:root {
  --primary-dark-bg: #0b0f19;
  --secondary-dark-bg: #121a2c;
  --card-bg: #1a1f32; 
  --primary-accent: #00bfff; /* DeepSkyBlue */
  --accent-green: #00ff7f; /* SpringGreen */
  --secondary-accent-start: #7f00ff; /* Violet */
  --secondary-accent-end: #e100ff;   /* Bright Pink/Magenta */
  --text-primary: #ffffff;
  --text-secondary: #ced4da;
  --text-muted: #adb5bd;
  --success-color: #28a745;
  --error-color: #dc3545;
  --warning-color: #ffc107;
  --border-color: rgba(0, 191, 255, 0.3); 
  --option-bg: #1f2347;
  --option-hover-bg: #2c3158;
  --disabled-bg: #343a40;
  --disabled-color: #6c757d;

  --font-primary: 'Poppins', sans-serif;
  --font-secondary: 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;
}

/* General Body Styles */
body {
  font-family: var(--font-secondary);
  background-color: var(--primary-dark-bg);
  color: var(--text-secondary);
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  box-sizing: border-box;
  overflow-x: hidden;
}

/* Animated background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(rgba(11, 15, 25, 0.97), rgba(11, 15, 25, 0.97)),
    radial-gradient(ellipse at center, rgba(127,0,255,0.1) 0%, transparent 70%),
    linear-gradient(to right, #080b14 1px, transparent 1px),
    linear-gradient(to bottom, #080b14 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 50px 50px, 50px 50px;
  background-position: 0 0, 0 0, -1px -1px, -1px -1px;
  animation: bg-pan 15s linear infinite;
  z-index: -1;
}

@keyframes bg-pan {
  0% { background-position: 0 0, 0 0, -1px -1px, -1px -1px; }
  100% { background-position: 50px 50px, 0 0, -1px -1px, -1px -1px; }
}


html {
  scroll-behavior: smooth;
}

#app-container {
  width: 100%;
  max-width: 1100px;
  padding: 20px;
  box-sizing: border-box;
}

#app-header {
  width: 100%;
  text-align: center;
  padding: 25px 0;
  margin-bottom: 0; 
  border-bottom: 1px solid var(--border-color);
  position: relative;
  background: linear-gradient(180deg, rgba(11, 15, 25, 0.9) 0%, var(--primary-dark-bg) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.home-icon-button {
  position: absolute;
  top: 50%;
  left: 20px;
  transform: translateY(-50%);
  color: var(--primary-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: 50%;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
}

.home-icon-button svg {
  width: 36px;
  height: 36px;
}

.home-icon-button:hover, .home-icon-button:focus-visible {
  background-color: rgba(0, 191, 255, 0.1);
  box-shadow: 0 0 12px rgba(0, 191, 255, 0.6);
  outline: none;
}

#app-header h1 {
  font-family: var(--font-primary);
  font-size: 2.8em;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  text-shadow: 0 0 8px rgba(0, 191, 255, 0.5);
}

#root {
  width: 100%;
}

.container {
  background-color: var(--secondary-dark-bg);
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0,0,0,0.3);
  border: 1px solid var(--border-color);
  text-align: center;
  margin: 30px 0;
}

/* Typography */
h1, h2, h3, h4, h5 {
  font-family: var(--font-primary);
  color: var(--primary-accent);
  margin-top: 0;
  font-weight: 600;
}

h2 { /* Screen titles / Question text */
  font-size: 1.8em;
  margin-bottom: 1em;
  line-height: 1.4;
  color: var(--text-primary);
}

h2[tabindex="-1"]:focus {
  outline: none;
}

p {
  font-size: 1.1em;
  line-height: 1.7;
  margin-bottom: 1.2em;
  color: var(--text-secondary);
}

.game-description {
  font-size: 1.15em;
  color: var(--text-secondary);
  margin-bottom: 2em;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}


/* Buttons */
button, .cta-button {
  font-family: var(--font-primary);
  border: none;
  padding: 12px 25px;
  font-size: 1.1em;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  margin-top: 10px;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-decoration: none;
  display: inline-block;
}

button:hover:not(:disabled), .cta-button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0,0,0,0.3);
}

button:disabled {
  background-color: var(--disabled-bg);
  background-image: none;
  color: var(--disabled-color);
  cursor: not-allowed;
  opacity: 0.7;
  box-shadow: none;
  transform: none;
}

button:focus-visible, .cta-button:focus-visible {
  outline: 3px solid var(--primary-accent);
  outline-offset: 2px;
  box-shadow: 0 0 10px var(--primary-accent);
}

