/* ================================================
 *  Cyber Terminal Portfolio - Optimized CSS
 *  Version: 2.0
 *  Author: AI Enhanced
 *  Description: Modern terminal-style portfolio with
 *               cyberpunk aesthetics and performance
 *               optimizations
 * ================================================ */

/* ============================
 * CSS RESET & CUSTOM PROPERTIES
 * ============================ */
:root {
  /* Color Palette */
  --dark-bg: #0a0a0a;
  --terminal-bg: #1a1a1a;
  --text-color: #e0e0e0;
  --primary-color: #00aaff;
  --glow-color: rgba(0, 170, 255, 0.75);
  --border-color: #333;
  --hover-glow: rgba(0, 170, 255, 0.9);
  
  /* Typography */
  --sans-font: 'Noto Sans SC', sans-serif;
  --mono-font: 'Source Code Pro', monospace;
  
  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 5rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px var(--glow-color);
  --shadow-intense: 0 0 50px var(--glow-color);
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Z-index Scale */
  --z-negative: -1;
  --z-normal: 1;
  --z-tooltip: 10;
  --z-fixed: 100;
  --z-modal: 1000;
  --z-cursor: 9999;
  --z-modal-backdrop: 10000;
}

/* ============================
 * RESET & BASE STYLES
 * ============================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--dark-bg);
  color: var(--text-color);
  font-family: var(--sans-font);
  line-height: 1.8;
  overflow-x: hidden;
  cursor: auto;
}

/* ============================
 * REUSABLE UTILITIES
 * ============================ */
.glow-effect {
  transition: var(--transition-normal);
  will-change: transform, box-shadow;
}

.glow-effect:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

.text-gradient {
  background: linear-gradient(45deg, #fff, var(--primary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================
 * CURSOR FOLLOWER
 * ============================ */
.cursor-follower {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 170, 255, 0.8) 0%, rgba(0, 170, 255, 0.2) 70%, transparent 100%);
  pointer-events: none;
  z-index: var(--z-cursor);
  transform: translate(-50%, -50%);
  transition: width var(--transition-normal), height var(--transition-normal), background var(--transition-normal);
  mix-blend-mode: screen;
  will-change: transform;
}

.cursor-follower::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 170, 255, 0.4) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: translate(-50%, -50%) scale(0.8); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
}

body:hover .cursor-follower {
  width: 25px;
  height: 25px;
  background: radial-gradient(circle, rgba(0, 170, 255, 1) 0%, rgba(0, 170, 255, 0.4) 70%, transparent 100%);
}

/* ============================
 * PARTICLES BACKGROUND
 * ============================ */
#particles-js {
  position: fixed;
  inset: 0;
  z-index: var(--z-negative);
  transition: transform var(--transition-fast);
  will-change: transform;
}

/* ============================
 * LAYOUT COMPONENTS
 * ============================ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-xxl) var(--space-lg);
}

/* ============================
 * TYPOGRAPHY
 * ============================ */
h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-xl);
  text-align: center;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

h3 {
  font-size: clamp(1.5rem, 4vw, 1.8rem);
  color: #fff;
  margin-bottom: var(--space-md);
  font-weight: 600;
}

p {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
  position: relative;
}

a:hover {
  color: #fff;
  text-shadow: 0 0 5px var(--glow-color);
}

/* ============================
 * HERO SECTION & TERMINAL
 * ============================ */
#hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm);
}

.terminal {
  width: 100%;
  max-width: 720px;
  background: var(--terminal-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-medium), var(--shadow-intense);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.terminal:hover {
  box-shadow: var(--shadow-medium), 0 0 70px var(--glow-color);
}

.terminal-header {
  background: #333;
  padding: var(--space-xs);
  display: flex;
  align-items: center;
  position: relative;
}

.terminal-buttons {
  display: flex;
  gap: var(--space-xs);
}

.terminal-button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

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

.terminal-button.red { background: #ff5f56; }
.terminal-button.yellow { background: #ffbd2e; }
.terminal-button.green { background: #27c93f; }

