:root {
  color-scheme: dark;
  --ink: #e8fff3;
  --muted: #9fcdb6;
  --dim: #638a76;
  --bg: #03100a;
  --bg-2: #071910;
  --panel: rgba(5, 24, 15, 0.82);
  --panel-strong: rgba(8, 34, 22, 0.94);
  --line: rgba(69, 255, 157, 0.28);
  --line-strong: rgba(105, 255, 178, 0.68);
  --green: #45ff9d;
  --green-soft: #b8ffd8;
  --amber: #ffd166;
  --red: #ff6b6b;
  --cyan: #55d6ff;
  --purple: #b569ff;
  --shadow: 0 26px 70px rgba(0, 0, 0, 0.46), 0 0 34px rgba(69, 255, 157, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

main,
section,
article,
aside,
div,
form,
fieldset,
p,
h1,
h2,
h3 {
  min-width: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  width: 100%;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(69, 255, 157, 0.16), transparent 34%),
    radial-gradient(circle at 84% 20%, rgba(85, 214, 255, 0.12), transparent 32%),
    linear-gradient(135deg, #020806 0%, #06170e 48%, #03100a 100%);
  color: var(--ink);
  font-family: Inter, Segoe UI, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
}

body::before {
  background:
    linear-gradient(rgba(69, 255, 157, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(69, 255, 157, 0.03) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 86%);
}

body::after {
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.035) 0,
    rgba(255, 255, 255, 0.035) 1px,
    transparent 1px,
    transparent 5px
  );
  opacity: 0.24;
  mix-blend-mode: soft-light;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

::selection {
  background: var(--green);
  color: #03100a;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 12px clamp(18px, 4vw, 56px);
  background: rgba(2, 12, 7, 0.88);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.28);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 250px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #061b10;
  color: var(--green);
  font-family: Consolas, "Courier New", monospace;
  font-weight: 900;
  box-shadow: inset 0 0 18px rgba(69, 255, 157, 0.18), 0 0 18px rgba(69, 255, 157, 0.18);
}

.brand-mark::after {
  position: absolute;
  right: 5px;
  bottom: 5px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 14px var(--green);
  content: "";
  animation: pulseDot 1.8s ease-in-out infinite;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: Consolas, "Courier New", monospace;
  letter-spacing: 0;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.nav a {
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--muted);
  font-weight: 800;
  font-size: 0.92rem;
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.nav a::before {
  content: "# ";
  color: var(--green);
}

.nav a:hover,
.nav a:focus-visible {
  border-color: var(--line);
  background: rgba(69, 255, 157, 0.1);
  color: var(--ink);
  outline: none;
  transform: translateY(-1px);
}

.lesson-section {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(42px, 7vw, 78px) 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  align-items: center;
  gap: clamp(28px, 4vw, 48px);
  min-height: calc(100vh - 76px);
  padding-top: 34px;
}

.hero-copy {
  max-width: 690px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "./";
  color: var(--amber);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: clamp(2.4rem, 4.8vw, 5rem);
  line-height: 0.96;
  overflow-wrap: break-word;
  text-shadow: 0 0 34px rgba(69, 255, 157, 0.22);
}

h1::after {
  display: inline-block;
  width: 0.55ch;
  margin-left: 0.08em;
  color: var(--green);
  content: "_";
  animation: blink 1.08s steps(2, start) infinite;
}

h2 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  text-shadow: 0 0 22px rgba(69, 255, 157, 0.15);
}

h3 {
  color: var(--green-soft);
  font-size: 1.2rem;
}

.lede {
  max-width: 620px;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
  overflow-wrap: anywhere;
}

.target-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.target-grid article,
.info-card,
.routine-panel,
.scenario-card,
.summary-panel,
.feedback-panel,
.result-panel,
.quiz fieldset {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-strong), var(--panel));
  box-shadow: var(--shadow);
}