.start-button, .play-again-button, .next-button, .game-card button, .cta-button {
  background-image: linear-gradient(90deg, var(--secondary-accent-start), var(--secondary-accent-end));
  color: var(--text-primary);
  padding: 15px 35px;
  font-size: 1.25em;
  box-shadow: 0 4px 15px rgba(127, 0, 255, 0.4);
  border: none;
}

.start-button:hover:not(:disabled), .play-again-button:hover:not(:disabled), .next-button:hover:not(:disabled), .game-card button:hover:not(:disabled), .cta-button:hover:not(:disabled) {
  background-image: linear-gradient(90deg, var(--secondary-accent-end), var(--secondary-accent-start)); /* Swap gradient on hover */
  box-shadow: 0 6px 20px rgba(127, 0, 255, 0.6);
}

.back-button {
  align-self: flex-start;
  background: none;
  border: none;
  color: var(--primary-accent);
  cursor: pointer;
  font-size: 1em;
  padding: 5px;
  margin-bottom: 15px;
  text-transform: none;
}

/* Welcome Screen Specifics */
.welcome-screen p {
  font-size: 1.2em;
  margin-bottom: 1.5em;
}

.welcome-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Game Screen Specifics */
.game-header {
  display: flex;
  justify-content: space-between;
  font-size: 1.1em;
  color: var(--text-muted);
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-secondary);
}

.options-container {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 25px;
  margin-bottom: 25px;
}

.option-button {
  font-family: var(--font-secondary);
  background-color: var(--option-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  text-align: left;
  padding: 18px;
  width: 100%;
  box-sizing: border-box;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 500;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.option-button:hover:not(:disabled) {
  background-color: var(--option-hover-bg);
  border-color: var(--primary-accent);
  color: var(--text-primary);
  box-shadow: 0 4px 8px rgba(0, 191, 255, 0.3);
}

.option-button:focus-visible {
  outline: 2px solid var(--primary-accent);
  outline-offset: 1px;
  border-color: var(--primary-accent);
}

.option-button.reveal-correct {
  background-color: var(--success-color) !important;
  border-color: darken(var(--success-color), 10%) !important;
  color: var(--text-primary) !important;
  opacity: 1 !important;
  box-shadow: 0 0 10px var(--success-color);
}

.option-button.incorrect {
  background-color: var(--error-color) !important;
  border-color: darken(var(--error-color), 10%) !important;
  color: var(--text-primary) !important;
  opacity: 1 !important;
  box-shadow: 0 0 10px var(--error-color);
}

.option-button.disabled-opaque {
 opacity: 0.6 !important;
 background-color: var(--option-bg) !important;
 border-color: var(--border-color) !important;
 box-shadow: none !important;
}

.feedback {
  margin-top: 15px;
  font-size: 1.1em;
  font-weight: 600;
  font-family: var(--font-primary);
  padding: 0;
  margin-bottom: 0;
}

.feedback-correct {
  color: var(--success-color);
  text-shadow: 0 0 6px var(--success-color);
}

.feedback-incorrect {
  color: var(--error-color);
  text-shadow: 0 0 6px var(--error-color);
}

.feedback-warning {
  color: var(--warning-color);
  text-shadow: 0 0 6px var(--warning-color);
}


/* Results Screen Specifics */
.results-screen h3 {
  font-size: 1.7em;
  margin-bottom: 1.5em;
  color: var(--text-primary);
}

.incorrect-answers-review {
  text-align: left;
  margin-top: 35px;
  border-top: 1px solid var(--border-color);
  padding-top: 25px;
}

.incorrect-answers-review h4 {
  font-size: 1.5em;
  color: var(--primary-accent);
  margin-bottom: 20px;
}

.incorrect-answers-review ul {
  list-style-type: none;
  padding: 0;
}

.review-item {
  background-color: var(--card-bg);
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid rgba(0, 191, 255, 0.2);
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.review-item p {
  font-size: 1.05em;
  margin-bottom: 0.6em;
  color: var(--text-secondary);
  font-family: var(--font-secondary);
}
.review-item p strong {
  color: var(--primary-accent);
  font-family: var(--font-primary);
  font-weight: 600;
}

