/**
 * Xentauri Thinking Indicator - CSS
 * Optimized for Raspberry Pi + Chromium
 *
 * Optimizations:
 * - GPU-accelerated transforms (translate, scale, opacity)
 * - Reduced box-shadow usage (expensive on Pi)
 * - will-change hints for critical animations
 * - Simplified particle system
 * - CSS variables for easy theming
 */

/* ============================================================================
   CSS VARIABLES
   ============================================================================ */

:root {
  /* Base colors */
  --xti-bg: hsl(230, 25%, 7%);
  --xti-fg: hsl(210, 40%, 98%);
  --xti-card-bg: hsla(230, 25%, 10%, 0.85);
  --xti-muted: hsl(230, 20%, 18%);
  --xti-muted-fg: hsl(215, 20%, 65%);
  --xti-border: hsl(230, 20%, 20%);
  --xti-destructive: hsl(0, 84%, 60%);

  /* Phase colors */
  --xti-cyan: hsl(190, 100%, 50%);
  --xti-purple: hsl(252, 76%, 60%);
  --xti-green: hsl(152, 100%, 50%);
  --xti-orange: hsl(32, 100%, 50%);

  /* Current phase color (updated via JS class) */
  --xti-phase-color: var(--xti-cyan);
  --xti-phase-color-rgb: 0, 200, 255;

  /* Timing */
  --xti-transition-fast: 150ms;
  --xti-transition-normal: 300ms;
  --xti-transition-slow: 500ms;

  /* ==========================================
     RESPONSIVE SCALE VARIABLES (TV optimized)
     ========================================== */
  --xti-scale: 1;
  --xti-container-width: 420px;
  --xti-card-padding: 1.5rem;
  --xti-mascot-size: 120px;
  --xti-glow-size: 140px;
  --xti-mascot-section-height: 140px;
  --xti-message-font-size: 1.125rem;
  --xti-message-line-height: 1.5;
  --xti-lang-font-size: 0.75rem;
  --xti-progress-height: 8px;
  --xti-tip-font-size: 0.875rem;
  --xti-tip-icon-size: 16px;
  --xti-time-font-size: 0.875rem;
  --xti-dot-size: 6px;
  --xti-particle-size: 4px;
  --xti-cancel-font-size: 0.875rem;
  --xti-cancel-padding: 0.375rem 0.75rem;
}

/* ============================================================================
   FULLSCREEN OVERLAY
   ============================================================================ */

.xti-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--xti-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity var(--xti-transition-slow) ease-out;
}

.xti-overlay.xti-hidden {
  opacity: 0;
  pointer-events: none;
}

/* ============================================================================
   CONTAINER & CARD
   ============================================================================ */

.xti-container {
  width: 100%;
  max-width: var(--xti-container-width);
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--xti-transition-slow) ease-out,
              transform var(--xti-transition-slow) ease-out;
  will-change: opacity, transform;
}

.xti-container.xti-hidden {
  opacity: 0;
  transform: translateY(20px);
}

.xti-container.xti-visible {
  opacity: 1;
  transform: translateY(0);
}

.xti-card {
  position: relative;
  overflow: hidden;
  padding: var(--xti-card-padding);
  border-radius: calc(1rem * var(--xti-scale));
  border: 1px solid var(--xti-border);
  background: var(--xti-card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color var(--xti-transition-normal) ease;
}

/* Glow effect using pseudo-element (more efficient than box-shadow animation) */
.xti-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: radial-gradient(
    ellipse at center,
    rgba(var(--xti-phase-color-rgb), 0.3) 0%,
    transparent 70%
  );
  opacity: 0.5;
  z-index: -1;
  transition: opacity var(--xti-transition-slow) ease;
  will-change: opacity;
}

/* Phase-specific colors */
.xti-phase-preparing {
  --xti-phase-color: var(--xti-cyan);
  --xti-phase-color-rgb: 0, 200, 255;
  --xti-gradient-from: var(--xti-cyan);
  --xti-gradient-to: var(--xti-purple);
}

.xti-phase-analyzing {
  --xti-phase-color: var(--xti-purple);
  --xti-phase-color-rgb: 124, 92, 239;
  --xti-gradient-from: var(--xti-purple);
  --xti-gradient-to: var(--xti-cyan);
}

