/* =============================================
   EXAMREADY — ANIMATIONS & MOTION SYSTEM v3
   ============================================= */

/* ===== LOADING OVERLAY ===== */
#er-loader {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: #0a0a0a;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  overflow: hidden;
  transition: opacity 0.55s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.75s cubic-bezier(0.76, 0, 0.24, 1);
}

#er-loader.er-loader--exit {
  opacity: 0;
  transform: translateY(-100%);
  pointer-events: none;
}

.er-loader-bg-glow {
  position: absolute;
  width: 720px;
  height: 720px;
  border-radius: 50%;
  background: radial-gradient(circle,
    rgba(232, 33, 26, 0.22) 0%,
    rgba(232, 33, 26, 0.07) 40%,
    transparent 70%);
  animation: er-pulse-glow 2.8s ease-in-out infinite;
}

.er-loader-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  animation: er-grid-drift 14s linear infinite;
  mask-image: radial-gradient(ellipse 75% 75% at 50% 50%, black, transparent);
}

.er-loader-content {
  position: relative;
  z-index: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.er-loader-brand {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(56px, 10vw, 100px);
  letter-spacing: 5px;
  color: #fff;
  line-height: 1;
  display: flex;
  align-items: center;
  overflow: hidden;
  filter: drop-shadow(0 0 48px rgba(232, 33, 26, 0.35));
}

.er-brand-chunk {
  display: inline-block;
  opacity: 0;
  transform: translateY(64px) rotateX(-18deg);
  animation: er-brand-rise 0.65s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  transform-origin: bottom center;
}

.er-brand-chunk:nth-child(1) { animation-delay: 0.06s; }
.er-brand-chunk:nth-child(2) { animation-delay: 0.16s; color: #e8211a; }
.er-brand-chunk:nth-child(3) { animation-delay: 0.26s; }
.er-brand-chunk:nth-child(4) { animation-delay: 0.16s; }
.er-brand-chunk.er-space { animation: none; opacity: 1; }

.er-loader-divider {
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #e8211a, transparent);
  animation: er-line-expand 0.5s ease 0.6s forwards;
  border-radius: 2px;
}

.er-loader-tagline {
  color: rgba(255, 255, 255, 0.38);
  font-family: 'Nunito', sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 4px;
  text-transform: uppercase;
  opacity: 0;
  animation: er-fade-up 0.5s ease 0.8s forwards;
}

.er-loader-bar-wrap {
  width: 200px;
  height: 2px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 99px;
  overflow: hidden;
  opacity: 0;
  animation: er-fade-in 0.3s ease 0.7s forwards;
}

.er-loader-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #e8211a, #ff7055, #e8211a);
  background-size: 200% 100%;
  border-radius: 99px;
  animation: er-progress 1.5s cubic-bezier(0.4, 0, 0.2, 1) 0.45s forwards,
             er-bar-shimmer 1.4s linear 0.45s infinite;
}

.er-loader-dots {
  display: flex;
  gap: 10px;
  opacity: 0;
  animation: er-fade-in 0.3s ease 0.95s forwards;
}

.er-loader-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(232, 33, 26, 0.65);
  animation: er-dot-bounce 1.3s ease-in-out infinite;
}

.er-loader-dot:nth-child(1) { animation-delay: 0s; }
.er-loader-dot:nth-child(2) { animation-delay: 0.18s; }
.er-loader-dot:nth-child(3) { animation-delay: 0.36s; }


/* ===== SCROLL ANIMATION BASE ===== */
.er-animate {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.er-animate.er-visible {
  opacity: 1;
  transform: translateY(0);
}

.er-animate-left {
  opacity: 0;
  transform: translateX(-24px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.er-animate-left.er-visible {
  opacity: 1;
  transform: translateX(0);
}

.er-animate-scale {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.er-animate-scale.er-visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays */
.er-stagger > *:nth-child(1)  { transition-delay: 0ms; }
.er-stagger > *:nth-child(2)  { transition-delay: 52ms; }
.er-stagger > *:nth-child(3)  { transition-delay: 104ms; }
.er-stagger > *:nth-child(4)  { transition-delay: 156ms; }
.er-stagger > *:nth-child(5)  { transition-delay: 208ms; }
.er-stagger > *:nth-child(6)  { transition-delay: 260ms; }
.er-stagger > *:nth-child(7)  { transition-delay: 312ms; }
.er-stagger > *:nth-child(8)  { transition-delay: 364ms; }
.er-stagger > *:nth-child(9)  { transition-delay: 416ms; }
.er-stagger > *:nth-child(10) { transition-delay: 468ms; }


