/* =========================================================
   NUMNora.mn — graphics quality + guided home page
   ---------------------------------------------------------
   <html data-gfx="low | medium | high | ultra">  (Settings → Graphics)

   low     flat pastel colours, no shadows / blur / animation → fastest
   medium  the normal look + a soft background tint
   high    + finer shadows, button shine, ripple, cards that lift, sections that fade in
   ultra   + moving gradients, glass cards, and each theme's symbols
           (leaves, monkeys & bananas / stars / clouds) — unlocked in the shop
   The symbols themselves are added by js/graphics.js.
   ========================================================= */

/* ---------- LOW: flat pastels, nothing moving ---------- */
:root[data-gfx="low"] *,
:root[data-gfx="low"] *::before,
:root[data-gfx="low"] *::after {
  animation: none !important;
  transition: none !important;
  box-shadow: none !important;
  text-shadow: none !important;
  backdrop-filter: none !important;
}
:root[data-gfx="low"] {
  --gradient: var(--primary);
  --gradient-text: var(--primary-text);
  --shadow: none;
}
:root[data-gfx="low"][data-theme="light"] { --bg: #f7f1e8; --bg-soft: #f0e6d8; --surface-2: #f9f4ec; --accent: #a9d3f5; --accent-strong: #2a7fc9; }
:root[data-gfx="low"][data-theme="green"] { --bg: #eef6e4; --bg-soft: #e2efd2; --accent: #cfeaa6; }
:root[data-gfx="low"][data-theme="dark"] { --accent: #9cc9ee; }
:root[data-gfx="low"] .site-header { background: var(--bg); }
:root[data-gfx="low"] .hero::before,
:root[data-gfx="low"] .hero::after,
:root[data-gfx="low"] .page-intro::after,
:root[data-gfx="low"] .snowflake,
:root[data-gfx="low"] .mouse-buddy,
:root[data-gfx="low"] .nav-arrow { display: none; }
:root[data-gfx="low"] .page-intro { background: var(--bg-soft); }
:root[data-gfx="low"] .cta-banner,
:root[data-gfx="low"] .wallet-card { background: var(--primary); }
:root[data-gfx="low"] .hero-title .gradient-text,
:root[data-gfx="low"] .live-card-time { background: none; color: var(--primary-text); }
:root[data-gfx="low"] .skeleton { background: var(--surface-2); }
:root[data-gfx="low"] .nav-sub { transform: none; }
:root[data-gfx="low"] .nora-button { filter: none; }

/* ---------- HIGH (and ULTRA): finer finish + button effects ---------- */
:root[data-gfx="high"],
:root[data-gfx="ultra"] {
  --shadow: 0 1px 1px rgba(0, 0, 0, 0.04), 0 4px 8px rgba(0, 0, 0, 0.05), 0 18px 44px color-mix(in srgb, var(--primary) 16%, transparent);
}
:is([data-gfx="high"], [data-gfx="ultra"]) .site-header {
  backdrop-filter: blur(18px) saturate(1.6);
  border-bottom-color: transparent;
  background-image: linear-gradient(to right, transparent, var(--accent), transparent);
  background-size: 100% 1px;
  background-position: bottom;
  background-repeat: no-repeat;
}

/* Buttons: light sweeps across, soft glow, ripple where you press */
:is([data-gfx="high"], [data-gfx="ultra"]) .btn { position: relative; overflow: hidden; isolation: isolate; }
:is([data-gfx="high"], [data-gfx="ultra"]) .btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.38) 50%, transparent 70%);
  transform: translateX(-130%);
  transition: transform 0.65s ease;
}
:is([data-gfx="high"], [data-gfx="ultra"]) .btn:hover::before { transform: translateX(130%); }
:is([data-gfx="high"], [data-gfx="ultra"]) .btn--primary { box-shadow: 0 8px 22px color-mix(in srgb, var(--primary) 38%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.22); }
:is([data-gfx="high"], [data-gfx="ultra"]) .btn--accent { box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 42%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.35); }
:is([data-gfx="high"], [data-gfx="ultra"]) .btn--ghost:hover { box-shadow: 0 0 0 4px var(--accent-tint); }
.ripple {
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  transform: scale(0);
  animation: ripple 0.6s ease-out forwards;
  pointer-events: none;
}
@keyframes ripple {
  to { transform: scale(1); opacity: 0; }
}

/* Cards lift with an accent outline; inputs glow */
:is([data-gfx="high"], [data-gfx="ultra"]) .card { box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 6px 18px rgba(0, 0, 0, 0.05); }
:is([data-gfx="high"], [data-gfx="ultra"]) .card--link:hover {
  transform: translateY(-5px);
  border-color: transparent;
  box-shadow: 0 0 0 1.5px var(--accent), 0 22px 44px color-mix(in srgb, var(--accent) 24%, transparent);
}
:is([data-gfx="high"], [data-gfx="ultra"]) .input:focus { box-shadow: 0 0 0 4px var(--accent-tint), 0 6px 18px var(--accent-tint); }
:is([data-gfx="high"], [data-gfx="ultra"]) .chip.is-active { box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 45%, transparent); }

