/* utsuroi sqli labs — modern editorial aesthetic
   Designed as a contemporary print magazine: confident typography,
   generous negative space, sharp hairlines, decisive accent. */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400;1,9..144,500;1,9..144,600&family=Manrope:wght@300;400;500;600;700&family=Shippori+Mincho:wght@400;500;600&family=Noto+Sans+JP:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Surface */
  --bg: #F4F0E7;
  --bg-elev: #FBF8F1;
  --bg-soft: #EAE3D3;
  --bg-deep: #1B1714;

  /* Text */
  --text: #14110D;
  --text-soft: #44403A;
  --text-faint: #8C8779;
  --text-on-dark: #F4F0E7;

  /* Lines & accent */
  --line: rgba(20, 17, 13, 0.10);
  --line-strong: rgba(20, 17, 13, 0.34);
  --line-black: #14110D;

  --accent: #C9405E;
  --accent-deep: #8E1F3E;
  --accent-soft: #F6E1E8;

  --ok: #4D6B1F;
  --ok-soft: #E5EDD2;
  --warn: #8A4B0B;
  --warn-soft: #F4E4C8;
  --danger: #9A2A20;
  --danger-soft: #F2D9D5;
  --info: #1E4F7A;
  --info-soft: #DCE6EF;

  /* Type */
  --font-display: 'Fraunces', 'Shippori Mincho', serif;
  --font-display-jp: 'Shippori Mincho', 'Fraunces', serif;
  --font-body: 'Manrope', 'Noto Sans JP', -apple-system, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;

  --radius: 2px;
  --radius-md: 4px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-feature-settings: 'ss01', 'cv11';
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 14.5px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  letter-spacing: -0.005em;
}

/* fine grain — paper feel */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 18% 22%, rgba(201, 64, 94, 0.025) 0%, transparent 38%),
    radial-gradient(circle at 82% 76%, rgba(30, 79, 122, 0.018) 0%, transparent 42%);
  pointer-events: none;
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

a { color: var(--accent); text-decoration: none; transition: color 0.18s; }
a:hover { color: var(--accent-deep); }

::selection { background: var(--accent); color: var(--bg); }

button {
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--text);
  padding: 7px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s ease;
  font-feature-settings: 'ss01';
}
button:hover { background: var(--line-black); color: var(--bg); border-color: var(--line-black); }
button:active { transform: translateY(1px); }
button.primary {
  background: var(--line-black);
  color: var(--bg);
  border-color: var(--line-black);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 11px;
  padding: 8px 16px;
}
button.primary:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); }
button:disabled { opacity: 0.4; cursor: not-allowed; }

input, textarea {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
}
input:focus, textarea:focus {
  border-color: var(--line-black);
  box-shadow: 0 0 0 3px rgba(20, 17, 13, 0.06);
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-soft);
  padding: 1px 5px;
  border-radius: var(--radius);
  color: var(--text);
}

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

.site-header {
  padding: 6rem 2rem 4rem;
  text-align: center;
  position: relative;
}
.site-header::after {
  content: '';
  display: block;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 1px;
  background: var(--line-black);
}

.brand {
  font-family: var(--font-display);
  font-size: clamp(72px, 11vw, 144px);
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.04em;
  line-height: 0.92;
  color: var(--text);
  font-variation-settings: 'opsz' 144;
}
.brand em {
  font-style: italic;
}
.brand-jp {
  font-family: var(--font-display-jp);
  font-size: 14px;
  letter-spacing: 1.2em;
  margin-top: 1.5rem;
  margin-left: 1.2em;
  color: var(--accent);
  font-weight: 400;
}
.tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(15px, 2vw, 19px);
  color: var(--text-soft);
  margin-top: 2rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.subtitle {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  margin-top: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.intro {
  max-width: 600px;
  margin: 5rem auto 4rem;
  padding: 0 2rem;
  text-align: center;
}
.intro p {
  font-size: 16px;
  color: var(--text);
  line-height: 1.85;
  font-weight: 300;
}
.intro .meta {
  margin-top: 2.5rem;
  display: flex;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.intro .meta span {
  padding: 0 1.4rem;
  border-right: 1px solid var(--line-strong);
}
.intro .meta span:last-child { border-right: none; }
.intro .meta span::before { content: ''; }

.intro .disclaimer {
  margin-top: 2rem;
  padding: 14px 20px;
  border-left: 2px solid var(--accent);
  background: var(--bg-elev);
  border-radius: var(--radius);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 720px;
}
.intro .disclaimer strong {
  color: var(--text);
  font-weight: 500;
}