.target-grid article::before,
.info-card::before,
.routine-panel::before,
.scenario-card::before,
.summary-panel::before,
.feedback-panel::before,
.result-panel::before,
.quiz fieldset::before {
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  opacity: 0.75;
  content: "";
}

.target-grid article {
  min-height: 154px;
  padding: 16px;
  transition: border-color 220ms ease, transform 220ms ease, box-shadow 220ms ease;
}

.target-grid article:hover,
.info-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 30px rgba(69, 255, 157, 0.12);
  transform: translateY(-4px);
}

.target-grid strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
}

.target-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  overflow-wrap: anywhere;
}

.icon-dot {
  display: block;
  width: 30px;
  height: 8px;
  margin-bottom: 14px;
  border-radius: 999px;
  box-shadow: 0 0 18px currentColor;
}

.icon-dot.threat {
  background: var(--red);
  color: var(--red);
}

.icon-dot.defense {
  background: var(--green);
  color: var(--green);
}

.icon-dot.ethics {
  background: var(--amber);
  color: var(--amber);
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-visual::before {
  position: absolute;
  inset: -12px;
  z-index: -1;
  border: 1px solid rgba(69, 255, 157, 0.25);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(69, 255, 157, 0.16), rgba(85, 214, 255, 0.08));
  content: "";
  filter: blur(2px);
}

.hero-visual::after {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  background:
    linear-gradient(rgba(69, 255, 157, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(69, 255, 157, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  content: "";
  mix-blend-mode: screen;
  pointer-events: none;
}

.hero-terminal {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(1, 8, 5, 0.97);
  box-shadow: var(--shadow);
  font-family: Consolas, "Courier New", monospace;
  font-size: clamp(0.78rem, 1.3vw, 0.92rem);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  background: rgba(8, 28, 17, 0.95);
  border-bottom: 1px solid var(--line);
}

.terminal-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.terminal-dot:nth-child(1) { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #febc2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.terminal-title {
  margin-left: 4px;
  color: var(--dim);
  font-size: 0.75rem;
}

.terminal-body {
  display: grid;
  gap: 5px;
  padding: 18px 20px 22px;
}

.terminal-body p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  white-space: pre-wrap;
}

.t-prompt { color: var(--green); }
.t-green  { color: var(--green); }
.t-amber  { color: var(--amber); }
.t-red    { color: var(--red); }
.t-dim    { color: var(--dim); }
.t-indent { padding-left: 1.6ch; }

.terminal-cursor {
  color: var(--green);
  animation: blink 1.08s steps(2, start) infinite;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 24px;
  align-items: start;
}

.section-copy {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.05rem;
  overflow-wrap: anywhere;
}

.section-copy strong {
  color: var(--green-soft);
  font-family: Consolas, "Courier New", monospace;
}

.choice-row,
.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
}

.choice-button,
.primary-button,
.ghost-button,
.scenario-tab,
.defense-card {
  min-height: 44px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 10px 14px;
  font-weight: 900;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.choice-button,
.ghost-button,
.scenario-tab,
.defense-card {
  background: rgba(5, 24, 15, 0.88);
  color: var(--green-soft);
}

.choice-button:hover,
.choice-button.selected,
.scenario-tab:hover,
.scenario-tab.active,
.ghost-button:hover,
.defense-card:hover,
.defense-card.is-selected {
  border-color: var(--green);
  background: rgba(69, 255, 157, 0.12);
  box-shadow: 0 0 22px rgba(69, 255, 157, 0.13);
  color: var(--ink);
  transform: translateY(-2px);
}

.primary-button {
  border-color: rgba(69, 255, 157, 0.88);
  background: linear-gradient(135deg, #2afc8f, #10b86c);
  color: #021008;
  box-shadow: 0 10px 28px rgba(69, 255, 157, 0.18);
}

