/* Reset & Variables */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0f1117;
  --surface: #181b24;
  --surface-raised: #1e222d;
  --border: #2a2f3c;
  --text: #e4e6ed;
  --text-muted: #8b90a0;
  --accent: #00bcd4;
  --accent-soft: rgba(0, 188, 212, 0.12);
  --green: #00c9a7;
  --green-soft: rgba(0, 201, 167, 0.1);
  --yellow: #fec514;
  --yellow-soft: rgba(254, 197, 20, 0.1);
  --pink: #f04e98;
  --pink-soft: rgba(240, 78, 152, 0.1);
  --purple: #b48eff;
  --purple-soft: rgba(180, 142, 255, 0.1);
  --orange: #ff8a50;
  --orange-soft: rgba(255, 138, 80, 0.1);
}

/* Base */
body {
  font-family: "DM Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  padding: 40px 20px;
}

body.page-index {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  line-height: normal;
}

.container {
  max-width: 820px;
  margin: 0 auto;
}

body.page-index .container {
  max-width: 560px;
  width: 100%;
  text-align: center;
}

/* Header badge */
.header-badge {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 20px;
}

/* ==================
   INDEX PAGE
   ================== */

body.page-index h1 {
  font-family: "DM Serif Display", serif;
  font-size: 36px;
  font-weight: 400;
  margin-bottom: 10px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 48px;
}

.buttons {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.btn {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  text-decoration: none;
  color: var(--text);
  transition:
    border-color 0.2s,
    background 0.2s,
    transform 0.15s;
  text-align: left;
}

.btn:hover {
  transform: translateY(-2px);
  background: var(--surface-raised);
}

.btn-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.btn-text .label {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 3px;
}

.btn-text .title {
  font-weight: 600;
  font-size: 15px;
}

.btn-arrow {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 18px;
  flex-shrink: 0;
}

.btn-bash {
  border-color: rgba(0, 201, 167, 0.25);
}
.btn-bash:hover {
  border-color: var(--green);
}
.btn-bash .btn-icon {
  background: var(--green-soft);
}
.btn-bash .label {
  color: var(--green);
}

.btn-elastic {
  border-color: rgba(254, 197, 20, 0.25);
}
.btn-elastic:hover {
  border-color: var(--yellow);
}
.btn-elastic .btn-icon {
  background: var(--yellow-soft);
}
.btn-elastic .label {
  color: var(--yellow);
}

.btn-playwright {
  border-color: rgba(0, 188, 212, 0.25);
}
.btn-playwright:hover {
  border-color: var(--accent);
}
.btn-playwright .btn-icon {
  background: var(--accent-soft);
}
.btn-playwright .label {
  color: var(--accent);
}

.btn-jest {
  border-color: rgba(240, 78, 152, 0.25);
}
.btn-jest:hover {
  border-color: var(--pink);
}
.btn-jest .btn-icon {
  background: var(--pink-soft);
}
.btn-jest .label {
  color: var(--pink);
}

.btn-sdd {
  border-color: rgba(255, 138, 80, 0.25);
}
.btn-sdd:hover {
  border-color: var(--orange);
}
.btn-sdd .btn-icon {
  background: var(--orange-soft);
}
.btn-sdd .label {
  color: var(--orange);
}

.btn-junit {
  border-color: rgba(0, 201, 167, 0.25);
}
.btn-junit:hover {
  border-color: var(--green);
}
.btn-junit .btn-icon {
  background: var(--green-soft);
}
.btn-junit .label {
  color: var(--green);
}

/* ==================
   CONTENT PAGES
   ================== */

/* Header */
.header {
  text-align: center;
  margin-bottom: 56px;
  padding: 48px 32px;
  background: linear-gradient(
    135deg,
    var(--surface) 0%,
    var(--surface-raised) 100%
  );
  border: 1px solid var(--border);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  pointer-events: none;
}

.header .header-badge {
  position: relative;
}

.header h1 {
  font-family: "DM Serif Display", serif;
  font-size: 38px;
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 12px;
  position: relative;
}

.header p {
  color: var(--text-muted);
  font-size: 15px;
  position: relative;
}