.xti-phase-designing {
  --xti-phase-color: var(--xti-green);
  --xti-phase-color-rgb: 0, 255, 128;
  --xti-gradient-from: var(--xti-green);
  --xti-gradient-to: var(--xti-cyan);
}

/* ============================================================================
   PARTICLES (Reduced for Pi performance)
   ============================================================================ */

.xti-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.xti-particle {
  position: absolute;
  width: var(--xti-particle-size);
  height: var(--xti-particle-size);
  border-radius: 50%;
  background: var(--xti-phase-color);
  opacity: 0;
  transform: scale(0.5);
  animation: xti-particle-pulse var(--duration, 3s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  will-change: opacity, transform;
}

@keyframes xti-particle-pulse {
  0%, 100% {
    opacity: 0;
    transform: scale(0.5);
  }
  50% {
    opacity: 0.8;
    transform: scale(1);
  }
}

/* ============================================================================
   MASCOT SECTION
   ============================================================================ */

.xti-mascot-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: calc(1.25rem * var(--xti-scale));
  position: relative;
  height: var(--xti-mascot-section-height);
}

.xti-glow-ring {
  position: absolute;
  width: var(--xti-glow-size);
  height: var(--xti-glow-size);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(var(--xti-phase-color-rgb), 0.2) 0%,
    transparent 70%
  );
  animation: xti-glow-pulse 2s ease-in-out infinite;
  will-change: opacity, transform;
}

@keyframes xti-glow-pulse {
  0%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.15);
  }
}

.xti-mascot-container {
  position: relative;
  z-index: 10;
  transition: transform var(--xti-transition-fast) ease-out;
}

.xti-mascot-container.xti-phase-bounce {
  animation: xti-bounce 0.3s ease-out;
}

@keyframes xti-bounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.xti-mascot-float {
  animation: xti-float 3s ease-in-out infinite;
  will-change: transform;
}

@keyframes xti-float {
  0%, 100% { transform: translateY(calc(-8px * var(--xti-scale))); }
  50% { transform: translateY(calc(8px * var(--xti-scale))); }
}

.xti-mascot-image {
  width: var(--xti-mascot-size);
  height: var(--xti-mascot-size);
  object-fit: contain;
}

.xti-mascot-float svg {
  width: var(--xti-mascot-size);
  height: var(--xti-mascot-size);
}

/* ============================================================================
   MESSAGE SECTION
   ============================================================================ */

.xti-message-section {
  text-align: center;
  margin-bottom: calc(1rem * var(--xti-scale));
  min-height: calc(60px * var(--xti-scale));
}

.xti-message-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(0.25rem * var(--xti-scale));
}

.xti-message-text {
  color: var(--xti-fg);
  font-weight: 500;
  font-size: var(--xti-message-font-size);
  line-height: var(--xti-message-line-height);
  margin: 0;
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--xti-transition-fast) ease,
              transform var(--xti-transition-fast) ease;
}

.xti-message-text.xti-fade-out {
  opacity: 0;
  transform: translateY(-10px);
}

.xti-message-lang {
  font-size: var(--xti-lang-font-size);
  color: var(--xti-muted-fg);
  background: hsla(230, 20%, 18%, 0.5);
  padding: calc(0.125rem * var(--xti-scale)) calc(0.5rem * var(--xti-scale));
  border-radius: calc(0.25rem * var(--xti-scale));
  opacity: 1;
  transition: opacity var(--xti-transition-fast) ease;
}

.xti-message-lang.xti-fade-out {
  opacity: 0;
}

/* ============================================================================
   PROGRESS BAR
   ============================================================================ */

.xti-progress-section {
  margin-bottom: calc(1rem * var(--xti-scale));
}

.xti-progress-track {
  height: var(--xti-progress-height);
  background: hsla(230, 20%, 18%, 0.5);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.xti-progress-bar {
  height: 100%;
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--xti-gradient-from),
    var(--xti-gradient-to)
  );
  width: 0%;
  transition: width 0.3s ease-out;
  will-change: width;
}

.xti-progress-shimmer {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    to right,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  animation: xti-shimmer 1.5s linear infinite;
  will-change: transform;
}

@keyframes xti-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(300%); }
}

.xti-progress-label {
  display: flex;
  justify-content: space-between;
  margin-top: calc(0.25rem * var(--xti-scale));
}