.terminal-title {
  color: #ccc;
  font-family: var(--mono-font);
  font-size: 0.9rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.terminal-body {
  padding: var(--space-lg);
  font-family: var(--mono-font);
  font-size: 1.1rem;
  min-height: 250px;
}

#terminal-content span.cursor {
  display: inline-block;
  background: var(--primary-color);
  width: 10px;
  animation: blink 1s infinite;
}

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

/* ============================
 * SECTIONS
 * ============================ */
section {
  background: rgba(10, 10, 10, 0.8);
  border-top: 1px solid var(--border-color);
  position: relative;
  z-index: var(--z-normal);
}

/* Philosophy Section */
#philosophy {
  text-align: center;
}

.reflection {
  max-width: 800px;
  margin: var(--space-xl) auto 0;
  text-align: center;
}

/* ============================
 * TIMELINE COMPONENT
 * ============================ */
.timeline {
  position: relative;
  margin-top: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 100%;
  background: var(--border-color);
  box-shadow: 0 0 10px var(--glow-color);
}

.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xxl);
  width: 100%;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  width: calc(50% - 200px);
  background: var(--terminal-bg);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  will-change: transform, box-shadow;
}

.timeline-content:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

.timeline-content::before {
  content: '';
  position: absolute;
  top: 30px;
  width: 0;
  height: 0;
  border-style: solid;
}

.timeline-content.left::before {
  right: -15px;
  border-width: 15px 0 15px 15px;
  border-color: transparent transparent transparent var(--border-color);
}

.timeline-content.right::before {
  left: -15px;
  border-width: 15px 15px 15px 0;
  border-color: transparent var(--border-color) transparent transparent;
}

.timeline-icon {
  width: 380px;
  height: 285px;
  border-radius: var(--radius-lg);
  background: var(--dark-bg);
  border: 3px solid var(--primary-color);
  overflow: hidden;
  box-shadow: var(--shadow-intense);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  will-change: transform, box-shadow;
}

.timeline-icon:hover {
  transform: scale(1.03);
  box-shadow: 0 0 70px var(--glow-color);
}

.timeline-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
  will-change: transform;
}

.timeline-icon:hover img {
  transform: scale(1.05);
}

/* ============================
 * HOBBIES GRID
 * ============================ */
.hobby-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.hobby-card {
  background: var(--terminal-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--border-color);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  will-change: transform, box-shadow;
}

.hobby-card:hover {
  transform: translateY(-15px);
  box-shadow: var(--shadow-intense);
}

.hobby-card img {
  width: 100%;
  height: 350px;
  object-fit: cover;
  transition: transform var(--transition-normal);
  will-change: transform;
}

.hobby-card:hover img {
  transform: scale(1.02);
}

.hobby-card-content {
  padding: var(--space-lg);
}

/* ============================
 * SKILLS SECTION
 * ============================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.skill-category {
  background: var(--terminal-bg);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-normal);
}

.skill-category:hover {
  box-shadow: 0 0 15px rgba(0, 170, 255, 0.5);
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  margin-bottom: var(--space-xs);
  position: relative;
  padding-left: 20px;
}

.skill-category li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-family: var(--mono-font);
}

/* ============================
 * THINK DIFFERENT SECTION
 * ============================ */
.think-different-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin: var(--space-xl) auto;
  text-align: left;
}

.think-different-text p {
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: 1em;
}

.think-different-text.english {
  font-style: italic;
  color: #ccc;
}

.think-different-text.chinese {
  color: var(--text-color);
}

/* ============================
 * MODAL COMPONENT
 * ============================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  transition: opacity var(--transition-normal);
}

.modal-content {
  background: var(--terminal-bg);
  margin: 5% auto;
  padding: var(--space-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 80%;
  max-width: 600px;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: var(--shadow-intense);
  position: relative;
}

.close-modal {
  color: var(--primary-color);
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.close-modal:hover {
  color: #fff;
}

.modal-body {
  color: var(--text-color);
  line-height: 1.8;
  font-family: var(--sans-font);
}