.primary-button:hover,
.primary-button:focus-visible {
  background: linear-gradient(135deg, #7affbc, #2dfc91);
  box-shadow: 0 0 28px rgba(69, 255, 157, 0.36);
  outline: none;
  transform: translateY(-2px);
}

.feedback-panel,
.result-panel {
  min-height: 64px;
  padding: 16px;
  color: var(--muted);
  transition: border-color 200ms ease, background 200ms ease, transform 200ms ease;
}

.feedback-panel.good,
.result-panel.good {
  border-color: rgba(69, 255, 157, 0.78);
  background: linear-gradient(180deg, rgba(17, 74, 44, 0.95), rgba(6, 36, 21, 0.92));
  color: var(--green-soft);
}

.feedback-panel.warn,
.result-panel.warn {
  border-color: rgba(255, 209, 102, 0.74);
  background: linear-gradient(180deg, rgba(76, 55, 18, 0.94), rgba(38, 29, 12, 0.9));
  color: #ffe6a7;
}

.routine-panel,
.summary-panel {
  padding: 22px;
}

.routine-panel {
  font-family: Consolas, "Courier New", monospace;
}

.routine-panel h3::before,
.summary-panel h3::before,
.scenario-card h3::before {
  color: var(--green);
  content: "> ";
}

.routine-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
}

.section-heading {
  margin-bottom: 22px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.info-card {
  min-height: 230px;
  padding: 18px;
  transition: border-color 220ms ease, transform 220ms ease, box-shadow 220ms ease;
}

.info-card h3 {
  margin-bottom: 10px;
}

.info-card p {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.info-card strong {
  color: var(--green-soft);
}

.defense-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.defense-strip span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(69, 255, 157, 0.09);
  color: var(--green-soft);
  padding: 8px 12px;
  font-family: Consolas, "Courier New", monospace;
  font-weight: 800;
  box-shadow: inset 0 0 18px rgba(69, 255, 157, 0.05);
}

.match-activity {
  display: grid;
  gap: 18px;
}

.defense-bank {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.defense-card {
  min-height: 104px;
  text-align: left;
  font-family: Consolas, "Courier New", monospace;
  line-height: 1.35;
}

.defense-card::before {
  display: block;
  margin-bottom: 8px;
  color: var(--green);
  content: "defense.strategy";
  font-size: 0.74rem;
}

.defense-card.is-dragging {
  opacity: 0.58;
  transform: scale(0.98);
}

.defense-card.is-placed {
  border-style: dashed;
  color: var(--dim);
  opacity: 0.42;
}

.threat-drop-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.drop-zone {
  position: relative;
  display: grid;
  min-height: 244px;
  align-content: start;
  gap: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-strong), var(--panel));
  padding: 18px;
  box-shadow: var(--shadow);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.drop-zone::before {
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  content: "";
}

.drop-zone h3 {
  margin-bottom: 2px;
}

.drop-zone p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  overflow-wrap: anywhere;
}

.drop-zone.is-over,
.drop-zone:focus-visible {
  border-color: var(--green);
  box-shadow: 0 0 30px rgba(69, 255, 157, 0.22);
  outline: none;
  transform: translateY(-2px);
}

.drop-zone.is-correct {
  border-color: rgba(69, 255, 157, 0.9);
}

.drop-zone.is-incorrect {
  border-color: rgba(255, 107, 107, 0.9);
}

.drop-slot {
  display: grid;
  min-height: 86px;
  margin-top: 8px;
  place-items: center;
  border: 1px dashed rgba(105, 255, 178, 0.4);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.18);
  color: var(--dim);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.9rem;
  text-align: center;
}

.drop-slot .defense-card {
  width: 100%;
  min-height: 84px;
  opacity: 1;
}

.scenario-layout {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.scenario-tabs {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 8px;
}

.scenario-tab {
  width: 100%;
  text-align: left;
}

.scenario-tab.active::after {
  float: right;
  color: var(--green);
  content: "LIVE";
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.7rem;
}

