/**
 * CareersDNA.ai - Unified Branded Loading System
 * Palette sampled directly from the neural-brain & crescent logo.
 * Performance: pure CSS animations (transform & opacity only), zero layout shift.
 */

:root {
  /* ─── 1. EXACT BRAND PALETTE SAMPLED FROM LOGO ────────────────── */
  --brand-orange: #FF8A1F;
  --brand-pink: #F2308C;
  --brand-purple: #8A2BE2;
  --brand-blue: #1E2A9E;
  --brand-cyan: #5EE7FF;
  --brand-gradient: linear-gradient(135deg, #FF8A1F 0%, #F2308C 35%, #8A2BE2 70%, #1E2A9E 100%);
  --brand-gradient-h: linear-gradient(90deg, #FF8A1F 0%, #F2308C 35%, #8A2BE2 70%, #1E2A9E 100%);

  /* ─── Light Mode Tokens ─────────────────────────────────────── */
  --loader-bg: #FFFFFF;
  --loader-bg-subtle: #F8FAFC;
  --loader-text: #0F172A;
  --loader-text-muted: #64748B;
  --loader-ring-track: rgba(30, 42, 158, 0.08);
  --loader-bar-track: rgba(138, 43, 226, 0.10);
  --loader-glow-1: rgba(242, 48, 140, 0.14);
  --loader-glow-2: rgba(94, 231, 255, 0.12);
  --skeleton-bg: #E2E8F0;
  --skeleton-shimmer: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.6) 50%, transparent 100%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --loader-bg: #0B0F19;
    --loader-bg-subtle: #080C14;
    --loader-text: #F8FAFC;
    --loader-text-muted: #94A3B8;
    --loader-ring-track: rgba(94, 231, 255, 0.12);
    --loader-bar-track: rgba(138, 43, 226, 0.18);
    --loader-glow-1: rgba(242, 48, 140, 0.22);
    --loader-glow-2: rgba(94, 231, 255, 0.18);
    --skeleton-bg: #1E293B;
    --skeleton-shimmer: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.08) 50%, transparent 100%);
  }
}

[data-theme="dark"] {
  --loader-bg: #0B0F19;
  --loader-bg-subtle: #080C14;
  --loader-text: #F8FAFC;
  --loader-text-muted: #94A3B8;
  --loader-ring-track: rgba(94, 231, 255, 0.12);
  --loader-bar-track: rgba(138, 43, 226, 0.18);
  --loader-glow-1: rgba(242, 48, 140, 0.22);
  --loader-glow-2: rgba(94, 231, 255, 0.18);
  --skeleton-bg: #1E293B;
  --skeleton-shimmer: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.08) 50%, transparent 100%);
}

/* ─── 2. BASE SHELL & FULLSCREEN VARIANT ──────────────────────── */
.app-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  contain: layout paint;
  box-sizing: border-box;
  animation: ldrFadeIn 240ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.app-loader-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background-color: var(--loader-bg);
  background-image: radial-gradient(circle at 50% 42%, var(--loader-glow-1) 0%, transparent 64%);
  padding: env(safe-area-inset-top, 24px) env(safe-area-inset-right, 24px) env(safe-area-inset-bottom, 24px) env(safe-area-inset-left, 24px);
}

.app-loader-exit {
  animation: ldrFadeOut 300ms cubic-bezier(0.4, 0, 1, 1) forwards !important;
  pointer-events: none;
}

/* Suppress floating WhatsApp & chatbot buttons while fullscreen loader active */
body:has(.app-loader-fullscreen) :is(.whatsapp-float, .chat-assistant-btn, [class*="whatsapp"], [class*="chatbot"]) {
  opacity: 0 !important;
  pointer-events: none !important;
  transition: opacity 200ms ease;
}

.app-loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: clamp(280px, 90vw, 420px);
}

