:root {
  --ai-ink: #121212;
  --ai-muted: #6c6c66;
  --ai-paper: #f5f4ef;
  --ai-line: rgba(18, 18, 18, .12);
  --ai-accent: #ff5a36;
  --ai-accent-dark: #d93b1d;
  --ai-lime: #d8ff65;
  --ai-white: #fff;
}

* { box-sizing: border-box; }

body.ai-platform-page {
  margin: 0;
  color: var(--ai-ink);
  background: var(--ai-paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

.ai-platform-page a { color: inherit; }

.ai-platform-nav {
  position: relative;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--ai-line);
  background: rgba(245, 244, 239, .94);
  backdrop-filter: blur(18px);
}

.ai-studio-nav { min-height: 64px; }

.ai-wordmark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: max-content;
  text-decoration: none;
}

.ai-wordmark-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: var(--ai-white);
  background: var(--ai-ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: -.02em;
}

.ai-wordmark > span:last-child { display: grid; gap: 2px; }
.ai-wordmark strong { font-size: 15px; line-height: 1; letter-spacing: .08em; }
.ai-wordmark small { color: var(--ai-muted); font-size: 9px; letter-spacing: .22em; }

.ai-platform-nav .nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.ai-platform-nav .nav > a {
  position: relative;
  padding: 25px 0 23px;
  color: var(--ai-muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.ai-studio-nav .nav > a { padding-top: 21px; padding-bottom: 19px; }
.ai-platform-nav .nav > a:hover,
.ai-platform-nav .nav > a.active { color: var(--ai-ink); }
.ai-platform-nav .nav > a.active::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--ai-accent);
  content: "";
}

.ai-platform-nav > .nav-login-button {
  justify-self: end;
  min-height: 40px;
  padding: 0 18px;
  border: 1px solid var(--ai-ink);
  border-radius: 0;
  color: var(--ai-white);
  background: var(--ai-ink);
  font-weight: 700;
}

.ai-platform-nav .nav #user-badge-container:empty { display: none; }
.ai-platform-nav #user-badge { margin-left: 0; }

.ai-hero {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(520px, 1.1fr);
  gap: 5vw;
  min-height: auto;
  padding: clamp(76px, 8vw, 110px) 5vw 80px;
  overflow: hidden;
}

.ai-hero-copy {
  display: flex;
  align-self: start;
  flex-direction: column;
  max-width: 680px;
}

.ai-eyebrow {
  margin: 0 0 20px;
  color: var(--ai-accent-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .24em;
  text-transform: uppercase;
}

.ai-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(54px, 6.3vw, 92px);
  font-weight: 780;
  letter-spacing: -.065em;
  line-height: .98;
}

.ai-hero-lead {
  max-width: 620px;
  margin: 34px 0 0;
  color: var(--ai-muted);
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.8;
}

.ai-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 38px;
}

.ai-primary-action,
.ai-secondary-action {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 0 24px;
  border: 1px solid var(--ai-ink);
  border-radius: 0;
  font: inherit;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}

.ai-primary-action { color: var(--ai-white) !important; background: var(--ai-ink); }
.ai-primary-action:hover,
.ai-secondary-action:hover { transform: translateY(-2px); }
.ai-primary-action:hover { background: var(--ai-accent-dark); }
.ai-secondary-action { color: var(--ai-ink); background: transparent; }
.ai-primary-action.compact,
.ai-secondary-action.compact { min-height: 44px; padding: 0 18px; }
.ai-primary-action.light { border-color: var(--ai-white); color: var(--ai-ink) !important; background: var(--ai-white); }

.ai-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin-top: 48px;
  color: var(--ai-muted);
  font-size: 12px;
}

.ai-hero-meta span::before {
  display: inline-block;
  width: 5px;
  height: 5px;
  margin: 0 9px 2px 0;
  border-radius: 50%;
  background: var(--ai-accent);
  content: "";
}

.ai-hero-visual {
  position: relative;
  align-self: start;
  min-height: 590px;
  background: #d9d7cf;
  isolation: isolate;
}

