/* ── Reset & variables ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0d1117;
  --panel:    #161b22;
  --border:   #30363d;
  --text:     #e6edf3;
  --muted:    #7d8590;
  --accent:   #58a6ff;
  --green:    #3fb950;
  --red:      #f85149;
  --orange:   #d29922;
  --yellow:   #e3b341;
  --purple:   #bc8cff;
  --radius:   8px;
  --shadow:   0 4px 24px rgba(0,0,0,.4);
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre { font-family: ui-monospace, "Cascadia Code", "Fira Code", monospace; }

/* ── Top navigation ─────────────────────────────────────────────────────── */
.topnav {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.topnav-brand { font-size: 1.15rem; font-weight: 700; color: var(--text); }
.logo-icon { font-size: 1.3rem; }
.logo-text  { letter-spacing: -.3px; }

.topnav-links { display: flex; gap: 4px; }

.nav-link {
  color: var(--muted);
  padding: 6px 14px;
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 500;
  transition: background .15s, color .15s;
}
.nav-link:hover, .nav-link.active {
  background: rgba(88,166,255,.12);
  color: var(--accent);
  text-decoration: none;
}

/* ── Main layout ────────────────────────────────────────────────────────── */
.page-main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px;
}

.site-footer {
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  text-align: center;
  color: var(--muted);
  font-size: .82rem;
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex; align-items: center;
  background: var(--accent);
  color: #0d1117;
  border: none; border-radius: var(--radius);
  padding: 10px 22px;
  font-size: .9rem; font-weight: 600;
  cursor: pointer; text-decoration: none;
  transition: opacity .15s;
}
.btn-primary:hover { opacity: .88; text-decoration: none; }

.btn-outline {
  display: inline-flex; align-items: center;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 10px 22px;
  font-size: .9rem; font-weight: 500;
  cursor: pointer; text-decoration: none;
  transition: background .15s;
}
.btn-outline:hover { background: rgba(88,166,255,.1); text-decoration: none; }

/* ── Hero section ───────────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 60px 16px 48px;
}

.hero-badge {
  display: inline-block;
  background: rgba(88,166,255,.12);
  color: var(--accent);
  border: 1px solid rgba(88,166,255,.3);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -.5px;
  margin-bottom: 16px;
  color: var(--text);
}

.hero-accent { color: var(--accent); }

.hero p {
  max-width: 620px;
  margin: 0 auto 32px;
  color: var(--muted);
  font-size: 1.05rem;
}

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

/* ── Two-column home layout ─────────────────────────────────────────────── */
.two-col-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 0 0 40px;
}

@media (max-width: 720px) {
  .two-col-section { grid-template-columns: 1fr; }
}

.top10-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.panel-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 10px;
}

.panel-header h2 { font-size: 1.15rem; font-weight: 700; }

.panel-intro { color: var(--muted); font-size: .88rem; margin-bottom: 16px; }

.year-badge {
  background: rgba(63,185,80,.12);
  color: var(--green);
  border: 1px solid rgba(63,185,80,.3);
  border-radius: 12px;
  padding: 2px 10px;
  font-size: .75rem;
  font-weight: 600;
}

.top10-list { list-style: none; display: flex; flex-direction: column; gap: 4px; }

.top10-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--text);
  font-size: .88rem;
  transition: background .12s;
}
.top10-item:hover { background: rgba(255,255,255,.05); text-decoration: none; }

.item-num  { color: var(--accent); font-weight: 600; font-size: .8rem; min-width: 70px; }
.item-title{ flex: 1; }

.risk-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.risk-dot.risk-critical { background: var(--red); }
.risk-dot.risk-high     { background: var(--orange); }
.risk-dot.risk-medium   { background: var(--yellow); }

/* ── Info strip ─────────────────────────────────────────────────────────── */
.info-strip {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.info-item { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 160px; }
.info-icon { font-size: 1.5rem; }
.info-label { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .4px; }
.info-value { font-weight: 600; font-size: .95rem; }
.info-value a { color: var(--text); }

/* ── Section index grid ─────────────────────────────────────────────────── */
.section-header { margin-bottom: 32px; }
.section-header h1 { font-size: 2rem; font-weight: 800; margin: 8px 0; }
.section-intro { color: var(--muted); max-width: 680px; margin-top: 12px; }

.owasp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.owasp-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text);
  transition: border-color .15s, transform .1s;
  text-decoration: none;
}
.owasp-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.owasp-num  { color: var(--accent); font-size: .8rem; font-weight: 700; letter-spacing: .3px; }
.owasp-title{ font-size: .95rem; font-weight: 600; line-height: 1.35; }
.owasp-risk { margin-top: auto; }