/* ============================
 * FOOTER
 * ============================ */
footer {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background: var(--terminal-bg);
}

.callsign {
  font-family: var(--mono-font);
  font-size: 1.5rem;
  color: var(--primary-color);
  letter-spacing: 3px;
  margin: var(--space-md) 0;
}

.final-quote {
  font-style: italic;
  color: #888;
}

/* ============================
 * ANIMATIONS
 * ============================ */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

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

/* Large desktops */
@media (min-width: 1400px) {
  .timeline-icon {
    width: 450px;
    height: 337px;
  }
  
  .timeline-content {
    width: calc(50% - 250px);
  }
}

/* Desktop and tablets */
@media (max-width: 1200px) {
  .timeline-icon {
    width: 320px;
    height: 240px;
  }
  
  .timeline-content {
    width: calc(50% - 180px);
  }
}

/* Tablet layout */
@media (max-width: 1024px) {
  :root {
    --space-xxl: 3rem;
    --space-lg: 1.5rem;
  }
  
  .timeline::before {
    left: 40px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: var(--space-xl);
    padding-left: 80px;
  }

  .timeline-icon {
    position: relative;
    left: 0;
    margin-bottom: var(--space-lg);
    width: 100%;
    max-width: 500px;
    height: 375px;
  }

  .timeline-content {
    width: 100%;
    max-width: 600px;
    padding: var(--space-lg);
  }
  
  .timeline-content::before {
    display: none;
  }
  
  .hobby-grid {
    gap: var(--space-lg);
  }
  
  .hobby-card img {
    height: 300px;
  }
}

/* Small tablets */
@media (max-width: 768px) {
  .container {
    padding: var(--space-lg) var(--space-md);
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    padding-left: 50px;
  }

  .timeline-icon {
    max-width: 100%;
    height: 280px;
  }

  .hobby-grid,
  .think-different-container {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .hobby-card img {
    height: 280px;
  }
}

/* Mobile phones */
@media (max-width: 480px) {
  :root {
    --space-xxl: 2rem;
    --space-lg: 1rem;
  }
  
  .container {
    padding: var(--space-lg) var(--space-sm);
  }

  .timeline::before {
    left: 15px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    padding-left: 30px;
  }

  .timeline-icon {
    height: 220px;
    border-radius: var(--radius-md);
  }
  
  .timeline-content {
    padding: var(--space-md);
  }

  .hobby-card img {
    height: 220px;
  }
  
  h2 {
    font-size: clamp(1.8rem, 6vw, 2.5rem);
  }
  
  .terminal-body {
    padding: var(--space-md);
    font-size: 1rem;
  }
}

/* Very small devices */
@media (max-width: 375px) {
  .timeline-icon {
    height: 180px;
  }
  
  .hobby-card img {
    height: 180px;
  }
}

/* ============================
 * BROWSER COMPATIBILITY
 * ============================ */

/* Fallback for aspect-ratio */
@supports not (aspect-ratio: 1 / 1) {
  .timeline-icon {
    height: 285px;
  }
}

/* IE11 compatibility */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  .timeline-icon,
  .hobby-card img {
    width: 100%;
  }
  
  .timeline-content,
  .timeline-item {
    display: block;
  }
  
  .timeline-item {
    margin-bottom: var(--space-lg);
  }
  
  .timeline-icon {
    margin-bottom: var(--space-lg);
  }
}

/* Safari compatibility */
@supports (-webkit-appearance: none) {
  .timeline-icon,
  .hobby-card {
    -webkit-backface-visibility: hidden;
    -webkit-transform: translateZ(0);
  }
}

/* ============================
 * PRINT STYLES
 * ============================ */
@media print {
  * {
    -webkit-print-color-adjust: exact !important;
    color-adjust: exact !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .cursor-follower,
  #particles-js {
    display: none;
  }
  
  .timeline-icon,
  .hobby-card img,
  .timeline-item,
  .hobby-card {
    page-break-inside: avoid;
    break-inside: avoid;
  }
}

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