/* 无忧OSSD — 自研学院风（深青绿 + 枫叶红点缀 + 墨色）
 * 不依赖 bootstrap / 易优 style.css；桌面 + 手机一体
 */
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&family=Noto+Serif+SC:wght@600;700&display=swap");

:root {
  --ink: #121c1e;
  --ink-soft: #2a3a3d;
  --teal: #0a5552;
  --teal-deep: #063e3c;
  --teal-mid: #12706c;
  --mint: #1a8a84;
  --maple: #b83a2e;
  --maple-soft: #d45648;
  --gold: #c4a05a;
  --fog: #eef3f2;
  --paper: #f6f9f8;
  --line: #d4e0de;
  --muted: #5c6f73;
  --white: #ffffff;
  --radius: 6px;
  --shadow: 0 12px 32px rgba(6, 62, 60, 0.1);
  --shadow-sm: 0 4px 14px rgba(6, 62, 60, 0.07);
  --font-d: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-b: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1120px;
  --gutter: 20px;
  --header-h: 72px;
  --header-z: 12000;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-b);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  /* clip 不创建 scrollport，避免破坏 fixed 层叠 */
  overflow-x: clip;
  padding-top: calc(var(--header-h) + env(safe-area-inset-top, 0px));
}

body.ossd-nav-open {
  overflow: hidden;
  touch-action: none;
}

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

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

a:hover {
  color: var(--teal-deep);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-d);
  color: var(--ink);
  line-height: 1.35;
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.02em;
}

p {
  margin: 0 0 1em;
  color: var(--muted);
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* 桌面内容区统一限宽居中；section/hero/banner 背景可全宽，标题/正文内层走本容器 */
.ossd-container {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* MidHub 注入正文兜底：即便未包 container 也不拉满 */
.ossd-section > .ossd-cms-html,
.ossd-cms-html {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}

.ossd-section > .ossd-cms-html {
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.ossd-container > .ossd-cms-html {
  max-width: none;
  margin: 0;
  padding: 0;
}

/* 桌面强制限宽，防止被 width:100% 栅格/组件/CMS 顶破 */
@media (min-width: 992px) {
  .ossd-container,
  .ossd-header__inner.ossd-container,
  .ossd-footer > .ossd-container,
  .ossd-cta > .ossd-container,
  .ossd-hero .ossd-container,
  .ossd-page-banner > .ossd-container,
  .ossd-page-banner .ossd-container,
  .ossd-section > .ossd-container,
  .ossd-section > .ossd-cms-html,
  .ossd-crumb > .ossd-container {
    width: 100% !important;
    max-width: var(--max) !important;
    margin-left: auto !important;
    margin-right: auto !important;
  }

  .ossd-intro,
  .ossd-svc,
  .ossd-svc__grid,
  .ossd-why-grid,
  .ossd-case-grid,
  .ossd-blog-grid,
  .ossd-row-2,
  .ossd-showcase__imgs,
  .ossd-img-row,
  .ossd-content-block {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  .ossd-container > .ossd-cms-html {
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }
}

.ossd-section {
  padding: 72px 0;
}

.ossd-section--fog {
  background: var(--fog);
}

.ossd-section--ink {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.85);
}

.ossd-eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--maple);
  margin-bottom: 10px;
  font-family: var(--font-b);
}

.ossd-heading {
  font-size: clamp(1.45rem, 2.4vw, 1.95rem);
  color: var(--teal-deep);
  margin-bottom: 12px;
}

.ossd-lead {
  font-size: 15px;
  max-width: 52ch;
  color: var(--muted);
}

.ossd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 22px;
  background: var(--teal);
  color: #fff !important;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.ossd-btn:hover {
  background: var(--teal-deep);
  transform: translateY(-1px);
}

.ossd-btn--sm {
  padding: 8px 14px;
  font-size: 13px;
}

.ossd-btn--maple {
  background: var(--maple);
}

.ossd-btn--maple:hover {
  background: #9a2f25;
}

.ossd-btn--ghost {
  background: transparent;
  color: var(--teal) !important;
  border: 1px solid var(--line);
}

.ossd-btn--ghost:hover {
  background: var(--fog);
  color: var(--teal-deep) !important;
}

/* —— Header ——
 * 手机端菜单必须压过 banner/hero：禁用 backdrop-filter / isolation
 *（二者会让 fixed 子元素换 stacking / containing block，菜单会被后面的
 * transform/opacity banner 盖住）。顶栏改 fixed + 高 z-index。
 */
.ossd-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--header-z);
  height: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  background: rgba(246, 249, 248, 0.98);
  border-bottom: 1px solid var(--line);
  overflow: visible;
}

