/* rebuild 1785511549821 */
:root {
  --bg: #f3f7fb;
  --surface: #ffffff;
  --surface-2: #eef4fa;
  --ink: #13202d;
  --muted: #5c6b7a;
  --line: #d8e3ee;
  --line-strong: #c3d3e2;
  --brand: #0b5fa5;
  --brand-deep: #08467a;
  --brand-soft: #e3f0fb;
  --accent: #e8590c;
  --accent-soft: #fdeee2;
  --teal: #0f766e;
  --teal-soft: #e0f4f0;
  --amber: #b45309;
  --amber-soft: #fdf1dc;
  --danger: #c0392b;
  --danger-soft: #fbe9e7;
  --dark: #0b1524;
  --dark-2: #10202f;
  --dark-line: #20354d;
  --code-bg: #0d1b2a;
  --code-line: #1a2c40;
  --tok-keyword: #ff8a5c;
  --tok-type: #7cc4ff;
  --tok-std: #82c8a0;
  --tok-string: #b5e48c;
  --tok-number: #ffd166;
  --tok-comment: #7f8ea3;
  --tok-pre: #d7a9ff;
  --tok-plain: #d6e4f0;
  --radius: 8px;
  --shadow: 0 12px 30px rgba(15, 35, 58, 0.08);
  --shadow-soft: 0 4px 14px rgba(15, 35, 58, 0.06);
  --header-h: 64px;
  --content-w: 1120px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid rgba(11, 95, 165, 0.35);
  outline-offset: 2px;
}

svg {
  width: 1em;
  height: 1em;
  flex: none;
}

.progress-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.25);
  z-index: 60;
}

.progress-top span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.25s ease;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(16px, 4vw, 48px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  min-width: 38px;
  height: 38px;
  padding: 0 8px;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-family: "Cascadia Code", Consolas, monospace;
  font-weight: 800;
  font-size: 15px;
}

.brand-text {
  color: var(--ink);
  font-size: 18px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  transition: color 0.15s ease, background 0.15s ease;
}

.site-nav a:hover {
  color: var(--brand);
  background: var(--brand-soft);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.progress-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.progress-chip svg {
  color: var(--teal);
}

.progress-chip b {
  color: var(--ink);
  min-width: 34px;
  text-align: right;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.icon-btn:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.nav-toggle {
  display: none;
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--dark);
  color: #ffffff;
}

.mobile-menu nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 40px;
}

.mobile-menu nav a {
  padding: 14px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 18px;
  font-weight: 600;
}

.mobile-close {
  align-self: flex-end;
  border-color: rgba(255, 255, 255, 0.25);
  background: transparent;
  color: #ffffff;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  padding: 84px clamp(20px, 5vw, 64px) 72px;
  background: var(--dark);
  color: #ffffff;
}

.code-canvas {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-token {
  position: absolute;
  white-space: nowrap;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 14px;
  line-height: 1;
  opacity: 0;
  animation: tokenFloat linear infinite;
}

.hero-token.tok-c { color: var(--tok-type); }
.hero-token.tok-k { color: var(--tok-keyword); }
.hero-token.tok-s { color: var(--tok-string); }
.hero-token.tok-p { color: var(--tok-pre); }
.hero-token.tok-n { color: var(--tok-number); }
.hero-token.tok-m { color: var(--muted); }

@keyframes tokenFloat {
  0% {
    transform: translateY(20px);
    opacity: 0;
  }
  12% {
    opacity: 0.5;
  }
  85% {
    opacity: 0.4;
  }
  100% {
    transform: translateY(-70vh);
    opacity: 0;
  }
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--content-w);
  margin: 0 auto;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  color: #bcd7ef;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(34px, 5.4vw, 60px);
  line-height: 1.14;
  letter-spacing: 0;
}

.hero h1 span {
  color: #63b3ff;
}

.hero-sub {
  max-width: 620px;
  margin: 20px 0 28px;
  color: #b8c9da;
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 8px 18px rgba(232, 89, 12, 0.25);
}

