:root {
    --bg: #0b1220;
    --surface: rgba(22, 28, 41, 0.86);
    --text-primary: #e8edf7;
    --text-secondary: #b4bed1;
    --text-tertiary: #91a0b8;
    --primary: #8ab4ff;
    --primary-dark: #5a86ff;
    --border: rgba(140, 155, 185, 0.22);
    --border-strong: rgba(180, 195, 225, 0.45);
    --shadow: rgba(5, 8, 19, 0.5);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.18);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.24);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.32);
    --glass: rgba(22, 28, 41, 0.6);
    --glass-deep: rgba(16, 21, 33, 0.65);
    --glass-border: rgba(189, 200, 226, 0.14);
    --ring: #6da2ff;
    --ring-soft: rgba(109, 162, 255, 0.25);
    --accent-gradient: linear-gradient(135deg, #6da2ff 0%, #9e7bff 100%);
    --on-accent: #0e1220;
    --radius-xl: 14px;
    --radius-2xl: 18px;
    --radius-3xl: 22px;
    --space-1: 6px;
    --space-2: 10px;
    --space-3: 16px;
    --space-4: 22px;
    --space-5: 28px;
    --logo-size: 44px;
}

* {
    box-sizing: border-box;
}

html {
    font-size: clamp(14px, 14px + 0.25vw, 18px);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background:
        radial-gradient(1200px 800px at 10% -10%, rgba(64, 87, 255, 0.16), transparent 50%),
        radial-gradient(1000px 700px at 110% 10%, rgba(156, 86, 255, 0.16), transparent 50%),
        var(--bg);
    background-repeat: no-repeat, no-repeat, no-repeat;
    background-attachment: scroll, scroll, scroll;
    background-position: 0 0, 0 0, 0 0;
    background-size: 120% 120%, 120% 120%, auto;
    color: var(--text-primary);
    font-family: "IBM Plex Sans", "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1360px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 76px 0;
}

.muted {
    color: var(--text-secondary);
}

.sm {
    font-size: 0.9rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: linear-gradient(180deg, rgba(11,18,32,.8), rgba(11,18,32,.6));
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    width: var(--logo-size);
    height: var(--logo-size);
    border-radius: 50%;
}

.wordmark {
    font-weight: 700;
    letter-spacing: .5px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 14px;
    position: relative;
}

.menu-wrap {
    position: relative;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 10px;
    border-radius: 10px;
    background: transparent;
    border: none;
    font: inherit;
    cursor: pointer;
}

.nav-link:hover {
    background: rgba(255,255,255,.05);
    color: var(--text-primary);
}

.nav-link:visited {
    color: var(--text-secondary);
}

.nav-link.has-menu {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 260px;
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
    transition: opacity .16s ease, transform .16s ease;
    z-index: 100;
}

.menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.menu a {
    display: block;
    padding: 10px 12px;
    border-radius: 10px;
    color: var(--text-primary);
    text-decoration: none;
}

.menu a:hover {
    background: rgba(255,255,255,.06);
}

.nav-link.disabled {
    opacity: .5;
    pointer-events: none;
}

.hero {
    padding: 100px 0 52px;
}

.hero h1 {
    font-size: clamp(28px, 3.8vw, 48px);
    line-height: 1.15;
    margin: 0 0 12px;
}

.lead {
    color: var(--text-secondary);
    max-width: 880px;
    margin: 0 0 26px;
}

.cta-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--glass);
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    transition: .2s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn.btn-lg {
    padding: 14px 18px;
    border-radius: 14px;
    font-weight: 600;
}

.btn.primary {
    border-color: transparent;
    background: var(--accent-gradient);
    color: var(--on-accent);
}

.btn.ghost {
    background: transparent;
}

.btn[disabled],
.btn.disabled {
    opacity: .5;
    pointer-events: none;
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1.15fr 1.35fr;
    gap: 22px;
    align-items: start;
    margin-top: 24px;
}

