:root {
  --brand-blue: #1677ff;
  --brand-blue-strong: #0b6bff;
  --brand-blue-dark: #0b1f4d;
  --brand-blue-soft: #edf5ff;
  --brand-orange: #ff9f1c;
  --brand-orange-deep: #ff8a00;
  --bg-soft: #f5f8ff;
  --text: #172033;
  --text-soft: #526071;
  --muted: #7a8798;
  --line: #dce7f7;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-solid: #ffffff;
  --shadow: 0 14px 36px rgba(25, 70, 128, 0.10);
  --shadow-strong: 0 22px 52px rgba(25, 70, 128, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  overflow-x: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 10% 10%, rgba(22, 119, 255, 0.18), transparent 380px),
    radial-gradient(circle at 86% 6%, rgba(255, 159, 28, 0.16), transparent 330px),
    linear-gradient(135deg, #edf4ff 0%, #f7faff 42%, #fff8ed 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(22, 119, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 119, 255, 0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.65), transparent 72%);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

[hidden],
.empty-state[hidden] {
  display: none !important;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1500px, calc(100% - 44px));
  margin: 24px auto 56px;
}

/* 顶部品牌主视觉 */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 210px;
  align-items: center;
  min-height: 188px;
  overflow: hidden;
  padding: 30px 54px;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 26px;
  color: #fff;
  background:
    linear-gradient(126deg, rgba(255, 159, 28, 0.96) 0 12px, transparent 13px 100%),
    radial-gradient(circle at 90% 2%, rgba(255, 176, 32, 0.30) 0 74px, transparent 75px),
    radial-gradient(circle at 18% 100%, rgba(120, 184, 255, 0.22), transparent 310px),
    linear-gradient(118deg, #071b55 0%, #095be8 48%, #238cff 100%);
  box-shadow: 0 24px 60px rgba(11, 70, 175, 0.26);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  pointer-events: none;
}

.hero::before {
  right: -120px;
  bottom: -170px;
  width: 560px;
  height: 310px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  transform: rotate(-16deg);
}

.hero::after {
  left: 46%;
  bottom: 34px;
  width: 250px;
  height: 5px;
  background: linear-gradient(90deg, transparent, rgba(255, 176, 32, 0.95), rgba(255, 255, 255, 0.68), transparent);
}

.hero-copy,
.hero-visual {
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin: 0;
  font-size: 58px;
  line-height: 1.08;
  letter-spacing: 0;
  font-weight: 900;
  text-shadow: 0 6px 18px rgba(0, 30, 100, 0.24);
}

.hero p {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 0;
  padding: 8px 16px 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  font-size: 19px;
  line-height: 1.5;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.94);
  background: rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(8px);
}

.hero p::before {
  content: "";
  width: 28px;
  height: 4px;
  border-radius: 999px;
  background: var(--brand-orange);
  box-shadow: 0 0 18px rgba(255, 176, 32, 0.55);
}

.hero-visual {
  min-height: 112px;
  opacity: 0.42;
}

.chart-card,
.clipboard {
  position: absolute;
  border-radius: 18px;
  background: linear-gradient(145deg, #f1f7ff, #bdd8ff);
  box-shadow: 0 20px 32px rgba(0, 48, 130, 0.16);
}

.chart-card {
  left: 12px;
  top: 18px;
  width: 78px;
  height: 74px;
  transform: rotate(-5deg);
}

.chart-card::before,
.clipboard::before {
  content: "";
  position: absolute;
  inset: 14px 16px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.72);
}

.chart-card span {
  position: absolute;
  z-index: 1;
  left: 26px;
  width: 28px;
  height: 5px;
  border-radius: 999px;
  background: #b8cdf2;
}

.chart-card span:nth-child(1) { top: 24px; }
.chart-card span:nth-child(2) { top: 39px; }
.chart-card span:nth-child(3) { top: 54px; }

.arrow-line {
  position: absolute;
  left: 38px;
  top: 64px;
  width: 88px;
  height: 40px;
  border-top: 7px solid var(--brand-orange);
  border-right: 7px solid var(--brand-orange);
  transform: skew(-18deg) rotate(-20deg);
  filter: drop-shadow(0 5px 8px rgba(163, 64, 0, 0.2));
}

.clipboard {
  right: 40px;
  top: 6px;
  width: 78px;
  height: 102px;
  transform: rotate(5deg);
}

