/* --- VARIABLES & RESET --- */
:root {
    --bg-color: #020202;
    --text-color: #e0e0e0;
    --text-muted: #8f9ba8;
    --accent-color: #8f00ff; 
    --accent-glow: rgba(143, 0, 255, 0.5);
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(10, 10, 12, 0.7);
    --glass-solid: rgba(10, 10, 12, 0.95);
    --error-color: #ff4444;
    --success-color: #00ff88;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    
    /* FIX: Changed height to min-height to allow scrolling on mobile */
    min-height: 100vh;
    
    display: flex;
    flex-direction: column;
    
    /* Ensure scrollbars appear if content overflows (critical for checkout) */
    overflow-y: auto;
    overflow-x: hidden; 
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }

/* --- BACKGROUND FX --- */
.background-fx {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(143, 0, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(143, 0, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
}

.neon-beam {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 100vh;
    background: var(--accent-color);
    box-shadow: 
        0 0 20px 2px var(--accent-color),
        0 0 100px 20px var(--accent-glow),
        0 0 200px 60px rgba(143, 0, 255, 0.15);
    opacity: 0.6;
    transition: transform 0.1s ease-out;
}

.mouse-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(143, 0, 255, 0.1) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s;
}

/* --- HEADER --- */
header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 40px;
    display: flex;
    justify-content: center;
    z-index: 100;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1100px;
    padding: 12px 24px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.logo-icon {
    display: flex;
    gap: 3px;
}
.logo-icon span {
    width: 4px;
    height: 14px;
    background-color: var(--accent-color);
    display: block;
    transform: skewX(-20deg);
}
.logo-icon span:last-child { opacity: 0.5; }

nav ul {
    display: flex;
    gap: 30px;
}

nav a {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

nav a:hover {
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-glow);
}

.header-cta {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 5px;
    border: 1px solid var(--accent-color);
    padding: 8px 16px;
    border-radius: 4px;
    color: var(--accent-color);
    white-space: nowrap;
}
.header-cta:hover { 
    background: var(--accent-color);
    color: #fff;
    box-shadow: 0 0 15px var(--accent-glow);
}

/* --- HERO SECTION --- */
.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    position: relative;
    z-index: 10;
    margin-top: 60px;
    min-height: 100vh;
}

h1 {
    font-size: 4.5rem;
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: -2px;
    margin-bottom: 25px;
    max-width: 1000px;
}

.text-gradient {
    background: linear-gradient(to right, #ffffff 20%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 650px;
    line-height: 1.7;
    margin-bottom: 50px;
}

.hero-desc strong {
    color: #fff;
    font-weight: 500;
}

.tech-ticker {
    margin-top: 50px;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    display: flex;
    gap: 15px;
    opacity: 0.6;
}
.tech-ticker .separator { color: var(--accent-color); }

.btn-group {
    display: flex;
    gap: 20px;
}

/* --- GENERIC BUTTONS --- */
.btn {
    padding: 16px 36px;
    border: 1px solid var(--accent-color);
    background: rgba(143, 0, 255, 0.1);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px; /* Matched to checkout radius */
}

.btn span { position: relative; z-index: 2; }

.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
    background: var(--accent-color);
    transition: width 0.3s ease;
    z-index: 1;
}

.btn:hover::after { width: 100%; }
.btn:hover { box-shadow: 0 0 30px var(--accent-glow); }
.btn:disabled { background: #444; border-color: #444; color: #888; cursor: not-allowed; box-shadow: none; }
.btn:disabled::after { display: none; }

.btn.secondary {
    border-color: var(--border-color);
    background: transparent;
    color: var(--text-muted);
}
.btn.secondary:hover {
    color: #fff;
    border-color: #fff;
    box-shadow: none;
}
.btn.secondary::after { background: #fff; }
.btn.secondary:hover span { color: #000; }

/* ========================================= */
/* --- CHECKOUT PAGE STYLES --- */
/* ========================================= */

.checkout-container {
    background: var(--glass-solid);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 950px;
    
    /* Layout */
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    
    /* FIX: Flexible height logic */
    height: auto; 
    margin: 40px auto; /* Centers it vertically/horizontally */
    align-self: center;
}

/* Ensure body centers the checkout correctly */
body:has(.checkout-container) {
    justify-content: flex-start; /* Allows scrolling down */
    align-items: center; /* Centers horizontally */
    padding: 40px 20px;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(143, 0, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(143, 0, 255, 0.05) 0%, transparent 40%);
}

/* Left Column: Summary */
.summary-col {
    background: rgba(255,255,255,0.02);
    padding: 40px;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.back-link {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 30px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.back-link:hover { color: #fff; }

.plan-tag {
    background: var(--accent-color);
    color: #fff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    align-self: flex-start;
    margin-bottom: 15px;
}

.total-price {
    font-size: 3.5rem;
    font-weight: 800;
    color: #fff;
    margin: 10px 0 30px 0;
    letter-spacing: -1px;
}

.feature-list li {
    margin-bottom: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 10px;
}
.feature-list li span { color: var(--success-color); }

