@charset "UTF-8";
/* ==========================================================================
   双 ISP DIA（家庭 IP）服务器专题
   dia.xiumiyun.com
   ========================================================================== */
.dia-page {
    background: var(--c-bg-elevated);
}
/* 主站 .page-wrapper 默认带灰底，这里改为与内容一致的白底，避免内容区发灰 */
.dia-page .page-wrapper {
    background: var(--c-bg-elevated);
}
.dia-main {
    flex: 1;
    padding-bottom: 72px;
}
.dia-wrap {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.dia-hero {
    padding: 56px 0 44px;
    background: var(--c-bg-elevated);
    border-bottom: 1px solid var(--c-line);
}
.dia-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: 48px;
    align-items: center;
}
.dia-hero-visual {
    position: relative;
    justify-self: end;
    width: 100%;
    max-width: 380px;
}
/* 右侧点阵装饰：让留白更像“网络身份”的视觉注脚，不喧宾夺主 */
.dia-hero-visual::before {
    content: "";
    position: absolute;
    inset: -38px -30px;
    background-image: radial-gradient(circle, rgba(100, 116, 139, .28) 1px, transparent 1px);
    background-size: 15px 15px;
    -webkit-mask-image: radial-gradient(70% 70% at 50% 50%, #000 0%, transparent 100%);
    mask-image: radial-gradient(70% 70% at 50% 50%, #000 0%, transparent 100%);
    pointer-events: none;
}
.dia-hero-visual .dia-ipcard {
    position: relative;
    z-index: 1;
}
.dia-eyebrow {
    margin: 0 0 16px;
    font-size: var(--fs-xs);
    font-weight: 500;
    letter-spacing: .1em;
    color: var(--c-text-3);
    text-transform: uppercase;
}
.dia-eyebrow i {
    margin-right: 7px;
    color: var(--c-action);
}
.dia-hero-title {
    margin: 0 0 16px;
    max-width: 900px;
    font-size: clamp(1.85rem, 3.4vw, 2.5rem);
    font-weight: var(--fw-bold);
    line-height: 1.28;
    letter-spacing: -.02em;
    color: var(--c-text);
}
.dia-hero-desc {
    margin: 0;
    max-width: 620px;
    font-size: var(--fs-md);
    line-height: 1.9;
    color: var(--c-text-2);
}
.dia-hero-desc p {
    margin: 0 0 12px;
}
.dia-hero-desc p:last-child {
    margin-bottom: 0;
}
.dia-hero-desc .dia-prose-note {
    margin-top: 14px !important;
}

/* ==========================================================================
   按钮
   ========================================================================== */
.dia-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 42px;
    padding: 0 20px;
    font-size: 0.875rem;
    font-weight: var(--fw-semibold);
    color: var(--c-text);
    background: var(--c-bg-elevated);
    border: 1px solid var(--c-line-strong);
    border-radius: var(--r-sm);
    transition: background-color var(--ease), border-color var(--ease), color var(--ease);
}
.dia-btn:hover {
    color: var(--c-text);
    background: var(--c-primary-soft);
    border-color: var(--c-primary);
}
.dia-btn--primary {
    color: var(--c-bg);
    background: var(--c-primary);
    border-color: var(--c-primary);
}
.dia-btn--primary:hover {
    color: var(--c-bg);
    background: var(--c-primary-h);
    border-color: var(--c-primary-h);
}
.dia-btn--primary i {
    font-size: 12px;
}
.dia-btn--sm {
    height: 32px;
    padding: 0 13px;
    font-size: 0.8125rem;
}

/* ==========================================================================
   区块通用
   ========================================================================== */
.dia-sec {
    padding-top: 56px;
}
.dia-sec-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 26px;
    position: relative;
    padding-bottom: 12px;
}
/* 红色斜角强调线：整个标题行底部 */
.dia-sec-head::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 56px;
    height: 3px;
    background: #f44336;
    clip-path: polygon(0 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
}
/* 数字 tag：45° 斜切平行四边形，深色底白字 */
.dia-sec-num {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 5px 14px;
    background: #f44336;
    clip-path: polygon(16px 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
    font-size: 14px;
    font-weight: 700;
    line-height: 1;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color: #fff;
    letter-spacing: .06em;
}
.dia-sec-head > div {
    display: flex;
    align-items: baseline;
    gap: 14px;
    flex-wrap: wrap;
}
.dia-sec-head h2 {
    margin: 0;
    font-size: var(--fs-2xl);
    font-weight: var(--fw-semibold);
    line-height: 1.35;
    letter-spacing: -.01em;
    color: var(--c-text);
}
.dia-sec-head p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--c-text-3);
}
.dia-prose p {
    margin: 0 0 1em;
    font-size: var(--fs-md);
    line-height: 1.95;
    color: var(--c-text-2);
}
.dia-prose p:last-child {
    margin-bottom: 0;
}
.dia-prose--wide {
    max-width: 900px;
}
.dia-prose-note {
    margin: 18px 0 0 !important;
    padding-left: 12px;
    font-size: var(--fs-sm) !important;
    line-height: 1.8;
    color: var(--c-text-3) !important;
    border-left: 2px solid var(--c-line-strong);
}

/* ==========================================================================
   01 什么是双 ISP
   ========================================================================== */

