/* ============================================================
   英迈云在线资料站 · 站点皮肤
   https://git.inmind-lab.com/assets/site.css
   风格参考 ke.inmind-lab.com（深海军蓝渐变 + 玻璃质感 + 橙色 CTA）
   说明：仅覆盖导航栏 / 页脚 / 首页，不改动仓库页的既有交互样式
   ============================================================ */

:root {
  --ir-blue: #0a2a5e;
  --ir-blue-2: #123f86;
  --ir-blue-3: #1e63c8;
  --ir-cyan: #17c2d8;
  --ir-orange: #ff7a2f;
  --ir-orange-2: #ff9f45;
  --ir-ink: #17203a;
  --ir-gray: #6b7688;
  --ir-line: #e6ecf6;
  --ir-bg: #f4f8fd;
  --ir-radius: 16px;
  --ir-shadow: 0 10px 30px rgba(12, 40, 90, .08);
  --ir-shadow-hover: 0 18px 42px rgba(12, 40, 90, .16);
}

/* ============================================================
   1. 顶部导航栏
   ============================================================ */
#navbar {
  position: relative;
  background:
    radial-gradient(120% 200% at 10% 0%, rgba(23, 194, 216, .16) 0%, rgba(23, 194, 216, 0) 45%),
    linear-gradient(100deg, #071534 0%, #0d2755 46%, #153f86 100%);
  border-bottom: 1px solid rgba(255, 255, 255, .10);
  box-shadow: 0 8px 26px rgba(4, 16, 42, .35);
}
#navbar::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, var(--ir-cyan) 0%, #4f8cff 48%, var(--ir-orange) 100%);
  pointer-events: none;
}
#navbar #navbar-logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding-right: 14px;
}
#navbar #navbar-logo img {
  flex: none;
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, .28));
}
#navbar .ir-brand-text {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .4px;
  color: #fff;
  white-space: nowrap;
  text-shadow: 0 1px 6px rgba(0, 0, 0, .25);
}

@media (min-width: 768px) {
  #navbar .item {
    color: rgba(255, 255, 255, .84) !important;
    border-radius: 999px;
    transition: background .22s ease, color .22s ease;
  }
  #navbar .item:hover,
  #navbar .item:focus {
    color: #fff !important;
    background: rgba(255, 255, 255, .12) !important;
  }
  #navbar .item.active {
    color: #fff !important;
    background: linear-gradient(135deg, rgba(23, 194, 216, .34), rgba(79, 140, 255, .34)) !important;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .18);
  }
  #navbar #navbar-logo { border-radius: 12px; }
  #navbar .ui.dropdown .menu,
  #navbar .ui.dropdown .menu .item { color: var(--ir-ink) !important; }
  #navbar .ui.dropdown .menu .item:hover { background: #f2f6ff !important; color: var(--ir-blue-2) !important; }
}

@media (max-width: 767px) {
  #navbar,
  #navbar.navbar-menu-open {
    background: linear-gradient(100deg, #071534 0%, #0d2755 60%, #12386f 100%);
  }
  #navbar .navbar-left > .item,
  #navbar .navbar-right > .item,
  #navbar #navbar-expand-toggle { color: #fff !important; }
  #navbar .ir-brand-text { font-size: 14px; }
}
@media (max-width: 420px) {
  #navbar .ir-brand-text { display: none; }
}

/* ============================================================
   2. 首页
   ============================================================ */
.ir-home,
.ir-home * { box-sizing: border-box; }
.ir-home {
  color: var(--ir-ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: #fff;
  overflow-x: hidden;
}
.ir-home a { text-decoration: none; }
.ir-home img, .ir-home svg { max-width: 100%; }
.ir-wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 22px; }