.lab-list {
  max-width: 1080px;
  margin: 4rem auto 6rem;
  padding: 0 2rem;
}
.phase-section {
  margin-bottom: 4.5rem;
  border-top: 1px solid var(--line-black);
  padding-top: 1.5rem;
}
.phase-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 0.4rem;
  font-variation-settings: 'opsz' 80;
}
.phase-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  letter-spacing: 0.18em;
  margin-bottom: 1.8rem;
  text-transform: uppercase;
}

.lab-card {
  display: grid;
  grid-template-columns: 70px 1fr auto;
  align-items: baseline;
  gap: 1.6rem;
  padding: 1.6rem 0.8rem 1.6rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--text);
  transition: padding 0.25s ease, background 0.25s ease;
  position: relative;
}
.lab-card:hover {
  padding-left: 1.2rem;
  background: rgba(20, 17, 13, 0.02);
}
.lab-card:hover .lab-arrow {
  transform: translateX(8px);
  color: var(--accent);
  opacity: 1;
}
.lab-card:hover .lab-num {
  color: var(--accent);
}
.lab-num {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  line-height: 0.95;
  font-variation-settings: 'opsz' 80;
  transition: color 0.25s;
}
.lab-info { padding-top: 4px; }
.lab-info .title {
  font-size: 16.5px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}
.lab-info .desc {
  font-size: 13px;
  color: var(--text-soft);
  line-height: 1.55;
  font-weight: 300;
  max-width: 540px;
}
.lab-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  align-self: center;
}
.lab-level {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  padding: 4px 8px;
  border-radius: var(--radius);
  text-transform: uppercase;
  font-weight: 500;
  border: 1px solid;
}
.lab-level.apprentice { color: var(--info); border-color: var(--info); background: transparent; }
.lab-level.practitioner { color: var(--warn); border-color: var(--warn); background: transparent; }
.lab-arrow {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--text-faint);
  font-size: 22px;
  font-weight: 400;
  transition: all 0.25s ease;
  opacity: 0.4;
  line-height: 1;
}

/* Category cards (top page) */
.lab-card.category-card .lab-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-style: normal;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  line-height: 1.4;
  padding-top: 6px;
  font-variation-settings: 'opsz' 14;
}
.lab-card.category-card .lab-info .title { font-size: 18px; }
.lab-card.category-card.disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}
.lab-card.category-card.disabled:hover {
  background: transparent;
  border-color: var(--line);
  transform: none;
}
.lab-status {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  padding: 4px 10px;
  border-radius: var(--radius);
  text-transform: uppercase;
  color: var(--text-faint);
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
}

.future-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 0;
}
.future-list span {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-faint);
  letter-spacing: -0.005em;
  background: var(--bg-elev);
}

.back-to-root {
  position: absolute;
  top: 1.6rem;
  left: 2rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}
.back-to-root a {
  color: var(--text-faint);
  transition: color 0.2s;
}
.back-to-root a:hover { color: var(--accent); }
.site-header { position: relative; }

.site-footer {
  border-top: 1px solid var(--line-black);
  padding: 3rem 2rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.8;
}
.site-footer .ja {
  font-family: var(--font-display);
  font-style: italic;
  text-transform: none;
  letter-spacing: -0.01em;
  font-size: 15px;
  color: var(--accent);
  font-weight: 400;
}
.site-footer p:last-child { margin-top: 0.6rem; }

/* ============ LAB PAGE ============ */

.lab-header {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--line-black);
  margin-bottom: 3rem;
  position: relative;
}
.lab-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
}
.lab-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 2.5rem;
}
.lab-nav a { color: var(--text-faint); transition: color 0.18s; }
.lab-nav a:hover { color: var(--text); }
.lab-nav .home {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 18px;
  text-transform: none;
  letter-spacing: -0.02em;
  color: var(--text);
  font-weight: 500;
  font-variation-settings: 'opsz' 60;
}
.lab-nav .home:hover { color: var(--accent); }
.lab-num-big {
  font-family: var(--font-display);
  font-size: clamp(64px, 9vw, 108px);
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  line-height: 0.92;
  margin-bottom: 0.6rem;
  letter-spacing: -0.04em;
  font-variation-settings: 'opsz' 144;
}
.lab-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.6rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-variation-settings: 'opsz' 60;
}
.lab-en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 16px;
  color: var(--text-soft);
  margin-bottom: 1rem;
  font-weight: 400;
  font-variation-settings: 'opsz' 36;
}
.lab-tags { display: flex; gap: 8px; flex-wrap: wrap; }

