/* ===== CSS Reset & Base Styles ===== */
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Fira Code", "IBM Plex Mono", monospace;
}

:root {
  --bg-primary: #0a0e27;
  --bg-secondary: #1a1f3a;
  --bg-terminal: #0d1117;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --accent-green: #39ff14;
  --accent-yellow: #ffd700;
  --accent-cyan: #00f5ff;
  --accent-red: #ff3366;
  --accent-purple: #bd93f9;
  --border-color: #30363d;
  --shadow: rgba(0, 0, 0, 0.5);
}

html {
  scroll-behavior: smooth;
}

body {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 300;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

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

/* ===== Accessibility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

.input-command:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent-green);
}

#welcome-heading {
  font-size: inherit;
  font-weight: inherit;
}

/* ===== Loading Screen ===== */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--accent-green);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-text {
  margin-top: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ===== Main Container ===== */
.main-container {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0;
  background: var(--bg-terminal);
  border-radius: 12px;
  box-shadow: 0 20px 60px var(--shadow);
  border: 1px solid var(--border-color);
  overflow: hidden;
  animation: slideIn 0.6s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Terminal Header ===== */
.terminal-header {
  background: var(--bg-secondary);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.terminal-buttons {
  display: flex;
  gap: 8px;
}

.terminal-button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s;
}

.terminal-button:hover {
  transform: scale(1.2);
}

.terminal-button.close {
  background: #ff5f56;
}

.terminal-button.minimize {
  background: #ffbd2e;
}

.terminal-button.maximize {
  background: #27c93f;
}

.terminal-title {
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  flex: 1;
  text-align: center;
}

/* ===== ASCII Name Banner ===== */
.ascii-name {
  color: var(--accent-yellow);
  font-size: clamp(0.3rem, 1.2vw, 0.65rem);
  margin: 20px;
  padding: 15px;
  background: rgba(255, 215, 0, 0.03);
  border-left: 3px solid var(--accent-yellow);
  overflow-x: auto;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from {
    text-shadow: 0 0 5px var(--accent-yellow);
  }
  to {
    text-shadow: 0 0 20px var(--accent-yellow), 0 0 30px var(--accent-yellow);
  }
}

/* ===== Introduction Section ===== */
.introduction {
  padding: 20px;
  margin-bottom: 10px;
}

.message-text {
  font-size: clamp(14px, 2vw, 16px);
  font-weight: 300;
  margin: 15px 0;
  color: var(--text-primary);
}

.wave {
  display: inline-block;
  animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(20deg); }
  75% { transform: rotate(-20deg); }
}

.fade-in {
  animation: fadeIn 0.8s ease-in;
}

.fade-in-delay {
  animation: fadeIn 1.2s ease-in;
}

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

.help-text {
  font-size: 17px;
  font-weight: 500;
  color: var(--accent-green);
  padding: 2px 6px;
  background: rgba(57, 255, 20, 0.1);
  border-radius: 3px;
}

/* ===== Command Output ===== */
#command-output {
  padding: 0 20px;
  min-height: 100px;
  max-height: 500px;
  overflow-y: auto;
}

#command-output::-webkit-scrollbar {
  width: 8px;
}

#command-output::-webkit-scrollbar-track {
  background: var(--bg-terminal);
}

#command-output::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

#command-output::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

.command-result {
  margin: 15px 0;
  padding: 10px;
  background: rgba(255, 255, 255, 0.02);
  border-left: 2px solid var(--accent-cyan);
  border-radius: 4px;
  animation: slideInLeft 0.3s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== Input Container ===== */
.input-container {
  display: flex;
  align-items: center;
  padding: 20px;
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid var(--border-color);
  gap: 10px;
}

.input-label {
  color: var(--accent-green);
  font-weight: 500;
  white-space: nowrap;
  font-size: clamp(12px, 2vw, 14px);
}

.prompt-user {
  color: var(--accent-cyan);
}

.prompt-host {
  color: var(--accent-yellow);
}

.prompt-path {
  color: var(--accent-purple);
}

.input-command {
  flex: 1;
  padding: 8px 12px;
  border: none;
  outline: none;
  background-color: transparent;
  color: var(--text-primary);
  font-weight: 400;
  font-size: clamp(14px, 2vw, 16px);
  font-family: inherit;
  cursor: text;
}

.input-command::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.input-text {
  color: var(--accent-green);
}

/* ===== Command Styles ===== */
.command-not-found {
  font-size: 16px;
  color: var(--accent-red);
  font-weight: 500;
}

.data-dt {
  font-size: clamp(15px, 2vw, 17px);
  font-weight: 600;
  margin-top: 12px;
  color: var(--accent-yellow);
  display: inline-block;
}

.data-dd {
  margin: 5px 0 5px 20px;
  color: var(--text-primary);
  word-break: break-word;
}

.data-li {
  list-style-type: square;
  list-style-position: inside;
  font-weight: 400;
  margin: 8px 0;
  padding-left: 10px;
  color: var(--text-primary);
  transition: color 0.2s;
}

.data-li:hover {
  color: var(--accent-cyan);
}

.about-text {
  font-weight: 400;
  line-height: 1.8;
  color: var(--text-primary);
}

/* ===== Table Styles ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  overflow-x: auto;
  display: block;
}

.data-name-th {
  text-align: left;
  padding: 12px 15px 12px 0;
  font-weight: 600;
  min-width: 200px;
}

.data-description-td {
  padding: 12px 0;
  vertical-align: top;
  padding-left: 20px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.data-link {
  color: var(--accent-yellow);
  text-decoration: none;
  cursor: pointer;
  position: relative;
  transition: color 0.3s;
  display: inline-block;
}