.ossd-header.is-nav-open {
  z-index: var(--header-z);
}

.ossd-header__inner {
  position: relative;
  z-index: 2;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.ossd-logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 0;
  background: var(--teal-deep);
  border-radius: var(--radius);
  padding: 4px 8px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

.ossd-logo img {
  width: 148px;
  height: auto;
  display: block;
  opacity: 1 !important;
  filter: none !important;
  mix-blend-mode: normal !important;
}

.ossd-nav-toggle {
  display: none;
  position: relative;
  z-index: 3;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

.ossd-nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--teal-deep);
  border-radius: 1px;
  transition: transform 0.25s, opacity 0.2s;
}

.ossd-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.ossd-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.ossd-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.ossd-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ossd-nav a {
  display: inline-block;
  padding: 8px 12px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius);
  white-space: nowrap;
}

.ossd-nav a:hover,
.ossd-nav a.is-active {
  color: #fff;
  background: var(--teal);
}

.ossd-nav a.ossd-nav__tel {
  color: var(--maple);
  font-weight: 600;
}

.ossd-nav a.ossd-nav__tel:hover {
  background: rgba(184, 58, 46, 0.1);
  color: var(--maple);
}

/* —— Hero —— */
.ossd-hero {
  position: relative;
  z-index: 0;
  isolation: auto;
  min-height: clamp(400px, 48vw, 540px);
  overflow: hidden;
  background: var(--teal-deep);
  touch-action: pan-y;
  user-select: none;
}

.ossd-hero__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate3d(4%, 0, 0) scale(1.02);
  transition:
    opacity 0.9s cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 0.9s cubic-bezier(0.22, 0.61, 0.36, 1),
    visibility 0.9s;
  background-size: cover;
  background-position: center;
  will-change: opacity, transform;
}

.ossd-hero__slide.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate3d(0, 0, 0) scale(1);
  z-index: 1;
}

/* 厚遮罩盖住原图自带文案，只留自研排版 */
.ossd-hero__slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      115deg,
      rgba(6, 62, 60, 0.94) 0%,
      rgba(18, 28, 30, 0.86) 48%,
      rgba(184, 58, 46, 0.4) 100%
    );
}

.ossd-hero__content {
  position: relative;
  z-index: 1;
  height: 100%;
  min-height: clamp(400px, 48vw, 540px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 72px 0 88px;
  color: #fff;
  max-width: 680px;
}

.ossd-hero__content h2 {
  color: #fff;
  font-size: clamp(1.75rem, 3.4vw, 2.55rem);
  margin-bottom: 14px;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.3);
}

.ossd-hero__content p {
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  margin: 0;
  max-width: 52ch;
}

.ossd-hero__dots {
  position: absolute;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  gap: 8px;
}

.ossd-hero__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  padding: 0;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: background 0.25s ease, transform 0.25s ease;
}

.ossd-hero__dot.is-active,
.ossd-hero__dot:hover {
  background: var(--gold);
  transform: scale(1.15);
}

.ossd-hero__arrow {
  position: absolute;
  top: 50%;
  z-index: 3;
  transform: translateY(-50%);
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  background: rgba(6, 62, 60, 0.45);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  transition: background 0.2s ease, border-color 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.ossd-hero__arrow:hover {
  background: rgba(6, 62, 60, 0.75);
  border-color: var(--gold);
}

.ossd-hero__arrow::before {
  content: "";
  width: 9px;
  height: 9px;
  border-top: 2px solid #fff;
  border-right: 2px solid #fff;
}

.ossd-hero__prev {
  left: 14px;
}

.ossd-hero__prev::before {
  transform: rotate(-135deg);
  margin-left: 3px;
}

.ossd-hero__next {
  right: 14px;
}

.ossd-hero__next::before {
  transform: rotate(45deg);
  margin-right: 3px;
}

/* —— Page banner (inner) ——
 * 内页横幅：必须有背景图 + 标题。空 div 只会露出一条矮色带，看起来像「空白」。
 */
.ossd-page-banner {
  position: relative;
  z-index: 0;
  min-height: 220px;
  display: flex;
  align-items: flex-end;
  padding: 56px 0 40px;
  color: #fff;
  background-color: var(--teal-deep);
  background-image: linear-gradient(
      120deg,
      rgba(6, 48, 46, 0.82) 0%,
      rgba(10, 85, 82, 0.55) 55%,
      rgba(10, 85, 82, 0.35) 100%
    ),
    var(
      --page-banner-img,
      url("https://oss.51liuxue.com/midhub/sites/51ossd/image/8e6f6f743c19418fb7bc62efef7264d6.png")
    );
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* 背景全宽；标题/副文必须走内层 container，禁止直接铺满 */
.ossd-page-banner > .ossd-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.ossd-page-banner__title {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 100%;
  font-family: var(--font-d);
  font-size: clamp(1.55rem, 2.8vw, 2.15rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.35);
}