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

.section { margin-bottom: 2rem; }
.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

.mission {
  padding: 18px 22px;
  background: var(--info-soft);
  color: var(--info);
  border-radius: var(--radius);
  border-left: 2px solid var(--info);
  font-size: 13.5px;
  line-height: 1.65;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-weight: 400;
}
.mission > i {
  font-style: normal;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
  flex-shrink: 0;
  color: var(--info);
}
.mission code {
  background: rgba(30, 79, 122, 0.12);
  color: var(--info);
}

.success-banner {
  padding: 16px 22px;
  background: var(--ok);
  color: var(--bg);
  border-radius: var(--radius);
  font-size: 13.5px;
  display: none;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border-left: 4px solid var(--text);
  box-shadow: 0 4px 16px rgba(77, 107, 31, 0.18);
  animation: successSlide 0.4s ease-out;
}
.success-banner.on { display: flex; }
.success-banner > span:first-child {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg);
  color: var(--ok);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}
@keyframes successSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* URL bar */
.urlbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  background: var(--bg-deep);
  color: var(--text-on-dark);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: -0.005em;
}
.urlbar .lock { color: rgba(244, 240, 231, 0.4); font-size: 11px; }
.urlbar .pre { color: rgba(244, 240, 231, 0.65); white-space: nowrap; font-size: 11.5px; }
.urlbar input {
  flex: 1;
  padding: 5px 8px;
  font-size: 12px;
  min-width: 0;
  background: rgba(244, 240, 231, 0.06);
  border: 1px solid rgba(244, 240, 231, 0.12);
  color: var(--text-on-dark);
}
.urlbar input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(201, 64, 94, 0.15);
}
.urlbar button.primary {
  background: var(--accent);
  border-color: var(--accent);
  font-size: 10px;
}
.urlbar button.primary:hover { background: var(--bg); color: var(--text); border-color: var(--bg); }

/* Login form */
.loginform {
  background: var(--bg-elev);
  padding: 22px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.loginform .row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}
.loginform label {
  width: 120px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  flex-shrink: 0;
}
.loginform input { flex: 1; }

/* Quick action buttons */
.quick {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  margin-top: 0.8rem;
}
.quick button {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 5px 10px;
  letter-spacing: -0.005em;
}

/* SQL display */
.sql {
  background: var(--bg-deep);
  color: var(--text-on-dark);
  padding: 16px 20px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-all;
  border-left: 3px solid var(--accent);
  position: relative;
}
.sql::before {
  content: 'SQL';
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: rgba(244, 240, 231, 0.3);
  font-weight: 500;
}
.sql .kw { color: #FF89A1; font-weight: 500; }
.sql .str { color: #B7E2FF; }
.sql .num { color: #F4C57A; }
.sql .cmt { color: rgba(244, 240, 231, 0.32); text-decoration: line-through; font-style: italic; }

/* Result grid (products) */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}
.product {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: transform 0.18s, border-color 0.18s;
}
.product:hover { border-color: var(--line-strong); }
.product.draft {
  background: linear-gradient(135deg, var(--warn-soft) 0%, var(--bg-elev) 100%);
  border-color: var(--warn);
  border-style: dashed;
}
.product .nm {
  font-weight: 500;
  font-size: 14.5px;
  line-height: 1.35;
  margin-bottom: 5px;
  letter-spacing: -0.01em;
}
.product .mt {
  font-size: 11.5px;
  color: var(--text-soft);
  margin-bottom: 8px;
  font-family: var(--font-mono);
  letter-spacing: -0.005em;
}
.product .badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  padding: 2px 8px;
  border-radius: var(--radius);
  text-transform: uppercase;
  font-weight: 500;
}
.badge.public { background: var(--ok-soft); color: var(--ok); }
.badge.draft { background: var(--warn); color: var(--bg); }

/* Result table */
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.results-table th {
  background: var(--bg-soft);
  padding: 10px 14px;
  text-align: left;
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line-strong);
}
.results-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  word-break: break-all;
  letter-spacing: -0.005em;
}
.results-table tr:last-child td { border-bottom: none; }
.results-table .leaked {
  background: var(--accent-soft);
  position: relative;
}
.results-table .leaked td {
  color: var(--accent-deep);
  font-weight: 500;
}
.results-table .leaked td:first-child::before {
  content: '◆ ';
  color: var(--accent);
}