/* ---------- 按钮 ---------- */
.ir-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 52px; padding: 0 30px; border-radius: 999px;
  font-size: 17px; font-weight: 600; letter-spacing: .3px;
  transition: all .22s ease; white-space: nowrap; cursor: pointer; border: 0;
}
.ir-btn svg { width: 18px; height: 18px; }
.ir-btn--main {
  color: #fff;
  background: linear-gradient(120deg, var(--ir-orange), var(--ir-orange-2));
  box-shadow: 0 12px 26px rgba(255, 122, 47, .34);
}
.ir-btn--main:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 16px 32px rgba(255, 122, 47, .45); }
.ir-btn--ghost {
  color: #fff; border: 1.5px solid rgba(255, 255, 255, .55);
  background: rgba(255, 255, 255, .08);
}
.ir-btn--ghost:hover { color: #fff; background: rgba(255, 255, 255, .2); transform: translateY(-2px); }
.ir-btn--line {
  height: 44px; padding: 0 22px; font-size: 15px;
  color: var(--ir-blue-3); border: 1.5px solid #c9dcf6; background: #fff;
}
.ir-btn--line:hover { background: #f2f7ff; color: var(--ir-blue-3); }

/* ---------- Hero ---------- */
.ir-hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(1000px 520px at 88% 8%, rgba(23, 194, 216, .34), transparent 62%),
    radial-gradient(760px 460px at 6% 92%, rgba(255, 122, 47, .20), transparent 60%),
    linear-gradient(145deg, #061a3d 0%, #0a2a5e 42%, #11408c 100%);
  padding: 72px 0 84px;
}
.ir-hero::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(80% 70% at 50% 30%, #000 20%, transparent 78%);
  pointer-events: none;
}
.ir-hero__inner { position: relative; z-index: 1; max-width: 820px; }
.ir-hero__tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px;
  font-size: 13px; letter-spacing: 1px;
  color: #d8ecff; background: rgba(255, 255, 255, .10);
  border: 1px solid rgba(255, 255, 255, .16);
}
.ir-hero__tag i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ir-cyan); box-shadow: 0 0 0 4px rgba(23, 194, 216, .22);
}
.ir-hero h1 {
  margin: 22px 0 18px;
  font-size: 46px; line-height: 1.22; font-weight: 800; letter-spacing: .5px;
  color: #fff;
}
.ir-hero h1 em {
  display: block; font-style: normal;
  background: linear-gradient(100deg, #6fe6f4, #9fc4ff 55%, #ffc08a);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.ir-hero__sub {
  margin: 0 0 30px; max-width: 640px;
  font-size: 16.5px; line-height: 1.9; color: rgba(255, 255, 255, .78);
}
.ir-hero__sub b { color: #fff; font-weight: 600; }
.ir-hero__btns { display: flex; flex-wrap: wrap; gap: 14px; }
.ir-hero__stats {
  display: flex; flex-wrap: wrap; gap: 14px 40px;
  margin: 42px 0 0; padding: 24px 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, .14);
}
.ir-hero__stats li { display: flex; flex-direction: column; gap: 4px; }
.ir-hero__stats strong { font-size: 24px; font-weight: 800; color: #fff; letter-spacing: .5px; }
.ir-hero__stats span { font-size: 13.5px; color: rgba(255, 255, 255, .62); }

/* ---------- 区块与标题 ---------- */
.ir-sec { padding: 76px 0; }
.ir-sec--bg { background: var(--ir-bg); }
.ir-head { text-align: center; max-width: 760px; margin: 0 auto 46px; }
.ir-head__en {
  display: inline-block; margin-bottom: 12px;
  font-size: 12.5px; font-weight: 700; letter-spacing: 3px;
  color: var(--ir-blue-3); text-transform: uppercase; opacity: .75;
}
.ir-head h2 {
  margin: 0 0 14px; font-size: 32px; line-height: 1.3; font-weight: 800;
  color: var(--ir-blue); letter-spacing: .5px;
}
.ir-head h2 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--ir-blue-3), var(--ir-cyan));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.ir-head p { margin: 0; font-size: 15.5px; line-height: 1.85; color: var(--ir-gray); }