.user-answer {
  color: var(--error-color);
  font-weight: bold;
}

.correct-answer-text {
  color: var(--success-color);
  font-weight: bold;
}

/* Accessibility */
[aria-live="polite"] {}

/* ===== NEW LANDING PAGE STYLES ===== */

.hero-section {
  text-align: center;
  padding: 100px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
}

.hero-section h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--text-primary);
  text-shadow: 0 0 15px rgba(0, 191, 255, 0.5), 0 0 30px rgba(127, 0, 255, 0.4);
  margin: 0 0 0.25em 0;
  letter-spacing: 1px;
}

.hero-section h1 span {
  color: var(--accent-green);
  text-shadow: 0 0 15px var(--accent-green);
}

.hero-tagline {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-family: var(--font-secondary);
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 2.5em auto;
  line-height: 1.7;
}

.game-grid-container {
  padding: 50px 0;
  opacity: 0;
  transform: translateY(30px);
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.8s ease-out, transform 0.6s ease-out, max-height 0.8s ease-in-out, padding 0.8s ease;
}

.game-grid-container.visible {
  opacity: 1;
  transform: translateY(0);
  max-height: 2000px; /* Should be large enough to contain the grid */
}


.game-grid-container h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1.5em;
    color: var(--text-primary);
    text-shadow: 0 0 8px rgba(0, 191, 255, 0.5);
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 25px;
}

.game-card {
  --card-accent-color: var(--primary-accent);
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
  position: relative;
}

.game-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px var(--card-accent-color);
  border-color: var(--card-accent-color);
}

.game-card-icon {
  width: 70px;
  height: 70px;
  margin-bottom: 20px;
  color: var(--card-accent-color);
  transition: color 0.3s ease, transform 0.3s ease;
}

.game-card:hover .game-card-icon {
  transform: scale(1.1);
  filter: drop-shadow(0 0 10px var(--card-accent-color));
}

.game-card h3 {
  font-size: 1.6em;
  color: var(--text-primary);
  margin-bottom: 0.5em;
}

.game-card p {
  font-size: 1em;
  color: var(--text-secondary);
  margin-bottom: auto; /* Pushes button to the bottom */
  padding-bottom: 20px;
  line-height: 1.6;
}

.game-card .play-button {
  background: var(--card-accent-color);
  color: var(--primary-dark-bg);
  font-weight: 700;
  padding: 12px 30px;
  font-size: 1em;
  border-radius: 6px;
  margin-top: auto; /* Aligns to bottom */
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  width: 80%;
}

.game-card:hover .play-button {
    background: var(--card-accent-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

/* ===== Phishing Game ===== */
.phishing-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 25px;
    text-align: left;
}
.phishing-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 15px;
}
.phishing-header p {
    margin: 5px 0;
    font-family: var(--font-mono);
}
.phishing-header span {
    color: var(--text-muted);
}
.phishing-body {
    line-height: 1.6;
}
.phishing-body a {
    color: #6495ED; /* CornflowerBlue */
}
.phishing-options {
    display: flex;
    gap: 20px;
    justify-content: center;
}
.phishing-options .option-button {
    width: 150px;
    text-align: center;
    font-size: 1.2em;
    font-weight: 600;
    color: white;
}

/* ===== CTF Game ===== */
.ctf-challenge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 2em;
}
.ctf-challenge-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}
.ctf-challenge-card:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-accent-end);
    box-shadow: 0 5px 15px rgba(225, 0, 255, 0.3);
}
.ctf-challenge-card h4 {
    margin-bottom: 10px;
    color: var(--text-primary);
}
.ctf-challenge-card p {
    margin: 0;
    font-size: 0.9em;
}
.ctf-challenge-card.solved {
    background-color: #2a3b47;
    border-color: var(--success-color);
    cursor: not-allowed;
    opacity: 0.7;
}
.ctf-challenge-card.solved h4 {
    text-decoration: line-through;
}
.ctf-flag-input {
    width: 100%;
    max-width: 400px;
    padding: 15px;
    background-color: var(--primary-dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1.1em;
    box-sizing: border-box;
}