/* Result fail / generic */
.result-box {
  padding: 16px 20px;
  border-radius: var(--radius);
  font-size: 13.5px;
  background: var(--bg-soft);
  color: var(--text-soft);
  font-weight: 400;
}
.result-box.fail {
  background: var(--danger-soft);
  color: var(--danger);
  border-left: 2px solid var(--danger);
}
.result-box.ok-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
}
.result-box .urow { display: flex; align-items: center; gap: 16px; }
.result-box .av {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 22px;
  flex-shrink: 0;
  font-variation-settings: 'opsz' 60;
}
.result-box .ui .nm {
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.result-box .ui .ml {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-soft);
  margin-top: 2px;
  letter-spacing: -0.005em;
}
.result-box .dash {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--text-soft);
  line-height: 1.7;
}
.result-box .dash .warn { color: var(--accent); font-weight: 500; }

.role-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  padding: 2px 8px;
  border-radius: var(--radius);
  margin-left: 8px;
  font-weight: 500;
  text-transform: uppercase;
  border: 1px solid;
}
.role-admin { color: var(--danger); border-color: var(--danger); background: transparent; }
.role-vip { color: var(--warn); border-color: var(--warn); background: transparent; }
.role-staff { color: var(--info); border-color: var(--info); background: transparent; }
.role-general { color: var(--text-faint); border-color: var(--line-strong); background: transparent; }

/* Tracking simulation */
.track-display {
  padding: 18px 22px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.track-display .greeting {
  font-size: 14.5px;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.track-display .greeting.welcome {
  color: var(--ok);
  font-weight: 500;
}
.track-display .greeting.unknown {
  color: var(--text-soft);
  font-style: italic;
  font-family: var(--font-display);
  font-weight: 400;
}
.track-display .greeting.error { color: var(--danger); font-weight: 500; }
.track-display .resp-time {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* Time delay bar */
.delaybar {
  height: 2px;
  background: var(--line);
  margin-top: 12px;
  overflow: hidden;
  border-radius: 1px;
}
.delaybar-inner {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width linear;
}

/* Hints */
.hints details {
  background: var(--bg-elev);
  padding: 14px 18px;
  border-radius: var(--radius);
  margin-bottom: 6px;
  font-size: 13.5px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: border-left-color 0.18s;
}
.hints details[open] { border-left-color: var(--accent); }
.hints summary {
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  letter-spacing: -0.01em;
}
.hints summary::-webkit-details-marker { display: none; }
.hints summary::before {
  content: '+';
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-size: 11px;
  flex-shrink: 0;
  color: var(--text-soft);
  font-weight: 400;
  transition: all 0.18s;
}
.hints details[open] summary::before {
  content: '−';
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.hints .body {
  margin-top: 12px;
  margin-left: 26px;
  line-height: 1.75;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 400;
}
.hints .body code {
  background: var(--bg-soft);
  color: var(--text);
}

/* DNS log box (OAST) */
.dnslog {
  background: var(--bg-deep);
  color: rgba(244, 240, 231, 0.85);
  padding: 16px 20px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.85;
  min-height: 100px;
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid rgba(244, 240, 231, 0.06);
}
.dnslog .ts { color: rgba(244, 240, 231, 0.32); }
.dnslog .leak { color: var(--accent); font-weight: 500; }
.dnslog .empty {
  color: rgba(244, 240, 231, 0.32);
  font-style: italic;
  font-family: var(--font-display);
  font-size: 13px;
}

/* XML editor */
.xml-editor {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  width: 100%;
  min-height: 140px;
  resize: vertical;
  line-height: 1.65;
  letter-spacing: -0.005em;
}
.waf-warn {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--danger);
  color: var(--bg);
  font-size: 12px;
  border-radius: var(--radius);
  display: none;
  font-weight: 500;
  letter-spacing: -0.005em;
}
.waf-warn.on { display: block; }

/* Navigation between labs */
.lab-bottom-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line-black);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: -0.005em;
  gap: 1rem;
}
.lab-bottom-nav a {
  color: var(--text-soft);
  transition: color 0.18s;
  flex: 1;
}
.lab-bottom-nav a.next { text-align: right; }
.lab-bottom-nav a:hover { color: var(--accent); }
.lab-bottom-nav .prev::before {
  content: '←  ';
  font-family: var(--font-display);
  font-style: italic;
}
.lab-bottom-nav .next::after {
  content: '  →';
  font-family: var(--font-display);
  font-style: italic;
}