.data-link:hover {
  color: var(--accent-cyan);
}

.data-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -2px;
  left: 0;
  background: var(--accent-cyan);
  transition: width 0.3s ease;
}

.data-link:hover::after {
  width: 100%;
}

/* ===== Mobile Help Button ===== */
.mobile-help-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent-green);
  color: var(--bg-primary);
  border: none;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(57, 255, 20, 0.4);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: transform 0.3s, box-shadow 0.3s;
}

.mobile-help-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(57, 255, 20, 0.6);
}

.mobile-help-btn:active {
  transform: scale(0.95);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  .main-container {
    margin: 10px;
    border-radius: 8px;
  }

  .terminal-header {
    padding: 10px 15px;
  }

  .terminal-title {
    font-size: 10px;
  }

  .ascii-name {
    font-size: clamp(0.25rem, 2vw, 0.5rem);
    margin: 10px;
    padding: 10px;
  }

  .introduction {
    padding: 15px;
  }

  #command-output {
    padding: 0 15px;
    max-height: 400px;
  }

  .input-container {
    padding: 15px;
    flex-wrap: wrap;
  }

  .input-label {
    font-size: 12px;
  }

  .data-table {
    font-size: 14px;
  }

  .data-name-th {
    min-width: 150px;
    padding-right: 10px;
  }

  .data-description-td {
    padding-left: 10px;
    font-size: 13px;
  }

  .mobile-help-btn {
    display: flex;
  }
}

@media (max-width: 480px) {
  .main-container {
    margin: 5px;
    border-radius: 6px;
  }

  .terminal-buttons {
    gap: 6px;
  }

  .terminal-button {
    width: 10px;
    height: 10px;
  }

  .ascii-name {
    font-size: 0.32rem;
    padding: 8px;
  }

  .message-text {
    font-size: 13px;
  }

  .help-text {
    font-size: 14px;
  }

  .input-container {
    padding: 12px;
  }

  .input-command {
    font-size: 14px;
  }

  .data-table {
    display: block;
    overflow-x: auto;
  }

  .data-name-th,
  .data-description-td {
    display: block;
    width: 100%;
    padding: 8px 0;
  }

  .data-description-td {
    padding-left: 0;
    border-top: 1px solid var(--border-color);
    margin-top: 5px;
  }

  .mobile-help-btn {
    width: 45px;
    height: 45px;
    bottom: 20px;
    right: 20px;
    font-size: 20px;
  }
}

/* ===== Print Styles ===== */
@media print {
  .loading-screen,
  .terminal-header,
  .input-container,
  .mobile-help-btn {
    display: none;
  }

  .main-container {
    box-shadow: none;
    border: 1px solid #000;
  }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== Additional Utility Classes ===== */
.hidden {
  display: none;
}

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

.mt-10 {
  margin-top: 10px;
}

.mb-10 {
  margin-bottom: 10px;
}

/* ===== Skills Grid ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 15px;
  margin: 15px 0;
}

.skill-item {
  background: rgba(57, 255, 20, 0.05);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-green);
  padding: 12px 15px;
  border-radius: 6px;
  color: var(--text-primary);
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: default;
}

.skill-item:hover {
  background: rgba(57, 255, 20, 0.1);
  border-left-color: var(--accent-cyan);
  transform: translateX(5px);
}

@media (max-width: 768px) {
  .skills-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
  }
  
  .skill-item {
    padding: 10px 12px;
    font-size: 14px;
  }
}

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

/* ===== Performance Optimizations ===== */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* GPU Acceleration for animations */
.spinner,
.mobile-help-btn,
.terminal-button,
.skill-item {
  will-change: transform;
}

/* Optimize font rendering */
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ===== Command Auto-complete Suggestions ===== */
.autocomplete-suggestions {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px 6px 0 0;
  max-height: 200px;
  overflow-y: auto;
  display: none;
  z-index: 100;
}

.autocomplete-suggestions.show {
  display: block;
}

.autocomplete-item {
  padding: 10px 15px;
  cursor: pointer;
  transition: background 0.2s;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.autocomplete-item:hover,
.autocomplete-item.active {
  background: rgba(57, 255, 20, 0.1);
  color: var(--accent-green);
}

.autocomplete-item:last-child {
  border-bottom: none;
}

/* ===== Enhanced Scrollbar ===== */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) var(--bg-terminal);
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: var(--bg-terminal);
  border-radius: 5px;
}

*::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
  border: 2px solid var(--bg-terminal);
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--accent-green);
}

/* ===== Theme Toggle (Future Enhancement) ===== */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  transition: all 0.3s ease;
  color: var(--accent-yellow);
  font-size: 20px;
}

.theme-toggle:hover {
  background: var(--accent-green);
  color: var(--bg-primary);
  transform: rotate(180deg);
}

/* ===== Improved Typography ===== */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  margin-bottom: 0.5em;
}

p {
  margin-bottom: 1em;
}

code {
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  color: var(--accent-cyan);
}

/* ===== Loading State Enhancement ===== */
.command-loading {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  margin-left: 10px;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ===== Error State Enhancement ===== */
.error-message {
  background: rgba(255, 51, 102, 0.1);
  border-left: 3px solid var(--accent-red);
  padding: 15px;
  border-radius: 6px;
  margin: 10px 0;
}

/* ===== Success State ===== */
.success-message {
  background: rgba(57, 255, 20, 0.1);
  border-left: 3px solid var(--accent-green);
  padding: 15px;
  border-radius: 6px;
  margin: 10px 0;
}

/* ===== Info State ===== */
.info-message {
  background: rgba(0, 245, 255, 0.1);
  border-left: 3px solid var(--accent-cyan);
  padding: 15px;
  border-radius: 6px;
  margin: 10px 0;
}