.btn-primary:hover {
  background: #c94a08;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #ffffff;
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.75);
  background: rgba(255, 255, 255, 0.08);
}

.btn-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.btn-secondary:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.btn-ghost-dark {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--brand-deep);
}

.btn-ghost-dark:hover {
  background: var(--brand-soft);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 720px;
  margin: 48px 0 0;
}

.hero-stats div {
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
}

.hero-stats dt {
  color: #93a7ba;
  font-size: 12px;
  font-weight: 600;
}

.hero-stats dd {
  margin: 4px 0 0;
  color: #ffffff;
  font-size: 24px;
  font-weight: 800;
}

.section {
  padding: 76px clamp(20px, 5vw, 64px);
}

.section-alt {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-dark {
  background: var(--dark);
  color: #ffffff;
}

.section-head {
  max-width: var(--content-w);
  margin: 0 auto 40px;
}

.section-head h2 {
  margin: 6px 0 10px;
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-head p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.section-dark .section-head p:last-child {
  color: #9fb2c4;
}

.kicker {
  display: inline-block;
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.section-dark .kicker {
  color: #ffb37e;
}

.roadmap {
  display: grid;
  gap: 20px;
  max-width: var(--content-w);
  margin: 0 auto 28px;
}

.phase {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.phase::before {
  content: "";
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: -1px;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background: var(--brand);
}

.phase:nth-child(2)::before { background: var(--teal); }
.phase:nth-child(3)::before { background: #7a5cff; }
.phase:nth-child(4)::before { background: var(--accent); }
.phase:nth-child(5)::before { background: #c2185b; }
.phase:nth-child(6)::before { background: #1976d2; }

.phase-head {
  display: grid;
  grid-template-columns: 52px 1fr minmax(120px, 220px);
  gap: 16px;
  align-items: center;
}

.phase-num {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 20px;
  font-weight: 800;
}

.phase-title h3 {
  margin: 0 0 2px;
  font-size: 21px;
  letter-spacing: 0;
}

.phase-title p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.phase-progress {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-2);
}

.phase-progress span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--teal);
  transition: width 0.25s ease;
}

.phase-outcome {
  margin: 16px 0 14px;
  padding: 10px 14px;
  border-left: 3px solid var(--teal);
  background: var(--teal-soft);
  color: #0b4f49;
  font-size: 14px;
  font-weight: 600;
}

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

.lesson-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border-radius: 6px;
  transition: background 0.15s ease;
}

.lesson-list li:hover {
  background: var(--surface-2);
}

.lesson-list li.done span {
  color: var(--muted);
  text-decoration: line-through;
}

.lesson-check {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  padding: 0;
  border: 2px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  color: transparent;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.lesson-check svg {
  width: 16px;
  height: 16px;
}

.lesson-check[aria-pressed="true"] {
  border-color: var(--teal);
  background: var(--teal);
  color: #ffffff;
}

.progress-summary {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: 20px;
  align-items: center;
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.progress-summary-text {
  display: flex;
  flex-direction: column;
}

.progress-summary-text span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.progress-summary-text b {
  font-size: 17px;
}

.progress-bar {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-2);
}

.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--accent);
  transition: width 0.25s ease;
}

.example-tabs,
.challenge-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--content-w);
  margin: 0 auto 18px;
}

.example-tabs button,
.challenge-tabs button {
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.example-tabs button:hover,
.challenge-tabs button:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.example-tabs button.active,
.challenge-tabs button.active {
  border-color: var(--brand);
  background: var(--brand);
  color: #ffffff;
}

.example-shell,
.challenge-shell {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.example-meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.example-meta h3 {
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: 0;
}

.example-meta p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
}

.code-window,
.output-window {
  overflow: hidden;
  border: 1px solid var(--code-line);
  border-radius: var(--radius);
  background: var(--code-bg);
}