/* ===== Interactive Game Simulators ===== */

/* Common Category Tabs */
.incident-category-tabs, .threat-category-tabs, .pentest-category-tabs, .ctf-category-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 2em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}
.category-tab-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 10px 20px;
    font-size: 1.1em;
    cursor: pointer;
    position: relative;
    transition: color 0.3s ease;
    text-transform: none;
    font-weight: 500;
}
.category-tab-button::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--primary-accent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}
.category-tab-button:hover, .category-tab-button:focus-visible {
    color: var(--text-primary);
}
.category-tab-button.active {
    font-weight: 600;
}

/* Specific Tab Colors */
.threat-category-tabs .category-tab-button.active { color: #ab63f7; }
.threat-category-tabs .category-tab-button.active::after { transform: scaleX(1); background-color: #ab63f7; }

.incident-category-tabs .category-tab-button.active { color: var(--success-color); }
.incident-category-tabs .category-tab-button.active::after { transform: scaleX(1); background-color: var(--success-color); }

.pentest-category-tabs .category-tab-button.active { color: var(--accent-green); }
.pentest-category-tabs .category-tab-button.active::after { transform: scaleX(1); background-color: var(--accent-green); }

.ctf-category-tabs .category-tab-button.active { color: var(--secondary-accent-end); }
.ctf-category-tabs .category-tab-button.active::after { transform: scaleX(1); background-color: var(--secondary-accent-end); }


/* Penetration Test Terminal */
.terminal-container {
    background-color: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    height: 400px;
    overflow-y: auto;
    font-family: var(--font-mono);
    text-align: left;
    color: #c9d1d9;
    font-size: 1em;
    line-height: 1.5;
}
.terminal-output {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-all;
}
.terminal-prompt {
    color: var(--accent-green);
    margin-right: 8px;
}

/* Incident Response Dashboard */
.incident-container {
    display: flex;
    gap: 20px;
    height: 500px;
}
.log-panel, .actions-panel {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    background-color: var(--card-bg);
}
.log-panel {
    flex: 2;
    overflow-y: auto;
    text-align: left;
    font-family: var(--font-mono);
}
.actions-panel {
    flex: 1;
}
.log-entry {
    font-size: 0.95em;
    padding-bottom: 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid #ffffff1a;
}
.log-alert { color: var(--error-color); }
.log-action { color: var(--warning-color); }
.log-info { color: var(--text-secondary); }

.command-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
}

.actions-panel {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.command-button, .action-button {
    background-color: var(--option-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    text-align: left;
    width: 100%;
    box-sizing: border-box;
    text-transform: none;
    font-family: var(--font-mono);
    font-weight: 500;
}
.command-button:hover:not(:disabled), .action-button:hover:not(:disabled) {
    background-color: var(--option-hover-bg);
    border-color: var(--primary-accent);
    color: var(--text-primary);
}

/* Incident Response Selection Grid */
.incident-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 2em;
}

.incident-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: left;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.incident-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.4);
}

.incident-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.incident-card h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.2em;
}

.incident-card-category {
    background-color: var(--primary-accent);
    color: var(--primary-dark-bg);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8em;
    font-weight: 600;
}

.incident-card-description {
    font-size: 1em;
    color: var(--text-secondary);
    flex-grow: 1;
}

.incident-card .start-button {
    font-size: 1em;
    padding: 10px 20px;
    align-self: flex-end;
}

/* Pentest Selection Grid */
.pentest-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 2em;
}

.pentest-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--accent-green);
    text-align: left;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 10px rgba(0, 255, 127, 0.2);
}

.pentest-card h3 {
    color: var(--accent-green);
    margin: 0 0 10px 0;
    font-size: 1.3em;
}

.pentest-objective {
    font-size: 1em;
    color: var(--text-secondary);
    flex-grow: 1;
    margin-bottom: 1.5em;
}

.pentest-card .start-button {
    background-image: linear-gradient(90deg, var(--accent-green), #00e06e);
    box-shadow: 0 4px 15px rgba(0, 255, 127, 0.3);
    color: var(--primary-dark-bg);
    font-weight: 700;
    font-size: 1em;
    padding: 10px 20px;
    align-self: flex-end;
}

.pentest-card .start-button:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(0, 255, 127, 0.5);
}

