* {
  box-sizing: border-box;
}

:root {
  --bg: #f5f6f8;
  --text: #1d2530;
  --muted: #667085;
  --card: #ffffff;
  --line: #dde3ea;
  --accent: #2457c5;
  --accent-dark: #183e91;
  --code-bg: #111827;
  --code-text: #e5e7eb;
  --success-bg: #e9f7ef;
  --success-text: #145a32;
  --error-bg: #fdecea;
  --error-text: #922b21;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.wrap {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 56px 0 44px;
  background: linear-gradient(135deg, #172033, #254f9f);
  color: #ffffff;
}

.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 13px;
  opacity: 0.8;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(32px, 5vw, 54px);
  line-height: 1.05;
}

.lead {
  max-width: 860px;
  margin: 0;
  font-size: 18px;
  opacity: 0.92;
}

.layout {
  display: grid;
  gap: 22px;
  padding: 28px 0 44px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(31, 45, 61, 0.06);
}

.card h2 {
  margin: 0 0 14px;
  font-size: 26px;
  line-height: 1.25;
}

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

.card p {
  margin-top: 0;
}

.card p:last-child {
  margin-bottom: 0;
}

.method-list {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.method-list h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.method-item {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fbfcfe;
}

.method-item h4 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.35;
}

.method-item p {
  margin-bottom: 12px;
}

.method-item p:last-child {
  margin-bottom: 0;
}

.contract-header {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.contract-header p {
  margin: 0;
  color: var(--muted);
}

button {
  border: 0;
  border-radius: 12px;
  padding: 11px 16px;
  font-size: 15px;
  cursor: pointer;
}

#copyContract {
  background: #edf2ff;
  color: var(--accent-dark);
  white-space: nowrap;
}

.primary {
  background: var(--accent);
  color: #ffffff;
  margin-top: 8px;
}

.primary:hover,
#copyContract:hover {
  filter: brightness(0.96);
}

.contract {
  overflow-x: auto;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 20px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.5;
}

.contract code {
  font-family: Consolas, Monaco, "Courier New", monospace;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.note-grid article {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: #fbfcfe;
}

.note-grid p {
  color: var(--muted);
}

.muted {
  color: var(--muted);
}

.question {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

.question:first-of-type {
  border-top: 0;
}

.question p {
  margin: 0 0 10px;
}

label {
  display: block;
  padding: 8px 10px;
  margin: 6px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfcfe;
}

label:hover {
  background: #f3f6fb;
}

input {
  margin-right: 8px;
}

.explain {
  display: none;
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #f4f6f8;
  color: #374151;
}

.question.correct {
  background: linear-gradient(90deg, rgba(46, 204, 113, 0.09), transparent);
}

.question.incorrect {
  background: linear-gradient(90deg, rgba(231, 76, 60, 0.10), transparent);
}

.question.checked .explain {
  display: block;
}

.result {
  margin-top: 16px;
  padding: 16px;
  border-radius: 14px;
  display: none;
}

.result.success {
  display: block;
  background: var(--success-bg);
  color: var(--success-text);
}

.result.error {
  display: block;
  background: var(--error-bg);
  color: var(--error-text);
}

.footer {
  padding: 24px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #ffffff;
}

code {
  font-family: Consolas, Monaco, "Courier New", monospace;
}

@media (max-width: 900px) {
  .note-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  .hero {
    padding: 38px 0 34px;
  }

  .card {
    padding: 18px;
    border-radius: 14px;
  }

  .contract-header {
    display: block;
  }

  #copyContract {
    margin-top: 12px;
    width: 100%;
  }

  .contract {
    font-size: 13px;
    padding: 14px;
  }

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

/* Mobile and overflow fixes */

html {
  width: 100%;
  overflow-x: hidden;
}

body {
  width: 100%;
  min-width: 0;
  overflow-x: hidden;
}

main,
section,
article,
div,
form {
  min-width: 0;
}

.wrap {
  width: min(1160px, calc(100% - 32px));
  max-width: 100%;
  margin: 0 auto;
}

.card,
.method-item,
.note-grid article,
.question,
.result {
  max-width: 100%;
  min-width: 0;
}

.contract-card {
  overflow: hidden;
}

.contract {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  white-space: pre;
  overscroll-behavior-inline: contain;
}

.contract code {
  display: block;
  width: max-content;
  min-width: 100%;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

code {
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.contract code {
  overflow-wrap: normal;
  word-break: normal;
}

img,
svg,
video,
canvas {
  max-width: 100%;
  height: auto;
}

button,
input,
label {
  max-width: 100%;
}

label {
  overflow-wrap: anywhere;
}

.method-item h4,
.question p,
.card h2,
.card h3,
.lead {
  overflow-wrap: anywhere;
}

@media (max-width: 900px) {
  .note-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .wrap {
    width: min(100% - 20px, 1160px);
  }

  .hero {
    padding: 32px 0 28px;
  }

  .eyebrow {
    font-size: 11px;
    line-height: 1.35;
  }

  h1 {
    font-size: clamp(28px, 9vw, 38px);
    line-height: 1.08;
  }

  .lead {
    font-size: 16px;
    line-height: 1.5;
  }

  .layout {
    gap: 16px;
    padding: 18px 0 32px;
  }

  .card {
    padding: 16px;
    border-radius: 14px;
  }

  .card h2 {
    font-size: 22px;
  }

  .card h3,
  .method-list h3 {
    font-size: 19px;
  }

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

  .method-list {
    margin-top: 20px;
    padding-top: 18px;
  }

  .method-item {
    margin-top: 14px;
    padding: 14px;
    border-radius: 12px;
  }

  .method-item h4 {
    font-size: 16px;
  }

  .method-item p {
    font-size: 15px;
  }

  .contract-header {
    display: block;
  }

  .contract-header p {
    font-size: 15px;
  }

  #copyContract {
    width: 100%;
    margin-top: 12px;
  }

  .contract {
    padding: 12px;
    border-radius: 12px;
    font-size: 12px;
    line-height: 1.45;
  }

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

  .note-grid article {
    padding: 14px;
  }

  .question {
    padding: 16px 0;
  }

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

  label {
    padding: 10px;
    font-size: 15px;
    line-height: 1.4;
  }

  .explain {
    font-size: 14px;
  }

  .primary {
    width: 100%;
  }

  .footer {
    padding: 18px 0;
    font-size: 14px;
    text-align: center;
  }
}

@media (max-width: 420px) {
  .wrap {
    width: min(100% - 16px, 1160px);
  }

  .card {
    padding: 14px;
  }

  .hero {
    padding: 28px 0 24px;
  }

  h1 {
    font-size: 27px;
  }

  .lead {
    font-size: 15px;
  }

  .contract {
    font-size: 11.5px;
    padding: 10px;
  }

  .method-item {
    padding: 12px;
  }

  button {
    padding: 11px 14px;
  }
}

/* Proto syntax highlighting */

.contract .proto-keyword {
  color: #93c5fd;
  font-weight: 600;
}

.contract .proto-type {
  color: #86efac;
}

.contract .proto-string {
  color: #fbbf24;
}

.contract .proto-number {
  color: #fca5a5;
}

.contract .proto-comment {
  color: #9ca3af;
  font-style: italic;
}

.contract .proto-service {
  color: #c4b5fd;
  font-weight: 600;
}

.contract .proto-method {
  color: #f0abfc;
}

.contract .proto-field {
  color: #e5e7eb;
}

.contract .proto-import {
  color: #fdba74;
}

.link {
	color: #FFFFFF;
}