/* ===== HERO ===== */
.hero, .page-hero { isolation: isolate; }

.hero::before, .page-hero::before {
  background-size: 120% 120%;
  background-position: 50% 50%;
  transform: scale(1.06);
  transform-origin: center;
  animation: er-hero-pan 22s ease-in-out infinite;
  will-change: transform;
}

.hero::after, .page-hero::after {
  content: '';
  position: absolute;
  width: clamp(240px, 32vw, 520px);
  height: clamp(240px, 32vw, 520px);
  right: -8%;
  top: -14%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.12), transparent 38%),
    radial-gradient(circle at 50% 50%, rgba(232,33,26,0.2), rgba(232,33,26,0.02) 58%, transparent 72%);
  filter: blur(8px);
  opacity: 0.65;
  z-index: 0;
  pointer-events: none;
  transform: translate3d(var(--hero-shift-x, 0px), var(--hero-shift-y, 0px), 0);
  animation: er-float-orb 16s ease-in-out infinite;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-content, .page-hero-inner, .hero-inner {
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

.hero h1, .page-hero h1 {
  opacity: 0;
  transform: translateY(26px);
  animation: er-hero-enter 0.85s cubic-bezier(0.22, 1, 0.36, 1) 0.12s forwards;
}

.hero p, .page-hero p {
  opacity: 0;
  transform: translateY(18px);
  animation: er-hero-enter 0.72s cubic-bezier(0.22, 1, 0.36, 1) 0.26s forwards;
}

.hero-badge, .hero-stats, .hero-btns,
.hero-meta, .breadcrumb, .hero-chip {
  opacity: 0;
  animation: er-fade-up 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.08s forwards;
}

.hero-badge, .hero-chip, .hero-meta .hero-chip {
  animation-name: er-fade-up, er-soft-float;
  animation-duration: 0.6s, 7.5s;
  animation-delay: 0.08s, 0.85s;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1), ease-in-out;
  animation-fill-mode: forwards, both;
  animation-iteration-count: 1, infinite;
}

.hero-btns { animation-delay: 0.4s; }
.hero-stats { animation-delay: 0.5s; }

.hero-stats .stat,
.hero-meta .hero-chip,
.hero-panel,
.hero-side {
  animation: er-soft-float 8.5s ease-in-out infinite;
}

.hero-stats .stat:nth-child(2),
.hero-meta .hero-chip:nth-child(2) { animation-delay: 0.5s; }
.hero-stats .stat:nth-child(3),
.hero-meta .hero-chip:nth-child(3) { animation-delay: 1s; }
.hero-stats .stat:nth-child(4),
.hero-meta .hero-chip:nth-child(4) { animation-delay: 1.5s; }

.section-title,
.page-hero h1 span,
.hero h1 span {
  animation: er-title-glow 6s ease-in-out infinite;
}


/* ===== TYPING CARET ===== */
.er-typed-heading .er-typing-caret {
  display: inline-block;
  width: 0.1em;
  height: 0.88em;
  margin-left: 0.06em;
  vertical-align: -0.07em;
  border-radius: 2px;
  background: currentColor;
  animation: er-caret-blink 1s steps(1) infinite;
}


/* ===== HEADER ===== */
header {
  animation: er-header-drop 0.65s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  transition: box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}

header.er-scrolled {
  box-shadow: 0 4px 32px rgba(0,0,0,0.6);
}

nav a {
  position: relative;
  transition: color 0.2s ease, background 0.2s ease !important;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  right: 50%;
  height: 2px;
  background: #e8211a;
  border-radius: 2px;
  transition: left 0.28s cubic-bezier(0.22, 1, 0.36, 1),
              right 0.28s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.28s ease;
  opacity: 0;
}

nav a:hover::after, nav a.active::after {
  left: 8px;
  right: 8px;
  opacity: 1;
}


/* ===== CARD HOVER ===== */
.subject-card,
.class-card,
.quiz-card,
.sol-card,
.feature-card,
.post-card,
.qb-card {
  transition: transform 0.32s cubic-bezier(0.34, 1.52, 0.64, 1),
              box-shadow 0.32s ease,
              border-color 0.25s ease !important;
  will-change: transform;
}

.subject-card { overflow: hidden; }

.subject-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    circle at var(--mx, 50%) var(--my, 50%),
    rgba(232,33,26,0.1) 0%,
    transparent 62%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.subject-card:hover::after { opacity: 1; }

