:root {
  --bg-1: #edf3fb;
  --bg-2: #d8e6fa;
  --panel: #ffffff;
  --line: #bfcde0;
  --text: #10243d;
  --muted: #4f6380;
  --primary: #0b6fbe;
  --primary-dark: #08528d;
  --warn: #f2c23a;
  --danger: #d63b42;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: linear-gradient(150deg, var(--bg-1) 0%, var(--bg-2) 60%, #c8d9f0 100%);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(7, 78, 133, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(7, 78, 133, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1280px, 98vw);
  height: min(96vh, 980px);
  margin: 1.5vh auto;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
  box-shadow: 0 15px 32px rgba(8, 45, 84, 0.14);
  overflow: hidden;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(0.96);
}

.btn:disabled {
  cursor: not-allowed;
  filter: grayscale(0.2);
  opacity: 0.7;
  transform: none;
}

.btn-primary {
  background: linear-gradient(180deg, #1888e3 0%, var(--primary) 100%);
  color: #fff;
}

.btn-secondary {
  background: #768596;
  color: #fff;
}

.btn-neutral {
  background: #d4dfec;
  color: #1b4168;
}

.btn-warn {
  background: linear-gradient(180deg, #f8d871 0%, var(--warn) 100%);
  color: #4a3400;
}

.btn-danger {
  background: linear-gradient(180deg, #e9737c 0%, var(--danger) 100%);
  color: #fff;
}

.btn-small {
  font-size: 13px;
  padding: 6px 10px;
}

.login-page {
  height: 100%;
  padding: 18px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}

.login-title {
  text-align: center;
}

.login-title .eyebrow {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 44px);
  font-weight: 700;
}

.login-title h1 {
  margin: 8px 0;
  font-size: clamp(24px, 1.8vw, 34px);
}

.login-title .subtitle {
  margin: 0;
  color: var(--muted);
}

.login-form {
  width: min(860px, 100%);
  margin: 0 auto;
  background: #ecf2fa;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.login-error {
  margin: 0 0 8px;
  padding: 8px 10px;
  border: 1px solid #e5a5a5;
  border-radius: 7px;
  background: #fff1f1;
  color: #a32828;
  font-size: 13px;
}

.login-tip {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.form-grid {
  display: grid;
  grid-template-columns: 130px minmax(180px, 1fr) 110px minmax(130px, 1fr);
  gap: 10px;
  align-items: center;
}

.form-grid label {
  font-weight: 600;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #b5c7dd;
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  padding: 7px 9px;
  font-size: 14px;
}

sub {
  font-size: 0.72em;
  vertical-align: sub;
  line-height: 0;
}

input:disabled,
select:disabled,
textarea:disabled {
  background: #e1e7f0;
  color: #6f7f93;
  border-color: #c3cedd;
  cursor: not-allowed;
}

.action-row {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
}

.version {
  width: min(860px, 100%);
  margin: 0 auto;
  color: var(--muted);
  font-size: 13px;
}

.dashboard-page,
.module-page {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.topbar,
.module-header {
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 10px 14px;
}

.topbar h1,
.module-header h1 {
  margin: 0;
  font-size: clamp(22px, 1.5vw, 34px);
}

.module-header p {
  margin: 4px 0 0;
  color: #d7e8fb;
  font-size: 13px;
}

.main-tabs {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tab {
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 6px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.13);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
}

.tab.active {
  background: rgba(255, 255, 255, 0.25);
}

.module-list {
  flex: 1;
  padding: 10px;
  overflow: auto;
  display: grid;
  gap: 10px;
}

.module-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
}

.module-card header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
}

.module-card h2 {
  margin: 0;
  font-size: 20px;
}

.module-label {
  color: #dc4a00;
  font-weight: 700;
}

.module-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(172px, 1fr));
  gap: 7px;
}

.module-button {
  border-radius: 7px;
  border: 1px solid var(--line);
  padding: 8px;
  text-align: center;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
}