/* ---------- 课程方向卡片 ---------- */
.ir-cards {
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.ir-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 28px 26px 22px;
  background: #fff; border: 1px solid var(--ir-line); border-radius: var(--ir-radius);
  box-shadow: var(--ir-shadow);
  transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease;
}
.ir-card::before {
  content: ""; position: absolute; left: 26px; right: 26px; top: 0; height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, var(--ir-cyan), var(--ir-blue-3));
  opacity: 0; transition: opacity .24s ease;
}
.ir-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--ir-shadow-hover);
  border-color: #d3e3f8;
}
.ir-card:hover::before { opacity: 1; }
.ir-card__ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; margin-bottom: 16px;
  border-radius: 13px; color: #fff;
  background: linear-gradient(135deg, var(--ir-blue-3), var(--ir-cyan));
  box-shadow: 0 10px 22px rgba(30, 99, 200, .24);
}
.ir-card__ico svg { width: 24px; height: 24px; }
.ir-card:nth-child(4n+1) .ir-card__ico { background: linear-gradient(135deg, #1e63c8, #17c2d8); }
.ir-card:nth-child(4n+2) .ir-card__ico { background: linear-gradient(135deg, #0f3d7a, #2f7fd8); }
.ir-card:nth-child(4n+3) .ir-card__ico { background: linear-gradient(135deg, #123f86, #17c2d8); }
.ir-card:nth-child(4n) .ir-card__ico { background: linear-gradient(135deg, #ff7a2f, #ffb066); box-shadow: 0 10px 22px rgba(255, 122, 47, .28); }
.ir-card h3 {
  margin: 0 0 10px; font-size: 19px; font-weight: 700; color: var(--ir-blue);
  letter-spacing: .3px;
}
.ir-card p {
  margin: 0 0 18px; font-size: 14.5px; line-height: 1.8; color: var(--ir-gray);
  flex: 1 1 auto;
}
.ir-card__links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.ir-card__links a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 13px; border-radius: 999px;
  font-size: 13px; color: var(--ir-blue-2);
  background: #f2f7ff; border: 1px solid #dfeafb;
  transition: all .2s ease;
}
.ir-card__links a:hover { background: var(--ir-blue-3); border-color: var(--ir-blue-3); color: #fff; }
.ir-card__links a.is-primary {
  background: linear-gradient(135deg, #eaf3ff, #e6fbfe);
  border-color: #cfe5fb; font-weight: 600;
}

/* ---------- 使用指引 ---------- */
.ir-steps {
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.ir-step {
  padding: 26px 24px;
  background: #fff; border: 1px solid var(--ir-line);
  border-radius: var(--ir-radius);
}
.ir-step__num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; margin-bottom: 14px;
  border-radius: 50%; font-size: 15px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--ir-blue-3), var(--ir-cyan));
}
.ir-step h3 { margin: 0 0 8px; font-size: 16.5px; font-weight: 700; color: var(--ir-blue); }
.ir-step p { margin: 0; font-size: 14px; line-height: 1.85; color: var(--ir-gray); }
.ir-step code {
  padding: 2px 6px; border-radius: 5px; font-size: 12.5px;
  background: #eef3fb; color: var(--ir-blue-2);
}

/* ---------- 底部 CTA ---------- */
.ir-cta {
  padding: 0 0 78px;
  background: #fff;
}
.ir-cta__box {
  position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: space-between;
  gap: 26px; flex-wrap: wrap;
  padding: 42px 44px; border-radius: 22px; color: #fff;
  background:
    radial-gradient(620px 260px at 92% 12%, rgba(23, 194, 216, .40), transparent 62%),
    linear-gradient(120deg, #071c40 0%, #0f3572 55%, #14488f 100%);
  box-shadow: 0 22px 48px rgba(7, 27, 64, .28);
}
.ir-cta__box h2 { margin: 0 0 10px; font-size: 25px; font-weight: 800; color: #fff; letter-spacing: .4px; }
.ir-cta__box p { margin: 0; font-size: 14.5px; line-height: 1.85; color: rgba(255, 255, 255, .74); max-width: 560px; }
.ir-cta__btns { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- 首页响应式 ---------- */
@media (max-width: 900px) {
  .ir-hero { padding: 56px 0 64px; }
  .ir-hero h1 { font-size: 36px; }
  .ir-hero__sub { font-size: 15.5px; }
  .ir-sec { padding: 58px 0; }
  .ir-head h2 { font-size: 26px; }
  .ir-cta__box { padding: 32px 28px; }
}
@media (max-width: 560px) {
  .ir-hero h1 { font-size: 29px; }
  .ir-hero__stats { gap: 14px 26px; }
  .ir-hero__stats strong { font-size: 20px; }
  .ir-btn { height: 46px; padding: 0 22px; font-size: 15px; }
  .ir-card { padding: 24px 20px 18px; }
  .ir-cta__box h2 { font-size: 21px; }
}

