/* ========================================
   POCKET SCIENCE - COSMIC OBSERVATORY
   Shared Design System v1.0
   ======================================== */

:root {
    /* Deep space palette */
    --void: #050508;
    --cosmos: #0a0a0f;
    --nebula: #0f0f18;
    --stellar: #1a1a28;
    --dust: #2a2a3a;

    /* Bioluminescent accents */
    --aurora-cyan: #00f5d4;
    --aurora-teal: #00bfa6;
    --aurora-blue: #00bbf9;
    --aurora-violet: #9b5de5;
    --aurora-pink: #f15bb5;

    /* Text hierarchy */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --text-muted: rgba(255, 255, 255, 0.35);

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, sans-serif;

    /* Spacing scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 10rem;

    /* Layout */
    --container-max: 1400px;
    --gutter: clamp(1rem, 4vw, 3rem);

    /* Effects */
    --glow-subtle: 0 0 40px rgba(0, 245, 212, 0.15);
    --glow-strong: 0 0 80px rgba(0, 245, 212, 0.3);
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Starfield Background */
.starfield {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(0, 187, 249, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(155, 93, 229, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, var(--cosmos) 0%, var(--void) 100%);
}

.starfield::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(1px 1px at 20px 30px, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 40px 70px, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 50px 160px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.2), transparent),
        radial-gradient(1.5px 1.5px at 160px 120px, rgba(0, 245, 212, 0.5), transparent),
        radial-gradient(1px 1px at 200px 50px, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 250px 140px, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 280px 90px, rgba(255,255,255,0.4), transparent);
    background-repeat: repeat;
    background-size: 300px 200px;
    animation: twinkle 8s ease-in-out infinite alternate;
}

@keyframes twinkle {
    0% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin: 0 0 var(--space-md) 0;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); margin-top: var(--space-xl); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); margin-top: var(--space-lg); }
h4 { font-size: clamp(1.125rem, 2vw, 1.375rem); }
h5 { font-size: 1.125rem; }

p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    max-width: 70ch;
}

a {
    color: var(--aurora-cyan);
    text-decoration: none;
    transition: color 0.3s var(--transition-smooth);
}

a:hover {
    color: var(--aurora-blue);
}

ul, ol {
    margin: 0 0 var(--space-md) 0;
    padding-left: var(--space-md);
    color: var(--text-secondary);
}

li {
    margin-bottom: var(--space-xs);
}

/* Layout */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--gutter);
}

.main-content {
    position: relative;
    z-index: 1;
    padding-top: 100px;
}

/* ========================================
   HEADER
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-md) 0;
    background: rgba(5, 5, 8, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s var(--transition-smooth);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

.logo img {
    width: 42px;
    height: 42px;
    border-radius: 10px;
}

.logo-text {
    position: relative;
}

.logo-text::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--aurora-cyan), var(--aurora-violet));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s var(--transition-smooth);
}

.logo:hover .logo-text::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Navigation */
.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 32px;
    height: 32px;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 101;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s var(--transition-smooth);
    transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.nav-overlay {
    position: fixed;
    inset: 0;
    background: var(--void);
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s var(--transition-smooth);
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

.nav-menu {
    list-style: none;
    text-align: center;
    padding: 0;
}

.nav-menu li {
    margin: var(--space-md) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s var(--transition-smooth);
}

.nav-overlay.active .nav-menu li {
    opacity: 1;
    transform: translateY(0);
}

.nav-overlay.active .nav-menu li:nth-child(1) { transition-delay: 0.1s; }
.nav-overlay.active .nav-menu li:nth-child(2) { transition-delay: 0.15s; }
.nav-overlay.active .nav-menu li:nth-child(3) { transition-delay: 0.2s; }
.nav-overlay.active .nav-menu li:nth-child(4) { transition-delay: 0.25s; }
.nav-overlay.active .nav-menu li:nth-child(5) { transition-delay: 0.3s; }
.nav-overlay.active .nav-menu li:nth-child(6) { transition-delay: 0.35s; }
.nav-overlay.active .nav-menu li:nth-child(7) { transition-delay: 0.4s; }

.nav-menu a {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2rem);
    color: var(--text-secondary);
    transition: all 0.3s var(--transition-smooth);
}

.nav-menu a:hover {
    color: var(--aurora-cyan);
    text-shadow: var(--glow-subtle);
}

/* ========================================
   PRODUCT PAGE LAYOUT
   ======================================== */
.product-hero {
    padding: var(--space-lg) 0 var(--space-xl);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-tertiary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-lg);
    transition: color 0.3s var(--transition-smooth);
}

.back-link:hover {
    color: var(--aurora-cyan);
}

.back-link svg {
    width: 16px;
    height: 16px;
}

.product-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--space-xl);
    align-items: start;
}

@media (max-width: 992px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
}

.product-content {
    max-width: 800px;
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(0, 245, 212, 0.1);
    border: 1px solid rgba(0, 245, 212, 0.2);
    border-radius: 50px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--aurora-cyan);
}

/* Text intro */
.text-intro {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

/* Status caption */
.text-caption {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Checkmark list */
.check-list {
    list-style: none;
    padding: 0;
    margin: var(--space-md) 0;
}