.module-button.is-active {
  background: #e8f4ff;
  color: #0a4f89;
  border-color: #7eb4df;
}

.module-button.is-disabled,
.module-button.is-placeholder {
  background: #eef3f9;
  color: #8398b1;
}

.status-row {
  border-top: 1px solid var(--line);
  background: #e9f1fb;
  padding: 8px 10px;
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  font-size: 13px;
}

.compact-main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 8px;
  padding: 8px;
  overflow: auto;
}

.compact-control {
  max-height: 100%;
  overflow: auto;
}

.control-card {
  background: #f3f7fd;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  display: grid;
  gap: 7px;
  align-content: start;
}

.control-card label {
  font-size: 13px;
  color: #23496f;
  font-weight: 600;
}

.control-section {
  border: 1px solid #cdd9ea;
  border-radius: 8px;
  background: #f8fbff;
  padding: 8px;
  display: grid;
  gap: 6px;
}

.control-section h3 {
  margin: 0;
  font-size: 14px;
  color: #1e4c7a;
}

.form-hint {
  margin: 0;
  color: #436688;
  font-size: 12px;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.input-row .wide-col {
  grid-column: span 2;
}

.button-group,
.button-stack {
  margin-top: 4px;
  display: grid;
  gap: 7px;
}

.button-group {
  grid-template-columns: 1fr 1fr;
}

.button-group.single {
  grid-template-columns: 1fr;
}

.button-group.system-view-buttons {
  grid-template-columns: 1fr;
}

.system-view-btn.is-active {
  outline: 2px solid #f3c33f;
}

.mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.mode-switch .btn.is-active {
  background: #0b6fbe;
  color: #fff;
}

.challenge-box {
  border: 1px dashed #8fb2d7;
  border-radius: 8px;
  padding: 8px;
  background: #f5faff;
  display: grid;
  gap: 6px;
}

.challenge-box.is-disabled {
  background: #eef3f8;
  border-color: #c1cfdd;
}

.challenge-box.is-disabled .challenge-question,
.challenge-box.is-disabled .challenge-feedback {
  color: #637a94;
}

.challenge-question,
.challenge-feedback {
  margin: 0;
  font-size: 12px;
  color: #15466f;
}

.challenge-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 6px;
}

.status-text {
  margin: 0;
  min-height: 34px;
  font-size: 12px;
  color: #1f4f7e;
}

.compact-plot {
  max-height: 100%;
  overflow: auto;
}

.plot-area {
  display: grid;
  gap: 7px;
  grid-template-rows: 1fr 1fr;
}

.plot-area.triple {
  grid-template-rows: repeat(3, 1fr);
}

.plot-grid-2x2 {
  display: grid;
  gap: 7px;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.sampling-right-area {
  display: grid;
  gap: 7px;
  grid-template-rows: minmax(150px, auto) minmax(420px, 1fr);
  min-height: 0;
}

.plot-grid-3x2 {
  display: grid;
  gap: 7px;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: repeat(3, minmax(190px, 1fr));
}

.plot-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 6px 8px;
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 0;
  position: relative;
}

.plot-card h3 {
  margin: 0 0 5px;
  font-size: 15px;
}

.plot-canvas {
  width: 100%;
  height: 100%;
  min-height: 115px;
  border: 1px solid #cfdbeb;
  border-radius: 7px;
  background: linear-gradient(180deg, #fcfdff 0%, #f0f5fc 100%);
}

.formula-board {
  min-height: 115px;
  border: 1px solid #cfdbeb;
  border-radius: 7px;
  background: #fffef6;
  padding: 10px;
  font-family: "KaiTi", "STKaiti", "Times New Roman", serif;
  white-space: pre-wrap;
  font-size: 16px;
  line-height: 1.45;
  color: #1f3852;
  overflow: auto;
}

.module-page.challenge-locked .plot-canvas,
.module-page.challenge-locked .system-log {
  visibility: hidden;
}