.code-window + .output-window {
  margin-top: 14px;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 14px;
  border-bottom: 1px solid var(--code-line);
  background: var(--dark-2);
  color: #8da2b8;
  font-size: 12px;
  font-weight: 700;
}

.window-bar .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff5f57;
}

.window-bar .dot:nth-child(2) {
  background: #febc2e;
}

.window-bar .dot:nth-child(3) {
  background: #28c840;
}

.file-name {
  margin-left: 8px;
}

.code-body {
  margin: 0;
  padding: 20px;
  overflow: auto;
  color: var(--tok-plain);
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 14px;
  line-height: 1.7;
  tab-size: 4;
}

.code-body code {
  font-family: inherit;
}

.output-label {
  color: #9fd6b2;
}

.output-window pre {
  margin: 0;
  padding: 16px 20px;
  color: #bfe8cc;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.tok-keyword { color: var(--tok-keyword); }
.tok-type { color: var(--tok-type); }
.tok-std { color: var(--tok-std); }
.tok-string { color: var(--tok-string); }
.tok-number { color: var(--tok-number); }
.tok-comment { color: var(--tok-comment); }
.tok-pre { color: var(--tok-pre); }
.tok-func { color: #ffd166; }
.tok-plain { color: var(--tok-plain); }

.blank-inline {
  display: inline-block;
  min-width: 86px;
  padding: 0 10px;
  border-bottom: 2px solid var(--accent);
  color: #ffd9b8;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 800;
  text-align: center;
}

.terminal-layout {
  display: grid;
  grid-template-columns: minmax(220px, 300px) 1fr;
  gap: 24px;
  max-width: var(--content-w);
  margin: 0 auto;
}

.terminal-guide {
  padding: 22px;
  border: 1px solid var(--dark-line);
  border-radius: var(--radius);
  background: var(--dark-2);
}

.terminal-guide h3 {
  margin: 0 0 14px;
  font-size: 16px;
}

.terminal-guide ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.terminal-guide code {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  color: #a9d3ff;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 13px;
}

.terminal {
  overflow: hidden;
  border: 1px solid var(--dark-line);
  border-radius: var(--radius);
  background: #050b14;
}

.terminal-title {
  color: #9fb2c4;
}

.terminal-body {
  height: 360px;
  padding: 18px;
  overflow-y: auto;
  color: #c8d8e8;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.terminal-line {
  margin: 0 0 4px;
}

.terminal-line.cmd {
  color: #ffd9b8;
}

.terminal-line.out {
  color: #9fd6b2;
}

.terminal-line.err {
  color: #ff9c91;
}

.terminal-input {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-top: 1px solid var(--dark-line);
  background: var(--dark-2);
}

.terminal-input .prompt {
  color: #ffb37e;
  font-family: "Cascadia Code", Consolas, monospace;
  font-weight: 800;
}

.terminal-input input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: #ffffff;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 14px;
}

.terminal-input input::placeholder {
  color: #5f7186;
}

.challenge-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--content-w);
  margin: 0 auto 18px;
}

.challenge-tabs {
  margin: 0;
}

.challenge-score {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.challenge-score b {
  color: var(--teal);
}

.challenge-prompt {
  margin-bottom: 16px;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  background: var(--accent-soft);
  color: #7c320b;
  font-size: 15px;
  font-weight: 600;
}

.challenge-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0;
}

.challenge-options button {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.challenge-options button:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.challenge-options button.active {
  border-color: var(--brand);
  background: var(--brand);
  color: #ffffff;
}

.challenge-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 18px;
}

.challenge-result {
  font-size: 14px;
  font-weight: 700;
}

.challenge-result.ok {
  color: var(--teal);
}

.challenge-result.bad {
  color: var(--danger);
}

.quiz-shell {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.quiz-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.quiz-progress,
.quiz-score {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.quiz-progress {
  background: var(--brand-soft);
  color: var(--brand-deep);
}

