/* 51极旺科技博客 51jiwang.com — 信息密度科技博客 */

:root {
  --ink: #142028;
  --ink-soft: #4a5a66;
  --paper: #e6eaee;
  --paper-deep: #d4dae0;
  --surface: #f0f3f6;
  --line: #c5ced6;
  --jw: #1f7a7c;
  --jw-deep: #0f1c24;
  --accent: #2a9d9f;
  --amber: #c47a2c;
  --mist: #6b7a85;
  --white: #ffffff;
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 1120px;
  --radius: 2px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--jw);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
a:hover { color: var(--accent); }

.site-wrap { overflow-x: hidden; }

.container-jw {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}
@media (max-width: 575.98px) {
  .container-jw { width: min(100% - 1.35rem, var(--max)); }
}

/* —— Nav —— */
.site-nav.blog-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--jw-deep);
  padding: 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  text-decoration: none;
  line-height: 1;
}
.brand-mark:hover { color: #fff; }

.nav-toggle {
  display: none;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 1.25rem;
  margin-inline: auto;
  background: #fff;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
  justify-content: flex-end;
}
.nav-links a {
  display: block;
  padding: 0.35rem 0.65rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  border-bottom-color: var(--accent);
}
.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
  border-bottom: 0 !important;
  border-radius: var(--radius);
  padding: 0.35rem 0.85rem !important;
}

.nav-meta {
  background: #152530;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.55);
}
.nav-meta-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  padding: 0.4rem 0;
  list-style: none;
  margin: 0;
}
.nav-meta a { color: rgba(255, 255, 255, 0.65); }
.nav-meta a:hover { color: #fff; }

@media (max-width: 991.98px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--jw-deep);
    padding: 0.5rem 1.25rem 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 0.7rem 0.25rem; font-size: 0.95rem; }
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: min(42vh, 360px);
  display: flex;
  align-items: flex-end;
  padding: 2.5rem 0 2.1rem;
  color: var(--white);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(15, 28, 36, 0.96) 0%, rgba(20, 55, 65, 0.88) 48%, rgba(12, 28, 36, 0.95) 100%),
    linear-gradient(160deg, rgba(42, 157, 159, 0.18) 0%, transparent 45%),
    repeating-linear-gradient(-28deg, transparent 0 22px, rgba(255,255,255,0.03) 22px 23px),
    #0f1c24;
  animation: hero-drift 20s var(--ease) infinite alternate;
}
@keyframes hero-drift {
  from { transform: scale(1.02); }
  to { transform: scale(1.06) translate(-0.8%, -0.4%); }
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 38em;
  animation: rise 0.85s var(--ease) both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}
.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5vw, 2.65rem);
  letter-spacing: 0.04em;
  line-height: 1.15;
  margin: 0 0 0.55rem;
  font-weight: 700;
}
.hero-tagline {
  margin: 0 0 0.5rem;
  font-size: clamp(1.05rem, 2.5vw, 1.3rem);
  font-weight: 600;
  letter-spacing: 0.03em;
}
.hero-lead {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.88);
  max-width: 32em;
}

/* —— Strip / layout —— */
.blog-strip {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.blog-strip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.2rem;
  list-style: none;
  margin: 0;
  padding: 0.65rem 0;
  font-size: 0.86rem;
}
.blog-strip-list a { color: var(--ink-soft); font-weight: 500; }
.blog-strip-list a:hover { color: var(--jw); }

.section {
  padding: 2.4rem 0;
}
.section-alt {
  background: var(--surface);
  border-block: 1px solid var(--line);
}
.section-head { margin-bottom: 1.25rem; max-width: 40em; }
.section-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--jw);
  font-weight: 700;
  margin-bottom: 0.35rem;
}
.section-title {
  margin: 0 0 0.4rem;
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.section-desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16.5rem;
  gap: 1.5rem 1.75rem;
  align-items: start;
}
@media (max-width: 991.98px) {
  .home-grid { grid-template-columns: 1fr; }
}

.rail {
  display: grid;
  gap: 1rem;
}
.rail-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  padding: 1rem 1.05rem;
}
.rail-block h3 {
  margin: 0 0 0.65rem;
  font-size: 0.95rem;
  font-weight: 700;
}
.rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
}
.rail-list li {
  padding-bottom: 0.45rem;
  border-bottom: 1px dashed var(--line);
}
.rail-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.rail-list strong { display: block; color: var(--ink); font-weight: 600; font-size: 0.9rem; }
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tag-cloud span {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
}