.dia-ipcard {
    padding: 22px 24px;
    background: var(--c-bg-elevated);
    border: 1px solid var(--c-line);
    border-radius: var(--r-sm);
}
.dia-ipcard-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
    font-size: var(--fs-xs);
    letter-spacing: .06em;
    color: var(--c-text-3);
}
.dia-ipcard-badge {
    padding: 2px 8px;
    font-size: 11px;
    letter-spacing: .08em;
    color: var(--c-action);
    border: 1px solid rgba(var(--c-action-rgb), .45);
    border-radius: 3px;
}
.dia-ipcard-ip {
    margin: 0 0 16px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: var(--fs-base);
    color: var(--c-text);
}
.dia-ipcard-list {
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--c-line);
}
.dia-ipcard-list > div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    padding: 10px 0;
    border-bottom: 1px solid var(--c-line);
}
.dia-ipcard-list dt {
    font-size: var(--fs-sm);
    font-weight: var(--fw-normal);
    color: var(--c-text-3);
}
.dia-ipcard-list dd {
    margin: 0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: var(--fs-base);
    color: var(--c-text);
    text-align: right;
}
.dia-ipcard-flag {
    color: var(--c-action) !important;
}
.dia-ipcard-note {
    margin: 14px 0 0;
    font-size: var(--fs-sm);
    color: var(--c-text-3);
}

/* ==========================================================================
   02 对比
   ========================================================================== */
.dia-compare {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-top: 24px;
}
.dia-compare-item {
    padding: 18px 20px;
    background: transparent;
    border: 1px solid var(--c-line);
    border-radius: var(--r-sm);
}
.dia-compare-item--good {
    background: transparent;
    border-color: var(--c-line-strong);
}
.dia-compare-item--good .dia-compare-label {
    color: var(--c-action);
}
.dia-compare-label {
    display: block;
    margin-bottom: 6px;
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    color: var(--c-text);
}
.dia-compare-item p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--c-text-3);
}

/* ==========================================================================
   03 优势
   ========================================================================== */
.dia-features {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
}
.dia-features article {
    padding: 20px 0;
    border-top: 1px solid var(--c-line);
}
.dia-feature-icon {
    margin-right: 10px;
    font-size: 16px;
    color: var(--c-action);
}
.dia-features h3 {
    display: flex;
    align-items: center;
    margin: 0 0 8px;
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    line-height: 1.5;
    color: var(--c-text);
}
.dia-features p {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.9;
    color: var(--c-text-2);
}

/* ==========================================================================
   04 场景
   ========================================================================== */
.dia-scenes {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}
.dia-scene {
    padding: 20px;
    background: var(--c-bg-elevated);
    border: 1px solid var(--c-line);
    border-radius: var(--r-sm);
}
.dia-scene h3 {
    display: flex;
    align-items: center;
    margin: 0 0 8px;
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    color: var(--c-text);
}
.dia-scene h3 i {
    margin-right: 10px;
    font-size: 16px;
    color: var(--c-action);
}
.dia-scene p {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.85;
    color: var(--c-text-2);
}

/* ==========================================================================
   05 产品
   ========================================================================== */
.dia-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 28px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--c-line);
}
.dia-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: -1px;
    padding: 0 0 12px;
    font-size: var(--fs-md);
    color: var(--c-text-3);
    background: none;
    border: 0;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: color var(--ease), border-color var(--ease);
}
.dia-tab:hover {
    color: var(--c-text);
}
.dia-tab.is-active {
    color: var(--c-text);
    border-bottom-color: var(--c-action);
}
.dia-tab-count {
    font-size: 11px;
    color: var(--c-text-3);
}
.dia-panel {
    display: none;
}
.dia-panel.is-active {
    display: block;
}
.dia-products {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    align-items: start;
}
.dia-note {
    margin: 18px 0 0;
    font-size: var(--fs-sm);
    color: var(--c-text-3);
}

/* ==========================================================================
   06 常见问题
   ========================================================================== */
.dia-faq {
    border-top: 1px solid var(--c-line);
}
.dia-faq details {
    border-bottom: 1px solid var(--c-line);
}
.dia-faq summary {
    position: relative;
    padding: 18px 34px 18px 0;
    font-size: var(--fs-md);
    font-weight: var(--fw-medium);
    line-height: 1.6;
    color: var(--c-text);
    cursor: pointer;
    list-style: none;
}
.dia-faq summary::-webkit-details-marker {
    display: none;
}
.dia-faq summary::after {
    content: "+";
    position: absolute;
    top: 50%;
    right: 2px;
    transform: translateY(-50%);
    font-size: 18px;
    font-weight: 400;
    color: var(--c-text-3);
}
.dia-faq details[open] summary::after {
    content: "−";
}
.dia-faq .help-faq-answer {
    max-width: 920px;
    padding: 0 0 18px;
    font-size: var(--fs-base);
    line-height: 1.95;
    color: var(--c-text-2);
}

/* ==========================================================================
   底部咨询
   ========================================================================== */

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
    .dia-hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .dia-hero-visual {
        justify-self: start;
        max-width: 420px;
    }
    .dia-products {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .dia-scenes {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
@media (max-width: 767px) {
    .dia-hero {
        padding: 40px 0 30px;
    }
    /* 主站右下角客服悬浮条会压到较矮的页脚，移动端留出底部安全空间 */
    .dia-page .site-footer {
        padding-bottom: 72px;
    }
    .dia-features {
        grid-template-columns: 1fr;
        column-gap: 0;
    }
    .dia-compare {
        grid-template-columns: 1fr;
    }
    .dia-products {
        grid-template-columns: 1fr;
    }
    .dia-tabs {
        gap: 20px;
    }
    .dia-sec {
        padding-top: 44px;
    }
    .dia-sec-head h2 {
        font-size: 1.3rem;
    }
@media (max-width: 640px) {
    .dia-wrap {
        padding: 0 18px;
    }
    .dia-hero-visual {
        max-width: 100%;
    }
    .dia-hero-visual::before {
        inset: -26px -18px;
    }
    .dia-scenes {
        grid-template-columns: 1fr;
    }
}