:root {
  --ink: #19322f;
  --muted: #61736f;
  --line: #dce8e3;
  --bg: #f6f4ef;
  --panel: #ffffff;
  --green: #0f7f78;
  --deep: #0a4749;
  --gold: #b87b22;
  --soft: #e8f4f1;
  --shadow: 0 18px 48px rgba(18, 54, 50, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
}

.hidden {
  display: none !important;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
  overflow-wrap: anywhere;
}

button,
input,
a {
  font: inherit;
  min-width: 0;
}

a {
  color: inherit;
}

.login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
  background: linear-gradient(135deg, #063235, #0d5e61 56%, #168176);
}

.login-card {
  width: 100%;
  min-width: 0;
  max-width: 480px;
  padding: 32px;
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow);
}

.login-card h1 {
  margin-bottom: 10px;
  font-size: 42px;
  line-height: 1.15;
}

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

.login-card form {
  display: grid;
  gap: 14px;
  margin: 22px 0 14px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--ink);
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  background: #fff;
  color: var(--ink);
}

button,
.material-grid a,
nav a {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
}

.login-card button {
  padding: 13px 16px;
  background: var(--green);
  color: #fff;
  font-weight: 800;
}

.hint {
  margin-bottom: 0;
  font-size: 13px;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--deep);
  font-size: 13px;
  font-weight: 800;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  padding: 42px min(6vw, 72px);
  color: #fff;
  background: linear-gradient(135deg, #063235, #0d5e61 58%, #168176);
}

.topbar .eyebrow {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #cbf4ef;
}

.topbar h1 {
  max-width: 920px;
  margin-bottom: 14px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: 0;
}

.topbar p {
  max-width: 780px;
  margin-bottom: 0;
  color: #d8f2ee;
  font-size: 18px;
}

nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav a {
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  white-space: nowrap;
}

main {
  padding: 26px min(6vw, 72px) 64px;
}

.section {
  max-width: 1180px;
  margin: 0 auto 26px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.82);
}

.section-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 22px;
}

.section-head > span {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--deep);
  color: #fff;
  font-weight: 900;
}

.section h2 {
  margin-bottom: 4px;
  font-size: 26px;
  line-height: 1.25;
}

.section-head p,
.summary-card p,
.package-card p,
.tool-card p,
.detail-card p,
.download-box p {
  color: var(--muted);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 14px;
  background: transparent;
  border: 0;
  padding: 0;
}

.summary-card,
.package-card,
.tool-card,
.detail-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

.summary-card {
  padding: 22px;
}

.summary-card.strong {
  background: var(--deep);
  color: #fff;
}

.summary-card.strong p {
  color: #d9eeea;
}

.summary-card span,
.count {
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
}

.summary-card h2 {
  margin: 8px 0 8px;
}

.package-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.package-card {
  padding: 18px;
}

.package-card h3 {
  margin: 6px 0 8px;
  font-size: 18px;
}

.mini-list,
.meta,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mini-list span,
.meta span,
.tag-row span {
  padding: 4px 8px;
  border-radius: 999px;
  background: #eef5f2;
  color: var(--deep);
  font-size: 12px;
}

.problem-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.problem-grid button,
.search-row button {
  padding: 9px 12px;
  background: var(--soft);
  color: var(--deep);
}

.search-panel {
  padding: 18px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--line);
}

.search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  margin-bottom: 14px;
}

.tool-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.tool-card {
  padding: 15px;
  text-align: left;
}

.tool-card.active {
  border-color: var(--green);
  box-shadow: var(--shadow);
}

.tool-card strong {
  display: block;
  margin-bottom: 5px;
  font-size: 17px;
}

.tool-card.empty {
  grid-column: 1 / -1;
}

.detail-card {
  padding: 26px;
}

.detail-card h3 {
  margin: 14px 0 10px;
  font-size: 30px;
  line-height: 1.25;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 18px 0;
}

.detail-grid > div,
.skill-block,
.download-box {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfbf8;
}

.skill-block {
  margin-bottom: 18px;
}

.skill-block h4,
.detail-grid h4,
.download-box h4 {
  margin-bottom: 8px;
}

.download-box {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 14px;
  align-items: center;
}

.material-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.material-grid a,
.locked {
  display: grid;
  place-items: center;
  min-height: 48px;
  padding: 12px;
  background: var(--green);
  color: #fff;
  font-weight: 800;
  text-align: center;
}

.locked {
  grid-column: 1 / -1;
  background: #e9eee9;
  color: var(--muted);
}

ul,
ol {
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 980px) {
  .topbar,
  .hero-grid,
  .download-box {
    grid-template-columns: 1fr;
  }

  nav {
    justify-content: flex-start;
  }

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

  .tool-results,
  .detail-grid,
  .material-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .login {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100vw;
    min-height: 100svh;
    padding: 16px;
    overflow: hidden;
  }

  .login-card {
    flex: 0 1 auto;
    width: min(320px, calc(100vw - 32px));
    min-width: 0;
    max-width: 320px;
    padding: 24px;
    overflow: hidden;
  }

  .topbar {
    padding: 34px 18px;
  }

  main {
    padding: 18px 12px 44px;
  }

  .section {
    padding: 20px;
  }

  .package-grid {
    grid-template-columns: 1fr;
  }

  .search-row {
    grid-template-columns: 1fr;
  }

  .topbar h1,
  .login-card h1 {
    font-size: 32px;
  }

  .login-card p,
  .hint,
  .topbar p,
  .section-head p,
  .summary-card p,
  .package-card p,
  .tool-card p,
  .detail-card p,
  .download-box p {
    overflow-wrap: anywhere;
  }

  .material-grid a {
    min-height: 44px;
    padding: 10px;
  }
}