:root {
    --blue: #1677ff;
    --blue-dark: #0757bf;
    --orange: #ff8a00;
    --ink: #162033;
    --muted: #697386;
    --line: #e5ebf3;
    --soft: #f5f8fc;
    --card: #ffffff;
    --shadow: 0 18px 46px rgba(31, 45, 61, 0.10);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
    background:
        radial-gradient(circle at 8% 0, rgba(22, 119, 255, 0.14), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, #eef4fb 320px, #f6f8fb 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    border-bottom: 1px solid rgba(229, 235, 243, 0.8);
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
}

.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 18px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 21px;
    font-weight: 800;
}

.logo-mark {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    color: #fff;
    background: linear-gradient(135deg, var(--blue), #39b6ff);
    border-radius: 12px;
}

.top-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.top-links a {
    padding: 7px 12px;
    color: var(--muted);
    border-radius: 999px;
}

.top-links a:hover {
    color: var(--blue);
    background: #eef6ff;
}

main {
    max-width: 1180px;
    margin: 0 auto;
    padding: 34px 18px 64px;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
    gap: 24px;
    align-items: stretch;
}

.hero-card,
.search-card,
.notice,
.category-section,
.install-hint {
    border: 1px solid rgba(229, 235, 243, 0.92);
    background: rgba(255, 255, 255, 0.92);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.hero-card {
    padding: 38px;
    overflow: hidden;
    background:
        linear-gradient(145deg, rgba(22, 119, 255, 0.95), rgba(8, 69, 160, 0.96)),
        var(--blue);
    color: #fff;
}

.hero-card h1 {
    margin: 8px 0 14px;
    font-size: clamp(34px, 6vw, 64px);
    line-height: 1.02;
}

.hero-card p {
    max-width: 520px;
    margin: 0;
    color: rgba(255, 255, 255, 0.84);
    line-height: 1.8;
}

.eyebrow {
    margin: 0;
    color: var(--orange);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.hero-card .eyebrow {
    color: #ffe0a3;
}

.secondary-link {
    display: inline-flex;
    margin-top: 22px;
    padding: 10px 18px;
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 999px;
}

.search-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 30px;
}

.engine-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.engine-tabs button {
    cursor: pointer;
    padding: 9px 16px;
    color: var(--muted);
    background: var(--soft);
    border: 1px solid var(--line);
    border-radius: 999px;
}

.engine-tabs button.active {
    color: #fff;
    background: var(--blue);
    border-color: var(--blue);
}

.search-box {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
}

.search-box span {
    grid-column: 1 / -1;
    color: var(--muted);
    font-size: 14px;
}

.search-box input {
    min-height: 54px;
    padding: 0 18px;
    font-size: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    outline: none;
}

.search-box input:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 4px rgba(22, 119, 255, 0.12);
}

.search-box button,
.primary-btn {
    cursor: pointer;
    min-height: 54px;
    padding: 0 24px;
    color: #fff;
    font-weight: 800;
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    border: 0;
    border-radius: 16px;
}

.notice {
    display: flex;
    gap: 14px;
    align-items: center;
    margin-top: 22px;
    padding: 16px 20px;
}

.notice strong {
    color: var(--blue);
}

.notice span {
    color: var(--muted);
}

.category-section {
    margin-top: 24px;
    padding: 26px;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 20px;
}

.section-heading h2 {
    margin: 4px 0 0;
    font-size: 26px;
}

.section-heading span {
    color: var(--muted);
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.site-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 78px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.site-card:hover {
    transform: translateY(-3px);
    border-color: rgba(22, 119, 255, 0.35);
    box-shadow: 0 12px 28px rgba(22, 119, 255, 0.12);
}

.site-card.hot::after {
    content: "HOT";
    position: absolute;
    top: 10px;
    right: 10px;
    color: #fff;
    font-size: 10px;
    font-weight: 800;
    background: var(--orange);
    border-radius: 999px;
    padding: 2px 6px;
}

.site-icon {
    display: grid;
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    place-items: center;
    color: var(--blue);
    font-weight: 800;
    background: #eef6ff;
    border-radius: 14px;
}

.site-icon img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.site-card strong,
.site-card small {
    display: block;
}

.site-card small {
    margin-top: 4px;
    color: var(--muted);
    font-size: 12px;
}

.footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
    padding: 28px 18px 42px;
    color: var(--muted);
    font-size: 14px;
}

.install-hint-page {
    display: grid;
    min-height: 100vh;
    place-items: center;
}

.install-hint {
    width: min(92vw, 560px);
    padding: 34px;
    text-align: center;
}

.install-hint p {
    color: var(--muted);
}

.install-hint .primary-btn {
    display: inline-flex;
    align-items: center;
    margin: 12px 0;
}

@media (max-width: 900px) {
    .hero,
    .search-box {
        grid-template-columns: 1fr;
    }

    .link-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 620px) {
    .topbar-inner,
    .section-heading,
    .notice {
        align-items: flex-start;
        flex-direction: column;
    }

    .top-links {
        width: 100%;
    }

    .hero-card,
    .search-card,
    .category-section {
        padding: 22px;
        border-radius: 18px;
    }

    .link-grid {
        grid-template-columns: 1fr;
    }
}