/* ============================================
   SCIENTIFIC ROMANTICISM
   Physics simulation personal site
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Light Mode - Warm Parchment & Blue */
  --bg-primary: #f7f0e0;
  --bg-secondary: #efe8d8;
  --particle-color: #2563eb;
  --particle-glow: rgba(37, 99, 235, 0.3);
  --text-primary: #2b2d42;
  --text-secondary: #5c5f73;
  --text-muted: #8d8fa3;
  --accent: #d4a373;
  --accent-hover: #c4956a;
  --divider: #d4cfc3;

  /* Dial/Slider */
  --dial-bg: linear-gradient(145deg, #e8e3d7, #f7f2e8);
  --dial-border: #c9c4b8;
  --dial-shadow: 0 4px 12px rgba(43, 45, 66, 0.15);
  --dial-track: #d4cfc3;
  --dial-thumb: linear-gradient(145deg, #d4a373, #c08552);
  --dial-thumb-border: #b07a4a;

  /* Effects */
  --noise-opacity: 0.03;
  --scanline-opacity: 0;

  /* Scroll Indicator */
  --scroll-indicator-bg: rgba(247, 240, 224, 0.75);
  --scroll-indicator-border: rgba(212, 200, 180, 0.6);
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Dark Mode - Observatory Night */
    --bg-primary: #1a1a2e;
    --bg-secondary: #16162a;
    --particle-color: #39ff14;
    --particle-glow: rgba(57, 255, 20, 0.4);
    --text-primary: #edf2f4;
    --text-secondary: #a8b2c1;
    --text-muted: #6b7280;
    --accent: #4a4e69;
    --accent-hover: #5c6180;
    --divider: #2d2d4a;

    /* Dial/Slider - Console aesthetic */
    --dial-bg: linear-gradient(145deg, #1f1f38, #151528);
    --dial-border: #2d2d4a;
    --dial-shadow: 0 4px 16px rgba(0, 0, 0, 0.4), 0 0 30px rgba(57, 255, 20, 0.05);
    --dial-track: #2d2d4a;
    --dial-thumb: linear-gradient(145deg, #39ff14, #2ecc0f);
    --dial-thumb-border: #27a80d;

    /* Effects */
    --noise-opacity: 0.02;
    --scanline-opacity: 0.03;

    /* Scroll Indicator */
    --scroll-indicator-bg: rgba(26, 26, 46, 0.8);
    --scroll-indicator-border: rgba(45, 45, 74, 0.7);
  }
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

/* Paper grain texture overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* CRT Scanlines (dark mode only) */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9998;
  opacity: var(--scanline-opacity);
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.3) 2px,
    rgba(0, 0, 0, 0.3) 4px
  );
}

/* --- Typography --- */
h1, h2, h3 {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 600;
  line-height: 1.2;
}

.mono {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* --- Simulation Section --- */
.simulation-section {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Top Left Controls (Social + View Toggle) --- */
.top-left-controls {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  display: flex;
  gap: 0.625rem;
  z-index: 100;
}

.control-btn {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--dial-bg);
  border: 1px solid var(--dial-border);
  border-radius: 50%;
  box-shadow: var(--dial-shadow);
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, color 0.15s ease;
}

.control-btn:hover {
  transform: scale(1.08);
  color: var(--text-primary);
}

@media (hover: hover) {
  /* Only apply active scale on devices with hover (desktop) */
  .control-btn:active {
    transform: scale(0.95);
  }
}

/* On touch devices, skip the transform animation to avoid lag */
@media (hover: none) {
  .control-btn {
    transition: color 0.15s ease;
  }
}

.control-icon {
  width: 20px;
  height: 20px;
}

/* Show atom icon by default (particle view), hide potential icon */
.icon-atom {
  display: block;
}

.icon-potential {
  display: none;
}

/* When in potential view, swap icons */
.control-btn.potential-active .icon-atom {
  display: none;
}

.control-btn.potential-active .icon-potential {
  display: block;
}

/* Shine animation for view toggle hint */
.control-btn.hint-shine {
  position: relative;
  overflow: hidden;
}