.clipboard span {
  position: absolute;
  z-index: 1;
  bottom: 24px;
  width: 7px;
  border-radius: 6px 6px 0 0;
  background: #6fa1ff;
}

.clipboard span:nth-child(1) { left: 31px; height: 20px; }
.clipboard span:nth-child(2) { left: 44px; height: 38px; }
.clipboard span:nth-child(3) { left: 57px; height: 58px; }

.shield {
  position: absolute;
  right: 2px;
  bottom: 2px;
  width: 54px;
  height: 66px;
  border-radius: 16px 16px 26px 26px;
  background: linear-gradient(145deg, #ffd794, var(--brand-orange-deep));
  box-shadow: 0 18px 26px rgba(121, 53, 8, 0.16);
}

/* 页面主体布局 */
.app-layout {
  display: grid;
  grid-template-columns: 282px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  margin-top: 26px;
}

.sidebar {
  position: sticky;
  top: 20px;
  z-index: 30;
  display: grid;
  gap: 20px;
}

.control-panel,
.content-section {
  border: 1px solid rgba(198, 216, 242, 0.92);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: 0 16px 46px rgba(18, 54, 112, 0.11);
  backdrop-filter: blur(12px);
}

.control-panel {
  position: relative;
  overflow: visible;
  padding: 20px;
}

.control-panel::before,
.content-section::before {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.9), transparent);
}

.teacher-panel {
  z-index: 40;
}

.filter-panel {
  z-index: 20;
}

.content-main {
  min-width: 0;
  display: grid;
  gap: 26px;
}

.content-section {
  position: relative;
  min-width: 0;
  padding: 24px 28px 28px;
}

.panel-title,
.field-label {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
  color: var(--brand-blue-dark);
  font-size: 17px;
  line-height: 1.2;
  font-weight: 850;
}

.panel-title {
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(220, 231, 247, 0.82);
  margin-bottom: 18px;
}

.field {
  display: block;
  margin-top: 18px;
}

.combo {
  position: relative;
}

.combo input {
  width: 100%;
  height: 50px;
  border: 1px solid #bfd4f5;
  border-radius: 14px;
  outline: none;
  padding: 0 46px 0 15px;
  color: #111827;
  background: linear-gradient(180deg, #ffffff, #f7fbff);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
}

.field:nth-of-type(1) .combo input {
  border-color: #d6e5ff;
  background: #f7fbff;
}

.field:nth-of-type(2) .combo input {
  border-color: #ffd8aa;
  background: #fffaf3;
}

.combo input:hover {
  border-color: #9bc4ff;
}

.combo input:focus {
  border-color: var(--brand-blue);
  box-shadow: 0 0 0 4px rgba(22, 119, 255, 0.12);
  background: #fff;
}

.combo-toggle {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  background: transparent;
  transition: background 0.18s, transform 0.18s;
}

.combo-toggle:hover {
  background: rgba(22, 119, 255, 0.09);
}

.combo-toggle::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 11px;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--brand-blue);
  border-bottom: 2px solid var(--brand-blue);
  transform: rotate(45deg);
  transition: transform 0.18s;
}

.combo.open .combo-toggle::before {
  top: 15px;
  transform: rotate(225deg);
}

.combo-toggle.orange::before {
  border-color: var(--brand-orange-deep);
}

.combo-menu {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 10px);
  z-index: 100;
  display: none;
  max-height: 310px;
  overflow: auto;
  padding: 8px;
  border: 1px solid #cfe0f7;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.99);
  box-shadow: 0 20px 46px rgba(27, 69, 133, 0.20);
}

.combo.open .combo-menu {
  display: grid;
  gap: 4px;
}

.combo-menu::-webkit-scrollbar {
  width: 6px;
}

.combo-menu::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: #b6c9e8;
}

.combo-menu::-webkit-scrollbar-track {
  background: transparent;
}

.combo-option {
  position: relative;
  width: 100%;
  min-height: 38px;
  border: 0;
  border-radius: 10px;
  padding: 8px 34px 8px 11px;
  text-align: left;
  background: #fff;
  cursor: pointer;
  transition: color 0.16s, background 0.16s;
}