/* —— Media / blog —— */
.media-feature {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 0;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  background: var(--white);
  overflow: hidden;
}
.media-feature-visual { min-height: 14rem; background: var(--jw-deep); }
.media-feature-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 14rem;
}
.media-feature-body {
  padding: 1.35rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
@media (max-width: 767.98px) {
  .media-feature { grid-template-columns: 1fr; }
  .media-feature-visual,
  .media-feature-visual img { min-height: 11rem; }
}

.media-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}
.media-row {
  display: grid;
  grid-template-columns: 10.5rem minmax(0, 1fr);
  gap: 0.95rem;
  align-items: stretch;
  padding: 0.7rem;
  background: var(--white);
  border: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s var(--ease);
}
a.media-row:hover {
  border-color: var(--accent);
  color: inherit;
}
a.media-row:hover .media-title { color: var(--jw); }
.blog-static .media-row,
.blog-static .media-feature { cursor: default; }
.blog-static a.media-row { pointer-events: none; }

.media-thumb {
  overflow: hidden;
  background: var(--jw-deep);
  min-height: 5.5rem;
}
.media-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}
.media-body { display: flex; flex-direction: column; justify-content: center; min-width: 0; }
.media-cat {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--jw);
  margin-bottom: 0.25rem;
}
.media-title {
  margin: 0 0 0.3rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}
.media-feature .media-title { font-size: 1.25rem; }
.media-excerpt {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.media-date {
  font-size: 0.78rem;
  color: var(--mist);
}
@media (max-width: 575.98px) {
  .media-row { grid-template-columns: 6.5rem minmax(0, 1fr); gap: 0.7rem; padding: 0.55rem; }
  .media-title { font-size: 0.95rem; }
}

.list-switch {
  display: flex;
  gap: 0.85rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.list-switch .is-active { font-weight: 700; color: var(--jw); }
.list-switch a { color: var(--ink-soft); }

.media-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.media-card a {
  display: block;
  height: 100%;
  border: 1px solid var(--line);
  background: var(--white);
  color: inherit;
}
.media-card a:hover { border-color: var(--accent); color: inherit; }
.media-card-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.media-card-body { padding: 0.85rem 0.95rem; }
.media-card-body h3 { margin: 0.25rem 0; font-size: 1rem; }
.media-card-body p { margin: 0; font-size: 0.85rem; color: var(--ink-soft); }

/* —— Page / article —— */
.page-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 2rem 0 1.75rem;
}
.page-header .section-label { margin-bottom: 0.45rem; }
.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 1.95rem);
  margin: 0 0 0.5rem;
  line-height: 1.3;
  font-weight: 700;
}
.page-header p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 38em;
}

.article-shell { padding: 1.75rem 0 2.5rem; }
.article-body {
  max-width: 42rem;
}
.article-cover {
  margin-bottom: 1.1rem;
  border: 1px solid var(--line);
  overflow: hidden;
}
.article-cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 1.15rem;
  font-size: 0.85rem;
  color: var(--mist);
}
.article-meta-bar .tag {
  color: var(--jw);
  font-weight: 600;
}

/* Video placeholder */
.video-slot {
  margin: 0 0 1.35rem;
  border: 1px solid var(--line);
  background: #0c141a;
  aspect-ratio: 16 / 9;
  position: relative;
  overflow: hidden;
}
.video-slot-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  padding: 1rem;
}
.video-slot-play {
  width: 3.2rem;
  height: 3.2rem;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.55);
  display: grid;
  place-items: center;
  background: rgba(42, 157, 159, 0.25);
}
.video-slot-play::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0.55rem 0 0.55rem 0.95rem;
  border-color: transparent transparent transparent #fff;
  margin-left: 0.2rem;
}
.video-slot-label {
  margin: 0;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}
.video-slot-note {
  margin: 0;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.45);
}