.ossd-page-banner__sub {
  position: relative;
  z-index: 1;
  margin: 8px 0 0;
  max-width: 36em;
  font-size: 0.95rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.88);
}

.ossd-crumb {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  background: var(--white);
  font-size: 13px;
  color: var(--muted);
}

.ossd-crumb a {
  color: var(--teal);
}

.ossd-crumb span {
  margin: 0 6px;
  opacity: 0.5;
}

/* —— Intro / tabs —— */
.ossd-intro {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}

.ossd-intro__img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.ossd-intro__img img {
  width: 100%;
  object-fit: cover;
  min-height: 280px;
}

.ossd-tabs {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 6px;
}

.ossd-tabs input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 0;
  height: 0;
}

.ossd-tabs > label {
  flex: 1 1 140px;
  text-align: center;
  padding: 10px 12px;
  background: var(--fog);
  border: 1px solid var(--line);
  border-radius: var(--radius) var(--radius) 0 0;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.ossd-tabs input:checked + label {
  background: var(--teal);
  color: #fff;
  border-color: var(--teal);
}

.ossd-tabs__panels {
  flex: 1 1 100%;
  width: 100%;
}

.ossd-tabs__panel {
  display: none;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  padding: 22px 22px 24px;
  box-shadow: var(--shadow-sm);
  min-height: 200px;
}

.ossd-tabs input#tab1:checked ~ .ossd-tabs__panels #content1,
.ossd-tabs input#tab2:checked ~ .ossd-tabs__panels #content2,
.ossd-tabs input#tab3:checked ~ .ossd-tabs__panels #content3 {
  display: block;
}

.ossd-tabs__panel h5 {
  font-size: 1.05rem;
  color: var(--teal-deep);
  margin-bottom: 10px;
}

.ossd-tabs__panel p:last-child {
  margin-bottom: 0;
}

.ossd-img-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.ossd-img-row img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.ossd-content-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.ossd-content-block + .ossd-content-block {
  margin-top: 24px;
}

.ossd-content-block img {
  margin-top: 12px;
  border-radius: var(--radius);
}

/* —— Services —— */
.ossd-svc {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 36px;
  align-items: start;
}

.ossd-svc__aside .ossd-heading {
  margin-bottom: 14px;
}

.ossd-svc__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.ossd-svc-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.ossd-svc-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.ossd-svc-card__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
  font-family: var(--font-b);
}

.ossd-svc-card h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--ink);
}

.ossd-svc-card p {
  font-size: 13.5px;
  line-height: 1.7;
  margin: 0;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 5;
  overflow: hidden;
}

/* —— Why —— */
.ossd-why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.ossd-why-card {
  text-align: center;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 22px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease;
}

.ossd-why-card:hover {
  transform: translateY(-4px);
}

.ossd-why-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  border: 2px solid var(--line);
  background: var(--fog);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal);
  font-family: var(--font-d);
  font-size: 1.15rem;
  font-weight: 700;
}

.ossd-why-card h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  color: var(--ink);
}

.ossd-why-card p {
  font-size: 13.5px;
  margin: 0;
  line-height: 1.7;
}

/* —— Showcase —— */
.ossd-showcase__imgs {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 28px;
}

.ossd-showcase__imgs img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--line);
}

/* —— CTA strip —— */
.ossd-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, var(--teal-deep), var(--teal) 55%, #145a56);
  padding: 56px 0;
  text-align: center;
}

.ossd-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(184, 58, 46, 0.25), transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(196, 160, 90, 0.15), transparent 35%);
  pointer-events: none;
}

.ossd-cta .ossd-container {
  position: relative;
  z-index: 1;
}

.ossd-cta h3 {
  color: #fff;
  font-size: clamp(1.4rem, 2.5vw, 1.85rem);
  margin-bottom: 8px;
}

