:root {
    --bg: #0b1220;
    --bg-alt: #101a2e;
    --text: #d7e1f0;
    --text-dim: #9cb0cc;
    --brand: #4f8cff;
    --brand-strong: #2f6fea;
    --card: #131f35;
    --border: #22395f;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
}

.container {
    width: min(1080px, 92%);
    margin: 0 auto;
}

.hero {
    background: linear-gradient(180deg, #0d1628 0%, #111d34 100%);
    border-bottom: 1px solid var(--border);
    padding: 20px 0 44px;
}

.hero-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}

.logo {
    color: #b8cdff;
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
}

.hero-nav a {
    color: var(--text-dim);
    text-decoration: none;
    margin-left: 14px;
    font-size: 14px;
}

.hero h1 {
    margin: 0 0 12px;
    font-size: clamp(28px, 4.2vw, 42px);
    line-height: 1.2;
}

.hero p {
    margin: 0 0 24px;
    color: var(--text-dim);
    max-width: 760px;
}

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

.hero-points {
    margin: 18px 0 0;
    padding-left: 20px;
    color: var(--text-dim);
}

.hero-points li + li {
    margin-top: 6px;
}

.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}

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

.btn-primary:hover {
    background: var(--brand-strong);
}

.btn-secondary {
    color: #b7cae8;
    border: 1px solid #3b5279;
    background: rgba(24, 35, 57, 0.66);
}

.section {
    padding: 52px 0;
}

.section-alt {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.demo-intro {
    margin: 0 0 14px;
    color: var(--text-dim);
    max-width: 820px;
}

.demo-frame-wrap {
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: #0b1220;
    margin-bottom: 14px;
}

.demo-frame-wrap iframe {
    width: 100%;
    min-height: 660px;
    border: 0;
    display: block;
    background: #0b1220;
}

.section h2 {
    margin: 0 0 22px;
    font-size: 28px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.card {
    border: 1px solid var(--border);
    background: var(--card);
    border-radius: 10px;
    padding: 18px;
}

.card h3 {
    margin: 0 0 10px;
    font-size: 18px;
}

.card p {
    margin: 0;
    color: var(--text-dim);
}

.metric-card {
    background: linear-gradient(180deg, rgba(24, 39, 66, 0.92) 0%, rgba(20, 33, 57, 0.92) 100%);
}

.feature-list {
    margin: 0;
    padding-left: 20px;
    color: var(--text-dim);
}

.feature-list li + li {
    margin-top: 8px;
}

.faq-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--card);
    padding: 18px;
}

.faq-item h3 {
    margin: 0 0 10px;
    font-size: 18px;
}

.faq-item p {
    margin: 0;
    color: var(--text-dim);
}

.insight-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.insight-card h3 a {
    color: #c8daff;
    text-decoration: none;
}

.insight-detail {
    line-height: 1.8;
    padding: 24px;
}

.insight-detail section {
    margin: 0 0 22px;
}

.insight-detail img {
    width: 100%;
    max-width: 100%;
    display: block;
    margin: 10px 0 0;
    border-radius: 10px;
}

.insight-detail h2,
.insight-detail h3 {
    margin: 16px 0 10px;
}

.insight-detail p,
.insight-detail li {
    font-size: 16px;
}

@media (min-width: 1180px) {
    .container {
        width: min(1240px, 94%);
    }
}

.admin-panel {
    background: linear-gradient(180deg, rgba(18, 31, 52, 0.95) 0%, rgba(15, 24, 40, 0.95) 100%);
}

.admin-list p {
    margin: 8px 0;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(20, 34, 56, 0.72);
}

.admin-list button {
    margin-left: 6px;
    border: 1px solid #36517d;
    background: #1b2b47;
    color: #d5e2f4;
    border-radius: 6px;
    padding: 4px 8px;
    cursor: pointer;
}

.admin-list a {
    margin-left: 8px;
    color: #8eb3ff;
}

.editor-wrap {
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    background: rgba(14, 24, 41, 0.9);
}

.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px;
    border-bottom: 1px solid var(--border);
}

.editor-toolbar button {
    border: 1px solid #37547f;
    background: #1c2f4e;
    color: #d8e6f8;
    border-radius: 6px;
    padding: 5px 9px;
    cursor: pointer;
}

.editor-area {
    min-height: 280px;
    padding: 14px;
    outline: none;
    color: #dce7f8;
    line-height: 1.75;
}

.section-cta {
    border-top: 1px solid var(--border);
}

.section-cta p {
    margin: 0 0 18px;
    color: var(--text-dim);
    max-width: 720px;
}

.footer {
    border-top: 1px solid var(--border);
    padding: 24px 0 28px;
    color: #8da2c2;
    font-size: 13px;
}

.footer p {
    margin: 0;
}

.footer p + p {
    margin-top: 8px;
}

@media (max-width: 760px) {
    .hero-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-nav a {
        margin-left: 0;
        margin-right: 14px;
    }

    .demo-frame-wrap iframe {
        min-height: 520px;
    }
}