.check-list li {
    position: relative;
    padding-left: 1.75rem;
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

.check-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 12px;
    height: 6px;
    border-left: 2px solid var(--aurora-cyan);
    border-bottom: 2px solid var(--aurora-cyan);
    transform: rotate(-45deg);
}

/* Info boxes */
.info-box {
    padding: var(--space-lg);
    border-radius: 12px;
    margin: var(--space-lg) 0;
}

.info-box--highlight {
    background: linear-gradient(135deg, rgba(0, 245, 212, 0.1), rgba(0, 191, 166, 0.05));
    border: 1px solid rgba(0, 245, 212, 0.2);
}

.info-box--dark {
    background: var(--stellar);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.info-box--warning {
    background: rgba(255, 193, 7, 0.1);
    border-left: 4px solid #ffc107;
}

.info-box--success {
    background: rgba(0, 245, 212, 0.05);
    border-left: 4px solid var(--aurora-cyan);
}

.info-box h3, .info-box h4 {
    color: var(--aurora-cyan);
    margin-top: 0;
}

/* Video embed */
.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    margin: var(--space-lg) 0;
    background: var(--stellar);
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Images */
.product-image-block {
    border-radius: 12px;
    overflow: hidden;
    margin: var(--space-lg) 0;
}

.product-image-block img {
    width: 100%;
    height: auto;
    display: block;
}

/* FAQ */
.faq-item {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3, .faq-item h4 {
    color: var(--aurora-cyan);
    margin-bottom: var(--space-sm);
    margin-top: 0;
    font-size: 1.125rem;
}

.faq-item p {
    margin-bottom: 0;
}

/* ========================================
   SIDEBAR
   ======================================== */
.product-sidebar {
    position: sticky;
    top: 120px;
}

@media (max-width: 992px) {
    .product-sidebar {
        position: static;
    }
}

.sidebar-image {
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: var(--space-lg);
    background: var(--stellar);
}

.sidebar-image img {
    width: 100%;
    height: auto;
    display: block;
}

.sidebar-card {
    background: var(--stellar);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
}

.sidebar-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-md);
    margin-top: 0;
}

.sidebar-card--highlight {
    background: linear-gradient(135deg, var(--stellar), var(--nebula));
    border-color: rgba(0, 245, 212, 0.2);
}

.sidebar-card--highlight h3 {
    color: var(--aurora-cyan);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
    width: 100%;
    margin-bottom: var(--space-sm);
}

.btn:last-child {
    margin-bottom: 0;
}

.btn-primary {
    background: linear-gradient(135deg, var(--aurora-cyan), var(--aurora-teal));
    color: var(--void);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 245, 212, 0.3);
    color: var(--void);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--aurora-cyan);
    color: var(--aurora-cyan);
    background: rgba(0, 245, 212, 0.05);
}

.btn-inline {
    width: auto;
    display: inline-flex;
}

/* ========================================
   FEATURE SECTIONS
   ======================================== */
.feature-section {
    padding: var(--space-xl) 0;
    background: var(--nebula);
    margin: var(--space-xl) calc(-1 * var(--gutter));
    padding-left: var(--gutter);
    padding-right: var(--gutter);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.feature-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: var(--space-lg);
    transition: all 0.3s var(--transition-smooth);
}

.feature-card:hover {
    border-color: rgba(0, 245, 212, 0.2);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    color: var(--aurora-cyan);
    font-size: 1.25rem;
    margin-top: 0;
}

.feature-card p {
    color: var(--text-tertiary);
    margin-bottom: 0;
}

/* ========================================
   STATUS SECTION (for Black Hole Finder)
   ======================================== */
.status-section {
    background: linear-gradient(135deg, var(--nebula) 0%, var(--stellar) 100%);
    padding: var(--space-xl) 0;
    margin: var(--space-xl) calc(-1 * var(--gutter));
    padding-left: var(--gutter);
    padding-right: var(--gutter);
    position: relative;
    overflow: hidden;
}

.status-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 245, 212, 0.3), transparent);
}

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

.status-card {
    background: rgba(5, 5, 8, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: var(--space-lg);
    transition: all 0.3s var(--transition-smooth);
}

.status-card:hover {
    border-color: rgba(0, 245, 212, 0.2);
    box-shadow: var(--glow-subtle);
}

/* ========================================
   FOOTER
   ======================================== */
.site-footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: var(--space-2xl);
}

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

.footer-nav {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
    flex-wrap: wrap;
    padding: 0;
    margin: 0;
}

.footer-nav li {
    margin: 0;
}

.footer-nav a {
    font-size: 0.9375rem;
    color: var(--text-tertiary);
}

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

.footer-copy {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   UTILITIES
   ======================================== */
.text-gradient {
    background: linear-gradient(135deg, var(--aurora-cyan), var(--aurora-violet));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-cyan {
    color: var(--aurora-cyan);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Scroll reveal animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s var(--transition-smooth);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Grid utilities */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

/* Spacing */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* Arrow icon */
.arrow-icon {
    width: 16px;
    height: 16px;
}