/* ===== GableSD 设计系统 ===== */
:root {
  --ink: #0e1f30;
  --ink-2: #16304a;
  --steel: #16456b;
  --steel-2: #2a6aa0;
  --accent: #f26a21;
  --accent-dark: #d85a16;
  --bg: #f4f7fa;
  --surface: #ffffff;
  --line: #d9e2ea;
  --muted: #5c6b7a;
  --text: #1d2d3c;
  --green: #2e9e6b;
  --red: #d64545;
  --amber: #d9921f;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 24px rgba(14, 31, 48, 0.08);
  --shadow-lg: 0 16px 40px rgba(14, 31, 48, 0.14);
  --container: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; margin: 0 0 0.5em; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--steel-2); text-decoration: none; }
img, svg { max-width: 100%; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: all 0.18s ease;
  min-height: 46px; font-family: inherit;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn-ghost { background: rgba(255, 255, 255, 0.1); color: #fff; border-color: rgba(255, 255, 255, 0.4); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.2); }
.btn-outline { background: #fff; color: var(--steel); border-color: var(--line); }
.btn-outline:hover { border-color: var(--steel-2); color: var(--steel-2); }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

/* ===== 导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); font-size: 19px; letter-spacing: 0.3px; }
.brand-mark { width: 32px; height: 32px; flex: none; }
.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--text); font-weight: 500; font-size: 15px; }
.nav-links a:hover { color: var(--steel-2); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch {
  display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden;
}
.lang-switch button {
  border: 0; background: #fff; padding: 7px 14px; cursor: pointer; font-family: inherit;
  font-size: 13px; font-weight: 600; color: var(--muted);
}
.lang-switch button.active { background: var(--steel); color: #fff; }
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; }

/* ===== Hero ===== */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-2) 55%, var(--steel) 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: 0.14;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.6) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.6) 1px, transparent 1px);
  background-size: 44px 44px;
}
.hero-inner { position: relative; padding: 92px 0 84px; max-width: 760px; }
.hero .eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: #ffd9c2; background: rgba(242, 106, 33, 0.18);
  border: 1px solid rgba(242, 106, 33, 0.45); padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { color: #fff; font-size: clamp(30px, 5vw, 48px); margin-bottom: 18px; }
.hero p.lead { font-size: clamp(16px, 2.2vw, 19px); color: #d6e2ee; max-width: 640px; margin-bottom: 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats {
  position: relative; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: rgba(255, 255, 255, 0.15); border-radius: var(--radius); overflow: hidden;
  margin-top: 56px;
}
.hero-stats .stat { background: rgba(14, 31, 48, 0.55); padding: 22px 18px; }
.hero-stats .num { font-size: clamp(24px, 3vw, 32px); font-weight: 800; color: #fff; }
.hero-stats .label { font-size: 13px; color: #b9cbdc; margin: 0; }

/* ===== 通用区块 ===== */
.section { padding: 78px 0; }
.section.alt { background: #fff; }
.section-head { max-width: 720px; margin: 0 auto 48px; text-align: center; }
.section-head .kicker { color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: 1.4px; text-transform: uppercase; margin-bottom: 10px; }
.section-head h2 { font-size: clamp(24px, 3.4vw, 34px); }
.section-head p { color: var(--muted); margin: 0; }

/* ===== 卡片网格 ===== */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; transition: all 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #c4d2df; }
.card .icon {
  width: 48px; height: 48px; border-radius: 10px; display: flex; align-items: center;
  justify-content: center; background: rgba(22, 69, 107, 0.1); color: var(--steel); margin-bottom: 18px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; margin: 0; }
.card ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.card ul li { margin-bottom: 6px; }

/* ===== 流程 ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 22px; }
.step .step-no {
  counter-increment: step; width: 40px; height: 40px; border-radius: 50%;
  background: var(--steel); color: #fff; font-weight: 800; display: flex; align-items: center;
  justify-content: center; margin-bottom: 16px; font-size: 17px;
}
.step .step-no::before { content: counter(step); }
.step h3 { font-size: 16px; }
.step p { font-size: 14px; color: var(--muted); margin: 0; }

/* ===== 规范徽章 ===== */
.code-badges { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.code-badge {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 16px; text-align: center;
}
.code-badge .abbr { font-size: 22px; font-weight: 800; color: var(--steel); letter-spacing: 0.5px; }
.code-badge .name { font-size: 13px; color: var(--muted); margin: 6px 0 0; }
.code-badges-two { grid-template-columns: repeat(2, 1fr); max-width: 560px; margin: 0 auto; }