.control-btn.hint-shine::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -100%;
  width: 50%;
  height: 200%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  transform: skewX(-20deg);
  animation: hintShine 3s ease-in-out infinite;
  animation-delay: 2s;
  pointer-events: none;
}

@keyframes hintShine {
  0%, 100% {
    left: -100%;
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  40% {
    left: 150%;
    opacity: 1;
  }
  50%, 100% {
    left: 150%;
    opacity: 0;
  }
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .top-left-controls {
    top: 1rem;
    left: 1rem;
    gap: 0.5rem;
  }

  .control-btn {
    width: 36px;
    height: 36px;
  }

  .control-icon {
    width: 18px;
    height: 18px;
  }
}

/* --- Temperature Control --- */
.temperature-control {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  background: var(--dial-bg);
  border: 1px solid var(--dial-border);
  border-radius: 2rem;
  box-shadow: var(--dial-shadow);
  z-index: 100;
}

.temperature-label {
  display: flex;
  align-items: center;
  justify-content: center;
}

.temp-text {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.125rem;
  font-style: italic;
  color: var(--text-secondary);
  user-select: none;
}

.temperature-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 80px;
  height: 6px;
  background: var(--dial-track);
  border-radius: 3px;
  cursor: pointer;
  outline: none;
}

.temperature-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--dial-thumb);
  border: 2px solid var(--dial-thumb-border);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.temperature-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
}

.temperature-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--dial-thumb);
  border: 2px solid var(--dial-thumb-border);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.temperature-slider::-moz-range-thumb:hover {
  transform: scale(1.1);
}

.temp-indicator {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 3rem;
  text-align: right;
  user-select: none;
}

.temp-value {
  color: var(--text-secondary);
}

.temp-unit {
  margin-left: 0.125rem;
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .temperature-control {
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
  }

  .temperature-slider {
    width: 60px;
  }
}

/* --- Scroll Indicator --- */
.scroll-indicator {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  opacity: 0;
  animation: fadeInScroll 0.5s ease-out 0.8s forwards;
  z-index: 100;
  /* Frosted glass backdrop for visibility over particles */
  background: var(--scroll-indicator-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0.5rem 1rem 0.625rem;
  border-radius: 1.25rem;
  border: 1px solid var(--scroll-indicator-border);
}

.scroll-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  text-transform: lowercase;
  color: var(--text-secondary);
}

.scroll-chevron {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
  animation: bounceChevron 2s ease-in-out infinite;
}

@keyframes fadeInScroll {
  to {
    opacity: 1;
  }
}

@keyframes bounceChevron {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(3px);
  }
}

/* --- Wave Divider --- */
.wave-divider {
  width: 100%;
  height: 60px;
  overflow: hidden;
  background: var(--bg-primary);
}

.wave-divider svg {
  width: 100%;
  height: 100%;
}

.wave-path {
  fill: none;
  stroke: var(--divider);
  stroke-width: 1.5;
  stroke-linecap: round;
}

/* --- Journal Section --- */
.journal-section {
  min-height: 100vh;
  padding: 6rem 1.5rem;
  max-width: 42rem;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.journal-heading {
  font-size: 2.5rem;
  font-weight: 400;
  margin-bottom: 3rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.journal-list {
  list-style: none;
}

.journal-entry {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--divider);
}

.journal-entry:first-child {
  border-top: 1px solid var(--divider);
}

.entry-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.entry-title {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  position: relative;
  display: inline-block;
  transition: color 0.2s ease;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.entry-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--particle-color);
  transition: width 0.3s ease;
}

.entry-title:hover {
  color: var(--particle-color);
}

.entry-title:hover::after {
  width: 100%;
}

/* Tablet and up: horizontal layout */
@media (min-width: 640px) {
  .journal-entry {
    flex-direction: row;
    align-items: baseline;
    gap: 2rem;
  }

  .entry-date {
    flex-shrink: 0;
    min-width: 7rem;
  }
}

/* --- Footer --- */
.site-footer {
  padding: 3rem 2rem;
  text-align: center;
  background: var(--bg-secondary);
}

.footer-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}

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

  .scroll-indicator {
    opacity: 1;
    animation: none;
  }

  .scroll-chevron {
    animation: none;
  }
}