.scenario-card {
  padding: clamp(18px, 3vw, 28px);
}

.scenario-card.is-switching {
  animation: terminalSwap 260ms ease both;
}

.scenario-meta {
  margin-bottom: 6px;
  color: var(--green);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}

#scenario-text {
  color: var(--muted);
  font-size: 1.05rem;
  overflow-wrap: anywhere;
}

.triage-form,
.exit-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--green-soft);
  font-weight: 800;
}

select,
textarea,
input[type="text"] {
  width: 100%;
  border: 1px solid rgba(105, 255, 178, 0.3);
  border-radius: var(--radius);
  background: rgba(1, 10, 6, 0.9);
  color: var(--ink);
  padding: 11px 12px;
  font-family: Consolas, "Courier New", monospace;
  font-weight: 500;
  transition: border-color 170ms ease, box-shadow 170ms ease, background 170ms ease;
}

select {
  color-scheme: dark;
}

textarea {
  resize: vertical;
}

select:focus,
textarea:focus,
input[type="text"]:focus {
  border-color: var(--green);
  background: rgba(2, 17, 10, 0.98);
  box-shadow: 0 0 0 3px rgba(69, 255, 157, 0.14), 0 0 24px rgba(69, 255, 157, 0.12);
  outline: none;
}

::placeholder {
  color: rgba(159, 205, 182, 0.58);
}

.wide-label,
.form-actions,
.triage-form .result-panel {
  grid-column: 1 / -1;
}

.quiz {
  display: grid;
  gap: 12px;
}

.quiz fieldset {
  margin: 0;
  padding: 18px;
  transition: border-color 200ms ease, transform 200ms ease;
}

.quiz fieldset:hover {
  border-color: var(--line-strong);
  transform: translateX(3px);
}

.quiz legend {
  padding: 0 6px;
  color: var(--green-soft);
  font-weight: 900;
}

.quiz label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 10px;
  color: var(--muted);
  font-weight: 600;
  overflow-wrap: anywhere;
}

.quiz input[type="radio"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--green);
}

.exit-form {
  grid-template-columns: minmax(0, 1fr);
}

.summary-panel {
  min-height: 280px;
}

.summary-panel p {
  min-height: 126px;
  color: var(--muted);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.site-footer {
  display: grid;
  gap: 4px;
  padding: 28px 16px 34px;
  border-top: 1px solid var(--line);
  background: rgba(2, 12, 7, 0.9);
  color: var(--dim);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 560ms ease, transform 560ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.target-grid article:nth-child(2),
.info-card:nth-child(2) {
  transition-delay: 80ms;
}

.target-grid article:nth-child(3),
.info-card:nth-child(3) {
  transition-delay: 150ms;
}

.info-card:nth-child(4) {
  transition-delay: 220ms;
}

@keyframes blink {
  0%,
  45% {
    opacity: 1;
  }
  46%,
  100% {
    opacity: 0;
  }
}

@keyframes pulseDot {
  0%,
  100% {
    opacity: 0.38;
    transform: scale(0.82);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes terminalSwap {
  0% {
    opacity: 0.5;
    transform: translateY(8px);
    filter: blur(2px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: rgba(69, 255, 157, 0.28);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(69, 255, 157, 0.55);
}

/* ── Reading progress bar ─────────────────────────────────── */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--green), var(--cyan));
  box-shadow: 0 0 14px rgba(69, 255, 157, 0.65);
  pointer-events: none;
  transition: width 80ms linear;
}

/* ── Nav active state ─────────────────────────────────────── */
.nav a.active {
  border-color: rgba(69, 255, 157, 0.45);
  background: rgba(69, 255, 157, 0.1);
  color: var(--green);
}

/* ── Threat badge labels ──────────────────────────────────── */
.threat-badge {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  border: 1px solid;
  border-radius: 4px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.threat-badge--phi {
  border-color: rgba(255, 107, 107, 0.45);
  background: rgba(255, 107, 107, 0.1);
  color: var(--red);
}

.threat-badge--soc {
  border-color: rgba(255, 209, 102, 0.45);
  background: rgba(255, 209, 102, 0.1);
  color: var(--amber);
}

.threat-badge--mal {
  border-color: rgba(85, 214, 255, 0.45);
  background: rgba(85, 214, 255, 0.1);
  color: var(--cyan);
}

.threat-badge--ran {
  border-color: rgba(181, 105, 255, 0.45);
  background: rgba(181, 105, 255, 0.1);
  color: var(--purple);
}

/* ── Threat-specific info-card colors ─────────────────────── */
.info-card:nth-child(1) {
  border-left: 2px solid rgba(255, 107, 107, 0.35);
}

.info-card:nth-child(1)::before {
  background: linear-gradient(90deg, transparent, var(--red), transparent);
}

.info-card:nth-child(1) h3 {
  color: var(--red);
}

.info-card:nth-child(1):hover {
  border-color: rgba(255, 107, 107, 0.7);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 32px rgba(255, 107, 107, 0.15);
}

.info-card:nth-child(2) {
  border-left: 2px solid rgba(255, 209, 102, 0.35);
}

.info-card:nth-child(2)::before {
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
}

.info-card:nth-child(2) h3 {
  color: var(--amber);
}

.info-card:nth-child(2):hover {
  border-color: rgba(255, 209, 102, 0.7);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 32px rgba(255, 209, 102, 0.15);
}

.info-card:nth-child(3) {
  border-left: 2px solid rgba(85, 214, 255, 0.35);
}

.info-card:nth-child(3)::before {
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}

.info-card:nth-child(3) h3 {
  color: var(--cyan);
}

.info-card:nth-child(3):hover {
  border-color: rgba(85, 214, 255, 0.7);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 32px rgba(85, 214, 255, 0.15);
}

.info-card:nth-child(4) {
  border-left: 2px solid rgba(181, 105, 255, 0.35);
}

.info-card:nth-child(4)::before {
  background: linear-gradient(90deg, transparent, var(--purple), transparent);
}

.info-card:nth-child(4) h3 {
  color: var(--purple);
}

.info-card:nth-child(4):hover {
  border-color: rgba(181, 105, 255, 0.7);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.38), 0 0 32px rgba(181, 105, 255, 0.15);
}

/* ── Defense strip hover ──────────────────────────────────── */
.defense-strip span {
  cursor: default;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.defense-strip span:hover {
  border-color: var(--green);
  background: rgba(69, 255, 157, 0.16);
  box-shadow: 0 0 16px rgba(69, 255, 157, 0.15);
  transform: translateY(-2px);
}


@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 920px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero,
  .split-section,
  .scenario-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .target-grid,
  .info-grid,
  .defense-bank,
  .threat-drop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .triage-form {
    grid-template-columns: 1fr;
  }

  .scenario-tabs {
    position: static;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .scenario-tab {
    text-align: center;
  }

  .scenario-tab.active::after {
    display: none;
  }
}

@media (max-width: 560px) {
  .topbar {
    gap: 10px;
    padding: 12px;
  }

  .lesson-section {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 38px 12px;
  }

  .brand {
    width: 100%;
    min-width: 0;
  }

  .brand strong {
    font-size: 0.93rem;
  }

  .nav {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    width: 100%;
    gap: 6px;
    padding-bottom: 2px;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav a {
    flex-shrink: 0;
    white-space: nowrap;
    padding: 7px 10px;
  }

  h1 {
    font-size: clamp(2.25rem, 13vw, 3.35rem);
    line-height: 1;
  }

  .eyebrow {
    overflow-wrap: anywhere;
  }

  .target-grid,
  .info-grid,
  .defense-bank,
  .threat-drop-grid {
    grid-template-columns: 1fr;
  }

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