.xti-progress-label span {
  font-size: var(--xti-lang-font-size);
  color: var(--xti-muted-fg);
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.xti-footer {
  display: flex;
  align-items: center;
  justify-content: center;
}

.xti-footer-left {
  display: flex;
  align-items: center;
  gap: calc(0.75rem * var(--xti-scale));
}

/* Loading dots */
.xti-dots {
  display: flex;
  align-items: center;
  gap: calc(4px * var(--xti-scale));
}

.xti-dot {
  width: var(--xti-dot-size);
  height: var(--xti-dot-size);
  border-radius: 50%;
  background: var(--xti-phase-color);
  animation: xti-dot-pulse 0.8s ease-in-out infinite;
  animation-delay: var(--dot-delay, 0s);
  will-change: opacity, transform;
}

@keyframes xti-dot-pulse {
  0%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  50% {
    opacity: 1;
    transform: scale(1.2);
  }
}

/* Speed up dots in later phases */
.xti-phase-designing .xti-dot {
  animation-duration: 0.5s;
}

/* Time */
.xti-time {
  font-size: var(--xti-time-font-size);
  color: var(--xti-muted-fg);
  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
}

/* ============================================================================
   PERFORMANCE HINTS
   ============================================================================ */

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  .xti-mascot-float,
  .xti-glow-ring,
  .xti-particle,
  .xti-dot,
  .xti-progress-shimmer {
    animation: none;
  }

  .xti-mascot-float {
    transform: none;
  }

  .xti-glow-ring {
    opacity: 0.5;
  }

  .xti-particle {
    opacity: 0.5;
    transform: scale(1);
  }

  .xti-dot {
    opacity: 1;
    transform: scale(1);
  }
}

/* Low performance mode - add class 'xti-low-perf' to container */
.xti-low-perf .xti-particles,
.xti-low-perf .xti-progress-shimmer,
.xti-low-perf .xti-card::before {
  display: none;
}

.xti-low-perf .xti-glow-ring {
  animation: none;
  opacity: 0.4;
}

/* ============================================================================
   TV / LARGE SCREEN BREAKPOINTS
   Optimized for viewing distance of ~3 meters
   ============================================================================ */

/* HD Ready (1280x720) */
@media (min-width: 1280px) and (min-height: 720px) {
  :root {
    --xti-scale: 1.5;
    --xti-container-width: 600px;
    --xti-card-padding: 2rem;
    --xti-mascot-size: 180px;
    --xti-glow-size: 210px;
    --xti-mascot-section-height: 210px;
    --xti-message-font-size: 1.5rem;
    --xti-lang-font-size: 1rem;
    --xti-progress-height: 12px;
    --xti-tip-font-size: 1.125rem;
    --xti-tip-icon-size: 24px;
    --xti-time-font-size: 1.125rem;
    --xti-dot-size: 10px;
    --xti-particle-size: 6px;
    --xti-cancel-font-size: 1.125rem;
    --xti-cancel-padding: 0.5rem 1rem;
  }
}

/* Full HD (1920x1080) - Most common TV resolution */
@media (min-width: 1920px) and (min-height: 1080px) {
  :root {
    --xti-scale: 2;
    --xti-container-width: 800px;
    --xti-card-padding: 2.5rem;
    --xti-mascot-size: 240px;
    --xti-glow-size: 280px;
    --xti-mascot-section-height: 280px;
    --xti-message-font-size: 2rem;
    --xti-lang-font-size: 1.25rem;
    --xti-progress-height: 16px;
    --xti-tip-font-size: 1.5rem;
    --xti-tip-icon-size: 32px;
    --xti-time-font-size: 1.5rem;
    --xti-dot-size: 12px;
    --xti-particle-size: 8px;
    --xti-cancel-font-size: 1.5rem;
    --xti-cancel-padding: 0.75rem 1.5rem;
  }
}

/* QHD / 1440p */
@media (min-width: 2560px) and (min-height: 1440px) {
  :root {
    --xti-scale: 2.5;
    --xti-container-width: 1000px;
    --xti-card-padding: 3rem;
    --xti-mascot-size: 300px;
    --xti-glow-size: 350px;
    --xti-mascot-section-height: 350px;
    --xti-message-font-size: 2.5rem;
    --xti-lang-font-size: 1.5rem;
    --xti-progress-height: 20px;
    --xti-tip-font-size: 1.75rem;
    --xti-tip-icon-size: 40px;
    --xti-time-font-size: 1.75rem;
    --xti-dot-size: 16px;
    --xti-particle-size: 10px;
    --xti-cancel-font-size: 1.75rem;
    --xti-cancel-padding: 1rem 2rem;
  }
}