/* Sections fade up as you scroll to them (class added by js/graphics.js) */
.reveal { opacity: 0; transform: translateY(22px); }
.reveal.is-in { opacity: 1; transform: none; transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1); }

/* ---------- ULTRA: gradients in motion + glass ---------- */
:root[data-gfx="ultra"] {
  --gradient: linear-gradient(120deg, var(--primary), var(--accent), var(--primary-strong), var(--accent));
}
:root[data-gfx="ultra"] body::before {
  content: "";
  position: fixed;
  inset: -20%;
  z-index: -1;
  background:
    radial-gradient(38% 34% at 18% 22%, color-mix(in srgb, var(--accent) 34%, transparent), transparent 70%),
    radial-gradient(34% 30% at 82% 30%, color-mix(in srgb, var(--primary) 30%, transparent), transparent 70%),
    radial-gradient(40% 36% at 55% 85%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 70%);
  animation: drift 26s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes drift {
  0% { transform: translate(0, 0) rotate(0deg) scale(1); }
  50% { transform: translate(4%, -3%) rotate(8deg) scale(1.08); }
  100% { transform: translate(-4%, 3%) rotate(-6deg) scale(1.04); }
}
:root[data-gfx="ultra"] .section--soft { background: color-mix(in srgb, var(--bg-soft) 55%, transparent); }
:root[data-gfx="ultra"] .card:not(.bento-tile) {
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
}
:root[data-gfx="ultra"] .btn--primary,
:root[data-gfx="ultra"] .cta-banner,
:root[data-gfx="ultra"] .nav-link.is-active,
:root[data-gfx="ultra"] .time-bar span,
:root[data-gfx="ultra"] .progress span {
  background-image: var(--gradient);
  background-size: 300% 100%;
  animation: flow 9s linear infinite;
}
@keyframes flow {
  to { background-position: 300% 0; }
}
:root[data-gfx="ultra"] :is(.page-intro h1, .section-head h2, .school-group h2, .guide-head h2) {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
:root[data-gfx="ultra"] .hero::before { animation: float-a 14s ease-in-out infinite alternate; }
:root[data-gfx="ultra"] .hero::after { animation: float-b 17s ease-in-out infinite alternate; }
@keyframes float-a { to { transform: translate(-70px, 50px) scale(1.15); } }
@keyframes float-b { to { transform: translate(80px, -40px) scale(1.2); } }

/* ----- Ultra symbols (elements are created by js/graphics.js) ----- */
.fx-layer { position: fixed; inset: 0; z-index: 40; overflow: hidden; pointer-events: none; }

/* Green: a leaf drifts in from one side now and then */
.fx-leaf { position: absolute; top: 0; font-size: 1.6rem; opacity: 0; animation: leaf-right var(--time, 11s) ease-in-out forwards; }
.fx-leaf.from-right { animation-name: leaf-left; }
@keyframes leaf-right {
  0% { transform: translate(-40px, 0) rotate(0deg); opacity: 0; }
  10% { opacity: 0.9; }
  50% { transform: translate(22vw, 34vh) rotate(160deg); }
  90% { opacity: 0.8; }
  100% { transform: translate(34vw, 78vh) rotate(380deg); opacity: 0; }
}
@keyframes leaf-left {
  0% { transform: translate(40px, 0) rotate(0deg); opacity: 0; }
  10% { opacity: 0.9; }
  50% { transform: translate(-22vw, 34vh) rotate(-160deg); }
  90% { opacity: 0.8; }
  100% { transform: translate(-34vw, 78vh) rotate(-380deg); opacity: 0; }
}

/* Green: monkeys and bananas hang from the menu buttons on a little vine */
.fx-hang {
  position: absolute;
  top: 100%;
  left: 50%;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 1.15rem;
  line-height: 1;
  transform-origin: top center;
  animation: swing var(--time, 3.2s) ease-in-out infinite alternate;
  pointer-events: none;
  transition: opacity 0.2s;
}
.fx-hang::before { content: ""; width: 2px; height: var(--vine, 12px); background: var(--primary); opacity: 0.6; }
.nav-item:hover .fx-hang,
.nav-item:focus-within .fx-hang { opacity: 0; } /* make room for the dropdown */
@keyframes swing {
  from { transform: translateX(-50%) rotate(-11deg); }
  to { transform: translateX(-50%) rotate(11deg); }
}

