:root {
  --bg: #f4f3ee;
  --surface: #ffffff;
  --surface-soft: #f8f7f1;
  --ink: #172425;
  --muted: #667071;
  --line: #ded8cb;
  --primary: #2e4a7d;
  --primary-dark: #1d3159;
  --primary-soft: #e9eef8;
  --accent: #d9874f;
  --green: #3f765e;
  --shadow: 0 22px 55px rgba(24, 36, 38, 0.1);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background:
    linear-gradient(135deg, rgba(46, 74, 125, 0.08), transparent 32rem),
    linear-gradient(180deg, #fbfaf7 0%, var(--bg) 100%);
}

button,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app {
  width: min(1500px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
}

.rail,
.coach-card,
.chat-panel,
.header,
.ability-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.rail {
  position: sticky;
  top: 22px;
  height: calc(100vh - 44px);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.mark {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--primary);
}

.mark span {
  width: 24px;
  height: 24px;
  border: 3px solid #fff;
  border-radius: 50%;
  position: relative;
}

.mark span::before,
.mark span::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--primary);
}

.mark span::before {
  left: -12px;
  top: 9px;
}

.mark span::after {
  right: -12px;
  top: 9px;
}

.rail-copy {
  display: grid;
  gap: 4px;
}

.rail-copy strong {
  font-size: 18px;
}

.rail-copy span {
  color: var(--muted);
  font-size: 13px;
}

.main {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.header {
  min-height: 156px;
  padding: 24px 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  align-items: center;
  gap: 18px;
}

.eyebrow {
  display: inline-block;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  margin-top: 8px;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.06;
  letter-spacing: 0;
}

.header p {
  max-width: 760px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 17px;
}

.compass {
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent 49%, rgba(46, 74, 125, 0.18) 50%, transparent 51%),
    linear-gradient(0deg, transparent 49%, rgba(46, 74, 125, 0.18) 50%, transparent 51%),
    radial-gradient(circle, #fff 0 28%, var(--primary-soft) 29% 100%);
  position: relative;
}

.compass span {
  position: absolute;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--primary-dark);
  font-weight: 900;
}

.compass span:nth-child(1) { left: 12px; top: calc(50% - 17px); }
.compass span:nth-child(2) { right: 12px; top: calc(50% - 17px); }
.compass span:nth-child(3) { left: calc(50% - 17px); top: 12px; }
.compass span:nth-child(4) { left: calc(50% - 17px); bottom: 12px; }

.ability-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.ability-card {
  min-height: 132px;
  padding: 16px;
  text-align: left;
  display: grid;
  gap: 8px;
  color: var(--ink);
}

.ability-card.active {
  border-color: rgba(46, 74, 125, 0.45);
  background: var(--primary-soft);
  box-shadow: 0 0 0 3px rgba(46, 74, 125, 0.08);
}

.ability-index {
  color: var(--accent);
  font-weight: 900;
  font-size: 13px;
}

.ability-card strong {
  font-size: 20px;
}

.ability-card span:last-child {
  color: var(--muted);
  line-height: 1.5;
}

.mode-line {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--muted);
}

.workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

.chat-panel {
  min-height: 650px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

.panel-head {
  padding: 16px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.panel-head h2 {
  margin-top: 4px;
  font-size: 22px;
}

.panel-head.compact {
  padding: 0;
  border-bottom: 0;
  display: grid;
  justify-content: start;
}

.ghost-btn {
  min-height: 38px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--muted);
  font-weight: 800;
}

.chat-box {
  min-height: 0;
  overflow: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hidden {
  display: none !important;
}

.case-upload {
  margin: 0 14px 14px;
  padding: 12px;
  border: 1px dashed rgba(46, 74, 125, 0.38);
  border-radius: 8px;
  background: var(--primary-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.case-upload div {
  display: grid;
  gap: 2px;
}

.case-upload strong {
  color: var(--primary-dark);
}

.case-upload span {
  color: var(--muted);
  font-size: 13px;
}

.upload-btn {
  flex: 0 0 auto;
  min-height: 38px;
  display: grid;
  place-items: center;
  padding: 0 12px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
  cursor: pointer;
}

.upload-btn input {
  display: none;
}

.welcome-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  display: grid;
  gap: 14px;
}

.welcome-map {
  height: 120px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(90deg, transparent 49%, rgba(46, 74, 125, 0.14) 50%, transparent 51%),
    linear-gradient(0deg, transparent 49%, rgba(46, 74, 125, 0.14) 50%, transparent 51%),
    #fff;
  position: relative;
}

.welcome-map span {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
}

.welcome-map span:nth-child(1) { left: 18%; top: 28%; }
.welcome-map span:nth-child(2) { left: 44%; top: 54%; background: var(--primary); }
.welcome-map span:nth-child(3) { left: 70%; top: 34%; background: var(--green); }
.welcome-map span:nth-child(4) { left: 58%; top: 72%; }

.welcome-card strong {
  font-size: 22px;
}

.welcome-card p {
  color: var(--muted);
}

.starter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.starter-list button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 8px 10px;
  color: var(--primary-dark);
}

.message-row {
  display: flex;
  gap: 10px;
}

.message-row.user {
  justify-content: flex-end;
}

.avatar {
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
}

.bubble {
  max-width: min(760px, 84%);
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  line-height: 1.75;
}

.message-row.user .bubble {
  color: #fff;
  border-color: var(--primary);
  background: var(--primary);
}

.input-bar {
  padding: 14px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 96px;
  gap: 10px;
}

textarea {
  width: 100%;
  min-height: 46px;
  max-height: 140px;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  color: var(--ink);
  background: #fff;
  outline: none;
}

textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(46, 74, 125, 0.1);
}

.send-btn {
  min-height: 46px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
}

.send-btn:disabled {
  opacity: 0.58;
  cursor: not-allowed;
}

.coach-card {
  padding: 18px;
  display: grid;
  gap: 14px;
  position: sticky;
  top: 22px;
}

.coach-card p {
  color: var(--muted);
  line-height: 1.7;
}

.guide-section {
  color: var(--primary);
  font-weight: 900;
}

.coach-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.coach-card li {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.principle-card {
  padding: 14px;
  border-radius: 8px;
  background: var(--primary-dark);
  color: #fff;
}

.principle-card p {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.82);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%) translateY(16px);
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--primary-dark);
  color: #fff;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 1120px) {
  .app {
    grid-template-columns: 1fr;
  }

  .rail {
    position: static;
    height: auto;
    flex-direction: row;
    align-items: center;
  }

  .workbench,
  .header {
    grid-template-columns: 1fr;
  }

  .compass {
    width: 180px;
  }
}

@media (max-width: 760px) {
  .app {
    padding: 12px;
  }

  .rail,
  .ability-tabs {
    grid-template-columns: 1fr;
  }

  .rail {
    display: grid;
  }

  .ability-tabs {
    display: grid;
  }

  .input-bar {
    grid-template-columns: 1fr;
  }

  .case-upload {
    display: grid;
  }

  .send-btn,
  .ghost-btn {
    width: 100%;
  }
}