.combo-option:hover {
  color: var(--brand-blue);
  background: #f1f7ff;
}

.combo-option.active {
  color: var(--brand-blue-strong);
  background: var(--brand-blue-soft);
  font-weight: 800;
}

.combo-option.active::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 8px;
  height: 13px;
  border-right: 2px solid var(--brand-blue);
  border-bottom: 2px solid var(--brand-blue);
  transform: translateY(-58%) rotate(45deg);
}

.filter-actions {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.primary-btn,
.secondary-btn {
  height: 50px;
  border-radius: 14px;
  padding: 0 16px;
  cursor: pointer;
  font-weight: 850;
  white-space: nowrap;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s, background 0.18s, color 0.18s;
}

.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border: 0;
  color: #fff;
  background: linear-gradient(180deg, #2687ff 0%, var(--brand-blue-strong) 100%);
  box-shadow: 0 14px 24px rgba(22, 119, 255, 0.24);
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 30px rgba(22, 119, 255, 0.30);
}

.secondary-btn {
  border: 1px solid #dbe4f0;
  color: #526071;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 7px 16px rgba(23, 32, 51, 0.04);
}

.secondary-btn:hover {
  transform: translateY(-1px);
  color: var(--brand-blue);
  border-color: #b9d5ff;
  background: #fff;
}

.icon,
.section-icon,
.search-mark,
.reset-mark {
  display: inline-block;
  flex: 0 0 auto;
}

.teacher-icon {
  width: 18px;
  height: 18px;
  border-radius: 50% 50% 45% 45%;
  background: linear-gradient(180deg, #6ca9ff, var(--brand-blue));
  box-shadow: 0 14px 0 -4px var(--brand-blue);
}

.score-icon {
  width: 22px;
  height: 22px;
  background:
    linear-gradient(var(--brand-orange), var(--brand-orange)) 2px 12px / 5px 8px no-repeat,
    linear-gradient(var(--brand-blue), var(--brand-blue)) 10px 6px / 5px 14px no-repeat,
    linear-gradient(var(--brand-blue-dark), var(--brand-blue-dark)) 18px 0 / 5px 20px no-repeat;
}

.search-mark {
  position: relative;
  width: 19px;
  height: 19px;
  border: 3px solid #fff;
  border-radius: 50%;
}

.search-mark::after {
  content: "";
  position: absolute;
  right: -7px;
  bottom: -4px;
  width: 9px;
  height: 3px;
  border-radius: 999px;
  background: #fff;
  transform: rotate(45deg);
}

.reset-mark {
  width: 17px;
  height: 17px;
  margin-right: 8px;
  vertical-align: -4px;
  border: 2px solid #667085;
  border-left-color: transparent;
  border-radius: 50%;
}

/* 内容模块与素材卡片 */
.section-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 0 0 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid rgba(220, 231, 247, 0.86);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.section-header h2 {
  margin: 0;
  color: var(--brand-blue-dark);
  font-size: 26px;
  line-height: 1.25;
  font-weight: 900;
}

.section-header p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  text-align: right;
}

.section-icon {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background:
    linear-gradient(#fff, #fff) 8px 9px / 14px 3px no-repeat,
    linear-gradient(#fff, #fff) 8px 16px / 14px 3px no-repeat,
    linear-gradient(180deg, #2a88ff, var(--brand-blue-strong));
  box-shadow: 0 10px 20px rgba(22, 119, 255, 0.20);
}

.section-icon.document {
  background:
    linear-gradient(#fff, #fff) 8px 9px / 14px 3px no-repeat,
    linear-gradient(#fff, #fff) 8px 16px / 10px 3px no-repeat,
    linear-gradient(180deg, var(--brand-orange), var(--brand-orange-deep));
  box-shadow: 0 10px 20px rgba(255, 159, 28, 0.20);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.poster-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.load-more-btn {
  grid-column: 1 / -1;
  justify-self: center;
  min-width: 180px;
  height: 48px;
  border: 1px solid #b9d5ff;
  border-radius: 14px;
  color: var(--brand-blue);
  background: #fff;
  box-shadow: 0 10px 22px rgba(22, 119, 255, 0.12);
  cursor: pointer;
  font-weight: 850;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}

.load-more-btn:hover {
  border-color: var(--brand-blue);
  transform: translateY(-1px);
  box-shadow: 0 14px 28px rgba(22, 119, 255, 0.18);
}