.code-panel {
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.code-tabs {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(22, 28, 41, 0.66);
}

.tab {
    appearance: none;
    border: 1px solid var(--glass-border);
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
}

.tab:hover {
    background: rgba(255,255,255,0.08);
}

.tab.active {
    border-color: transparent;
    background: var(--accent-gradient);
    color: var(--on-accent);
}

.copy-btn {
    margin-left: auto;
    border: 1px solid var(--glass-border);
    background: rgba(255,255,255,0.04);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 10px;
    cursor: pointer;
}

.copy-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.08);
}

.code {
    margin: 0;
    padding: 20px;
    max-height: 520px;
    overflow-y: auto;
    overflow-x: hidden;
    white-space: pre-wrap;
    word-break: break-word;
    overflow-wrap: anywhere;
    tab-size: 4;
    font: 500 0.94rem/1.6 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    color: var(--text-primary);
}

.table-wrap {
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    background: linear-gradient(180deg, rgba(22, 28, 41, .9), rgba(22, 28, 41, .7));
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.price-table {
    width: 100%;
    border-collapse: collapse;
}

.price-table thead th {
    text-align: left;
    padding: 16px;
    font-weight: 700;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.price-table thead .th-sub {
    display: block;
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.price-table tbody td {
    padding: 16px;
    border-bottom: 1px solid var(--glass-border);
    vertical-align: middle;
}

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

.model {
    display: flex;
    align-items: center;
    gap: 12px;
}

.model-icon {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--accent-gradient);
    box-shadow: 0 0 0 2px rgba(255,255,255,.06);
}

.model-meta .name {
    font-weight: 700;
}

.model-meta .provider {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    margin-top: 2px;
}

.cell-price .price {
    font-weight: 700;
}

.faq {
    display: grid;
    gap: 10px;
    margin-top: 12px;
}

details {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 10px 14px;
    overflow: hidden;
}

summary {
    cursor: pointer;
    font-weight: 600;
    outline: none;
}

details[open] {
    box-shadow: var(--shadow-sm);
}

details p {
    margin: 8px 0 0;
    color: var(--text-secondary);
}

.faq .faq-body {
    height: 0;
    overflow: hidden;
    opacity: 0;
}

.site-footer {
    margin-top: 42px;
    padding: 28px 0;
    border-top: 1px solid var(--border);
    background: linear-gradient(0deg, rgba(11,18,32,.95), rgba(11,18,32,.75));
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 18px;
    align-items: center;
}

.footer-brand .footer-links {
    display: flex;
    gap: 14px;
    margin: 10px 0;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer-link:visited {
    color: var(--text-secondary);
}

.footer-link:hover {
    color: var(--text-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    justify-content: flex-end;
}

.footer-meta .muted {
    text-decoration: none;
}

.footer-meta .disabled {
    pointer-events: none;
    opacity: .6;
}

.scroll-top {
    position: fixed;
    right: 20px;
    bottom: 24px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease;
    z-index: 50;
}

.scroll-top i {
    font-size: 28px;
    line-height: 1;
}

.scroll-top.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.scroll-top:active {
    transform: translateY(1px);
}

.img-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 22px;
    margin-top: 16px;
}

.img-model-title {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(22, 28, 41, 0.66);
}

@media (max-width: 1150px) {
    .pricing-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .site-header .container {
        height: auto;
        padding: 10px 24px;
        flex-wrap: wrap;
        gap: 10px;
    }
    .main-nav {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
    }
    .price-table thead .th-sub {
        display: none;
    }
    .scroll-top {
        width: 46px;
        height: 46px;
        right: 16px;
        bottom: 18px;
    }
    .scroll-top i {
        font-size: 24px;
    }
}

@media (max-width: 560px), (hover: none) {
    body {
        background: var(--bg);
        background-repeat: no-repeat;
        background-attachment: scroll;
    }
}