/* ==========================================================================
   AntaTech — 红橙色系简约再设计
   设计参考 gttechnologysolutions.com 的信息架构（token 驱动 + 深色底 + 强调色）
   配色、排版、组件与文案均为重新设计
   ========================================================================== */

:root {
  /* 底色：偏暖的近黑，让橙色显得"发光"而不是贴在中性灰上 */
  --bg:       #150b07;
  --bg-2:     #1f110a;
  --bg-3:     #2b1810;

  /* 强调色：橙为主，红为辅 */
  --accent:       #ff5a1f;
  --accent-hover: #ff7a45;
  --accent-2:     #e01e37;
  --grad: linear-gradient(135deg, #ff5a1f 0%, #e01e37 100%);

  --fg:     #fdf6f2;
  --muted:  #ad958a;
  --border: #382117;

  /* 橙底上用近黑文字：对比 5.9:1，白字只有 3.1:1 达不到 AA */
  --on-accent: #1a0d06;

  --radius:   10px;
  --radius-l: 16px;
  --wrap:     1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* 全局 img{display:block} 会覆盖 hidden 属性，必须显式压回去 */
[hidden] { display: none !important; }
a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-hover); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

/* ============================== NAV ============================== */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(21, 11, 7, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 15px 24px;
  display: flex; align-items: center; gap: 28px;
}

/* 纯 CSS 字标，不依赖图片资源 */
.brand {
  display: flex; align-items: center; gap: 9px;
  color: var(--fg); font-weight: 800; letter-spacing: -.02em; font-size: 17px;
  margin-right: auto;
}
.brand:hover { color: var(--fg); }
.brand img { height: 26px; width: auto; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: var(--grad);
  display: grid; place-items: center;
  color: var(--on-accent); font-size: 14px; font-weight: 900;
}

.nav-links { display: flex; gap: 30px; }
.nav-links a {
  color: var(--muted);
  font-size: 12px; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
}
.nav-links a:hover { color: var(--fg); }

/* ============================== BUTTONS ============================== */

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 13px; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase;
  transition: transform .15s, background .15s, border-color .15s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--on-accent);
  transform: translateY(-1px);
}
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--fg);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--fg);
  transform: translateY(-1px);
}
.btn-sm { padding: 10px 20px; }

/* ============================== HERO ============================== */

.hero {
  padding: 116px 24px 124px;
  background:
    radial-gradient(at 78% 12%, rgba(255, 90, 31, .26) 0%, transparent 56%),
    radial-gradient(at 6% 88%, rgba(224, 30, 55, .18) 0%, transparent 52%),
    var(--bg);
}
.hero-in { max-width: var(--wrap); margin: 0 auto; }

.hero h1 {
  font-size: clamp(38px, 6.2vw, 68px);
  line-height: 1.04;
  letter-spacing: -.03em;
  font-weight: 800;
  max-width: 17ch;
}
.hero h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  color: var(--muted);
  font-size: 18px;
  max-width: 56ch;
  margin: 24px 0 36px;
}
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; }

/* ============================== SECTIONS ============================== */

.section { padding: 100px 24px; }
.section-alt { background: var(--bg-2); }
.section-in { max-width: var(--wrap); margin: 0 auto; }

.section-head { margin-bottom: 52px; }
.section-head h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 800;
}
.section-head p {
  color: var(--muted);
  font-size: 17px;
  max-width: 58ch;
  margin-top: 16px;
}

/* ============================== SERVICES ============================== */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: 28px 26px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); }
.card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; }

.card-icon {
  width: 42px; height: 42px;
  border-radius: 11px;
  background: rgba(255, 90, 31, .13);
  border: 1px solid rgba(255, 90, 31, .28);
  display: grid; place-items: center;
  margin-bottom: 18px;
}
.card-icon svg { width: 21px; height: 21px; stroke: var(--accent); fill: none; }

/* --- 整张卡作为链接：撑满网格单元并保持等高 --- */
.card-link {
  display: flex;
  height: 100%;
  color: inherit;
  text-decoration: none;
}
.card-link:hover { color: inherit; }
.card-link > .card {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
}
/* 标题行数不一致时，描述仍贴底对齐 */
.card-link > .card > p { margin-top: auto; }

/* 可点击的提示：悬停时右上角箭头浮现 */
.card-link > .card { position: relative; }
.card-link > .card::after {
  content: "\2192";
  position: absolute;
  top: 22px; right: 22px;
  color: var(--accent);
  font-size: 17px;
  line-height: 1;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity .2s, transform .2s;
}
.card-link:hover > .card::after,
.card-link:focus-visible > .card::after { opacity: 1; transform: translateX(0); }

/* ============================== STATS ============================== */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 44px 0;
}
.stat-n {
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
}
.stat-l {
  color: var(--muted);
  font-size: 12px; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
  margin-top: 8px;
}

/* ============================== PRICING ============================== */

.price-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: 32px 28px;
  display: flex; flex-direction: column;
}
.price-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(255, 90, 31, .09) 0%, var(--bg-3) 60%);
}
.price-tag {
  display: inline-block;
  align-self: flex-start;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 10px; font-weight: 800;
  letter-spacing: .14em; text-transform: uppercase;
  padding: 4px 10px; border-radius: 999px;
  margin-bottom: 16px;
}
.price-card h3 { font-size: 15px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.price-v { font-size: 40px; font-weight: 800; letter-spacing: -.03em; margin: 12px 0 4px; }
.price-v span { font-size: 15px; font-weight: 600; color: var(--muted); letter-spacing: 0; }
.price-card > p { color: var(--muted); font-size: 14.5px; margin-bottom: 22px; }

.price-list { list-style: none; display: grid; gap: 11px; margin-bottom: 28px; }
.price-list li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 14.5px; color: var(--fg);
}
.price-list svg {
  width: 16px; height: 16px; flex: none; margin-top: 4px;
  stroke: var(--accent); fill: none;
}
.price-card .btn { margin-top: auto; text-align: center; }

/* ============================== CTA ============================== */

.cta {
  background: var(--grad);
  border-radius: 20px;
  padding: 56px 40px;
  text-align: center;
  color: var(--on-accent);
}
.cta h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 800;
  max-width: 22ch;
  margin: 0 auto;
}
.cta p {
  margin: 14px auto 30px;
  max-width: 48ch;
  font-size: 16.5px;
  opacity: .82;
}
.cta .btn {
  background: var(--on-accent);
  color: var(--fg);
}
.cta .btn:hover { background: #000; color: var(--fg); }

/* ============================== FOOTER ============================== */

.footer {
  border-top: 1px solid var(--border);
  padding: 56px 24px 32px;
  background: var(--bg-2);
}
.footer-in {
  max-width: var(--wrap); margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 40px;
}
.footer h4 {
  font-size: 11px; font-weight: 800;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.footer ul { list-style: none; display: grid; gap: 9px; }
.footer ul a, .footer-note { color: var(--muted); font-size: 14.5px; }
.footer ul a:hover { color: var(--accent); }
.footer-note { max-width: 42ch; margin-top: 14px; }
.footer-bottom {
  max-width: var(--wrap); margin: 44px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px;
}

/* ============================== CONTACT ============================== */

.contact-card h3 { letter-spacing: 0; text-transform: none; }
.contact-card p { font-size: 15px; }
.contact-card a { color: var(--accent); }
.contact-card a:hover { color: var(--accent-hover); }

.addr {
  font-style: normal;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.55;
  display: grid;
  gap: 1px;
}

/* ============================== MISC ============================== */

/* 让版块与相邻版块贴合（原先是内联 style，抽出来才能上严格 CSP） */
.section-flush { padding-top: 0; padding-bottom: 0; }

.price-note {
  color: var(--muted);
  font-size: 13.5px;
  margin-top: 26px;
}

/* ============================== SERVICE DETAIL ============================== */

.svc-detail {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: 34px 36px;
  margin-bottom: 18px;
  /* 关键：sticky 导航实测 72px 高，锚点跳转必须留余量否则标题被盖住 */
  scroll-margin-top: 96px;
}
.svc-detail:target { border-color: var(--accent); }

.svc-detail-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.svc-detail-head .card-icon { margin-bottom: 0; flex: none; }
.svc-detail-head h3 {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.15;
}
.svc-detail > p {
  color: var(--muted);
  font-size: 16px;
  max-width: 68ch;
}

.svc-list {
  list-style: none;
  display: grid;
  gap: 9px;
  margin: 20px 0;
}
.svc-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.6;
}
/* 纯 CSS 画的空心圈标记，不额外引入图标 */
.svc-list li::before {
  content: "";
  position: absolute;
  left: 0; top: .5em;
  width: 11px; height: 11px;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.svc-fit {
  background: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 12px 16px;
  color: var(--muted);
  font-size: 14px;
}
.svc-fit strong { color: var(--fg); font-weight: 700; }

.svc-back {
  display: inline-block;
  margin-top: 26px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}
.svc-back:hover { color: var(--accent); }

/* ============================== CONTACT FORM ============================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
  align-items: start;
}
.contact-col { display: grid; gap: 18px; }

.form-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: 32px;
}

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 7px;
}
.field .req { color: var(--accent); }

.form-card input,
.form-card textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.5;
  transition: border-color .15s, box-shadow .15s;
}
.form-card textarea { min-height: 132px; resize: vertical; }
.form-card input::placeholder,
.form-card textarea::placeholder { color: #6d5a51; }

.form-card input:focus,
.form-card textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, .16);
}
/* 只在用户交互过之后才标红，避免一进页面就满屏错误 */
.form-card input:user-invalid,
.form-card textarea:user-invalid {
  border-color: var(--accent-2);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* 蜜罐：对人不可见，对读屏器也跳过，机器人却会填 */
.hp {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.form-card button[type="submit"] {
  border: none;
  cursor: pointer;
  font-family: inherit;
  width: 100%;
}
.form-card button[type="submit"][disabled] {
  opacity: .55;
  cursor: progress;
}

.form-hint {
  color: var(--muted);
  font-size: 12.5px;
  margin-top: 12px;
}

.form-status {
  margin-top: 16px;
  padding: 13px 16px;
  border-radius: var(--radius);
  font-size: 14.5px;
  border-left: 3px solid var(--accent);
  background: var(--bg);
}
.form-status[hidden] { display: none; }
.form-status strong { display: block; color: var(--fg); margin-bottom: 3px; }
.form-status.is-ok    { border-left-color: var(--accent); color: var(--muted); }
.form-status.is-error { border-left-color: var(--accent-2); color: var(--muted); }

/* ============================== RESPONSIVE ============================== */

@media (max-width: 1080px) {
  .grid-4   { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .stats    { grid-template-columns: repeat(2, 1fr); gap: 32px 18px; }
  .footer-in { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero     { padding: 76px 20px 84px; }
  .section  { padding: 72px 20px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .svc-detail { padding: 26px 22px; }
  .svc-detail-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .form-card { padding: 24px 20px; }
  .form-row  { grid-template-columns: 1fr; gap: 0; }
  .stats    { grid-template-columns: 1fr; gap: 28px; }
  .footer-in { grid-template-columns: 1fr; gap: 32px; }
  .cta      { padding: 40px 24px; border-radius: 16px; }
  .hero-ctas .btn { flex: 1 1 100%; text-align: center; }
}