {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    margin-bottom: 2rem;
    color: var(--text-muted);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
    text-align: center;
}

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

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

.secondary-btn {
    background-color: var(--bg-secondary);
    color: var(--accent);
    border: 1px solid var(--accent);
}

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

.btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Sections */
section {
    padding: 4rem 0;
}

section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

/* Features */
.features {
    background-color: var(--bg);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 6px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-6px);
}

.feature-icon {
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

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

/* Pricing */
.pricing {
    background-color: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.pricing-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform 0.3s ease;
}

.pricing-card.highlighted {
    border: 2px solid var(--accent);
    transform: translateY(-4px);
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.pricing-card .price {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent);
}

.pricing-card ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.pricing-card ul li {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin: 0.5rem 0;
}

.pricing-card .btn {
    width: 100%;
}

/* Download Section */
.download {
    background-color: var(--bg);
}

.download-wrapper {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 2rem;
}

.download-content {
    flex: 1 1 300px;
}

.download-image {
    flex: 1 1 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.device-placeholder {
    width: 200px;
    height: 400px;
    border-radius: 20px;
    border: 2px dashed var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}
/* new png */
/* App screenshots carousel */
.app-carousel {
    width: 240px;              /* близко к placeholder */
    max-width: 100%;
    position: relative;
    display: grid;
    place-items: center;
    gap: 12px;
}

.carousel-viewport {
    width: 240px;
    height: 480px;
    border-radius: 28px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.08);
    background: rgba(0,0,0,.2);
    box-shadow: 0 20px 60px rgba(0,0,0,.45);
    touch-action: pan-y; /* allow vertical scroll, handle horizontal in JS */
}

.carousel-track {
    height: 100%;
    display: flex;
    transition: transform 260ms ease;
    will-change: transform;
}

.carousel-slide {
    min-width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    padding: 0;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 18px;
    display: block;
}

/* Arrows */
.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,.10);
    background: rgba(18, 18, 18, 0.55);
    color: var(--text);
    cursor: pointer;
    display: grid;
    place-items: center;
    font-size: 26px;
    line-height: 1;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    user-select: none;
}

.carousel-arrow:hover {
    background: rgba(11, 211, 164, 0.12);
    border-color: rgba(11, 211, 164, 0.5);
}

.carousel-arrow:active {
    transform: translateY(-50%) scale(0.96);
}

.carousel-arrow.prev { left: -18px; }
.carousel-arrow.next { right: -18px; }

/* Dots */
.carousel-dots {
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.10);
}

.carousel-dot.active {
    background: rgba(11, 211, 164, 0.9);
    border-color: rgba(11, 211, 164, 0.9);
}

/* Hide arrows on small screens, rely on swipe */
@media (max-width: 768px) {
    .carousel-arrow { display: none; }
    .app-carousel { width: 220px; }
    .carousel-viewport { width: 220px; height: 440px; }
}







.download-buttons {
    margin-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

/* Contact Section */
.contact {
    background-color: var(--bg-secondary);
}

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

.contact-form {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border-radius: 4px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    padding: 2rem 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.footer-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-nav {
    list-style: none;
    display: flex;
    gap: 1rem;
}

.footer-nav a {
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

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

/* Utility classes */
.hidden {
    display: none !important;
}