.image-card {
  overflow: hidden;
  border: 1px solid #d6e4f7;
  border-radius: 20px;
  background: var(--panel-solid);
  box-shadow: 0 12px 30px rgba(27, 69, 133, 0.08);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}

.image-card:hover {
  transform: translateY(-4px);
  border-color: rgba(22, 119, 255, 0.58);
  box-shadow: var(--shadow-strong);
}

.image-wrap {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  padding: 14px;
  border: 0;
  background:
    linear-gradient(135deg, rgba(22, 119, 255, 0.09), rgba(255, 176, 32, 0.07)),
    #eef5ff;
  cursor: zoom-in;
}

.poster-grid .image-wrap {
  aspect-ratio: 4 / 3;
}

.image-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-footer {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  height: 62px;
  padding: 11px 14px 11px 16px;
  border-top: 1px solid #edf2fa;
  background: rgba(255, 255, 255, 0.98);
}

.case-title {
  min-width: 0;
  color: #1d2b44;
  font-size: 16px;
  line-height: 1.35;
  font-weight: 850;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid #b7d4ff;
  border-radius: 11px;
  color: var(--brand-blue);
  background: #f7fbff;
  cursor: pointer;
  transition: background 0.16s, border-color 0.16s, transform 0.16s, box-shadow 0.16s;
}

.copy-btn:hover {
  border-color: #84b8ff;
  background: #edf5ff;
  box-shadow: 0 8px 16px rgba(22, 119, 255, 0.12);
  transform: translateY(-1px);
}

.copy-btn::before {
  content: "";
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-radius: 3px;
  box-shadow: -4px 4px 0 -2px #f7fbff, -4px 4px 0 0 currentColor;
}

.copy-btn.copying {
  opacity: 0.7;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 188px;
  gap: 8px;
  color: var(--muted);
  border: 1px dashed #bed2f0;
  border-radius: 16px;
  background: rgba(248, 251, 255, 0.78);
}

.empty-state strong {
  color: var(--brand-blue-dark);
  font-size: 20px;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  place-items: center;
  padding: 44px 28px 64px;
  background: rgba(6, 18, 42, 0.78);
}

.lightbox.open {
  display: grid;
}

.lightbox img {
  max-width: min(96vw, 1280px);
  max-height: 82vh;
  object-fit: contain;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.36);
}

.lightbox-caption {
  position: fixed;
  left: 24px;
  right: 24px;
  bottom: 18px;
  color: #fff;
  text-align: center;
  font-weight: 700;
}

.lightbox-close {
  position: fixed;
  top: 18px;
  right: 22px;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  cursor: pointer;
}

.lightbox-close::before,
.lightbox-close::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 20px;
  width: 18px;
  height: 2px;
  background: #1f2937;
}

.lightbox-close::before {
  transform: rotate(45deg);
}

.lightbox-close::after {
  transform: rotate(-45deg);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 220;
  min-width: 180px;
  padding: 12px 18px;
  border-radius: 999px;
  color: #fff;
  text-align: center;
  background: rgba(17, 32, 62, 0.92);
  box-shadow: 0 14px 34px rgba(17, 32, 62, 0.24);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(24px);
  transition: opacity 0.18s, transform 0.18s;
}

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

@media (max-width: 1180px) {
  .page-shell {
    width: min(1440px, calc(100% - 28px));
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 28px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero p {
    font-size: 17px;
  }

  .hero-visual {
    display: none;
  }

  .app-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: sticky;
    top: 0;
    grid-template-columns: 1fr 2fr;
    align-items: start;
  }

  .filter-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .filter-panel .panel-title,
  .filter-actions {
    grid-column: 1 / -1;
  }

  .field {
    margin-top: 0;
  }

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

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 20px, 1440px);
    margin-top: 10px;
  }

  .hero {
    min-height: 136px;
    padding: 22px 18px;
    border-radius: 16px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero p {
    font-size: 15px;
  }

  .sidebar,
  .filter-panel {
    position: relative;
    top: auto;
    grid-template-columns: 1fr;
  }

  .content-section {
    padding: 18px 16px 20px;
  }

  .section-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-header h2 {
    font-size: 22px;
  }

  .section-header p {
    text-align: left;
  }

  .card-grid,
  .poster-grid {
    grid-template-columns: 1fr;
  }
}