.ossd-cta p {
  color: rgba(255, 255, 255, 0.88);
  margin: 0;
}

/* —— Cases：横排小 logo + 文案 —— */
.ossd-case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.ossd-case-card {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-height: 0;
  text-decoration: none !important;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.ossd-case-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.ossd-case-card__logo,
.ossd-case-detail__logo {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f3f7f6;
  border-radius: 8px;
  overflow: hidden;
}

.ossd-case-card__logo img,
.ossd-case-detail__logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 6px;
  mix-blend-mode: multiply;
}

.ossd-case-card__body {
  flex: 1;
  min-width: 0;
  padding: 0;
  background: transparent;
  color: inherit;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.ossd-case-card__tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--maple);
  margin-bottom: 4px;
  font-family: var(--font-b);
  font-weight: 600;
}

.ossd-case-card__body h4 {
  color: var(--ink);
  font-size: 15px;
  margin: 0 0 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ossd-case-card__body p {
  color: var(--muted);
  font-size: 12px;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ossd-blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.ossd-case-card--blog .ossd-blog-card__date {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.ossd-blog-card {
  display: none;
}

/* —— Case detail —— */
.ossd-case-detail__hero {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-bottom: 18px;
}

.ossd-case-detail__logo {
  width: 72px;
  height: 72px;
}

.ossd-case-detail__hero-text h1 {
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  margin: 0 0 6px;
  color: var(--teal-deep);
}

.ossd-case-detail__name {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.ossd-case-detail__panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px 22px;
  margin-bottom: 16px;
}

.ossd-case-detail__panel h2 {
  font-size: 1.05rem;
  margin: 0 0 14px;
  color: var(--teal-deep);
}

.ossd-case-detail__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
}

.ossd-case-detail__kv {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.ossd-case-detail__kv .k {
  font-size: 12px;
  color: var(--muted);
}

.ossd-case-detail__kv .v {
  font-size: 14px;
  color: var(--ink);
  word-break: break-word;
}

.ossd-case-detail__rich {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.8;
  word-break: break-word;
}

.ossd-case-detail__offers {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.ossd-case-detail__offers a {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #f8faf9;
}

.ossd-case-detail__offers img {
  width: 100%;
  height: auto;
  display: block;
}

.ossd-case-detail__back {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 0;
}

.ossd-loading,
.ossd-empty {
  text-align: center;
  padding: 32px 12px;
  color: var(--muted);
  grid-column: 1 / -1;
}

/* —— Contact form —— */
.ossd-lxpg {
  max-width: 720px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 32px 36px;
}

.ossd-lxpg h3 {
  color: var(--teal-deep);
  font-size: 1.5rem;
  margin-bottom: 6px;
}

.ossd-lxpg .lead {
  margin-bottom: 22px;
}

.ossd-lxpg .section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--teal);
  margin: 20px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  letter-spacing: 0.06em;
  font-family: var(--font-b);
}

.ossd-field {
  margin-bottom: 14px;
}

.ossd-field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.ossd-field label .req {
  color: var(--maple);
  margin-right: 3px;
}

.ossd-field input,
.ossd-field select,
.ossd-field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 11px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: var(--fog);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.ossd-field input:focus,
.ossd-field select:focus,
.ossd-field textarea:focus {
  outline: none;
  border-color: var(--mint);
  box-shadow: 0 0 0 3px rgba(26, 138, 132, 0.18);
  background: #fff;
}

.ossd-field.is-error input,
.ossd-field.is-error select,
.ossd-field.is-error textarea {
  border-color: var(--maple);
  animation: ossd-flash 0.45s ease 2;
}

@keyframes ossd-flash {
  0%, 100% { box-shadow: 0 0 0 0 transparent; }
  50% { box-shadow: 0 0 0 3px rgba(184, 58, 46, 0.25); }
}

.ossd-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.ossd-submit {
  width: 100%;
  margin-top: 18px;
  padding: 13px 18px;
  background: var(--teal);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.04em;
  font-family: inherit;
  transition: background 0.2s;
}

.ossd-submit:hover:not(:disabled) {
  background: var(--teal-deep);
}

.ossd-submit:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.ossd-hint {
  text-align: center;
  font-size: 12px;
  margin-top: 10px;
}

.ossd-channel-note {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  margin-top: 6px;
}

.ossd-done {
  text-align: center;
  padding: 36px 12px;
}

.ossd-done h4 {
  color: var(--teal-deep);
  margin-bottom: 10px;
}

.ossd-done .err {
  color: var(--maple);
}

/* —— Footer —— */
.ossd-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.72);
  padding: 40px 0 32px;
  text-align: center;
}