/* ===== Threat Modeling Game ===== */

.threat-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 2em;
}

.threat-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #8a2be2;
    text-align: left;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.threat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(138, 43, 226, 0.4);
}

.threat-card h4 {
    color: #ab63f7;
    margin: 0 0 10px 0;
}

.threat-card p {
    flex-grow: 1;
}

.threat-card .start-button {
    align-self: center;
    margin-top: 1em;
    background-image: none;
    background-color: #8a2be2;
    font-size: 1em;
    padding: 10px 20px;
}

.threat-modeling-game .game-description {
    max-width: 800px;
}

.progress-bar-container {
    display: flex;
    align-items: center;
    gap: 15px;
    margin: 20px auto 30px;
    width: 100%;
    max-width: 700px;
    font-family: var(--font-mono);
}

.progress-bar {
    flex-grow: 1;
    height: 16px;
    background-color: var(--primary-dark-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.4);
}

.progress-bar-fill {
    height: 100%;
    background-image: linear-gradient(90deg, var(--success-color), var(--accent-green));
    border-radius: 8px;
    transition: width 0.5s ease-in-out;
    box-shadow: 0 0 10px var(--success-color);
}

.threat-modeling-board {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 30px;
    margin-top: 20px;
    align-items: flex-start;
}

.system-diagram-panel {
    border: 2px solid var(--border-color);
    padding: 10px;
    border-radius: 12px;
    background: radial-gradient(circle, rgba(18,26,44,0.5) 0%, var(--primary-dark-bg) 70%);
    box-shadow: 0 0 20px rgba(0, 191, 255, 0.15);
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
}
.system-diagram-panel svg {
    max-width: 100%;
    height: auto;
}

.interaction-panel {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    min-height: 450px;
}

.instructions-box {
    background-color: rgba(11, 15, 25, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 25px;
    margin-bottom: 20px;
    text-align: center;
    border-left: 5px solid var(--warning-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}
.instructions-box h3 {
    margin: 0;
    color: var(--warning-color);
    font-size: 1.35em;
    line-height: 1.5;
    text-shadow: 0 0 5px var(--warning-color);
}
.instructions-box .feedback {
    margin-top: 15px;
    font-size: 1.1em;
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: 0;
}

.selected-threat-details {
    text-align: left;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    animation: fadeIn 0.4s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.threat-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.threat-item h4, .selected-threat-details h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.4em;
}

.threat-description {
    font-size: 1.05em;
    margin: 0 0 20px 0;
    line-height: 1.7;
    color: var(--text-secondary);
    flex-grow: 1;
}

.mitigation-options {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}
.mitigation-options h5 {
    font-size: 1.2em;
    color: var(--primary-accent);
    margin-bottom: 15px;
}
.mitigation-options .option-button {
    width: 100%;
    padding: 14px;
    font-size: 1em;
    margin-top: 10px;
}

.threats-selection-tray {
    border-top: 2px solid var(--border-color);
    margin-top: 30px;
    padding-top: 25px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.threat-tray-item {
    background: var(--option-bg);
    padding: 12px 18px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.4);
}
.threat-tray-item:hover:not(.status-mitigated) {
    border-color: var(--primary-accent);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.5), 0 0 10px var(--primary-accent);
}
.threat-tray-item.selected {
    border-color: var(--warning-color);
    box-shadow: 0 0 15px var(--warning-color), 0 3px 8px rgba(0,0,0,0.4);
    background-color: var(--option-hover-bg);
    transform: translateY(-3px) scale(1.02);
}

.threat-tray-item .threat-tray-title {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.05em;
}

.status-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    flex-shrink: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 14px;
    color: var(--primary-dark-bg);
    border: 2px solid var(--primary-dark-bg);
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}
.threat-tray-item.status-unidentified .status-icon {
    background-color: var(--text-muted);
}
.threat-tray-item.status-placed .status-icon {
    background-color: var(--secondary-accent-start);
}
.threat-tray-item.status-mitigated .status-icon {
    background-color: var(--success-color);
}
.threat-tray-item.status-mitigated .status-icon::before {
    content: '✓';
}

.threat-tray-item.status-placed {
    border-color: var(--secondary-accent-start);
}