/* ─── 3. FOCAL ELEMENT: LOGO + GRADIENT CRESCENT RING + SPARKLES ─ */
.app-loader-mark-wrap {
  position: relative;
  width: clamp(108px, 18vw, 144px);
  height: clamp(108px, 18vw, 144px);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Soft shifting blurred ambient glow (opacity only) */
.app-loader-ambient-glow {
  position: absolute;
  inset: -6%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--loader-glow-1) 0%, var(--loader-glow-2) 45%, transparent 70%);
  filter: blur(14px);
  pointer-events: none;
  animation: ldrGlowShift 4s ease-in-out infinite alternate;
  will-change: opacity, transform;
}

/* Single Thin Gradient SVG Ring (Echoing crescent C) */
.app-loader-svg-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  animation: ldrSpinRing 2.6s linear infinite;
  will-change: transform;
}

.app-loader-ring-track {
  fill: none;
  stroke: var(--loader-ring-track);
  stroke-width: 2.2;
}

.app-loader-ring-arc {
  fill: none;
  stroke: url(#brandLoaderGradient);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-dasharray: 215 85;
  transform-origin: center;
}

/* Central Logo Disc with Gentle Breathe Pulse */
.app-loader-logo-disc {
  position: relative;
  width: 62%;
  height: 62%;
  border-radius: 50%;
  background: var(--loader-bg);
  box-shadow: 0 4px 20px rgba(30, 42, 158, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  box-sizing: border-box;
  animation: ldrBreathe 2.4s ease-in-out infinite;
  will-change: transform, opacity;
}

.app-loader-logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 50%;
  display: block;
}

/* 4 Staggered Neural Cyan Sparkle Dots */
.app-loader-sparkles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.app-loader-sparkle {
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--brand-cyan);
  box-shadow: 0 0 8px var(--brand-cyan), 0 0 12px rgba(94, 231, 255, 0.8);
  animation: ldrTwinkle 1.8s ease-in-out infinite;
  will-change: transform, opacity;
}

.app-loader-sparkle:nth-child(1) { top: 26%; right: 28%; animation-delay: 0s; }
.app-loader-sparkle:nth-child(2) { top: 38%; right: 22%; animation-delay: 0.45s; width: 4px; height: 4px; }
.app-loader-sparkle:nth-child(3) { top: 46%; right: 34%; animation-delay: 0.9s; width: 4.5px; height: 4.5px; }
.app-loader-sparkle:nth-child(4) { top: 32%; right: 38%; animation-delay: 1.35s; width: 3.5px; height: 3.5px; }

/* ─── 4. TYPOGRAPHY (SENTENCE CASE WITH BRAND GRADIENT) ────────── */
.app-loader-title {
  margin: clamp(20px, 3.5vw, 28px) 0 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.3;
}

.app-loader-subtext-track {
  height: 20px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.app-loader-subtext {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: clamp(0.8125rem, 1.8vw, 0.875rem);
  font-weight: 500;
  color: var(--loader-text-muted);
  line-height: 1.35;
  transition: opacity 280ms ease, transform 280ms ease;
  will-change: transform, opacity;
}

.app-loader-subtext.is-entering { opacity: 0; transform: translateY(5px); }
.app-loader-subtext.is-active { opacity: 1; transform: translateY(0); }
.app-loader-subtext.is-leaving { opacity: 0; transform: translateY(-5px); }

/* ─── 5. SLIM 3PX INDETERMINATE PROGRESS SHIMMER ───────────────── */
.app-loader-bar-wrap {
  margin-top: clamp(16px, 3vw, 22px);
  width: clamp(124px, 30vw, 150px);
  height: 3px;
  background-color: var(--loader-bar-track);
  border-radius: 9999px;
  position: relative;
  overflow: hidden;
  contain: strict;
}

.app-loader-bar-fill {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 45%;
  border-radius: 9999px;
  background: linear-gradient(90deg, transparent 0%, var(--brand-orange) 25%, var(--brand-pink) 50%, var(--brand-purple) 75%, transparent 100%);
  animation: ldrShimmer 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  will-change: transform;
}

