/* aihub 官网样式:深色科技风,单文件,无外部依赖。 */
:root {
    --bg: #0b0f14;
    --panel: #121821;
    --card: #161e2a;
    --border: #22303f;
    --text: #e8edf2;
    --muted: #8a97a6;
    --accent: #35c2a0;
    --accent-2: #4f8ef7;
    --danger: #e5484d;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
    line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }

/* nav */
.nav {
    display: flex; justify-content: space-between; align-items: center;
    padding: 18px 32px;
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; background: rgba(11, 15, 20, .85); backdrop-filter: blur(12px);
    z-index: 10;
}
.brand { font-size: 20px; font-weight: 700; color: var(--text); letter-spacing: .5px; }
.brand span { color: var(--accent); }
.nav nav { display: flex; gap: 20px; align-items: center; }
.nav nav a:not(.btn) { color: var(--muted); }
.nav nav a:not(.btn):hover { color: var(--text); }

/* buttons */
.btn {
    display: inline-block; padding: 10px 22px; border-radius: 10px;
    font-size: 15px; font-weight: 600; border: 1px solid transparent; cursor: pointer;
    transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { transform: translateY(-1px); opacity: .92; }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; }
.btn.ghost { border-color: var(--border); color: var(--text); background: transparent; }
.btn.danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn.sm { padding: 6px 14px; font-size: 13px; }
.btn.block { display: block; width: 100%; text-align: center; }

/* hero */
.hero { text-align: center; padding: 96px 24px 64px; }
.hero h1 {
    font-size: clamp(32px, 5vw, 56px); margin: 0 0 16px; letter-spacing: -1px;
    background: linear-gradient(135deg, #fff, #9fc3ff);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub { max-width: 640px; margin: 0 auto 32px; color: var(--muted); font-size: 18px; }
.cta { display: flex; gap: 16px; justify-content: center; }

/* features */
.features {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px; padding: 32px; max-width: 1080px; margin: 0 auto;
}
.feature { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 24px; }
.feature h3 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* pricing */
.pricing { text-align: center; padding: 48px 24px 80px; }
.pricing h2 { font-size: 32px; margin: 0 0 32px; }
.cards { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.card {
    background: var(--card); border: 1px solid var(--border); border-radius: 16px;
    padding: 28px; width: 280px; text-align: center;
}
.card.highlight { border-color: var(--accent); box-shadow: 0 0 40px rgba(53, 194, 160, .12); }
.card h3 { margin: 0 0 12px; }
.price { font-size: 38px; font-weight: 700; margin-bottom: 16px; }
.price span { font-size: 14px; color: var(--muted); font-weight: 400; }
.card ul { list-style: none; padding: 0; margin: 0 0 20px; color: var(--muted); font-size: 14px; }
.card li { padding: 4px 0; }
.note { color: var(--muted); font-size: 13px; }

/* auth */
.auth-card {
    max-width: 400px; margin: 80px auto; background: var(--card);
    border: 1px solid var(--border); border-radius: 16px; padding: 32px;
}
.auth-card h1 { margin: 0 0 8px; font-size: 24px; }
.auth-card .sub { color: var(--muted); font-size: 14px; margin: 0 0 20px; }
.auth-card label { display: block; margin-bottom: 16px; font-size: 14px; color: var(--muted); }
.auth-card input {
    display: block; width: 100%; margin-top: 6px; padding: 11px 14px;
    background: var(--bg); color: var(--text); border: 1px solid var(--border);
    border-radius: 10px; font-size: 15px;
}
.auth-card input:focus { outline: 2px solid var(--accent-2); border-color: transparent; }
.auth-card .alt { text-align: center; color: var(--muted); font-size: 14px; margin-top: 20px; }
.error {
    background: rgba(229, 72, 77, .12); border: 1px solid var(--danger);
    color: #ff8f93; border-radius: 10px; padding: 10px 14px; font-size: 14px;
}

/* account */
.account { max-width: 860px; margin: 40px auto; padding: 0 24px; }
.account h1 { font-size: 28px; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px; margin-bottom: 24px; }
.panel h2 { font-size: 18px; margin: 0 0 16px; }
.status { font-size: 15px; }
.status.ok { color: var(--accent); }
.status.warn { color: #f5a623; }
.account .cards { justify-content: flex-start; }
.devices { width: 100%; border-collapse: collapse; font-size: 14px; }
.devices th, .devices td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.devices th { color: var(--muted); font-weight: 500; }
.inline-form { display: inline; }

/* footer */
.footer { text-align: center; padding: 32px; color: var(--muted); border-top: 1px solid var(--border); }

main { min-height: calc(100vh - 200px); }