.module-page.challenge-locked .plot-card::after {
  content: "闯关中：请先计算并答题，答对或本题三次结束后显示结果";
  position: absolute;
  inset: 38px 8px 8px 8px;
  border: 1px dashed #92b0cf;
  border-radius: 8px;
  background: rgba(241, 247, 255, 0.95);
  color: #1f4f7e;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
}

.system-plot {
  grid-template-rows: 2fr 1fr;
}

.system-right-area {
  display: grid;
  gap: 7px;
  grid-template-rows: minmax(280px, 1.2fr) minmax(320px, 1fr);
  min-height: 0;
  overflow: auto;
}

.system-right-area .plot-area.system-plot {
  grid-template-rows: 1fr 1fr;
}

.system-right-area .plot-card {
  min-height: 0;
}

.system-right-area .formula-board {
  min-height: 230px;
  max-height: none;
  height: 100%;
  overflow: auto;
}

.system-log {
  resize: none;
  height: 100%;
  min-height: 100px;
  font-family: "Consolas", "Microsoft YaHei", sans-serif;
  font-size: 12px;
}

.tab-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tab-row .tab {
  color: #fff;
  background: #4d7397;
  border: none;
}

.placeholder-page {
  justify-content: center;
}

.placeholder-body {
  padding: 20px;
  display: grid;
  gap: 12px;
  justify-items: center;
}

.status-actions {
  display: flex;
  gap: 6px;
}

.feature-panel,
.class-data-panel {
  flex: 1;
  margin: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  overflow: auto;
}

.feature-actions {
  display: flex;
  justify-content: center;
  padding-top: 4px;
}

.resource-board {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow: hidden;
  padding: 4px;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  grid-auto-rows: minmax(68px, 1fr);
  gap: 7px;
  align-content: stretch;
  width: 100%;
  height: 100%;
}

.resource-button {
  min-width: 0;
  min-height: 68px;
  border-radius: 10px;
  border: 1px solid #bed0e5;
  background: #ffffff;
  color: #173e66;
  padding: 7px 4px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 4px;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(15, 63, 109, 0.07);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
  overflow: hidden;
}

.resource-button.is-active:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 22px rgba(11, 77, 131, 0.16);
  filter: brightness(0.98);
}

.resource-button.is-active {
  background: linear-gradient(180deg, #f8fcff 0%, #dfeeff 100%);
  border-color: #7baad6;
}

.resource-button.is-disabled {
  background: #eef3f9;
  border-style: dashed;
  color: #8093a9;
  box-shadow: none;
  cursor: default;
}

.resource-code {
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
}

.resource-name {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
}

.audio-control-card {
  gap: 10px;
}

.audio-parameter-card,
.audio-formula-card {
  border: 1px solid #cdd9ea;
  border-radius: 8px;
  background: #f8fbff;
  padding: 8px;
  display: grid;
  gap: 6px;
}

.audio-parameter-line {
  margin: 0;
  color: #244b72;
  font-size: 13px;
  line-height: 1.45;
}

.audio-formula-card h3 {
  margin: 0;
  font-size: 14px;
  color: #1e4c7a;
}

.audio-formula-board {
  min-height: 124px;
  font-size: 15px;
}

.audio-right-area {
  display: grid;
  gap: 7px;
  grid-template-rows: 1fr 1fr;
  min-height: 0;
}

.signal-decomp-control-card {
  gap: 10px;
  overflow: hidden;
}

.signal-decomp-range-section {
  gap: 8px;
}

.signal-decomp-toolbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.signal-decomp-toolbar .btn.is-active {
  background: #0b6fbe;
  color: #fff;
}

.signal-decomp-range-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  align-items: stretch;
}

.signal-decomp-control-card textarea[name="signal_expr"] {
  min-height: 38px;
  height: 38px;
  resize: none;
}

.signal-decomp-main {
  grid-template-columns: minmax(580px, 620px) minmax(0, 1fr);
}

.signal-decomp-formula-card {
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.signal-decomp-formula-board {
  min-height: 0;
  flex: 1;
  font-size: 14px;
  overflow: auto;
  white-space: normal;
}