/* ─── 6. INLINE / SECTION VARIANT (size="sm|md|lg") ────────────── */
.app-loader-inline {
  display: inline-flex;
  padding: 12px;
}
.app-loader-inline.size-sm .app-loader-mark-wrap { width: 36px; height: 36px; }
.app-loader-inline.size-md .app-loader-mark-wrap { width: 56px; height: 56px; }
.app-loader-inline.size-lg .app-loader-mark-wrap { width: 88px; height: 88px; }

/* ─── 7. BUTTON LOADER (stable width) ─────────────────────────── */
.btn-loader-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-top-color: var(--brand-cyan);
  border-right-color: var(--brand-pink);
  border-radius: 50%;
  animation: ldrSpinRing 0.75s linear infinite;
  vertical-align: middle;
  will-change: transform;
}

/* ─── 8. TOP ROUTE PROGRESS BAR ───────────────────────────────── */
.route-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 100000;
  background: var(--brand-gradient-h);
  transform-origin: 0% 50%;
  animation: ldrRoutePulse 2s ease-in-out infinite;
  box-shadow: 0 0 10px rgba(242, 48, 140, 0.5);
  pointer-events: none;
}

/* ─── 9. SKELETON PLACEHOLDERS ────────────────────────────────── */
.skeleton-box {
  background-color: var(--skeleton-bg);
  position: relative;
  overflow: hidden;
  border-radius: 8px;
}
.skeleton-box::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--skeleton-shimmer);
  animation: ldrSkeletonShimmer 1.5s infinite;
  will-change: transform;
}

/* ─── 10. AI / CHATBOT THINKING INDICATOR ─────────────────────── */
.ai-thinking-dots {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
}
.ai-thinking-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  animation: ldrThinkingPulse 1.4s ease-in-out infinite;
  will-change: transform, opacity;
}
.ai-thinking-dot:nth-child(1) { background-color: var(--brand-orange); animation-delay: 0s; }
.ai-thinking-dot:nth-child(2) { background-color: var(--brand-pink); animation-delay: 0.2s; }
.ai-thinking-dot:nth-child(3) { background-color: var(--brand-cyan); animation-delay: 0.4s; }

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

/* ─── GPU-ACCELERATED KEYFRAMES (TRANSFORM & OPACITY ONLY) ────── */
@keyframes ldrSpinRing { to { transform: rotate(360deg); } }
@keyframes ldrBreathe {
  0%, 100% { transform: scale(1); opacity: 0.94; }
  50% { transform: scale(1.05); opacity: 1; }
}
@keyframes ldrTwinkle {
  0%, 100% { transform: scale(0.6); opacity: 0.2; }
  50% { transform: scale(1.2); opacity: 1; }
}
@keyframes ldrGlowShift {
  0% { opacity: 0.7; transform: scale(0.96); }
  100% { opacity: 1; transform: scale(1.04); }
}
@keyframes ldrShimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(330%); }
}
@keyframes ldrFadeIn {
  from { opacity: 0; transform: scale(0.985); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes ldrFadeOut {
  from { opacity: 1; transform: scale(1); }
  to { opacity: 0; transform: scale(0.985); }
}
@keyframes ldrRoutePulse {
  0% { transform: scaleX(0.05); }
  50% { transform: scaleX(0.75); }
  100% { transform: scaleX(0.98); }
}
@keyframes ldrSkeletonShimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
@keyframes ldrThinkingPulse {
  0%, 100% { transform: scale(0.7); opacity: 0.4; }
  50% { transform: scale(1.2); opacity: 1; }
}

/* ─── PREFERS-REDUCED-MOTION (ACCESSIBLE FALLBACK) ────────────── */
@media (prefers-reduced-motion: reduce) {
  .app-loader, .app-loader-svg-ring, .app-loader-logo-disc,
  .app-loader-sparkle, .app-loader-ambient-glow, .app-loader-bar-fill,
  .btn-loader-spinner, .route-progress-bar, .skeleton-box::after, .ai-thinking-dot {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
  .app-loader-bar-fill { width: 100%; opacity: 0.85; }
  .app-loader-sparkle { opacity: 0.7; transform: none; }
}