:root {
    --bg: #0d1117;
    --bg2: #161b22;
    --bg3: #1c2333;
    --border: #30363d;
    --text: #c9d1d9;
    --text-dim: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --green: #3fb950;
    --red: #f85149;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

.credit-banner {
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.4px;
    color: var(--red);
    padding: 6px 0;
    animation: creditGlow 2.2s ease-in-out infinite;
}

@keyframes creditGlow {
    0%, 100% { text-shadow: 0 0 4px rgba(248, 81, 73, 0.35); opacity: 0.8; }
    50% { text-shadow: 0 0 10px rgba(248, 81, 73, 0.85); opacity: 1; }
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
}

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

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent);
}

nav a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 14px;
    margin-left: 24px;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--text);
}

.hero {
    padding: 80px 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 42px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 16px;
    color: #fff;
}

.hero p {
    font-size: 18px;
    color: var(--text-dim);
    max-width: 560px;
    margin: 0 auto 36px;
}

.hero .price {
    display: inline-flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 32px;
    font-size: 15px;
    color: var(--text-dim);
}

.hero .price strong {
    font-size: 32px;
    color: #fff;
    font-weight: 700;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-family: var(--font);
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg3);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.section {
    padding: 60px 0;
}

.section-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: #fff;
}

.section-sub {
    color: var(--text-dim);
    margin-bottom: 40px;
    font-size: 15px;
}

.features-box {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 20px;
    max-width: 560px;
    margin: 0 auto;
}

.feature-row {
    display: flex;
    gap: 16px;
    align-items: baseline;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.feature-row:last-child {
    border-bottom: none;
}

.feature-row-title {
    flex: 0 0 110px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
}

.feature-row-desc {
    flex: 1;
    font-size: 12px;
    color: var(--text-dim);
    line-height: 1.5;
}

.badge-unavailable {
    display: inline-block;
    margin-left: 6px;
    font-size: 11px;
    font-weight: 600;
    color: var(--red);
    background: rgba(248, 81, 73, 0.12);
    border-radius: 6px;
    padding: 2px 8px;
    vertical-align: middle;
}

.purchase-form {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    max-width: 480px;
    margin: 0 auto;
}

.purchase-form h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    color: #fff;
}

.purchase-form .sub {
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    font-family: var(--font);
    outline: none;
    transition: border-color 0.2s;
}

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

.form-group .hint {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 4px;
}

.success-box {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    max-width: 520px;
    margin: 40px auto;
    text-align: center;
}

.success-box .check {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(63, 185, 80, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 22px;
    color: var(--green);
}

.success-box h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #fff;
}

.success-box p {
    font-size: 14px;
    color: var(--text-dim);
    margin-bottom: 20px;
}

.key-display {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 18px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 15px;
    color: var(--accent);
    letter-spacing: 1px;
    margin-bottom: 24px;
    user-select: all;
    word-break: break-all;
}

.error-box {
    border-color: var(--red);
}

.error-box .check {
    background: rgba(248, 81, 73, 0.15);
    color: var(--red);
}

footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
    text-align: center;
    color: var(--text-dim);
    font-size: 13px;
}

.about-line {
    margin-top: 10px;
    font-size: 11px;
    color: var(--text-dim);
    opacity: 0.7;
}

@media (max-width: 768px) {
    .features-box {
        padding: 0 20px;
    }

    .feature-row {
        flex-direction: column;
        gap: 6px;
    }

    .feature-row-title {
        flex-basis: auto;
    }

    .hero h1 {
        font-size: 32px;
    }
}