.section-footer-note {
  color: var(--muted);
  font-size: .88rem;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ── Risk badges ────────────────────────────────────────────────────────── */
.risk-badge {
  display: inline-block;
  border-radius: 12px;
  padding: 2px 10px;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .3px;
  text-transform: uppercase;
}
.risk-badge-critical { background: rgba(248,81,73,.15);  color: var(--red);    border: 1px solid rgba(248,81,73,.4); }
.risk-badge-high     { background: rgba(210,153,34,.15); color: var(--orange); border: 1px solid rgba(210,153,34,.4); }
.risk-badge-medium   { background: rgba(227,179,65,.15); color: var(--yellow); border: 1px solid rgba(227,179,65,.4); }

/* ── Breadcrumb ─────────────────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--border); }

/* ── Challenge page header ──────────────────────────────────────────────── */
.challenge-header { margin-bottom: 24px; }
.challenge-header h1 { font-size: 1.8rem; font-weight: 800; margin-top: 10px; }
.challenge-meta { display: flex; align-items: center; gap: 10px; }

.owasp-num-badge {
  background: rgba(88,166,255,.12);
  color: var(--accent);
  border: 1px solid rgba(88,166,255,.3);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .85rem;
  font-weight: 700;
}

/* ── Theory block ───────────────────────────────────────────────────────── */
.theory-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 28px;
}

.theory-block h2 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--accent);
  margin-bottom: 14px;
}

.theory-content p  { color: var(--muted); margin-bottom: 12px; }
.theory-content ul { color: var(--muted); padding-left: 20px; margin-bottom: 12px; }
.theory-content li { margin-bottom: 4px; }
.theory-content strong { color: var(--text); }

.theory-content pre.code-block,
.code-block {
  background: #010409;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: .85rem;
  color: var(--green);
  margin: 12px 0;
}

/* ── Challenge box ──────────────────────────────────────────────────────── */
.challenge-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
}

.challenge-box-header {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid var(--border);
}

.challenge-num {
  background: rgba(88,166,255,.12);
  color: var(--accent);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  white-space: nowrap;
}

.challenge-box-header h3 { font-size: 1rem; font-weight: 600; }

.challenge-description {
  padding: 16px 20px 0;
  color: var(--muted);
  font-size: .9rem;
}

/* ── Hint ───────────────────────────────────────────────────────────────── */
.hint-block {
  margin: 14px 20px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: rgba(255,255,255,.02);
  overflow: hidden;
}

.hint-block summary {
  padding: 10px 14px;
  cursor: pointer;
  color: var(--accent);
  font-size: .88rem;
  font-weight: 500;
  user-select: none;
}
.hint-block summary:hover { background: rgba(88,166,255,.06); }

.hint-body {
  padding: 12px 14px;
  color: var(--muted);
  font-size: .88rem;
  border-top: 1px solid var(--border);
}
.hint-body code {
  background: #010409;
  color: var(--green);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .85rem;
}

/* ── Challenge form ─────────────────────────────────────────────────────── */
.challenge-form-wrapper { padding: 16px 20px 20px; }

.challenge-form { display: flex; flex-direction: column; gap: 12px; }

.form-row { display: flex; flex-direction: column; gap: 6px; }

.form-row label {
  font-size: .82rem;
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .4px;
}

.form-row input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--text);
  font-size: .9rem;
  width: 100%;
  transition: border-color .15s;
}
.form-row input:focus { outline: none; border-color: var(--accent); }

/* ── Challenge nav ──────────────────────────────────────────────────────── */
.challenge-nav {
  display: flex;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  margin-top: 28px;
}

/* ── Result page ────────────────────────────────────────────────────────── */
.result-page { max-width: 720px; }

.result-vuln-badge {
  display: inline-block;
  background: rgba(248,81,73,.12);
  color: var(--red);
  border: 1px solid rgba(248,81,73,.3);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .82rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.result-page h1 { font-size: 1.6rem; font-weight: 800; margin-bottom: 20px; }

.result-content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.result-content p  { color: var(--muted); margin-bottom: 12px; }
.result-content strong { color: var(--text); }

/* Flag value display */
.flag-value {
  display: inline-block;
  background: rgba(63,185,80,.1);
  color: var(--green);
  border: 1px solid rgba(63,185,80,.3);
  border-radius: 6px;
  padding: 6px 14px;
  font-family: ui-monospace, monospace;
  font-size: .9rem;
  font-weight: 600;
  word-break: break-all;
}

/* ── Utility ────────────────────────────────────────────────────────────── */
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }