/* ============================================================
   THE ARCADE BORNE — Main Stylesheet
   Design: 1980s arcade aesthetic
   Font: Press Start 2P (Google Fonts)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

/* ============================================================
   CSS CUSTOM PROPERTIES
   ============================================================ */

:root {
  --black:   #0a0a0a;
  --cyan:    #00ffff;
  --magenta: #ff00ff;
  --yellow:  #ffff00;
  --green:   #00ff00;
  --red:     #ff0000;
  --white:   #ffffff;
  --grey:    #333333;
  --dark-grey: #1a1a1a;

  --glow-cyan:    0 0 8px #00ffff, 0 0 20px #00ffff, 0 0 40px #00ffff;
  --glow-magenta: 0 0 8px #ff00ff, 0 0 20px #ff00ff, 0 0 40px #ff00ff;
  --glow-yellow:  0 0 8px #ffff00, 0 0 20px #ffff00, 0 0 40px #ffff00;
  --glow-green:   0 0 8px #00ff00, 0 0 20px #00ff00, 0 0 40px #00ff00;
  --glow-red:     0 0 8px #ff0000, 0 0 20px #ff0000, 0 0 40px #ff0000;

  --font: 'Press Start 2P', monospace;
}

/* ============================================================
   RESET & BASE
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--black);
  color: var(--white);
  font-family: var(--font);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ============================================================
   SCANLINES EFFECT (CRT)
   ============================================================ */

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.15) 2px,
    rgba(0, 0, 0, 0.15) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* CRT screen vignette */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    ellipse at center,
    transparent 60%,
    rgba(0, 0, 0, 0.6) 100%
  );
  pointer-events: none;
  z-index: 9998;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font);
  line-height: 1.4;
}

p, span, a, button, input, label {
  font-family: var(--font);
}

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
}

/* ============================================================
   ARCADE CONTAINER (main CRT screen wrapper)
   ============================================================ */

.arcade-screen {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
  border: 4px solid var(--cyan);
  box-shadow: var(--glow-cyan), inset 0 0 40px rgba(0, 255, 255, 0.05);
  min-height: 100vh;
  position: relative;
}

.arcade-screen--narrow {
  max-width: 800px;
}

/* ============================================================
   SITE HEADER
   ============================================================ */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0 8px;
  border-bottom: 2px solid var(--grey);
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 12px;
}

.site-header__logo {
  font-size: 0.5rem;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.site-header__controls {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ============================================================
   HEADER SOCIAL LINKS
   ============================================================ */

.header-link {
  font-family: var(--font);
  font-size: 0.38rem;
  color: var(--cyan);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 6px;
  border: 1px solid transparent;
  transition: color 0.1s, text-shadow 0.1s, border-color 0.1s;
  white-space: nowrap;
}

.header-link:hover,
.header-link:focus {
  color: var(--magenta);
  text-shadow: var(--glow-magenta);
  border-color: var(--magenta);
  outline: none;
}

/* ============================================================
   LANG TOGGLE BUTTON
   ============================================================ */

.btn-lang {
  background: transparent;
  border: 2px solid var(--yellow);
  color: var(--yellow);
  font-family: var(--font);
  font-size: 0.5rem;
  padding: 6px 10px;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.1s, box-shadow 0.1s;
  image-rendering: pixelated;
}

.btn-lang:hover,
.btn-lang:focus {
  background: var(--yellow);
  color: var(--black);
  box-shadow: var(--glow-yellow);
  outline: none;
}

/* ============================================================
   BACK BUTTON
   ============================================================ */

.btn-back {
  background: transparent;
  border: 2px solid var(--grey);
  color: var(--grey);
  font-family: var(--font);
  font-size: 0.5rem;
  padding: 6px 10px;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.1s;
}

.btn-back:hover,
.btn-back:focus {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--glow-cyan);
  outline: none;
}

/* ============================================================
   HERO TITLE
   ============================================================ */

.hero {
  text-align: center;
  padding: 40px 0 48px;
}

.hero__title {
  font-size: clamp(1.2rem, 4vw, 2.2rem);
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
  text-transform: uppercase;
  letter-spacing: 4px;
  animation: blink-glow 1.4s infinite;
  margin-bottom: 24px;
  line-height: 1.6;
}

.hero__subtitle {
  font-size: clamp(0.45rem, 1.5vw, 0.7rem);
  color: var(--magenta);
  text-shadow: var(--glow-magenta);
  letter-spacing: 6px;
  text-transform: uppercase;
  animation: blink-subtle 2s infinite;
}

/* ============================================================
   GAME GRID (main menu)
   ============================================================ */

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  padding: 0 0 48px;
}

.game-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--magenta);
  padding: 32px 16px;
  background: var(--dark-grey);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.1s;
  position: relative;
  overflow: hidden;
  min-height: 180px;
}

.game-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(255,0,255,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.game-card:hover,
.game-card:focus {
  border-color: var(--yellow);
  box-shadow: var(--glow-yellow);
  transform: translateY(-2px);
  outline: none;
}

.game-card:hover .game-card__title {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
}

.game-card__icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 8px var(--magenta));
}

.game-card__title {
  font-size: clamp(0.55rem, 1.8vw, 0.75rem);
  color: var(--magenta);
  text-shadow: var(--glow-magenta);
  text-transform: uppercase;
  letter-spacing: 2px;
  text-align: center;
  transition: all 0.1s;
}

.game-card__desc {
  font-size: 0.4rem;
  color: var(--grey);
  text-align: center;
  margin-top: 12px;
  line-height: 1.8;
}

/* ============================================================
   INSERT COIN PROMPT
   ============================================================ */

.insert-coin {
  text-align: center;
  font-size: 0.55rem;
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  text-transform: uppercase;
  letter-spacing: 4px;
  animation: blink 1s infinite;
  margin: 24px 0;
}

/* ============================================================
   HALL OF FAME / SCORES TABLE
   ============================================================ */

.hall-of-fame {
  border: 3px solid var(--green);
  padding: 24px;
  background: var(--dark-grey);
  box-shadow: var(--glow-green);
  margin-bottom: 32px;
}

.hall-of-fame__title {
  font-size: clamp(0.6rem, 2vw, 0.9rem);
  color: var(--green);
  text-shadow: var(--glow-green);
  text-align: center;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 3px;
  animation: blink-subtle 2.5s infinite;
}

.scores-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.4rem;
}

.scores-table th {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  padding: 8px 6px;
  text-align: left;
  border-bottom: 2px solid var(--yellow);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.scores-table td {
  padding: 8px 6px;
  border-bottom: 1px solid var(--grey);
}

.scores-table tr:nth-child(odd) td {
  background: rgba(0, 255, 0, 0.04);
}

.scores-table tr:nth-child(even) td {
  background: rgba(0, 0, 0, 0.2);
}

.scores-table tr:first-child td {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
}

.scores-table tr:nth-child(2) td {
  color: #cccccc;
}

.scores-table tr:nth-child(3) td {
  color: #cd7f32;
}

.score-rank {
  color: var(--green);
  text-shadow: var(--glow-green);
}

.score-initials {
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
}

.no-scores {
  text-align: center;
  color: var(--grey);
  font-size: 0.45rem;
  padding: 24px;
  line-height: 2;
}

/* ============================================================
   GAME PAGE LAYOUT
   ============================================================ */

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.game-title {
  font-size: clamp(0.7rem, 2.5vw, 1.1rem);
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.game-hud {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
}

.hud-item {
  font-size: 0.45rem;
  text-transform: uppercase;
}

.hud-item__label {
  color: var(--grey);
  display: block;
  margin-bottom: 4px;
}

.hud-item__value {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  font-size: 0.65rem;
}

/* ============================================================
   DIFFICULTY SELECTOR
   ============================================================ */

.difficulty-selector {
  text-align: center;
  padding: 48px 16px;
}

.difficulty-selector__title {
  font-size: clamp(0.6rem, 2vw, 0.9rem);
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
  margin-bottom: 40px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.difficulty-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 32px;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  font-family: var(--font);
  font-size: 0.55rem;
  text-transform: uppercase;
  padding: 12px 20px;
  border: 3px solid;
  background: transparent;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.1s;
  image-rendering: pixelated;
  line-height: 1.4;
}

.btn:focus {
  outline: 2px solid var(--white);
  outline-offset: 2px;
}

.btn--easy {
  border-color: var(--green);
  color: var(--green);
}

.btn--easy:hover,
.btn--easy:focus {
  background: var(--green);
  color: var(--black);
  box-shadow: var(--glow-green);
}

.btn--medium {
  border-color: var(--yellow);
  color: var(--yellow);
}

.btn--medium:hover,
.btn--medium:focus {
  background: var(--yellow);
  color: var(--black);
  box-shadow: var(--glow-yellow);
}

.btn--hard {
  border-color: var(--red);
  color: var(--red);
}

.btn--hard:hover,
.btn--hard:focus {
  background: var(--red);
  color: var(--black);
  box-shadow: var(--glow-red);
}

.btn--primary {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--primary:hover,
.btn--primary:focus {
  background: var(--cyan);
  color: var(--black);
  box-shadow: var(--glow-cyan);
}

.btn--magenta {
  border-color: var(--magenta);
  color: var(--magenta);
}

.btn--magenta:hover,
.btn--magenta:focus {
  background: var(--magenta);
  color: var(--black);
  box-shadow: var(--glow-magenta);
}

.btn--disabled,
.btn:disabled {
  border-color: var(--grey);
  color: var(--grey);
  cursor: not-allowed;
  opacity: 0.5;
}

.btn--disabled:hover {
  background: transparent;
  box-shadow: none;
  color: var(--grey);
}

.btn--large {
  font-size: 0.65rem;
  padding: 16px 28px;
}

.btn--small {
  font-size: 0.4rem;
  padding: 8px 12px;
}

/* ============================================================
   GAME AREA
   ============================================================ */

.game-area {
  border: 3px solid var(--grey);
  padding: 24px;
  background: rgba(0, 0, 0, 0.4);
  min-height: 300px;
  position: relative;
}

.game-result {
  text-align: center;
  padding: 48px 16px;
}

.game-result__title {
  font-size: clamp(0.8rem, 3vw, 1.4rem);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 24px;
  animation: blink-glow 1s infinite;
}

.game-result__title--win {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
}

.game-result__title--lose {
  color: var(--red);
  text-shadow: var(--glow-red);
}

.game-result__score {
  font-size: clamp(1rem, 4vw, 2rem);
  color: var(--green);
  text-shadow: var(--glow-green);
  margin-bottom: 32px;
}

.game-result__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

/* ============================================================
   SCORE ENTRY (3-letter initials)
   ============================================================ */

.score-entry {
  text-align: center;
  padding: 32px 16px;
  border: 3px solid var(--yellow);
  background: var(--dark-grey);
  box-shadow: var(--glow-yellow);
  margin: 24px 0;
}

.score-entry__title {
  font-size: 0.65rem;
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  margin-bottom: 24px;
  text-transform: uppercase;
}

.score-entry__letters {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.letter-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.letter-slot__btn {
  background: transparent;
  border: none;
  color: var(--cyan);
  font-family: var(--font);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  transition: color 0.1s, text-shadow 0.1s;
}

.letter-slot__btn:hover {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
}

.letter-slot__char {
  font-size: 1.4rem;
  color: var(--white);
  text-shadow: 0 0 10px rgba(255,255,255,0.5);
  border: 2px solid var(--cyan);
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-cyan);
}

.letter-slot__active .letter-slot__char {
  border-color: var(--yellow);
  box-shadow: var(--glow-yellow);
  animation: blink-border 0.7s infinite;
}

/* ============================================================
   PORT MATCH GAME
   ============================================================ */

.port-match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin: 24px 0;
}

.port-match-col__title {
  font-size: 0.45rem;
  color: var(--grey);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  text-align: center;
}

.port-item {
  display: block;
  width: 100%;
  font-family: var(--font);
  font-size: 0.45rem;
  padding: 10px 14px;
  border: 2px solid var(--grey);
  background: var(--dark-grey);
  color: var(--white);
  cursor: pointer;
  text-align: left;
  margin-bottom: 8px;
  transition: all 0.1s;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.port-item:hover,
.port-item.selected {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--glow-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.port-item.matched {
  border-color: var(--green);
  color: var(--green);
  background: rgba(0, 255, 0, 0.08);
  cursor: default;
  animation: match-flash 0.3s ease;
}

.port-item.error {
  border-color: var(--red);
  color: var(--red);
  background: rgba(255, 0, 0, 0.08);
  animation: error-flash 0.3s ease;
}

.port-item.matched:hover {
  box-shadow: none;
}

/* ============================================================
   OSI PUZZLE GAME
   ============================================================ */

.osi-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.osi-pieces {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.osi-slots {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.osi-piece {
  padding: 12px 16px;
  border: 2px solid var(--magenta);
  background: var(--dark-grey);
  color: var(--magenta);
  font-family: var(--font);
  font-size: 0.4rem;
  cursor: grab;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.1s;
  user-select: none;
}

.osi-piece:hover {
  border-color: var(--yellow);
  color: var(--yellow);
  box-shadow: var(--glow-yellow);
}

.osi-piece.dragging {
  opacity: 0.4;
  cursor: grabbing;
}

.osi-piece.placed {
  opacity: 0.3;
  cursor: default;
  border-color: var(--grey);
  color: var(--grey);
}

.osi-slot {
  min-height: 48px;
  padding: 10px 16px;
  border: 2px dashed var(--grey);
  background: rgba(0,0,0,0.3);
  font-family: var(--font);
  font-size: 0.4rem;
  color: var(--grey);
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.1s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.osi-slot.drag-over {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0, 255, 255, 0.05);
  box-shadow: var(--glow-cyan);
}

.osi-slot.correct {
  border-color: var(--green);
  border-style: solid;
  color: var(--green);
  background: rgba(0, 255, 0, 0.08);
  box-shadow: var(--glow-green);
}

.osi-slot.incorrect {
  border-color: var(--red);
  border-style: solid;
  color: var(--red);
  background: rgba(255, 0, 0, 0.08);
  animation: error-flash 0.4s ease;
}

.osi-slot__num {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  min-width: 20px;
}

.osi-slot__hint {
  color: var(--grey);
  font-size: 0.35rem;
}

/* Mobile tap fallback for OSI */
.osi-piece--tappable {
  cursor: pointer;
}

.osi-piece--selected {
  border-color: var(--yellow);
  color: var(--yellow);
  box-shadow: var(--glow-yellow);
  animation: blink-border 0.5s infinite;
}

/* ============================================================
   PROTOCOL QUIZ GAME
   ============================================================ */

.quiz-question {
  font-size: clamp(0.45rem, 1.5vw, 0.6rem);
  color: var(--white);
  line-height: 2;
  margin-bottom: 32px;
  padding: 20px;
  border-left: 4px solid var(--cyan);
  background: rgba(0, 255, 255, 0.03);
}

.quiz-answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.quiz-answer {
  font-family: var(--font);
  font-size: 0.4rem;
  padding: 14px 12px;
  border: 2px solid var(--grey);
  background: var(--dark-grey);
  color: var(--white);
  cursor: pointer;
  text-align: left;
  line-height: 1.8;
  transition: all 0.1s;
  text-transform: uppercase;
}

.quiz-answer:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.quiz-answer.correct {
  border-color: var(--green);
  color: var(--green);
  background: rgba(0, 255, 0, 0.08);
  box-shadow: var(--glow-green);
  cursor: default;
}

.quiz-answer.wrong {
  border-color: var(--red);
  color: var(--red);
  background: rgba(255, 0, 0, 0.08);
  box-shadow: var(--glow-red);
  cursor: default;
}

.quiz-answer:disabled {
  cursor: default;
}

.quiz-explanation {
  font-size: 0.38rem;
  color: var(--yellow);
  line-height: 2;
  padding: 12px 16px;
  border: 1px solid var(--yellow);
  background: rgba(255, 255, 0, 0.03);
  margin-top: 16px;
}

.quiz-progress {
  font-size: 0.4rem;
  color: var(--grey);
  text-align: right;
  margin-bottom: 16px;
}

.quiz-timer {
  font-size: 0.6rem;
  color: var(--red);
  text-shadow: var(--glow-red);
  text-align: center;
  animation: blink 0.5s infinite;
}

/* ============================================================
   SUBNET CHALLENGE GAME
   ============================================================ */

.subnet-problem {
  text-align: center;
  padding: 24px;
  border: 2px solid var(--cyan);
  background: rgba(0, 255, 255, 0.03);
  margin-bottom: 24px;
}

.subnet-ip {
  font-size: clamp(1rem, 4vw, 1.8rem);
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.subnet-mask {
  font-size: clamp(0.6rem, 2vw, 0.9rem);
  color: var(--magenta);
  text-shadow: var(--glow-magenta);
}

.subnet-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.subnet-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.subnet-field__label {
  font-size: 0.38rem;
  color: var(--grey);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.subnet-field__input {
  font-family: var(--font);
  font-size: 0.5rem;
  padding: 10px 12px;
  background: var(--dark-grey);
  border: 2px solid var(--grey);
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: border-color 0.1s, box-shadow 0.1s;
  width: 100%;
}

.subnet-field__input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
  color: var(--cyan);
}

.subnet-field__input.correct {
  border-color: var(--green);
  color: var(--green);
  box-shadow: var(--glow-green);
}

.subnet-field__input.wrong {
  border-color: var(--red);
  color: var(--red);
  box-shadow: var(--glow-red);
}

.subnet-explanation {
  padding: 16px;
  border: 1px solid var(--yellow);
  background: rgba(255, 255, 0, 0.03);
  font-size: 0.38rem;
  color: var(--yellow);
  line-height: 2;
}

.subnet-explanation__title {
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  margin-bottom: 12px;
  font-size: 0.45rem;
}

/* ============================================================
   PIXEL DECORATIONS (used in ticket / header)
   ============================================================ */

.pixel-coin {
  display: inline-block;
  width: 16px;
  height: 16px;
  background: var(--yellow);
  border: 2px solid #aa8800;
  box-shadow: 0 0 6px var(--yellow);
  image-rendering: pixelated;
  border-radius: 0;
  vertical-align: middle;
  margin: 0 4px;
}

.pixel-star {
  display: inline-block;
  color: var(--yellow);
  text-shadow: var(--glow-yellow);
  font-size: 1rem;
  vertical-align: middle;
}

/* ============================================================
   FLASH MESSAGES
   ============================================================ */

.flash-message {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  font-size: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  z-index: 10000;
  border: 2px solid;
  animation: flash-in 0.2s ease;
}

.flash-message--success {
  background: rgba(0, 255, 0, 0.15);
  border-color: var(--green);
  color: var(--green);
  box-shadow: var(--glow-green);
}

.flash-message--error {
  background: rgba(255, 0, 0, 0.15);
  border-color: var(--red);
  color: var(--red);
  box-shadow: var(--glow-red);
}

/* ============================================================
   CANVAS (ticket)
   ============================================================ */

#ticket-canvas {
  display: none;
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */

.text-center { text-align: center; }
.text-cyan    { color: var(--cyan); text-shadow: var(--glow-cyan); }
.text-magenta { color: var(--magenta); text-shadow: var(--glow-magenta); }
.text-yellow  { color: var(--yellow); text-shadow: var(--glow-yellow); }
.text-green   { color: var(--green); text-shadow: var(--glow-green); }
.text-red     { color: var(--red); text-shadow: var(--glow-red); }
.text-grey    { color: var(--grey); }

.mt-sm  { margin-top: 8px; }
.mt-md  { margin-top: 16px; }
.mt-lg  { margin-top: 32px; }
.mt-xl  { margin-top: 48px; }
.mb-sm  { margin-bottom: 8px; }
.mb-md  { margin-bottom: 16px; }
.mb-lg  { margin-bottom: 32px; }

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.divider {
  border: none;
  border-top: 2px solid var(--grey);
  margin: 32px 0;
}

.section-title {
  font-size: clamp(0.55rem, 1.8vw, 0.8rem);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 24px;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  font-size: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: 1px solid;
}

.badge--easy   { border-color: var(--green);   color: var(--green); }
.badge--medium { border-color: var(--yellow);  color: var(--yellow); }
.badge--hard   { border-color: var(--red);     color: var(--red); }

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

@keyframes blink-subtle {
  0%, 70% { opacity: 1; }
  85% { opacity: 0.3; }
  100% { opacity: 1; }
}

@keyframes blink-glow {
  0%, 100% {
    text-shadow: var(--glow-cyan);
    opacity: 1;
  }
  50% {
    text-shadow: 0 0 4px var(--cyan);
    opacity: 0.85;
  }
}

@keyframes blink-border {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

@keyframes match-flash {
  0% { background: rgba(0, 255, 0, 0.5); }
  100% { background: rgba(0, 255, 0, 0.08); }
}

@keyframes error-flash {
  0% { background: rgba(255, 0, 0, 0.5); }
  100% { background: rgba(255, 0, 0, 0.08); }
}

@keyframes flash-in {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes slide-in {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

@media (max-width: 768px) {
  .arcade-screen {
    padding: 12px;
    border-width: 2px;
  }

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

  .game-card {
    padding: 20px 10px;
    min-height: 130px;
  }

  .game-card__icon {
    font-size: 1.8rem;
    margin-bottom: 12px;
  }

  .port-match-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .osi-layout {
    grid-template-columns: 1fr;
  }

  .quiz-answers {
    grid-template-columns: 1fr;
  }

  .subnet-fields {
    grid-template-columns: 1fr;
  }

  .score-entry__letters {
    gap: 8px;
  }

  .letter-slot__char {
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }

  .scores-table {
    font-size: 0.35rem;
  }

  .scores-table th,
  .scores-table td {
    padding: 6px 4px;
  }
}

@media (max-width: 480px) {
  .game-grid {
    grid-template-columns: 1fr;
  }

  .hero__title {
    font-size: 1rem;
    letter-spacing: 2px;
  }

  .hall-of-fame {
    padding: 16px 8px;
  }

  .game-hud {
    gap: 12px;
  }

  .difficulty-buttons {
    flex-direction: column;
    align-items: center;
  }
}

/* ============================================================
   HOW TO PLAY BOX
   ============================================================ */

.htp-box {
  border: 2px dashed var(--cyan);
  background: #111;
  margin: 0 auto 32px;
  max-width: 560px;
  text-align: left;
}

.htp-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 10px 16px;
  background: transparent;
  border: none;
  color: var(--cyan);
  font-family: var(--font);
  font-size: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  cursor: pointer;
  gap: 12px;
  transition: color 0.1s;
}

.htp-toggle:hover,
.htp-toggle:focus {
  color: var(--yellow);
  outline: none;
}

.htp-toggle__arrow {
  flex-shrink: 0;
  font-size: 0.5rem;
  color: var(--cyan);
  transition: color 0.1s;
}

.htp-toggle:hover .htp-toggle__arrow,
.htp-toggle:focus .htp-toggle__arrow {
  color: var(--yellow);
}

.htp-content {
  padding: 12px 16px 16px;
  border-top: 1px dashed var(--grey);
}

.htp-text {
  font-family: var(--font);
  font-size: 0.38rem;
  color: var(--white);
  line-height: 2;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.htp-text--example {
  color: var(--cyan);
  font-size: 0.35rem;
  opacity: 0.8;
}

@media (max-width: 480px) {
  .htp-text {
    font-size: 0.32rem;
  }
  .htp-text--example {
    font-size: 0.3rem;
  }
}

/* ============================================================
   CABLE CHAOS GAME
   ============================================================ */

.cc-scenario {
  font-size: 0.38rem;
  color: var(--yellow);
  line-height: 2;
  padding: 12px 16px;
  border-left: 4px solid var(--yellow);
  background: rgba(255, 255, 0, 0.03);
  margin-bottom: 20px;
  text-transform: uppercase;
}

/* Network diagram grid */
.cc-diagram {
  margin-bottom: 20px;
  padding: 16px;
  border: 2px dashed var(--grey);
  background: rgba(0, 0, 0, 0.3);
  overflow-x: auto;
}

#cc-nodes {
  min-height: 120px;
}

/* Individual device node */
.cc-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 8px;
  border: 2px solid var(--cyan);
  background: var(--dark-grey);
  box-shadow: 0 0 6px rgba(0, 255, 255, 0.15);
  text-align: center;
  min-width: 72px;
}

.cc-node__icon {
  font-size: 1.4rem;
  line-height: 1;
  filter: drop-shadow(0 0 4px var(--cyan));
}

.cc-node__label {
  font-family: var(--font);
  font-size: 0.3rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 1px;
  word-break: break-word;
  max-width: 72px;
}

/* Connection panel */
.cc-panel {
  border: 2px solid var(--grey);
  padding: 16px;
  background: rgba(0, 0, 0, 0.3);
  margin-bottom: 16px;
}

.cc-panel__title {
  font-size: 0.4rem;
  color: var(--grey);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
  text-align: center;
}

.cc-conn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--grey);
}

.cc-conn-row:last-child {
  border-bottom: none;
}

.cc-conn-label {
  font-family: var(--font);
  font-size: 0.35rem;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1px;
  min-width: 160px;
  flex-shrink: 0;
}

.cc-cable-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cc-cable-btn {
  font-family: var(--font);
  font-size: 0.32rem;
  padding: 8px 12px;
  border: 2px solid var(--grey);
  background: var(--dark-grey);
  color: var(--white);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.1s;
}

.cc-cable-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.cc-cable-btn--active {
  border-color: var(--magenta);
  color: var(--magenta);
  background: rgba(255, 0, 255, 0.08);
  box-shadow: var(--glow-magenta);
}

.cc-cable-btn--error {
  border-color: var(--red);
  color: var(--red);
  background: rgba(255, 0, 0, 0.1);
  box-shadow: var(--glow-red);
  animation: error-flash 0.4s ease;
}

/* Result overlay (inline feedback inside game area) */
.cc-result-overlay {
  margin-top: 16px;
  padding: 14px 16px;
  border: 2px solid var(--grey);
  background: rgba(0, 0, 0, 0.5);
  font-size: 0.38rem;
  line-height: 2;
  text-transform: uppercase;
}

.cc-result-msg {
  font-size: 0.45rem;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.cc-result-detail {
  font-size: 0.32rem;
  color: var(--grey);
  line-height: 2;
}

@media (max-width: 768px) {
  .cc-conn-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .cc-conn-label {
    min-width: unset;
  }
  .cc-node__icon {
    font-size: 1.1rem;
  }
  .cc-node__label {
    font-size: 0.26rem;
  }
  .cc-node {
    min-width: 56px;
    padding: 8px 4px;
  }
}

/* ============================================================
   HALL OF PINS
   ============================================================ */

.hall-of-pins {
  border: 3px solid var(--magenta);
  padding: 24px;
  background: var(--dark-grey);
  box-shadow: var(--glow-magenta);
  margin-bottom: 32px;
}

.hall-of-pins__title {
  font-size: clamp(0.6rem, 2vw, 0.9rem);
  color: var(--magenta);
  text-shadow: var(--glow-magenta);
  text-align: center;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 3px;
  animation: blink-subtle 2.5s infinite;
}

.pins-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

/* ── Individual pin card ──────────────────────────────────── */

.pin-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 12px;
  border: 2px solid var(--grey);
  background: #0d0d0d;
  text-align: center;
  position: relative;
  transition: border-color 0.15s, box-shadow 0.15s;
  gap: 8px;
}

.pin-item--unlocked {
  border-color: var(--pin-glow, var(--magenta));
  box-shadow: 0 0 8px var(--pin-glow, var(--magenta));
}

.pin-item--unlocked:hover {
  box-shadow: 0 0 16px var(--pin-glow, var(--magenta)), 0 0 4px var(--pin-glow, var(--magenta));
}

.pin-item--locked {
  opacity: 0.45;
}

/* Badge area */
.pin-item__badge {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 0 4px var(--pin-glow, #444));
}

.pin-item__badge svg {
  width: 100%;
  height: 100%;
}

.pin-item__badge--locked svg {
  filter: none;
  opacity: 0.6;
}

/* Pin name */
.pin-item__name {
  font-size: 0.32rem;
  color: var(--pin-glow, var(--magenta));
  text-shadow: 0 0 6px var(--pin-glow, var(--magenta));
  text-transform: uppercase;
  letter-spacing: 1px;
  line-height: 1.5;
}

.pin-item__name--locked {
  color: var(--grey);
  text-shadow: none;
}

/* Description */
.pin-item__desc {
  font-size: 0.28rem;
  color: #555;
  line-height: 1.7;
}

.pin-item__desc--locked {
  color: #3a3a3a;
}

/* Unlock date */
.pin-item__date {
  font-size: 0.26rem;
  color: #444;
}

/* Download button */
.pin-item__download {
  font-size: 0.28rem;
  padding: 5px 10px;
  margin-top: 4px;
  border-color: var(--pin-glow, var(--magenta));
  color: var(--pin-glow, var(--magenta));
  background: transparent;
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.1s, color 0.1s;
}

.pin-item__download:hover,
.pin-item__download:focus {
  background: var(--pin-glow, var(--magenta));
  color: var(--black);
  outline: none;
}

/* ── Tooltip on hover (desktop) ──────────────────────────── */

.pin-item--unlocked[aria-label]::after {
  content: attr(aria-label);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #111;
  border: 1px solid var(--pin-glow, #555);
  color: var(--pin-glow, #fff);
  padding: 4px 8px;
  font-size: 0.28rem;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 10;
  font-family: var(--font);
}

.pin-item--unlocked:hover::after {
  opacity: 1;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 600px) {
  .pins-grid {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 10px;
  }

  .pin-item__badge {
    width: 48px;
    height: 48px;
  }

  .hall-of-pins {
    padding: 16px 8px;
  }
}

/* ============================================================
   FIREWALL BLITZ
   ============================================================ */

.fb-policy-panel {
  background: rgba(0,255,255,0.05);
  border: 1px solid var(--cyan);
  padding: 12px 16px;
  margin-bottom: 16px;
}

.fb-policy-panel__title {
  font-size: 0.35rem;
  color: var(--cyan);
  margin-bottom: 8px;
  letter-spacing: 0.1em;
}

.fb-policy-list { list-style: none; padding: 0; }

.fb-rule {
  font-size: 0.28rem;
  color: #ccc;
  padding: 3px 0;
  border-bottom: 1px solid #222;
  line-height: 1.6;
}

.fb-packet-zone { text-align: center; margin: 16px 0; }

.fb-packet-label {
  font-size: 0.3rem;
  color: var(--yellow);
  margin-bottom: 6px;
  letter-spacing: 0.1em;
}

.fb-packet {
  font-size: 0.38rem;
  color: var(--white);
  background: #111;
  border: 2px solid var(--magenta);
  box-shadow: 0 0 10px var(--magenta);
  padding: 12px 20px;
  margin: 8px auto;
  max-width: 560px;
  word-break: break-all;
  line-height: 1.8;
}

.fb-packet-progress { font-size: 0.28rem; color: #888; margin-top: 4px; }

.fb-timer-bar-wrap {
  height: 4px;
  background: #222;
  border-radius: 2px;
  margin: 8px auto;
  max-width: 400px;
  overflow: hidden;
}

.fb-timer-bar {
  height: 100%;
  width: 100%;
  background: var(--green);
  transition: width 0.05s linear;
}

.fb-verdict-zone {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-top: 16px;
  flex-wrap: wrap;
}

.fb-verdict-btn {
  font-family: var(--font);
  font-size: 0.55rem;
  padding: 16px 36px;
  border: 3px solid;
  cursor: pointer;
  background: transparent;
  letter-spacing: 0.08em;
  transition: background 0.15s, box-shadow 0.15s;
}

.fb-verdict-btn--accept-style { color: var(--green); border-color: var(--green); }
.fb-verdict-btn--accept-style:hover:not(:disabled) { background: rgba(0,255,0,0.12); box-shadow: 0 0 12px var(--green); }
.fb-verdict-btn--deny-style { color: var(--red); border-color: var(--red); }
.fb-verdict-btn--deny-style:hover:not(:disabled) { background: rgba(255,0,0,0.12); box-shadow: 0 0 12px var(--red); }
.fb-verdict-btn--correct { background: rgba(0,255,0,0.2) !important; box-shadow: 0 0 16px var(--green) !important; }
.fb-verdict-btn--wrong   { background: rgba(255,0,0,0.2) !important; box-shadow: 0 0 16px var(--red) !important; }
.fb-verdict-btn:disabled { opacity: 0.5; cursor: default; }

/* ============================================================
   DNS CHAIN
   ============================================================ */

.dc-chain-info { text-align: center; margin-bottom: 14px; }

.dc-chain-title { font-size: 0.38rem; color: var(--cyan); margin-bottom: 4px; }

.dc-chain-desc { font-size: 0.28rem; color: #aaa; line-height: 1.6; }

.dc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 12px 0;
}

.dc-col__title { font-size: 0.3rem; color: var(--yellow); margin-bottom: 8px; letter-spacing: 0.08em; }

.dc-pieces { display: flex; flex-direction: column; gap: 6px; }

.dc-piece {
  font-size: 0.24rem;
  color: var(--white);
  background: #111;
  border: 1px solid #444;
  padding: 8px 10px;
  cursor: pointer;
  line-height: 1.5;
  transition: border-color 0.15s, background 0.15s;
}

.dc-piece:hover { border-color: var(--cyan); background: rgba(0,255,255,0.06); }

.dc-piece--selected {
  border-color: var(--magenta) !important;
  background: rgba(255,0,255,0.1) !important;
  box-shadow: 0 0 8px var(--magenta);
}

.dc-slots { display: flex; flex-direction: column; gap: 6px; }

.dc-slot {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.24rem;
  border: 1px solid #333;
  padding: 8px 10px;
  cursor: pointer;
  min-height: 36px;
  line-height: 1.5;
  transition: border-color 0.15s, background 0.15s;
}

.dc-slot--empty { border-color: #333; color: #555; background: #0d0d0d; }
.dc-slot--empty:hover { border-color: #666; }
.dc-slot--filled { border-color: #555; background: #111; color: var(--white); }
.dc-slot--filled:hover { border-color: var(--red); }
.dc-slot--wrong { border-color: var(--red) !important; background: rgba(255,0,0,0.1) !important; }

.dc-slot__num { color: var(--cyan); font-size: 0.28rem; flex-shrink: 0; min-width: 16px; }
.dc-slot__content { flex: 1; }

.dc-hint { font-size: 0.28rem; text-align: center; margin-top: 8px; min-height: 1.4em; }
.dc-feedback { font-size: 0.3rem; text-align: center; margin-top: 8px; min-height: 1.4em; }
.dc-feedback--error   { color: var(--red); }
.dc-feedback--correct { color: var(--green); }

@media (max-width: 600px) { .dc-layout { grid-template-columns: 1fr; } }

/* ============================================================
   PACKET TRACER
   ============================================================ */

.pt-topo-panel {
  background: rgba(0,255,255,0.04);
  border: 1px solid #333;
  padding: 10px 14px;
  margin-bottom: 12px;
}

.pt-title { font-size: 0.34rem; color: var(--cyan); margin-bottom: 4px; }
.pt-topo  { font-size: 0.26rem; color: #aaa; line-height: 1.6; }

.pt-hop-panel {
  background: #0d0d0d;
  border: 2px solid var(--yellow);
  box-shadow: 0 0 8px rgba(255,255,0,0.15);
  padding: 12px 16px;
  margin-bottom: 14px;
}

.pt-device-label { font-size: 0.26rem; color: var(--yellow); margin-bottom: 4px; letter-spacing: 0.1em; }
.pt-device        { font-size: 0.44rem; color: var(--magenta); margin-bottom: 8px; }
.pt-question      { font-size: 0.28rem; color: var(--white); line-height: 1.7; }

.pt-choices { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }

.pt-choice {
  font-family: var(--font);
  font-size: 0.26rem;
  color: var(--white);
  background: #111;
  border: 1px solid #444;
  padding: 10px 14px;
  text-align: left;
  cursor: pointer;
  line-height: 1.6;
  transition: border-color 0.15s, background 0.15s;
}

.pt-choice:hover:not(:disabled) { border-color: var(--cyan); background: rgba(0,255,255,0.06); }
.pt-choice--correct { border-color: var(--green) !important; background: rgba(0,255,0,0.1) !important; box-shadow: 0 0 8px var(--green); }
.pt-choice--wrong   { border-color: var(--red) !important;   background: rgba(255,0,0,0.1) !important; }
.pt-choice:disabled { cursor: default; }

.pt-feedback          { font-size: 0.26rem; text-align: center; min-height: 1.4em; line-height: 1.6; }
.pt-feedback--correct { color: var(--green); }
.pt-feedback--error   { color: var(--red); }

/* ============================================================
   VLAN MASTER
   ============================================================ */

.vm-title { font-size: 0.36rem; color: var(--cyan); text-align: center; margin-bottom: 10px; }

.vm-policy-panel {
  background: rgba(255,255,0,0.04);
  border: 1px solid var(--yellow);
  padding: 10px 14px;
  margin-bottom: 14px;
}

.vm-policy-panel__title { font-size: 0.3rem; color: var(--yellow); margin-bottom: 6px; letter-spacing: 0.08em; }
.vm-policy-list { list-style: none; padding: 0; }
.vm-rule { font-size: 0.25rem; color: #ccc; padding: 3px 0; border-bottom: 1px solid #1a1a1a; line-height: 1.6; }

.vm-table-wrap { overflow-x: auto; margin-bottom: 12px; }

.vm-table { width: 100%; border-collapse: collapse; font-size: 0.24rem; }

.vm-table th {
  font-size: 0.22rem;
  color: var(--cyan);
  border-bottom: 2px solid var(--cyan);
  padding: 6px 8px;
  text-align: left;
  white-space: nowrap;
}

.vm-table td { padding: 6px 8px; border-bottom: 1px solid #222; vertical-align: middle; }

.vm-port-id { color: var(--magenta); white-space: nowrap; font-size: 0.25rem; }
.vm-device  { color: #bbb; font-size: 0.23rem; line-height: 1.4; }

.vm-select {
  font-family: var(--font);
  font-size: 0.22rem;
  background: #111;
  color: var(--white);
  border: 1px solid #444;
  padding: 4px 6px;
  cursor: pointer;
  min-width: 80px;
}

.vm-select:focus { outline: none; border-color: var(--cyan); }
.vm-select--vlan { min-width: 60px; }
.vm-select--stp  { min-width: 100px; }

.vm-flag-label { display: flex; align-items: center; gap: 6px; font-size: 0.24rem; color: var(--red); cursor: pointer; }
.vm-flag-cb    { width: 14px; height: 14px; cursor: pointer; accent-color: var(--red); }

.vm-row--correct td { background: rgba(0,255,0,0.07); }
.vm-row--wrong   td { background: rgba(255,0,0,0.1); }

.vm-feedback          { font-size: 0.3rem; text-align: center; min-height: 1.4em; margin: 8px 0; }
.vm-feedback--error   { color: var(--red); }