/* Sections */
.section {
  margin-bottom: 40px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.section-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.section-header h2 {
  font-family: "DM Serif Display", serif;
  font-size: 22px;
  font-weight: 400;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  margin-bottom: 12px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: #3a3f50;
}

.card-title {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card p,
.card li {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.card ul {
  list-style: none;
  padding: 0;
}

.card ul li {
  padding: 4px 0 4px 20px;
  position: relative;
}

.card ul li::before {
  content: "\2192";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 13px;
}

/* Concept grid */
.concept-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.concept-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
}

.concept-card .label {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.concept-card .value {
  color: var(--text-muted);
  font-size: 13px;
}

/* Color utilities */
.green-color {
  color: var(--green);
}
.yellow-color {
  color: var(--yellow);
}
.pink-color {
  color: var(--pink);
}
.purple-color {
  color: var(--purple);
}
.orange-color {
  color: var(--orange);
}
.accent-color {
  color: var(--accent);
}

.green-bg {
  background: var(--green-soft);
}
.yellow-bg {
  background: var(--yellow-soft);
}
.pink-bg {
  background: var(--pink-soft);
}
.purple-bg {
  background: var(--purple-soft);
}
.orange-bg {
  background: var(--orange-soft);
}
.accent-bg {
  background: var(--accent-soft);
}

/* Code blocks */
.code-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  font-family: "JetBrains Mono", monospace;
  font-size: 12.5px;
  line-height: 1.8;
  overflow-x: auto;
  margin: 12px 0;
  color: var(--text-muted);
}

.code-block .cmd {
  color: var(--accent);
}
.code-block .flag {
  color: var(--yellow);
}
.code-block .val {
  color: var(--green);
}
.code-block .str {
  color: var(--purple);
}
.code-block .var {
  color: var(--orange);
}
.code-block .url {
  color: var(--green);
}
.code-block .json {
  color: var(--pink);
}
.code-block .comment {
  color: #555a6e;
  font-style: italic;
}

/* Inline code */
code {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 1px 6px;
  border-radius: 4px;
}

/* Analogy box */
.analogy-box {
  background: var(--surface-raised);
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  padding: 18px 22px;
  margin: 16px 0;
}

.analogy-box .analogy-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.analogy-box p {
  color: var(--text-muted);
  font-size: 14px;
}

/* Flow diagrams */
.analogy-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 0;
  flex-wrap: wrap;
}

.flow-box {
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--surface);
}

.arrow {
  color: var(--text-muted);
  font-size: 18px;
}

/* Tag */
.tag {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 6px;
  margin-right: 4px;
  margin-bottom: 4px;
}

/* Divider */
.divider {
  height: 1px;
  background: var(--border);
  margin: 40px 0;
}

/* Reference table */
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 12px 0;
}

.ref-table th {
  background: var(--surface-raised);
  color: var(--text-muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.ref-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  vertical-align: top;
}

.ref-table tr:last-child td {
  border-bottom: none;
}

.ref-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.ref-table td:first-child {
  font-family: "JetBrains Mono", monospace;
  color: var(--accent);
  font-size: 12px;
  white-space: nowrap;
}

/* Waterfall (APM traces) */
.waterfall {
  padding: 12px 0;
}

.waterfall-row {
  display: flex;
  align-items: center;
  margin-bottom: 6px;
  font-size: 13px;
}

.waterfall-label {
  width: 160px;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
  text-align: right;
  padding-right: 14px;
}

.waterfall-bar {
  height: 22px;
  border-radius: 4px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: rgba(255, 255, 255, 0.7);
}

/* Key takeaway */
.takeaway {
  border-radius: 16px;
  padding: 28px;
  text-align: center;
  margin-top: 40px;
}

.takeaway h3 {
  font-family: "DM Serif Display", serif;
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 12px;
}

.takeaway p {
  color: var(--text-muted);
  font-size: 14px;
  max-width: 600px;
  margin: 0 auto;
}

/* ==================
   RESPONSIVE
   ================== */

@media (max-width: 600px) {
  .concept-grid {
    grid-template-columns: 1fr;
  }
  .header h1 {
    font-size: 28px;
  }
  .analogy-flow {
    flex-direction: column;
  }
  .analogy-flow .arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 480px) {
  body.page-index h1 {
    font-size: 28px;
  }
}