/* ============================================================
   3. 页脚（全站生效）
   ============================================================ */
.page-footer.ir-footer {
  display: block !important;
  padding: 0 !important;
  margin: 0 !important;
  border-top: 0 !important;
  font-size: 14px !important;
  line-height: 1.7;
  color: rgba(255, 255, 255, .82);
  background:
    radial-gradient(120% 220% at 88% -20%, rgba(23, 194, 216, .14) 0%, rgba(23, 194, 216, 0) 46%),
    linear-gradient(100deg, #050f28 0%, #0a1f45 52%, #0e2b5e 100%) !important;
}
.ir-footer {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
.ir-footer::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, var(--ir-cyan) 0%, #4f8cff 48%, var(--ir-orange) 100%);
  opacity: .9;
}
.ir-footer a { text-decoration: none; }
.ir-f-wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 22px; }
.ir-f-main { padding: 50px 0 38px; }
.ir-f-main > .ir-f-wrap {
  display: grid; gap: 36px 44px;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
}
.ir-f-logo { display: inline-flex; align-items: center; gap: 10px; }
.ir-f-logo img { width: 30px; height: 30px; flex: none; }
.ir-f-logo span { font-size: 18px; font-weight: 800; letter-spacing: .5px; color: #fff; white-space: nowrap; }
.ir-f-desc {
  margin: 16px 0 0; max-width: 330px;
  font-size: 13.5px; line-height: 1.95; color: rgba(255, 255, 255, .6);
}
.ir-f-login {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 20px; height: 40px; padding: 0 20px; border-radius: 999px;
  font-size: 14px; font-weight: 600; color: #fff;
  background: linear-gradient(135deg, var(--ir-orange), var(--ir-orange-2));
  box-shadow: 0 10px 22px rgba(255, 122, 47, .32);
  transition: all .22s ease;
}
.ir-f-login:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 14px 28px rgba(255, 122, 47, .42); }
.ir-f-login svg { width: 16px; height: 16px; }
.ir-f-col h4 {
  position: relative; margin: 0 0 16px; padding-bottom: 11px;
  font-size: 15px; font-weight: 700; letter-spacing: .5px; color: #fff;
}
.ir-f-col h4::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 26px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--ir-cyan), var(--ir-blue-3));
}
.ir-f-col a {
  display: block; margin: 0 0 11px;
  font-size: 13.5px; color: rgba(255, 255, 255, .68);
  transition: color .2s ease, transform .2s ease;
}
.ir-f-col a:hover { color: #fff; transform: translateX(3px); }
.ir-f-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  background: rgba(0, 0, 0, .18);
}
.ir-f-bottom > .ir-f-wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px 26px; flex-wrap: wrap;
  padding: 16px 22px;
}
.ir-f-legal {
  display: flex; align-items: center; gap: 8px 18px; flex-wrap: wrap;
  font-size: 12.5px; color: rgba(255, 255, 255, .55);
}
.ir-f-legal a { color: rgba(255, 255, 255, .65); }
.ir-f-legal a:hover { color: #fff; }
.ir-f-legal span.ir-dot { opacity: .35; }
.ir-f-tools { display: flex; align-items: center; gap: 16px; }
.ir-footer #footer-theme-selector {
  color: rgba(255, 255, 255, .62);
  font-size: 12.5px;
}
.ir-footer #footer-theme-selector .default-text { display: inline-flex; align-items: center; gap: 6px; }
.ir-footer #footer-theme-selector .menu { color: var(--ir-ink); }
.ir-f-tools a { font-size: 12.5px; color: rgba(255, 255, 255, .55); }
.ir-f-tools a:hover { color: #fff; }

@media (max-width: 980px) {
  .ir-f-main > .ir-f-wrap { grid-template-columns: 1fr 1fr; gap: 32px 30px; }
  .ir-f-brand { grid-column: 1 / -1; }
  .ir-f-desc { max-width: none; }
}
@media (max-width: 560px) {
  .ir-f-main { padding: 38px 0 28px; }
  .ir-f-main > .ir-f-wrap { gap: 26px 22px; }
  .ir-f-bottom > .ir-f-wrap { flex-direction: column; align-items: flex-start; }
}