.ai-visual-grid {
  position: absolute;
  inset: 0;
  opacity: .22;
  background-image: linear-gradient(rgba(18,18,18,.2) 1px, transparent 1px), linear-gradient(90deg, rgba(18,18,18,.2) 1px, transparent 1px);
  background-size: 38px 38px;
}

.ai-stage-card {
  position: absolute;
  border: 1px solid rgba(255,255,255,.5);
  background: rgba(255,255,255,.78);
  box-shadow: 0 30px 80px rgba(39, 36, 28, .18);
  backdrop-filter: blur(16px);
}

.ai-stage-main { inset: 55px 54px 74px 48px; overflow: hidden; }

.ai-stage-toolbar {
  display: flex;
  height: 45px;
  align-items: center;
  gap: 7px;
  padding: 0 15px;
  border-bottom: 1px solid var(--ai-line);
  color: var(--ai-muted);
  font-size: 9px;
  letter-spacing: .12em;
}

.ai-stage-toolbar i { width: 7px; height: 7px; border-radius: 50%; background: #c6c4bc; }
.ai-stage-toolbar i:first-child { background: var(--ai-accent); }
.ai-stage-toolbar span { margin-left: auto; }

.ai-stage-scene {
  position: relative;
  height: calc(100% - 105px);
  overflow: hidden;
  background: linear-gradient(145deg, #373b3c 0 32%, #a9aca9 32% 62%, #555958 62%);
}

.ai-booth-wall { position: absolute; top: 17%; right: 11%; bottom: 13%; left: 13%; transform: skewY(-3deg); background: linear-gradient(120deg, #edece6 0 54%, #b8bdbb 54%); box-shadow: -18px 20px 40px rgba(0,0,0,.28); }
.ai-booth-panel { position: absolute; top: 30%; right: 24%; width: 29%; height: 31%; border: 2px solid rgba(255,255,255,.45); background: linear-gradient(135deg, #ff724e, #cf2e17); box-shadow: 0 20px 32px rgba(0,0,0,.26); }
.ai-booth-panel::after { position: absolute; top: 50%; left: 50%; color: #fff; font-size: 18px; font-weight: 800; letter-spacing: .12em; content: "BRAND"; transform: translate(-50%,-50%); }
.ai-booth-floor { position: absolute; right: -10%; bottom: -18%; left: -10%; height: 47%; transform: perspective(400px) rotateX(58deg); background: repeating-linear-gradient(90deg, rgba(255,255,255,.16) 0 1px, transparent 1px 55px), #d6d4cb; }
.ai-booth-light { position: absolute; top: 10%; width: 3px; height: 74%; background: linear-gradient(#fff, transparent); box-shadow: 0 0 28px 8px rgba(255,255,255,.25); }
.ai-booth-light.one { left: 29%; transform: rotate(12deg); }
.ai-booth-light.two { right: 18%; transform: rotate(-9deg); }

.ai-stage-caption {
  display: flex;
  height: 60px;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
}

.ai-stage-caption strong { font-size: 14px; }
.ai-stage-caption span { color: var(--ai-muted); font-size: 10px; }

.ai-floating-card {
  position: absolute;
  z-index: 3;
  display: grid;
  gap: 7px;
  min-width: 210px;
  padding: 18px;
  border: 1px solid rgba(255,255,255,.65);
  background: rgba(255,255,255,.88);
  box-shadow: 0 18px 40px rgba(32,29,22,.16);
  backdrop-filter: blur(18px);
}

.ai-floating-card small { color: var(--ai-accent-dark); font-size: 9px; font-weight: 800; letter-spacing: .15em; }
.ai-floating-card strong { font-size: 13px; }
.ai-floating-card span { color: var(--ai-muted); font-size: 10px; }
.ai-brief-card { top: 22px; right: 16px; }
.ai-result-card { right: 18px; bottom: 22px; }
.ai-result-card b { display: inline-block; width: 7px; height: 7px; margin-right: 6px; border-radius: 50%; background: #42a765; box-shadow: 0 0 0 5px rgba(66,167,101,.12); }