/* ===== 案例数据 ===== */
.case-card { background: var(--ink); color: #fff; border-radius: var(--radius); padding: 30px 26px; }
.case-card h3 { color: #fff; font-size: 17px; margin-bottom: 18px; }
.case-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.case-metrics .m .v { font-size: 24px; font-weight: 800; color: #ffb38f; }
.case-metrics .m .k { font-size: 12.5px; color: #b9cbdc; margin: 0; }
.case-note { font-size: 13px; color: #9fb4c7; margin: 18px 0 0; }

/* ===== 估算报告示例 ===== */
.sample-report {
  max-width: 880px; margin: 0 auto;
  background: var(--ink); color: #fff; border-radius: 16px;
  padding: 34px 36px; box-shadow: var(--shadow-lg);
}
.sample-head {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding-bottom: 22px; margin-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}
.sample-tag {
  font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: #ffd9c2; background: rgba(242, 106, 33, 0.2);
  border: 1px solid rgba(242, 106, 33, 0.45);
  padding: 5px 12px; border-radius: 999px;
}
.sample-spec { font-size: 15px; font-weight: 600; color: #d6e2ee; }
.sample-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.sample-metrics .sm .v { font-size: clamp(24px, 3vw, 32px); font-weight: 800; color: #ffb38f; }
.sample-metrics .sm .k { font-size: 13px; color: #b9cbdc; margin: 4px 0 0; }
.sample-note { font-size: 13px; color: #9fb4c7; margin: 24px 0 0; }

/* ===== 能力范围 ===== */
.scope-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px;
  max-width: 1000px; margin: 0 auto;
}
.scope-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 14px; text-align: center;
  font-size: 14px; font-weight: 600; color: var(--ink-2);
}
.scope-privacy {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  max-width: 720px; margin: 28px auto 0; text-align: center;
  color: var(--muted); font-size: 14px;
}
.scope-privacy svg { color: var(--green); flex: none; }

/* ===== CTA 条 ===== */
.cta-band {
  background: linear-gradient(120deg, var(--steel), var(--steel-2));
  border-radius: 16px; padding: 46px 40px; color: #fff;
  display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin-bottom: 6px; }
.cta-band p { color: #d3e2f0; margin: 0; }

/* ===== 表单 ===== */
.form-shell {
  background: #fff; border: 1px solid var(--line); border-radius: 16px;
  padding: 36px 32px; box-shadow: var(--shadow); max-width: 860px; margin: 0 auto;
}
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
/* 两个字段显式同行（檐高+坡度、风速+单位、升降温） */
.field-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 20px; }
.field-row .field { min-width: 0; }
.field-grow { grid-column: span 1; }
.field-narrow { grid-column: span 1; }
.field-hint { font-size: 12.5px; color: var(--muted); margin: 0; line-height: 1.4; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 600; color: var(--ink); }
.field label .req { color: var(--accent); }
.field label .label-hint { font-weight: 400; font-size: 12.5px; color: var(--muted); margin-left: 2px; }
.field .hint { font-size: 12.5px; color: var(--muted); margin: 0; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 15px; color: var(--text); background: #fff; transition: border-color 0.15s;
}
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--steel-2); box-shadow: 0 0 0 3px rgba(42, 106, 160, 0.14);
}
.field.invalid input, .field.invalid select { border-color: var(--red); }
.field .error-text { font-size: 12.5px; color: var(--red); margin: 0; display: none; }
.field.invalid .error-text { display: block; }

/* ===== 高级选项折叠（details/summary） ===== */
.advanced {
  margin: 26px 0; border: 1px solid var(--line); border-radius: var(--radius);
  background: #f8fafc; overflow: hidden;
}
.advanced > summary {
  list-style: none; cursor: pointer; padding: 15px 18px;
  display: flex; align-items: center; gap: 12px; user-select: none;
  font-weight: 700; color: var(--ink); font-size: 15px;
}
.advanced > summary::-webkit-details-marker { display: none; }
.advanced > summary::after {
  content: ""; margin-left: auto; width: 9px; height: 9px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform 0.18s ease;
}
.advanced[open] > summary::after { transform: rotate(-135deg); }
.advanced-sub { font-weight: 500; font-size: 13px; color: var(--muted); }
.advanced-body { padding: 4px 18px 20px; }
.advanced-body h4 {
  font-size: 13px; letter-spacing: 0.5px; text-transform: uppercase;
  color: var(--steel-2); margin: 18px 0 12px;
}
.advanced-body h4:first-child { margin-top: 6px; }

