/* 康剑医学科技官网 · 零依赖手写样式
   设计语言：医用白 + 墨青 + 玉青点缀；克制、专业、可信。 */

:root {
  --ink: #0f2430;          /* 墨青：标题/页脚 */
  --ink-soft: #29424f;
  --body: #3d5361;
  --jade: #0e7f6b;         /* 玉青：品牌主色 */
  --jade-deep: #0a5f50;
  --jade-ghost: #e7f3f0;
  --paper: #fbfcfc;
  --paper-alt: #f2f6f6;
  --line: #dde6e6;
  --radius: 14px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, "Segoe UI", "Noto Sans CJK SC", sans-serif;
  color: var(--body);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
h1, h2, h3 { color: var(--ink); line-height: 1.3; margin: 0 0 .5em; font-weight: 650; }
h1 { font-size: clamp(2.1rem, 5.2vw, 3.4rem); letter-spacing: .01em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; }
a { color: var(--jade-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
.en, .en-inline { color: #7b909b; font-size: .86em; }
.en { display: block; margin-top: -.4em; }
.eyebrow {
  color: var(--jade); font-size: .8rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase; margin-bottom: .9em;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(251, 252, 252, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-name { font-weight: 700; font-size: 1.35rem; letter-spacing: .02em; }
.brand-en { display: block; font-weight: 500; font-size: .72rem; color: #8aa0aa; letter-spacing: .12em; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: .92rem; }
.nav-links a { color: var(--ink-soft); }
.lang-switch {
  border: 1px solid var(--line); color: var(--ink-soft) !important;
  padding: 5px 12px; border-radius: 999px; font-size: .85rem; transition: background .15s;
}
.lang-switch:hover { background: var(--paper-alt); text-decoration: none; }
.btn-login {
  border: 1px solid var(--jade); color: var(--jade-deep) !important;
  padding: 6px 14px; border-radius: 999px; transition: background .15s;
}
.btn-login:hover { background: var(--jade-ghost); text-decoration: none; }
/* 主页右上角登录态（kj_who cookie + Caddy templates，D-019） */
.nav-user { color: var(--ink); font-weight: 600; }
form.nav-logout { margin: 0; }
button.btn-login { background: none; font: inherit; cursor: pointer; }
@media (max-width: 760px) {
  .nav-links a:not(.btn-login):not(.lang-switch) { display: none; }
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 120px;
  background:
    radial-gradient(1100px 500px at 85% -10%, #e3efec 0%, transparent 60%),
    radial-gradient(900px 420px at -10% 110%, #e9f2f1 0%, transparent 55%),
    var(--paper);
  overflow: hidden;
}
.br-m { display: none; }
@media (max-width: 560px) { .br-m { display: inline; } }
.hero-en { color: #6f8792; font-size: 1.05rem; margin-top: -0.6em; letter-spacing: .04em; }
.hero-lead { max-width: 46em; font-size: 1.06rem; }
.hero-lead strong { color: var(--ink); }
.hero-lead-en { font-size: .9rem; color: #7b909b; max-width: 52em; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.btn-primary {
  background: var(--jade); color: #fff !important; font-weight: 600;
  padding: 11px 22px; border-radius: 999px; border: none;
  transition: background .15s; display: inline-block;
}
.btn-primary:hover { background: var(--jade-deep); text-decoration: none; }
.btn-ghost {
  padding: 11px 20px; border-radius: 999px; color: var(--ink-soft) !important;
  border: 1px solid var(--line); background: #fff;
}
.btn-ghost:hover { border-color: var(--jade); text-decoration: none; }
.ecg {
  position: absolute; left: 0; right: 0; bottom: 18px;
  width: 100%; height: 54px; color: var(--jade); opacity: .3;
}

/* ---------- sections ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--paper-alt); }
.section-lead { max-width: 52em; margin-bottom: 2em; }
.cols { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; }
@media (max-width: 820px) { .cols { grid-template-columns: 1fr; } }

.fact-list { display: flex; flex-direction: column; gap: 14px; }
.fact {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 18px;
}
.fact-k { display: block; font-weight: 650; color: var(--jade-deep); font-size: .86rem; margin-bottom: 2px; }
.fact-v { font-size: .92rem; }

/* ---------- cards ---------- */
.card-grid { display: grid; gap: 22px; }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .card-grid.three { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .card-grid.two { grid-template-columns: 1fr; } }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 26px 20px;
  transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: 0 10px 30px rgba(15, 36, 48, .07); transform: translateY(-2px); }
.card-icon {
  width: 44px; height: 44px; border-radius: 12px; background: var(--jade-ghost);
  display: grid; place-items: center; margin-bottom: 16px; color: var(--jade-deep);
}
.card-icon svg { width: 26px; height: 26px; }
.card-sub { color: #8aa0aa; font-size: .8rem; letter-spacing: .06em; margin-top: -0.8em; }
.card .en { font-size: .84rem; margin-top: .2em; }
.tag {
  display: inline-block; vertical-align: 2px; margin-left: 8px;
  font-size: .68rem; font-weight: 600; letter-spacing: .05em;
  padding: 2px 9px; border-radius: 999px;
  background: #eef1f2; color: #6f8792;
}
.tag-ok { background: var(--jade-ghost); color: var(--jade-deep); }
.note { color: #7b909b; font-size: .88rem; margin-top: 2em; }

/* ---------- ethics ---------- */
.section-dark { background: var(--ink); }
.section-dark h2 { color: #fff; }
.section-dark .eyebrow { color: #79c9b9; }
.redline-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 760px) { .redline-grid { grid-template-columns: 1fr; } }
.redline {
  border: 1px solid rgba(255, 255, 255, .14); border-radius: var(--radius);
  padding: 20px 22px; color: #d9e4e6;
}
.redline p { margin-bottom: .3em; }
.redline .en { color: #8fa5ad; }
.rl-num {
  font-size: .78rem; font-weight: 700; letter-spacing: .2em;
  color: #79c9b9; display: block; margin-bottom: 8px;
}

/* ---------- contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; }
@media (max-width: 820px) { .contact-wrap { grid-template-columns: 1fr; } }
.portal-card {
  background: linear-gradient(150deg, #103a33, #0e2f33);
  color: #d9e8e4; border-radius: var(--radius); padding: 30px;
}
.portal-card h3 { color: #fff; }
.portal-card .en { color: #8fb3ab; }
.portal-card .btn-primary { margin-top: 6px; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink); color: #9db1b9;
  padding: 30px 0; font-size: .84rem;
}
.footer-inner { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: #c4d4d9; }
.site-footer .en { color: #728790; }