/* Right Column: Payment Form */
.payment-col {
    padding: 40px;
}

.payment-col h2 { margin: 0 0 25px 0; font-size: 1.5rem; }

/* Form Inputs */
.input-group { margin-bottom: 20px; position: relative; }
.input-group label { display: block; margin-bottom: 8px; color: var(--text-muted); font-size: 0.85rem; font-weight: 500; }

.input-group input { 
    width: 100%; 
    padding: 14px; 
    background: rgba(0,0,0,0.3); 
    border: 1px solid var(--border-color); 
    color: #fff; 
    border-radius: 8px; 
    outline: none; 
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input:focus { border-color: var(--accent-color); }
.input-group input.error { border-color: var(--error-color); }
.input-group input.success { border-color: var(--success-color); }

.validation-msg { font-size: 0.75rem; margin-top: 6px; min-height: 14px; display: block; }
.text-error { color: var(--error-color); }
.text-success { color: var(--success-color); }
.text-muted { color: var(--text-muted); }

/* Payment Tabs */
.payment-tabs { display: flex; gap: 10px; margin-bottom: 25px; }
.tab-btn {
    flex: 1; padding: 14px; cursor: pointer; text-align: center;
    background: rgba(255,255,255,0.03); border: 1px solid var(--border-color);
    border-radius: 8px; transition: 0.3s; color: var(--text-muted); font-weight: 600;
}
.tab-btn.active { 
    background: rgba(143, 0, 255, 0.15); 
    color: #fff; 
    border-color: var(--accent-color); 
    box-shadow: 0 0 15px rgba(143, 0, 255, 0.2);
}
.tab-btn:hover:not(.active) { background: rgba(255,255,255,0.08); }

/* Checkout Action Button override */
.payment-col .btn {
    width: 100%;
    margin-top: 10px;
    display: block; /* Ensures full width block behavior */
    text-align: center;
}

/* Crypto Specific & Scaling Fixes */
#crypto-section { display: none; animation: fadeIn 0.3s ease; }

.qr-wrapper {
    background: #fff;
    padding: 15px;
    border-radius: 12px;
    /* FIX: Relative sizing + Max Width + Auto Height */
    width: 100%;
    max-width: 190px;
    height: auto;
    aspect-ratio: 1 / 1; 
    margin: 20px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* FIX: Ensure contents of QR code shrink */
.qr-wrapper img, 
.qr-wrapper canvas {
    max-width: 100% !important;
    height: auto !important;
    display: block;
}

.crypto-address-box {
    font-family: monospace;
    background: rgba(0,0,0,0.4);
    padding: 12px;
    border-radius: 6px;
    border: 1px dashed var(--border-color);
    color: var(--text-muted);
    /* FIX: Break words prevents horizontal scroll bar on mobile */
    word-break: break-all;
    font-size: 0.75rem;
    text-align: center;
    margin-bottom: 10px;
    cursor: pointer;
    transition: 0.2s;
}
.crypto-address-box:hover { border-color: var(--accent-color); color: #fff; }

/* Loaders */
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
.spinner {
    width: 18px; height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top: 2px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* --- RESPONSIVE LAYOUT --- */
@media (max-width: 850px) {
    /* Checkout becomes single column */
    .checkout-container { 
        grid-template-columns: 1fr; 
        max-width: 500px; 
        margin-top: 20px; 
    }
    .summary-col { border-right: none; border-bottom: 1px solid var(--border-color); padding: 30px; }
    .payment-col { padding: 30px; }
    .total-price { font-size: 2.5rem; }
}

@media (max-width: 768px) {
    /* Existing Homepage Mobile Styles */
    header { padding: 12px 10px; }
    .nav-container { padding: 10px 12px; }
    .nav-container nav { display: none; }
    .logo { font-size: 1rem; }
    .header-cta { font-size: 0.65rem; padding: 6px 12px; }
    
    .hero { margin-top: 0; padding-top: 140px; justify-content: flex-start; }
    h1 { font-size: 2.8rem; letter-spacing: -1px; }
    .hero-desc { font-size: 0.95rem; padding: 0 10px; margin-bottom: 40px; }
    
    .btn-group { flex-direction: column; width: 100%; max-width: 300px; gap: 15px; }
    .btn { width: 100%; padding: 14px 20px; }
    
    .tech-ticker { flex-wrap: wrap; justify-content: center; gap: 10px; max-width: 90%; margin-top: 40px; }
    .tech-ticker span { border: 1px solid rgba(255,255,255,0.1); padding: 6px 10px; border-radius: 6px; font-size: 0.65rem; background: rgba(0,0,0,0.4); }
    .tech-ticker .separator { display: none; }
}

/* Plan Selection Cards */
.plan-selector {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
    width: 100%;
}

.plan-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.02);
    transition: all 0.2s ease;
}

.plan-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.plan-card.active {
    border-color: var(--accent-color);
    background: rgba(143, 0, 255, 0.1);
    box-shadow: 0 0 15px rgba(143, 0, 255, 0.15);
}

.plan-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.plan-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
}

.plan-savings {
    font-size: 0.75rem;
    color: var(--success-color);
    font-weight: 500;
}

.plan-price {
    font-weight: 700;
    color: #e0e0e0;
}