/* ===== 提示/徽章 ===== */
.alert { border-radius: var(--radius-sm); padding: 14px 16px; font-size: 14px; margin-bottom: 20px; border: 1px solid transparent; }
.alert-success { background: #e8f6ef; color: #1f7a52; border-color: #b6e0cb; }
.alert-error { background: #fbe9e9; color: #b33535; border-color: #f0c4c4; }
.alert-info { background: #e9f1f8; color: var(--steel); border-color: #c6dbee; }
.badge { display: inline-block; padding: 5px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 700; }
.badge-submitted { background: #e9f1f8; color: var(--steel); }
.badge-reviewing { background: #fdf3e0; color: var(--amber); }
.badge-in_progress { background: #ede7fb; color: #6a4bb0; }
.badge-delivered { background: #e8f6ef; color: var(--green); }
.badge-cancelled { background: #f0f2f5; color: var(--muted); }
.badge-processing { background: #e7f0fb; color: #2f649e; }
.badge-completed { background: #e8f6ef; color: var(--green); }
.badge-needs_review { background: #fdf3e0; color: var(--amber); }
.badge-failed { background: #fbe9e9; color: #b33535; }

.result-box { margin-top: 26px; }
.result-row { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.result-row:last-child { border-bottom: 0; }
.result-row .k { color: var(--muted); flex: none; }
.result-row .v { text-align: right; font-weight: 600; color: var(--ink); word-break: break-word; }
.result-summary {
  margin: 16px 0 4px; padding: 14px 16px; border-radius: var(--radius);
  background: #f5f8fb; border: 1px solid var(--line);
  font-size: 14px; line-height: 1.6; color: var(--ink);
}
.result-summary.is-completed { background: #eef7f2; border-color: #cfe8db; }
.result-summary.is-needs_review { background: #fdf6e9; border-color: #efddbd; }
.result-summary.is-failed { background: #fbeeee; border-color: #ecc9c9; }

/* ===== 页面价值主张区（深色） ===== */
.page-head {
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-2) 55%, var(--steel) 100%);
  padding: 66px 0 62px;
}
.page-head::before {
  content: ""; position: absolute; inset: 0; opacity: 0.12;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.6) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.6) 1px, transparent 1px);
  background-size: 44px 44px;
}
.page-head .container { position: relative; }
.page-head .ph-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1.4px;
  text-transform: uppercase; color: #ffd9c2; background: rgba(242, 106, 33, 0.18);
  border: 1px solid rgba(242, 106, 33, 0.45); padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.page-head h1 {
  color: #fff; font-size: clamp(28px, 4.6vw, 44px); line-height: 1.22;
  margin-bottom: 16px; max-width: 840px;
}
.page-head p.ph-lead {
  color: #d6e2ee; font-size: clamp(15px, 1.8vw, 17.5px); line-height: 1.75;
  max-width: 740px; margin: 0 0 28px;
}
.page-head .ph-points { display: flex; flex-wrap: wrap; gap: 12px; }
.page-head .ph-points span {
  font-size: 14px; font-weight: 600; color: #eaf1f8;
  background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 8px 18px; border-radius: 999px;
}
.breadcrumb { font-size: 13px; color: #9fb4c7; margin-bottom: 14px; }
.breadcrumb a { color: #cfe0f0; }

/* ===== 下单工作区（左右两栏） ===== */
.order-workspace { padding: 48px 0 72px; }
.order-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}
.order-left, .order-right { min-width: 0; }
.order-intro { margin-bottom: 22px; }
.order-intro h1 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 8px; }
.order-intro p { color: var(--muted); margin: 0; font-size: 15px; }
.order-intro .order-about { color: var(--text); line-height: 1.75; margin-bottom: 8px; }
.order-left .form-shell { max-width: none; margin: 0; padding: 30px 28px; }