.threat-tray-item.status-mitigated {
    border-color: var(--success-color);
    background-color: #1c3d2f;
    cursor: default;
    opacity: 0.8;
}
.threat-tray-item.status-mitigated:hover {
    transform: none;
    box-shadow: 0 3px 8px rgba(0,0,0,0.4);
}
.threat-tray-item.status-mitigated .threat-tray-title {
    text-decoration: line-through;
    color: var(--text-muted);
}
.threat-tray-item.status-mitigated .stride-icon {
    opacity: 0.6;
}


.stride-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4em;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.6);
    transition: all 0.2s ease;
}
.stride-icon.spoofing { background-color: #6f42c1; }
.stride-icon.tampering { background-color: #fd7e14; }
.stride-icon.repudiation { background-color: #20c997; }
.stride-icon.information { background-color: #0d6efd; }
.stride-icon.denial { background-color: #dc3545; }
.stride-icon.elevation { background-color: #d63384; }

/* ===== Responsive Design ===== */

/* Tablets and larger phones (~900px and down) */
@media (max-width: 900px) {
    .hero-section {
        padding: 80px 15px;
    }

    .hero-tagline {
        font-size: 1.15rem;
    }

    .threat-modeling-board {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .system-diagram-panel {
      aspect-ratio: 16 / 9;
    }
    
    .interaction-panel {
        min-height: auto;
    }
}

/* Phones and smaller tablets (~768px and down) */
@media (max-width: 768px) {
    #app-container {
        padding: 10px;
    }

    #app-header {
        padding: 20px 0;
    }

    #app-header h1 {
        font-size: 2.2em;
    }
    
    .home-icon-button {
        left: 10px;
        padding: 8px;
    }
    
    .home-icon-button svg {
        width: 30px;
        height: 30px;
    }

    .container {
        padding: 25px 20px;
        margin: 20px 0;
    }

    h2 {
        font-size: 1.6em;
    }
    
    .game-description {
        font-size: 1.05em;
    }

    .start-button, .play-again-button, .next-button, .cta-button {
        padding: 12px 28px;
        font-size: 1.1em;
    }
    
    .incident-container {
        flex-direction: column;
        height: auto;
        gap: 15px;
    }

    .terminal-container {
        height: 350px;
        font-size: 0.95em;
    }

    .threats-selection-tray {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 15px;
    }
    
    .threat-tray-item {
        padding: 10px 15px;
        gap: 10px;
    }
}


/* Small phones (~600px and down) */
@media (max-width: 600px) {
    .container {
        padding: 20px 15px;
    }
    
    #app-header h1 {
        font-size: 1.8em;
    }

    .hero-section h1 {
        font-size: clamp(2rem, 10vw, 2.8rem);
    }
    
    .hero-tagline {
        font-size: 1rem;
    }

    h2 {
        font-size: 1.4em;
        line-height: 1.3;
    }
    
    p {
        font-size: 1em;
    }

    .game-grid,
    .pentest-selection-grid,
    .incident-selection-grid,
    .threat-selection-grid,
    .ctf-challenge-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .game-card,
    .ctf-challenge-card,
    .pentest-card,
    .incident-card,
    .threat-card {
        padding: 15px;
    }

    .game-card-icon {
        width: 40px;
        height: 40px;
        margin-bottom: 10px;
    }

    .game-card h3,
    .ctf-challenge-card h4,
    .pentest-card h3,
    .incident-card h4,
    .threat-card h4 {
        font-size: 1.1em;
    }
    
    .game-card p,
    .ctf-challenge-card p,
    .pentest-objective,
    .incident-card-description,
    .threat-card p {
        font-size: 0.9em;
        margin-bottom: 1em;
        padding-bottom: 0;
    }

    .game-card .play-button,
    .pentest-card .start-button,
    .incident-card .start-button,
    .threat-card .start-button {
        padding: 10px 15px;
        font-size: 0.9em;
    }
    
    .phishing-options {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .phishing-options .option-button {
        width: 80%;
        max-width: 200px;
    }
    
    .welcome-buttons {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .category-tab-button {
        font-size: 1em;
        padding: 8px 12px;
    }

    .threat-modeling-board {
        margin-top: 10px;
    }
    
    .instructions-box {
        padding: 15px;
    }

    .instructions-box h3 {
        font-size: 1.2em;
    }
    
    .threats-selection-tray {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
}