/* Dark: a quiet starfield, and a shooting star now and then */
.fx-star { position: absolute; width: 2px; height: 2px; border-radius: 50%; background: #fff; animation: twinkle var(--time, 3s) ease-in-out infinite alternate; }
@keyframes twinkle { from { opacity: 0.1; } to { opacity: 0.85; } }
.fx-comet { position: absolute; width: 110px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, transparent, #fff); animation: comet 1.3s ease-out forwards; }
@keyframes comet {
  from { transform: translate(0, 0) rotate(28deg); opacity: 1; }
  to { transform: translate(46vw, 26vh) rotate(28deg); opacity: 0; }
}

/* Light: soft clouds crossing the top of the page */
.fx-cloud { position: absolute; left: -140px; font-size: 3.4rem; opacity: 0.5; filter: blur(1px); animation: cloud var(--time, 70s) linear infinite; }
@keyframes cloud { to { transform: translateX(calc(100vw + 280px)); } }

@media (prefers-reduced-motion: reduce) {
  .fx-layer, .fx-hang { display: none; }
  :root[data-gfx="ultra"] body::before { animation: none; }
  .reveal { opacity: 1; transform: none; }
}
@media (max-width: 760px) {
  .fx-hang { display: none; }
}

/* =========================================================
   Guided home page
   ========================================================= */
.scroll-hint { display: inline-flex; align-items: center; gap: 8px; margin-top: 34px; color: var(--muted) !important; font-weight: 600; font-size: 0.9rem; }
.scroll-hint span { display: inline-block; animation: bob 1.6s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(5px); } }

.guide-head { max-width: 620px; margin: 0 auto 36px; text-align: center; }
.guide-head h2 { margin: 0 0 8px; font-size: clamp(1.7rem, 4vw, 2.3rem); }
.guide-head p { margin: 0; color: var(--muted); font-size: 1.05rem; }
.guide-kicker { display: inline-block; margin-bottom: 10px; padding: 5px 12px; border-radius: 999px; background: var(--primary-tint); color: var(--primary-text); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }

/* Steps: a centre line with cards on alternating sides */
.steps { position: relative; max-width: 860px; margin: 0 auto; padding: 0; list-style: none; }
.steps::before { content: ""; position: absolute; top: 12px; bottom: 12px; left: 50%; width: 3px; border-radius: 3px; background: linear-gradient(var(--primary), var(--accent)); transform: translateX(-50%); }
.step { position: relative; display: grid; grid-template-columns: 1fr 64px 1fr; align-items: center; margin-bottom: 22px; }
.step-number {
  grid-column: 2;
  grid-row: 1;
  z-index: 1;
  width: 48px;
  height: 48px;
  margin: 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary);
  font: 800 1.1rem var(--font-ui);
  border: 4px solid var(--bg);
}
.step-card { grid-column: 1; grid-row: 1; display: flex; gap: 14px; align-items: flex-start; }
.step:nth-child(even) .step-card { grid-column: 3; }
.step-emoji { font-size: 2rem; line-height: 1; }
.step-card h3 { margin: 0 0 4px; }
.step-card p { margin: 0 0 10px; }

/* Bento grid: tiles of different sizes */
.bento { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); gap: 16px; }
.bento-tile { display: flex; flex-direction: column; justify-content: flex-end; gap: 4px; padding: 22px; overflow: hidden; position: relative; }
.bento-tile h3 { margin: 0; font-size: 1.2rem; }
.bento-tile p { margin: 0; }
.bento-emoji { position: absolute; top: 14px; right: 18px; font-size: 2.6rem; opacity: 0.9; }
.bento-tile--wide { grid-column: span 2; }
.bento-tile--tall { grid-row: span 2; }
.bento-tile--primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary) !important; }
.bento-tile--primary p { color: rgba(255, 255, 255, 0.82); }
.bento-tile--accent { background: var(--accent-tint); }
.bento-tile--soft { background: var(--primary-tint); }
.bento-demo { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: auto; padding-right: 60px; }
.bento-demo span { padding: 4px 10px; border-radius: 999px; background: rgba(255, 255, 255, 0.18); font-size: 0.78rem; font-weight: 700; }
.bento-tile:not(.bento-tile--primary) .bento-demo span { background: var(--surface-2); color: var(--muted); }

/* FAQ */
.faq { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.faq details { padding: 0; }
.faq summary { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 16px 20px; font-weight: 700; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.3rem; color: var(--accent-strong); transition: transform 0.2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0; padding: 0 20px 18px; color: var(--muted); }

@media (max-width: 960px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .steps::before { left: 24px; }
  .step { grid-template-columns: 48px 1fr; gap: 12px; }
  .step-number { grid-column: 1; }
  .step-card,
  .step:nth-child(even) .step-card { grid-column: 2; }
  .bento { grid-template-columns: 1fr; }
  .bento-tile--wide { grid-column: auto; }
  .bento-tile--tall { grid-row: auto; }
}