.order-right { position: sticky; top: 20px; }
.preview-panel {
  background: #fff; border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow); overflow: hidden;
}
.preview-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 14px 18px;
  background: linear-gradient(135deg, var(--ink), var(--steel));
}
.preview-title { font-weight: 700; color: #fff; font-size: 15px; }
.preview-hint { font-size: 12.5px; color: #b9cddd; white-space: nowrap; }
.preview-canvas { position: relative; height: 520px; width: 100%; }
.preview-canvas canvas { display: block; width: 100%; height: 100%; }

/* ===== 页脚 ===== */
.site-footer { background: var(--ink); color: #b9cbdc; padding: 60px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 40px; }
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 9px; }
.site-footer a { color: #b9cbdc; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.site-footer p { font-size: 14px; color: #9fb4c7; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12); padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: #8aa3b8;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .code-badges { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .sample-metrics { grid-template-columns: repeat(2, 1fr); }
  .scope-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 960px) {
  .order-layout { grid-template-columns: 1fr; gap: 24px; }
  .order-right { position: static; }
  .preview-canvas { height: 440px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-toggle { display: block; }
  .nav.mobile-open { flex-wrap: wrap; height: auto; padding: 12px 0; }
  .nav.mobile-open .nav-links {
    display: flex; flex-direction: column; align-items: flex-start; gap: 16px;
    width: 100%; padding: 10px 0 6px;
  }
  .nav.mobile-open .nav-actions { width: 100%; }
  .hero-inner { padding: 64px 0 56px; }
  .page-head { padding: 44px 0 42px; }
  .page-head .ph-points { gap: 8px; }
  .page-head .ph-points span { padding: 7px 14px; font-size: 13px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 56px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; margin-bottom: 0; gap: 20px; }
  .form-shell { padding: 26px 20px; }
  .cta-band { padding: 32px 24px; flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; }
  .sample-report { padding: 26px 22px; }
  .scope-grid { grid-template-columns: 1fr; }
  .code-badges-two { grid-template-columns: 1fr; max-width: 320px; }
  .preview-canvas { height: 380px; }
  .order-left .form-shell { padding: 26px 20px; }
  .order-workspace { padding: 32px 0 56px; }
}

/* ============================================================
   极简工具页（order）：点进去即工具，无厚重网站头尾
   ============================================================ */
.app-page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
}

/* 极简顶栏 */
.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 28px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.app-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
}
.app-brand .brand-mark { width: 28px; height: 28px; }

/* 主区 */
.app-main { flex: 1; }
.app-inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 30px 28px 44px;
}

/* 顶部几行介绍 */
.app-hero { margin-bottom: 24px; }
.app-hero h1 {
  font-size: clamp(22px, 2.6vw, 30px);
  margin: 0 0 6px;
}
.app-eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent-dark);
  background: rgba(242, 106, 33, 0.1);
  padding: 4px 11px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.app-about {
  color: var(--text);
  font-size: 15px;
  line-height: 1.75;
  max-width: 840px;
  margin: 4px 0 10px;
}
.app-tip { color: var(--muted); font-size: 14.5px; margin: 0; }

/* 左右两栏：左参数、右三维 */
.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}
.app-form-col, .app-view-col { min-width: 0; }

/* 左：表单容器 */
.app-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px 26px 28px;
  box-shadow: var(--shadow);
}
.app-fields {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 22px;
}
.app-fields .field { min-width: 0; }
.app-fields .field-wide { grid-column: 1 / -1; }

/* 右：三维 sticky，与表单等高观感 */
.app-view-col { position: sticky; top: 20px; }
.app-view-col .preview-canvas { height: 560px; }
.app-view-col .preview-panel { height: 100%; }

/* 极简底部 */
.app-footer {
  text-align: center;
  padding: 16px;
  font-size: 12.5px;
  color: var(--muted);
  background: #fff;
  border-top: 1px solid var(--line);
}

/* 响应式：窄屏堆叠 */
@media (max-width: 960px) {
  .app-grid { grid-template-columns: 1fr; gap: 24px; }
  .app-view-col { position: static; }
  .app-view-col .preview-canvas { height: 440px; }
}
@media (max-width: 768px) {
  .app-topbar { padding: 11px 16px; }
  .app-inner { padding: 24px 16px 32px; }
  .app-fields { grid-template-columns: 1fr; gap: 16px; }
  .app-form { padding: 22px 18px 24px; }
  .app-view-col .preview-canvas { height: 360px; }
}