.article-body h2 {
  margin: 1.6rem 0 0.65rem;
  font-size: 1.2rem;
  font-weight: 700;
}
.article-body p { margin: 0 0 0.9rem; color: var(--ink); }
.article-body ul,
.article-body ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  color: var(--ink-soft);
}
.article-body li { margin-bottom: 0.35rem; }
.article-body blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.about-prose {
  max-width: 40rem;
  color: var(--ink-soft);
}
.about-prose p + p { margin-top: 0.85rem; }
.about-prose strong { color: var(--ink); }

.info-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}
@media (max-width: 767.98px) {
  .info-grid { grid-template-columns: 1fr; }
}
.info-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 2px solid var(--jw);
  padding: 1rem 1.05rem;
}
.info-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
}
.info-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

/* —— Footer —— */
.site-footer {
  background: var(--jw-deep);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 0 1.5rem;
  margin-top: 0;
}
.footer-inner {
  display: grid;
  gap: 1rem;
}
.footer-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 0.2rem;
}
.footer-tag { margin: 0; font-size: 0.88rem; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.88rem;
}
.footer-links a { color: rgba(255, 255, 255, 0.7); }
.footer-links a:hover { color: #fff; }
.footer-copy {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.45);
}

/* —— WeChat contact —— */
.contact-band {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: 2rem 0;
}
.contact-band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem 2rem;
}
.contact-band-text h2 {
  margin: 0.25rem 0 0.35rem;
  font-size: 1.35rem;
  font-weight: 700;
}
.contact-band-text p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.contact-band-action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}
.wechat-id-line {
  margin: 0;
  font-size: 1rem;
  color: var(--ink);
}
.wechat-id {
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--jw);
}
.btn-wechat {
  border: 0;
  background: var(--jw);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s var(--ease);
}
.btn-wechat:hover { background: var(--accent); }
.btn-wechat-rail {
  margin-top: 0.75rem;
  width: 100%;
}
.wechat-inline {
  border: 0;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-weight: 700;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}
.wechat-inline:hover { color: #fff; }
.wechat-inline-dark { color: var(--jw); }
.wechat-inline-dark:hover { color: var(--accent); }
.footer-wechat {
  margin: 0.55rem 0 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.75);
}
.copy-toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(120%);
  background: var(--jw-deep);
  color: #fff;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius);
  font-size: 0.88rem;
  z-index: 100;
  opacity: 0;
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
  pointer-events: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.copy-toast.is-show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}


/* text-only lists (no decorative covers) */
.media-row-text {
  grid-template-columns: 1fr;
  padding: 0.95rem 1rem;
}
.media-feature-text {
  grid-template-columns: 1fr;
}
.media-feature-text .media-feature-body {
  padding: 1.5rem 1.35rem;
}
.media-feature-text .media-excerpt {
  -webkit-line-clamp: 4;
  max-width: 40em;
}
.media-card-text .media-card-body {
  padding: 1.1rem 1.15rem;
}
.media-card-text .media-date {
  display: block;
  margin-top: 0.55rem;
}

/* —— Related / latest at article bottom —— */
.article-aside-lists {
  padding: 0 0 2.5rem;
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.article-aside-lists .container-jw {
  padding-top: 2rem;
  display: grid;
  gap: 2rem;
}
.aside-block { max-width: 42rem; }
.aside-title {
  margin: 0 0 0.9rem;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}
.related-card {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: 0.85rem;
  align-items: center;
  padding: 0.55rem;
  background: var(--white);
  border: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s var(--ease);
}
.related-card:hover {
  border-color: var(--accent);
  color: inherit;
}
.related-card:hover h3 { color: var(--jw); }
.related-thumb {
  overflow: hidden;
  background: var(--jw-deep);
  min-height: 4.5rem;
}
.related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}
.related-body h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}
.related-body time {
  font-size: 0.78rem;
  color: var(--mist);
}
.latest-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  background: var(--white);
}
.latest-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0.95rem;
  border-bottom: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}
.latest-list li:last-child .latest-link { border-bottom: 0; }
.latest-link:hover .latest-title { color: var(--jw); }
.latest-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}
.latest-link time {
  flex-shrink: 0;
  font-size: 0.78rem;
  color: var(--mist);
}
@media (max-width: 575.98px) {
  .related-card { grid-template-columns: 5.5rem minmax(0, 1fr); gap: 0.65rem; }
  .latest-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}