.signal-decomp-formula-sections {
  display: grid;
  gap: 10px;
}

.signal-decomp-formula-section {
  border: 1px solid #d6e0eb;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  padding: 8px 10px;
  display: grid;
  gap: 6px;
}

.signal-decomp-formula-section h4 {
  margin: 0;
  font-size: 14px;
  color: #1e4c7a;
}

.signal-decomp-formula-pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "KaiTi", "STKaiti", "Times New Roman", serif;
  font-size: 15px;
  line-height: 1.45;
  color: #1f3852;
}

.signal-decomp-formula-note {
  margin: 0;
  color: #34597e;
  font-size: 13px;
  line-height: 1.45;
}

.signal-decomp-right-area {
  display: grid;
  gap: 7px;
  grid-template-rows: repeat(3, minmax(380px, 1fr));
  min-height: 0;
}

.signal-decomp-status {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr) max-content;
  align-items: center;
  gap: 12px;
}

.signal-decomp-footer-message {
  margin: 0;
  min-height: auto;
  text-align: center;
  color: #c7332d;
  font-weight: 700;
}

.feature-panel h2,
.class-data-head h2 {
  margin: 0;
}

.class-data-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.class-data-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.merge-message {
  margin: 0;
  color: #27517a;
  font-size: 12px;
}

.class-data-table-wrap {
  overflow: auto;
}

.class-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background: #fff;
}

.class-data-table th,
.class-data-table td {
  border: 1px solid #cad8ea;
  padding: 8px 6px;
  text-align: center;
}

.class-data-table th {
  background: #e8f1fc;
  color: #163f66;
}

.table-empty {
  color: #5e7590;
  padding: 14px 10px;
}

.class-data-panel.detail {
  overflow: hidden;
}

.detail-actions {
  display: flex;
  justify-content: flex-start;
}

@media (max-width: 1100px) {
  .app-shell {
    width: 100vw;
    height: 100vh;
    margin: 0;
    border-radius: 0;
  }

  .form-grid {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .input-row .wide-col {
    grid-column: auto;
  }

  .resource-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .compact-main {
    grid-template-columns: 1fr;
  }

  .plot-area,
  .plot-area.triple {
    grid-template-rows: none;
    grid-template-columns: 1fr;
    grid-auto-rows: minmax(190px, auto);
  }

  .plot-grid-2x2 {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, minmax(170px, auto));
  }

  .sampling-right-area {
    grid-template-rows: minmax(180px, auto) minmax(640px, auto);
  }

  .plot-grid-3x2 {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(6, minmax(180px, auto));
  }

  .system-right-area {
    grid-template-rows: minmax(260px, auto) minmax(420px, auto);
  }

  .system-right-area .plot-area.system-plot {
    grid-template-rows: repeat(2, minmax(210px, auto));
  }

  .system-right-area .formula-board {
    min-height: 240px;
  }

  .plot-card {
    min-height: 210px;
  }

  .plot-canvas {
    min-height: 170px;
  }

  .formula-board {
    min-height: 170px;
    font-size: 15px;
  }

  .resource-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .audio-right-area {
    grid-template-rows: repeat(2, minmax(210px, auto));
  }

  .signal-decomp-main {
    grid-template-columns: 1fr;
  }

  .signal-decomp-toolbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .signal-decomp-range-row {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .signal-decomp-right-area {
    grid-template-rows: repeat(3, minmax(440px, auto));
  }

  .signal-decomp-status {
    grid-template-columns: 1fr;
    justify-items: center;
  }
}

@media (max-width: 640px) {
  sub {
    font-size: 0.78em;
  }

  .module-buttons {
    grid-template-columns: repeat(auto-fill, minmax(142px, 1fr));
  }

  .button-group {
    grid-template-columns: 1fr;
  }

  .topbar h1,
  .module-header h1 {
    font-size: 24px;
  }

  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .resource-button {
    min-height: 62px;
  }
}