.ai-workflow {
  padding: 110px 5vw;
  border-top: 1px solid var(--ai-line);
  background: var(--ai-white);
}

.ai-section-heading { display: grid; grid-template-columns: .55fr 1.45fr; align-items: start; }
.ai-section-heading h2 { max-width: 900px; margin: 0; font-size: clamp(36px, 4vw, 62px); letter-spacing: -.045em; line-height: 1.08; }
.ai-workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 72px; background: var(--ai-line); border: 1px solid var(--ai-line); }
.ai-workflow-grid article { min-height: 270px; padding: 32px; background: var(--ai-white); }
.ai-workflow-grid article > span { color: var(--ai-accent-dark); font-size: 11px; font-weight: 800; }
.ai-workflow-grid h3 { margin: 64px 0 14px; font-size: 23px; }
.ai-workflow-grid p { margin: 0; color: var(--ai-muted); font-size: 14px; line-height: 1.8; }

.ai-focus-banner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  margin: 0 5vw 80px;
  padding: 64px;
  color: var(--ai-white);
  background: var(--ai-ink);
}

.ai-focus-banner .ai-eyebrow { color: var(--ai-lime); }
.ai-focus-banner h2 { max-width: 720px; margin: 0; font-size: clamp(36px, 4.6vw, 66px); letter-spacing: -.05em; line-height: 1.04; }
.ai-platform-footer { display: flex; justify-content: space-between; padding: 26px 5vw; border-top: 1px solid var(--ai-line); color: var(--ai-muted); font-size: 12px; }

.design-page.ai-platform-page { height: 100vh; overflow: hidden; background: #fff; }
.design-page .design-canvas-shell { height: 100vh; min-height: 0; margin: 0; padding: 0; }
.design-page .design-canvas-shell iframe { display: block; width: 100%; height: 100%; border: 0; }

.account-shell { width: min(1180px, 92vw); margin: 0 auto; padding: 72px 0 100px; }
.account-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; padding-bottom: 42px; border-bottom: 1px solid var(--ai-line); }
.account-heading h1 { margin: 0; font-size: clamp(48px, 6vw, 76px); letter-spacing: -.06em; }
.account-heading p:last-child { margin: 15px 0 0; color: var(--ai-muted); }
.account-login-state { max-width: 620px; margin: 90px auto 0; padding: 70px 40px; border: 1px solid var(--ai-line); text-align: center; background: var(--ai-white); }
.account-empty-icon { display: grid; width: 54px; height: 54px; margin: 0 auto 24px; place-items: center; color: #fff; background: var(--ai-ink); font-weight: 800; }
.account-login-state h2 { margin: 0 0 10px; font-size: 28px; }
.account-login-state p { margin: 0 auto 28px; color: var(--ai-muted); line-height: 1.7; }

.account-summary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 42px 0 24px; border: 1px solid var(--ai-line); background: var(--ai-line); }
.account-summary-grid article { display: grid; min-height: 180px; align-content: space-between; padding: 28px; background: var(--ai-white); }
.account-summary-grid small { color: var(--ai-muted); font-size: 11px; font-weight: 700; letter-spacing: .08em; }
.account-summary-grid strong { font-size: 38px; letter-spacing: -.04em; }
.account-summary-grid span { color: var(--ai-muted); font-size: 12px; }

.account-content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.account-panel { padding: 30px; border: 1px solid var(--ai-line); background: var(--ai-white); }
.account-activity-panel { grid-column: 1 / -1; }
.account-panel-head { display: flex; align-items: start; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
.account-panel-head small { color: var(--ai-accent-dark); font-size: 9px; font-weight: 800; letter-spacing: .2em; }
.account-panel-head h2 { margin: 5px 0 0; font-size: 24px; }
#account-role-badge { padding: 6px 9px; color: var(--ai-muted); background: var(--ai-paper); font-size: 11px; font-weight: 700; }