/* 4K UHD (3840x2160) */
@media (min-width: 3840px) and (min-height: 2160px) {
  :root {
    --xti-scale: 3.5;
    --xti-container-width: 1400px;
    --xti-card-padding: 4rem;
    --xti-mascot-size: 420px;
    --xti-glow-size: 490px;
    --xti-mascot-section-height: 490px;
    --xti-message-font-size: 3.5rem;
    --xti-lang-font-size: 2rem;
    --xti-progress-height: 28px;
    --xti-tip-font-size: 2.25rem;
    --xti-tip-icon-size: 56px;
    --xti-time-font-size: 2.25rem;
    --xti-dot-size: 22px;
    --xti-particle-size: 14px;
    --xti-cancel-font-size: 2.25rem;
    --xti-cancel-padding: 1.25rem 2.5rem;
  }
}

/* ============================================================================
   TV MODE CLASS (Alternative to media queries)
   Add class to html element: <html class="xti-tv-1080p">
   ============================================================================ */

.xti-tv-720p {
  --xti-scale: 1.5;
  --xti-container-width: 600px;
  --xti-card-padding: 2rem;
  --xti-mascot-size: 180px;
  --xti-glow-size: 210px;
  --xti-mascot-section-height: 210px;
  --xti-message-font-size: 1.5rem;
  --xti-lang-font-size: 1rem;
  --xti-progress-height: 12px;
  --xti-tip-font-size: 1.125rem;
  --xti-tip-icon-size: 24px;
  --xti-time-font-size: 1.125rem;
  --xti-dot-size: 10px;
  --xti-particle-size: 6px;
  --xti-cancel-font-size: 1.125rem;
  --xti-cancel-padding: 0.5rem 1rem;
}

.xti-tv-1080p {
  --xti-scale: 2;
  --xti-container-width: 800px;
  --xti-card-padding: 2.5rem;
  --xti-mascot-size: 240px;
  --xti-glow-size: 280px;
  --xti-mascot-section-height: 280px;
  --xti-message-font-size: 2rem;
  --xti-lang-font-size: 1.25rem;
  --xti-progress-height: 16px;
  --xti-tip-font-size: 1.5rem;
  --xti-tip-icon-size: 32px;
  --xti-time-font-size: 1.5rem;
  --xti-dot-size: 12px;
  --xti-particle-size: 8px;
  --xti-cancel-font-size: 1.5rem;
  --xti-cancel-padding: 0.75rem 1.5rem;
}

.xti-tv-1440p {
  --xti-scale: 2.5;
  --xti-container-width: 1000px;
  --xti-card-padding: 3rem;
  --xti-mascot-size: 300px;
  --xti-glow-size: 350px;
  --xti-mascot-section-height: 350px;
  --xti-message-font-size: 2.5rem;
  --xti-lang-font-size: 1.5rem;
  --xti-progress-height: 20px;
  --xti-tip-font-size: 1.75rem;
  --xti-tip-icon-size: 40px;
  --xti-time-font-size: 1.75rem;
  --xti-dot-size: 16px;
  --xti-particle-size: 10px;
  --xti-cancel-font-size: 1.75rem;
  --xti-cancel-padding: 1rem 2rem;
}

.xti-tv-4k {
  --xti-scale: 3.5;
  --xti-container-width: 1400px;
  --xti-card-padding: 4rem;
  --xti-mascot-size: 420px;
  --xti-glow-size: 490px;
  --xti-mascot-section-height: 490px;
  --xti-message-font-size: 3.5rem;
  --xti-lang-font-size: 2rem;
  --xti-progress-height: 28px;
  --xti-tip-font-size: 2.25rem;
  --xti-tip-icon-size: 56px;
  --xti-time-font-size: 2.25rem;
  --xti-dot-size: 22px;
  --xti-particle-size: 14px;
  --xti-cancel-font-size: 2.25rem;
  --xti-cancel-padding: 1.25rem 2.5rem;
}