/* Load animation — staggered fade-in */
.lab-card { animation: fadeUp 0.5s ease-out backwards; }
.lab-card:nth-child(1) { animation-delay: 0.04s; }
.lab-card:nth-child(2) { animation-delay: 0.08s; }
.lab-card:nth-child(3) { animation-delay: 0.12s; }
.lab-card:nth-child(4) { animation-delay: 0.16s; }
.lab-card:nth-child(5) { animation-delay: 0.20s; }
.lab-card:nth-child(6) { animation-delay: 0.24s; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.brand, .brand-jp, .tagline, .subtitle { animation: fadeUp 0.6s ease-out backwards; }
.brand-jp { animation-delay: 0.1s; }
.tagline { animation-delay: 0.2s; }
.subtitle { animation-delay: 0.3s; }

/* ============ KNOWLEDGE BASE PAGES ============ */

.kb-header {
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--line-black);
  margin-bottom: 3rem;
  position: relative;
}
.kb-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
}
.kb-eyebrow {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}
.kb-num-big {
  font-family: var(--font-display);
  font-size: clamp(56px, 8vw, 96px);
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  line-height: 0.92;
  margin-bottom: 0.8rem;
  letter-spacing: -0.04em;
  font-variation-settings: 'opsz' 144;
}
.kb-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.6rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-variation-settings: 'opsz' 60;
}
.kb-en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 16px;
  color: var(--text-soft);
  font-weight: 400;
  font-variation-settings: 'opsz' 36;
  margin-bottom: 1.2rem;
}
.kb-lead {
  font-size: 16px;
  color: var(--text-soft);
  line-height: 1.85;
  font-weight: 300;
  max-width: 660px;
}

.kb-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

.kb-toc {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  padding: 18px 22px;
  margin-bottom: 3rem;
  border-radius: var(--radius);
}
.kb-toc-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 12px;
}
.kb-toc ol {
  list-style: none;
  counter-reset: toc;
}
.kb-toc li {
  counter-increment: toc;
  padding: 5px 0;
  font-size: 13.5px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.kb-toc li::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  font-weight: 500;
  min-width: 22px;
}
.kb-toc a {
  color: var(--text);
  font-weight: 400;
}
.kb-toc a:hover { color: var(--accent); }

.kb-section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 1.5rem;
}
.kb-section h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.4rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-variation-settings: 'opsz' 60;
}
.kb-section h2 .anchor {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.14em;
  margin-left: 10px;
  font-style: normal;
  font-weight: 400;
  opacity: 0;
  transition: opacity 0.2s;
}
.kb-section h2:hover .anchor { opacity: 1; }
.kb-section h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  margin-top: 2rem;
  margin-bottom: 0.7rem;
  line-height: 1.3;
  letter-spacing: -0.015em;
  scroll-margin-top: 1.5rem;
  font-variation-settings: 'opsz' 36;
}
.kb-section .deck {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 16px;
  color: var(--text-soft);
  margin-bottom: 1.5rem;
  font-weight: 400;
  font-variation-settings: 'opsz' 36;
}
.kb-section p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 1rem;
  font-weight: 400;
}
.kb-section ul, .kb-section ol {
  margin: 0.8rem 0 1.4rem 1.6rem;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text);
}
.kb-section li { margin-bottom: 6px; }
.kb-section li::marker { color: var(--text-faint); }

.kb-section pre {
  background: var(--bg-deep);
  color: var(--text-on-dark);
  padding: 16px 20px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  margin: 1rem 0 1.5rem;
  overflow-x: auto;
  border-left: 3px solid var(--accent);
}
.kb-section pre.bad {
  border-left-color: var(--danger);
}
.kb-section pre.bad::before {
  content: '✗ 脆弱なコード';
  display: block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: rgba(244, 240, 231, 0.5);
  margin-bottom: 8px;
  text-transform: uppercase;
}
.kb-section pre.good {
  border-left-color: var(--ok);
}
.kb-section pre.good::before {
  content: '✓ 安全なコード';
  display: block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: rgba(244, 240, 231, 0.5);
  margin-bottom: 8px;
  text-transform: uppercase;
}
.kb-section pre .kw { color: #FF89A1; font-weight: 500; }
.kb-section pre .str { color: #B7E2FF; }
.kb-section pre .num { color: #F4C57A; }
.kb-section pre .cmt { color: rgba(244, 240, 231, 0.45); font-style: italic; }