.account-form { display: grid; gap: 18px; }
.account-form label { display: grid; gap: 8px; color: var(--ai-muted); font-size: 12px; font-weight: 600; }
.account-form input { width: 100%; height: 46px; padding: 0 13px; border: 1px solid var(--ai-line); border-radius: 0; outline: none; color: var(--ai-ink); background: #fbfbf8; font: inherit; font-size: 14px; }
.account-form input:focus { border-color: var(--ai-ink); }
.account-form input:disabled { color: var(--ai-muted); background: #f1f0ea; }
.account-form button { justify-self: start; }
.account-form-message { min-height: 18px; margin: -6px 0 0; color: var(--ai-muted); font-size: 12px; }
.account-form-message[data-kind="error"] { color: #b42318; }
.account-form-message[data-kind="success"] { color: #287d45; }

.account-refresh { padding: 7px 10px; border: 1px solid var(--ai-line); color: var(--ai-muted); background: transparent; cursor: pointer; }
.account-activity-list { display: grid; }
.account-activity-item { display: grid; grid-template-columns: 1fr auto auto; gap: 20px; align-items: center; padding: 18px 0; border-top: 1px solid var(--ai-line); }
.account-activity-item:first-child { border-top: 0; }
.account-activity-item strong { font-size: 14px; }
.account-activity-item small { display: block; margin-top: 4px; color: var(--ai-muted); }
.account-activity-item .delta { font-size: 13px; font-weight: 750; }
.account-activity-item .delta.negative { color: #b42318; }
.account-activity-item time { color: var(--ai-muted); font-size: 11px; }
.account-muted { margin: 0; padding: 24px 0; color: var(--ai-muted); font-size: 13px; }

@media (max-width: 1000px) {
  .ai-platform-nav { grid-template-columns: auto 1fr; }
  .ai-platform-nav .nav { justify-self: end; gap: 18px; }
  .ai-platform-nav > .nav-login-button { display: none; }
  .ai-hero { grid-template-columns: 1fr; padding-top: 64px; }
  .ai-hero-visual { min-height: 540px; }
  .ai-section-heading { grid-template-columns: 1fr; gap: 10px; }
}

@media (max-width: 720px) {
  .ai-platform-nav { min-height: 62px; padding: 0 18px; }
  .ai-wordmark small { display: none; }
  .ai-platform-nav .nav { gap: 14px; }
  .ai-platform-nav .nav > a { padding: 21px 0 19px; font-size: 12px; }
  .ai-platform-nav #user-badge .nav-user-copy { display: none; }
  .ai-hero { grid-template-columns: minmax(0,1fr); min-height: auto; padding: 55px 20px 60px; }
  .ai-hero h1 { font-size: 48px; }
  .ai-hero-visual { min-height: 430px; }
  .ai-stage-main { inset: 42px 20px 55px; }
  .ai-floating-card { min-width: 165px; padding: 13px; }
  .ai-brief-card { right: 5px; }
  .ai-result-card { right: 6px; bottom: 15px; }
  .ai-workflow { padding: 75px 20px; }
  .ai-workflow-grid { grid-template-columns: 1fr; margin-top: 42px; }
  .ai-workflow-grid article { min-height: 220px; }
  .ai-workflow-grid h3 { margin-top: 40px; }
  .ai-focus-banner { align-items: start; flex-direction: column; margin: 0 20px 50px; padding: 36px 28px; }
  .ai-platform-footer { align-items: start; flex-direction: column; gap: 7px; padding: 24px 20px; }
  .design-page .design-canvas-shell { height: 100vh; }
  .account-shell { width: auto; padding: 48px 20px 70px; }
  .account-heading { align-items: start; flex-direction: column; }
  .account-summary-grid,
  .account-content-grid { grid-template-columns: 1fr; }
  .account-activity-panel { grid-column: auto; }
  .account-activity-item { grid-template-columns: 1fr auto; }
  .account-activity-item time { grid-column: 1 / -1; }
}