.quiz-score {
  background: var(--teal-soft);
  color: var(--teal);
}

.quiz-shell h3 {
  min-height: 28px;
  margin: 0 0 18px;
  font-size: 20px;
  line-height: 1.45;
  letter-spacing: 0;
  white-space: pre-line;
}

.quiz-options {
  display: grid;
  gap: 10px;
}

.quiz-options button {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.quiz-options button:hover {
  border-color: var(--brand);
  background: var(--brand-soft);
}

.quiz-options button .opt-key {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  flex: none;
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.quiz-options button.correct {
  border-color: var(--teal);
  background: var(--teal-soft);
}

.quiz-options button.correct .opt-key {
  background: var(--teal);
  color: #ffffff;
}

.quiz-options button.wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.quiz-options button.wrong .opt-key {
  background: var(--danger);
  color: #ffffff;
}

.quiz-options button:disabled {
  cursor: default;
}

.quiz-feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 6px;
  font-size: 14px;
  line-height: 1.6;
}

.quiz-feedback.good {
  background: var(--teal-soft);
  color: #0b4f49;
}

.quiz-feedback.bad {
  background: var(--danger-soft);
  color: #7b241c;
}

.quiz-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.table-wrap {
  max-width: var(--content-w);
  margin: 0 auto;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 15px;
}

th,
td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  background: var(--surface-2);
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover {
  background: var(--surface-2);
}

td:first-child {
  color: var(--brand);
  font-weight: 800;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  max-width: var(--content-w);
  margin: 0 auto;
}

.resource-card {
  display: block;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

a.resource-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: var(--shadow);
}

.resource-icon {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 14px;
  border-radius: 8px;
  background: var(--brand-soft);
  color: var(--brand);
}

.resource-icon svg {
  width: 20px;
  height: 20px;
}

.resource-card:nth-child(2) .resource-icon { background: var(--teal-soft); color: var(--teal); }
.resource-card:nth-child(3) .resource-icon { background: var(--accent-soft); color: var(--accent); }
.resource-card:nth-child(4) .resource-icon { background: var(--amber-soft); color: var(--amber); }
.resource-card:nth-child(5) .resource-icon { background: #efe9ff; color: #6b46c1; }
.resource-card:nth-child(6) .resource-icon { background: #ffe9f0; color: #c2185b; }
.resource-card:nth-child(7) .resource-icon { background: #e3f2fd; color: #1976d2; }
.resource-card:nth-child(8) .resource-icon { background: #e8f5e9; color: #2e7d32; }

.resource-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: 0;
}

.resource-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 34px clamp(20px, 5vw, 64px);
  background: var(--ink);
  color: #aebfd0;
}

.site-footer > div {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #ffffff;
  font-weight: 700;
}

.site-footer p {
  margin: 0;
  font-size: 14px;
}

.site-footer .footer-copy {
  color: #71869b;
}

@media (max-width: 1080px) {
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .site-nav {
    display: none;
  }

  .nav-toggle {
    display: inline-grid;
  }

  .progress-chip {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 64px;
  }

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

  .phase-head {
    grid-template-columns: 48px 1fr;
  }

  .phase-progress {
    grid-column: 1 / -1;
  }

  .progress-summary {
    grid-template-columns: 1fr auto;
  }

  .progress-bar {
    grid-column: 1 / -1;
    grid-row: 2;
  }

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

  .example-meta {
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15px;
  }

  .section {
    padding: 52px 16px;
  }

  .hero {
    padding: 48px 18px 52px;
  }

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

  .hero-sub {
    font-size: 16px;
  }

  .hero-stats {
    margin-top: 32px;
  }

  .phase {
    padding: 18px 16px;
  }

  .phase-head {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .example-shell,
  .challenge-shell,
  .quiz-shell {
    padding: 16px;
  }

  .code-body {
    padding: 14px;
    font-size: 12.5px;
  }

  .challenge-actions {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}