/* Press effect */
.subject-card:active,
.class-card:active,
.quiz-card:active,
.post-card:active {
  transform: scale(0.978) !important;
  transition-duration: 0.1s !important;
}


/* ===== BUTTON RIPPLE ===== */
.btn-primary,
.btn-dl,
.quiz-btn,
.btn-red,
.post-link,
.resource-link {
  position: relative;
  overflow: hidden;
}

.btn-primary::before,
.btn-dl::before,
.quiz-btn::before,
.post-link::before,
.resource-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.52s ease, height 0.52s ease, opacity 0.52s ease;
  opacity: 0;
}

.btn-primary:hover::before,
.btn-dl:hover::before,
.quiz-btn:hover::before,
.post-link:hover::before,
.resource-link:hover::before {
  width: 400px;
  height: 400px;
  opacity: 1;
}

.btn-primary:active,
.btn-dl:active,
.quiz-btn:active,
.post-link:active,
.resource-link:active {
  transform: scale(0.96) !important;
  transition-duration: 0.08s !important;
}


/* ===== STAT SHIMMER ===== */
.stat-card {
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: -120%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  animation: er-card-shimmer 3.8s ease-in-out infinite;
  pointer-events: none;
  border-radius: inherit;
}


/* ===== FOOTER LINKS ===== */
footer .footer-col a {
  transition: color 0.2s ease, transform 0.24s cubic-bezier(0.34, 1.52, 0.64, 1);
  display: block;
}

footer .footer-col a:hover {
  transform: translateX(5px);
}


/* ===== PDF / RESOURCE ITEMS ===== */
.pdf-item, .resource-item {
  transition: transform 0.26s cubic-bezier(0.34, 1.52, 0.64, 1),
              border-color 0.22s ease,
              box-shadow 0.22s ease !important;
}

.pdf-item:hover, .resource-item:hover {
  transform: translateX(5px);
}


/* ===== FILTER BUTTONS ===== */
.filter-btn, .res-tab, .tab-btn {
  transition: background 0.2s ease,
              border-color 0.2s ease,
              color 0.2s ease,
              transform 0.2s cubic-bezier(0.34, 1.52, 0.64, 1) !important;
}

.filter-btn:hover, .res-tab:hover, .tab-btn:hover {
  transform: translateY(-2px);
}

.filter-btn:active, .res-tab:active, .tab-btn:active {
  transform: scale(0.96);
}


/* ===== LOGO ===== */
.logo-wrap img {
  transition: transform 0.32s cubic-bezier(0.34, 1.52, 0.64, 1), filter 0.28s ease;
}

.logo-wrap:hover img {
  transform: scale(1.07);
  filter: drop-shadow(0 0 16px rgba(232,33,26,0.42));
}


/* ===== SIDEBAR NAV ===== */
.nav-item {
  transition: background 0.18s ease, color 0.18s ease,
              transform 0.2s cubic-bezier(0.34, 1.52, 0.64, 1) !important;
}

.nav-item:hover { transform: translateX(4px) !important; }


/* ===== SCORE POP ===== */
.score-big {
  animation: er-score-pop 0.65s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}


/* ===== TABLE ===== */
table tr { transition: background 0.15s ease; }


/* ===== ANNOUNCEMENT ===== */
#siteAnnouncement {
  animation: er-slide-down 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}


/* ===== BACK TO TOP ===== */
#er-back-top {
  transition: opacity 0.32s ease,
              transform 0.32s cubic-bezier(0.34, 1.56, 0.64, 1),
              background 0.18s ease,
              box-shadow 0.18s ease !important;
}


/* ===== SCROLL PROGRESS ===== */
#er-scroll-progress {
  position: fixed;
  top: 64px;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, #e8211a, #ff7055);
  z-index: 9999;
  transition: width 0.06s linear;
  border-radius: 0 2px 2px 0;
  box-shadow: 0 0 10px rgba(232,33,26,0.55);
}


/* ===== PAGE REVEAL ===== */
body { animation: er-page-reveal 0.4s ease forwards; }


/* ===== HERO STATIC OVERRIDE ===== */
.hero.hero-static::before, .hero.hero-static::after,
.hero.hero-static .hero-badge, .hero.hero-static .hero-btns,
.hero.hero-static .hero-stats, .hero.hero-static h1,
.hero.hero-static p, .hero.hero-static .stat,
.hero.hero-static h1 span {
  animation: none !important;
}