.kb-callout {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-left: 2px solid var(--info);
  padding: 16px 20px;
  margin: 1.4rem 0;
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-soft);
}
.kb-callout.warn { border-left-color: var(--warn); }
.kb-callout.danger { border-left-color: var(--danger); }
.kb-callout.note { border-left-color: var(--info); }
.kb-callout-title {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
  display: block;
}
.kb-callout p { font-size: 13.5px; margin-bottom: 0.6rem; }
.kb-callout p:last-child { margin-bottom: 0; }

.kb-related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.kb-related-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.8rem;
}
.kb-related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
}
.kb-related-list li { margin: 0; }
.kb-related-list a {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 12px;
  color: var(--text);
  font-family: var(--font-mono);
  letter-spacing: -0.005em;
  transition: all 0.18s;
}
.kb-related-list a:hover {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

/* In-lab "prerequisites" and "defense" sections */
.lab-prereqs {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-left: 2px solid var(--info);
  padding: 14px 18px;
  border-radius: var(--radius);
}
.lab-prereqs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
}
.lab-prereqs-list a {
  font-size: 13px;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.lab-prereqs-list a::before {
  content: '→';
  font-family: var(--font-display);
  font-style: italic;
  color: var(--info);
  font-size: 14px;
}
.lab-prereqs-list a:hover { color: var(--info); }
.lab-prereqs-list a:hover::before { transform: translateX(2px); transition: transform 0.18s; }

.lab-defense {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-left: 2px solid var(--ok);
  padding: 18px 22px;
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.7;
}
.lab-defense h4 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.lab-defense h4:not(:first-child) { margin-top: 1.4rem; }
.lab-defense p { margin-bottom: 0.7rem; color: var(--text-soft); }
.lab-defense ul {
  margin: 0.4rem 0 0.7rem 1.5rem;
  font-size: 13px;
  color: var(--text-soft);
}
.lab-defense li { margin-bottom: 4px; }
.lab-defense pre {
  background: var(--bg-deep);
  color: var(--text-on-dark);
  padding: 12px 16px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.65;
  margin: 0.5rem 0 0.7rem;
  overflow-x: auto;
}
.lab-defense pre.bad { border-left: 2px solid var(--danger); }
.lab-defense pre.good { border-left: 2px solid var(--ok); }
.lab-defense .ref-links {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--text-faint);
}
.lab-defense .ref-links a { color: var(--text-soft); }
.lab-defense .ref-links a:hover { color: var(--accent); }

.kb-bottom-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line-black);
  font-family: var(--font-mono);
  font-size: 11.5px;
  gap: 1rem;
}
.kb-bottom-nav a {
  color: var(--text-soft);
  flex: 1;
}
.kb-bottom-nav a.next { text-align: right; }
.kb-bottom-nav a:hover { color: var(--accent); }
.kb-bottom-nav .prev::before { content: '←  '; font-family: var(--font-display); font-style: italic; }
.kb-bottom-nav .next::after { content: '  →'; font-family: var(--font-display); font-style: italic; }

/* Mobile */
@media (max-width: 760px) {
  .site-header { padding: 4rem 1.5rem 3rem; }
  .brand { font-size: 76px; }
  .brand-jp { font-size: 11px; letter-spacing: 0.9em; margin-left: 0.9em; }
  .tagline { font-size: 14px; margin-top: 1.4rem; }
  .intro { padding: 0 1.5rem; margin: 3rem auto; }
  .intro .meta { gap: 0; flex-direction: column; }
  .intro .meta span { padding: 4px 0; border-right: none; border-bottom: 1px solid var(--line); }
  .intro .meta span:last-child { border-bottom: none; }
  .lab-list { padding: 0 1.5rem; }
  .phase-section { margin-bottom: 3rem; }
  .phase-title { font-size: 26px; }
  .lab-card {
    grid-template-columns: 38px 1fr;
    gap: 1rem;
    padding: 1.2rem 0;
  }
  .lab-card .lab-meta { display: none; }
  .lab-num { font-size: 26px; }
  .lab-info .title { font-size: 14.5px; }
  .lab-info .desc { font-size: 12.5px; }
  .lab-num-big { font-size: 64px; }
  .lab-title { font-size: 22px; }
  .container { padding: 0 1.5rem 3rem; }
  .loginform .row {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }
  .loginform label { width: auto; }
  .urlbar { flex-wrap: wrap; }
  .urlbar .pre { font-size: 10.5px; }
}