.ossd-footer img {
  width: 140px;
  margin: 0 auto 16px;
  opacity: 1 !important;
  filter: none !important;
  mix-blend-mode: normal !important;
  background: var(--teal-deep);
  border-radius: var(--radius);
  padding: 6px 10px;
}

.ossd-footer a {
  color: rgba(255, 255, 255, 0.72);
}

.ossd-footer a:hover {
  color: var(--gold);
}

.ossd-footer__top {
  display: inline-block;
  margin: 10px 0 14px;
  font-size: 13px;
}

.ossd-footer p {
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
  margin: 0;
}

/* —— Motion —— */
@media (prefers-reduced-motion: no-preference) {
  .ossd-hero__slide.is-active .ossd-hero__content {
    animation: ossd-rise 0.7s ease both;
  }
  .ossd-svc-card,
  .ossd-why-card,
  .ossd-case-card {
    animation: ossd-fade-in 0.5s ease both;
  }
}

@keyframes ossd-rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes ossd-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* —— Responsive —— */
@media (max-width: 991px) {
  :root {
    --header-h: 64px;
  }

  .ossd-nav-toggle {
    display: flex;
  }

  /* 菜单用 fixed 独立层，避开 header 裁切第一项；顶栏保持原高度 */
  .ossd-header.is-nav-open {
    height: calc(var(--header-h) + env(safe-area-inset-top, 0px));
    bottom: auto;
    min-height: 0;
    background: rgba(246, 249, 248, 0.99);
  }

  .ossd-nav {
    position: fixed;
    top: calc(var(--header-h) + env(safe-area-inset-top, 0px) + 1px);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin: 0;
    padding: 20px 16px calc(28px + env(safe-area-inset-bottom, 0px));
    background: #f6f9f8;
    transform: translate3d(100%, 0, 0);
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.32s ease, visibility 0.32s;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: calc(var(--header-z) + 10);
    box-sizing: border-box;
  }

  .ossd-nav.is-open {
    transform: translate3d(0, 0, 0);
    visibility: visible;
    pointer-events: auto;
  }

  .ossd-nav a {
    display: block;
    padding: 16px 16px;
    font-size: 16px;
    line-height: 1.4;
    border: 1px solid var(--line);
    background: var(--white);
    position: relative;
    z-index: 1;
    pointer-events: auto;
    box-sizing: border-box;
  }

  .ossd-nav a:first-child {
    margin-top: 0;
  }

  .ossd-hero,
  .ossd-page-banner {
    z-index: 0;
  }

  .ossd-hero__arrow {
    width: 38px;
    height: 38px;
  }

  .ossd-intro,
  .ossd-svc {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .ossd-svc__grid {
    grid-template-columns: 1fr;
  }

  .ossd-why-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .ossd-case-grid {
    grid-template-columns: 1fr;
  }

  .ossd-blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .ossd-hero {
    min-height: 380px;
  }

  .ossd-hero__content {
    min-height: 380px;
    padding: 48px 0 72px;
  }

  .ossd-section {
    padding: 52px 0;
  }

  .ossd-tabs > label {
    flex: 1 1 100%;
    border-radius: var(--radius);
  }

  .ossd-tabs__panel {
    border-radius: var(--radius);
  }

  .ossd-img-row img {
    width: 100% !important;
  }
}

@media (max-width: 575px) {
  :root {
    --gutter: 14px;
  }

  .ossd-container {
    width: 100%;
    max-width: var(--max);
    padding-left: var(--gutter);
    padding-right: var(--gutter);
  }

  .ossd-logo img {
    width: 120px;
  }

  .ossd-blog-grid {
    grid-template-columns: 1fr;
  }

  .ossd-row-2 {
    grid-template-columns: 1fr;
  }

  .ossd-lxpg {
    padding: 22px 16px 26px;
  }

  .ossd-case-detail__grid {
    grid-template-columns: 1fr;
  }

  .ossd-case-detail__hero {
    padding: 16px;
  }

  .ossd-hero {
    min-height: 340px;
  }

  .ossd-hero__content {
    min-height: 340px;
  }

  .ossd-hero__content h2 {
    font-size: 1.45rem;
  }

  .ossd-page-banner {
    min-height: 160px;
    padding: 40px 0 28px;
  }

  .ossd-page-banner__title {
    font-size: 1.4rem;
  }
}