.hero.hero-static h1, .hero.hero-static p,
.hero.hero-static .hero-badge, .hero.hero-static .hero-btns,
.hero.hero-static .hero-stats {
  opacity: 1 !important;
  transform: none !important;
}

.hero.hero-static h1 span { animation: none !important; }


/* ===== SMOOTH INPUT FOCUS ===== */
input, select, textarea {
  transition: border-color 0.2s ease, box-shadow 0.2s ease !important;
}

input:focus, select:focus, textarea:focus {
  box-shadow: 0 0 0 3px rgba(232, 33, 26, 0.1) !important;
}

:focus-visible {
  outline: 2px solid rgba(232, 33, 26, 0.7);
  outline-offset: 3px;
  border-radius: 6px;
}


/* ===== SHIMMER SKELETON ===== */
.er-shimmer {
  background: linear-gradient(90deg, #f0f0f0 25%, #e8e8e8 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: er-shimmer 1.4s infinite;
  border-radius: 8px;
}


/* ===== KEYFRAMES ===== */
@keyframes er-brand-rise {
  to { opacity: 1; transform: translateY(0) rotateX(0deg); }
}

@keyframes er-hero-enter {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes er-fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes er-fade-in { to { opacity: 1; } }

@keyframes er-progress {
  0%   { width: 0%; }
  38%  { width: 50%; }
  68%  { width: 75%; }
  100% { width: 100%; }
}

@keyframes er-bar-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes er-line-expand {
  from { width: 0; }
  to   { width: 88px; }
}

@keyframes er-pulse-glow {
  0%, 100% { transform: scale(1);   opacity: 0.45; }
  50%       { transform: scale(1.2); opacity: 1; }
}

@keyframes er-dot-bounce {
  0%, 80%, 100% { transform: translateY(0) scale(1);       opacity: 0.45; }
  40%           { transform: translateY(-10px) scale(1.1); opacity: 1; }
}

@keyframes er-header-drop {
  from { transform: translateY(-100%); opacity: 0; }
  to   { transform: translateY(0);     opacity: 1; }
}

@keyframes er-score-pop {
  0%   { transform: scale(0.38); opacity: 0; }
  62%  { transform: scale(1.08); }
  100% { transform: scale(1);    opacity: 1; }
}

@keyframes er-hero-pan {
  0%, 100% { transform: scale(1.06) translate3d(0, 0, 0);     opacity: 0.92; }
  50%       { transform: scale(1.12) translate3d(-2%, 2%, 0); opacity: 1; }
}

@keyframes er-float-orb {
  0%, 100% { transform: translate3d(var(--hero-shift-x, 0px), var(--hero-shift-y, 0px), 0) scale(1); }
  33%       { transform: translate3d(calc(var(--hero-shift-x, 0px) - 16px), calc(var(--hero-shift-y, 0px) + 22px), 0) scale(1.06); }
  66%       { transform: translate3d(calc(var(--hero-shift-x, 0px) + 12px), calc(var(--hero-shift-y, 0px) - 12px), 0) scale(0.97); }
}

@keyframes er-soft-float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

@keyframes er-title-glow {
  0%, 100% { text-shadow: 0 0 0 rgba(232,33,26,0); }
  50%       { text-shadow: 0 0 28px rgba(232,33,26,0.2); }
}

@keyframes er-caret-blink {
  0%, 44%  { opacity: 1; }
  45%, 100% { opacity: 0; }
}

@keyframes er-slide-down {
  from { transform: translateY(-100%); opacity: 0; }
  to   { transform: translateY(0);     opacity: 1; }
}

@keyframes er-page-reveal {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes er-card-shimmer {
  0%   { left: -120%; opacity: 0; }
  18%  { opacity: 1; }
  82%  { opacity: 1; }
  100% { left: 220%; opacity: 0; }
}

@keyframes er-grid-drift {
  from { background-position: 0 0; }
  to   { background-position: 44px 44px; }
}

@keyframes er-shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}

@keyframes er-ripple {
  from { transform: translate(-50%,-50%) scale(0); opacity: 0.5; }
  to   { transform: translate(-50%,-50%) scale(4); opacity: 0; }
}


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

  #er-loader { display: none; }

  .hero::after, .page-hero::after, .hero::before, .page-hero::before,
  .hero-badge, .hero-chip, .hero-meta .hero-chip,
  .hero-stats .stat, .hero-panel, .hero-side,
  .section-title, .page-hero h1 span, .hero h1 span {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}