/* ============================================================
 * N4 Web — Shared Design System (gold / black)
 * ------------------------------------------------------------
 * Every page links this file FIRST, then its own stylesheet:
 *   <link rel="stylesheet" href="/theme.css">
 * Page stylesheets use these tokens so the whole site shares
 * one visual language.
 * ============================================================ */

:root {
  /* Brand */
  --n4-gold: #FFD700;
  --n4-gold-deep: #DAA520;
  --n4-gold-soft: rgba(255, 215, 0, 0.12);
  --n4-gold-border: rgba(255, 215, 0, 0.28);
  --n4-red: #D32F2F;
  --n4-red-soft: rgba(211, 47, 47, 0.14);

  /* Surfaces */
  --n4-black: #0A0A0A;
  --n4-surface: #141414;
  --n4-surface-2: #1C1C1C;
  --n4-surface-3: #242424;

  /* Text */
  --n4-text: #EDEDED;
  --n4-muted: #A9A9A9;
  --n4-faint: #6E6E6E;

  /* Shape + motion */
  --n4-radius: 16px;
  --n4-radius-sm: 10px;
  --n4-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  --n4-shadow-gold: 0 8px 28px rgba(255, 215, 0, 0.16);
  --n4-ease: cubic-bezier(0.22, 0.9, 0.28, 1);
  --n4-font: 'Pyidaungsu', 'Noto Sans Myanmar', sans-serif;
}

/* ---------- base ---------- */
html { scroll-behavior: smooth; }

body.n4 {
  font-family: var(--n4-font);
  background: var(--n4-black);
  color: var(--n4-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  overflow-x: clip; /* safety net: no sideways page panning */
}

/* content links gold — buttons keep their own text colors */
.n4 a:not(.btn):not(.download-btn):not(.pricing-btn):not(.n4-back):not(.footer-link):not(.header-logo) { color: var(--n4-gold); }
.n4 ::selection { background: var(--n4-gold); color: #0A0A0A; }

/* consistent box model everywhere — kills horizontal page-shift bugs */
*, *::before, *::after { box-sizing: border-box; }

/* ---------- slim sub-page header ---------- */
.n4-subheader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: rgba(10, 10, 10, 0.92);
  border-bottom: 1px solid var(--n4-gold-border);
  position: sticky;
  top: 0;
  z-index: 900;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.n4-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--n4-gold);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 8px 14px;
  border: 1px solid var(--n4-gold-border);
  border-radius: 999px;
  background: var(--n4-gold-soft);
  transition: transform 0.25s var(--n4-ease), background 0.25s, box-shadow 0.25s;
  white-space: nowrap;
}

.n4-back:hover {
  transform: translateX(-3px);
  background: rgba(255, 215, 0, 0.2);
  box-shadow: var(--n4-shadow-gold);
}

.n4-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--n4-gold);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.5px;
  text-decoration: none;
}

.n4-brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(255, 215, 0, 0.45));
}

/* ---------- buttons ---------- */
.n4-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s var(--n4-ease), box-shadow 0.25s;
  font-family: var(--n4-font);
}

.n4-btn-gold {
  background: linear-gradient(135deg, var(--n4-gold) 0%, var(--n4-gold-deep) 100%);
  color: #0A0A0A;
  box-shadow: 0 6px 20px rgba(255, 215, 0, 0.32);
}

.n4-btn-gold:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 10px 30px rgba(255, 215, 0, 0.45);
}

.n4-btn-gold:active { transform: translateY(0) scale(0.99); }

.n4-btn-ghost {
  background: var(--n4-gold-soft);
  color: var(--n4-gold);
  border: 1px solid var(--n4-gold-border);
}

.n4-btn-ghost:hover {
  transform: translateY(-2px);
  background: rgba(255, 215, 0, 0.2);
  box-shadow: var(--n4-shadow-gold);
}

/* ---------- cards ---------- */
.n4-card {
  background: linear-gradient(160deg, var(--n4-surface-2), var(--n4-surface));
  border: 1px solid var(--n4-gold-border);
  border-radius: var(--n4-radius);
  box-shadow: var(--n4-shadow);
  transition: transform 0.3s var(--n4-ease), box-shadow 0.3s, border-color 0.3s;
}

.n4-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--n4-shadow-gold);
  border-color: rgba(255, 215, 0, 0.5);
}

/* ---------- section headings ---------- */
.n4-section-title {
  text-align: center;
  color: var(--n4-gold);
  font-size: 1.7rem;
  margin: 0 0 0.4rem;
}

.n4-section-sub {
  text-align: center;
  color: var(--n4-muted);
  margin: 0 0 2rem;
  font-size: 0.98rem;
}

.n4-divider {
  width: 72px;
  height: 4px;
  margin: 0 auto 1.6rem;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--n4-gold), var(--n4-red));
  box-shadow: 0 2px 10px rgba(255, 215, 0, 0.35);
}

/* ---------- scroll reveal (progressive enhancement) ----------
   site.js adds .js-reveal to <html> only when IntersectionObserver
   exists, so content is never hidden without JS. */
.js-reveal .n4-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.55s var(--n4-ease),
    transform 0.55s var(--n4-ease);
  transition-delay: var(--n4d, 0s);
  will-change: opacity, transform;
}

.js-reveal .n4-reveal.n4-in {
  opacity: 1;
  transform: none;
}

/* fade-only reveal — for elements that already have their own
   transform (e.g. scaled cards), so nothing jumps */
.js-reveal .n4-reveal-fade {
  opacity: 0;
  transition: opacity 0.55s var(--n4-ease);
  transition-delay: var(--n4d, 0s);
  will-change: opacity;
}

.js-reveal .n4-reveal-fade.n4-in {
  opacity: 1;
}

/* ---------- back-to-top ---------- */
.n4-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--n4-gold-border);
  background: linear-gradient(135deg, var(--n4-gold), var(--n4-gold-deep));
  color: #0A0A0A;
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(255, 215, 0, 0.35);
  transition: transform 0.25s var(--n4-ease), box-shadow 0.25s;
  z-index: 950;
}

.n4-top:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(255, 215, 0, 0.5); }
.n4-top.show { display: inline-flex; }

/* ---------- keyframes ---------- */
@keyframes n4-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes n4-fade-up {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: none; }
}

@keyframes n4-spin {
  to { transform: rotate(360deg); }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .js-reveal .n4-reveal { opacity: 1; transform: none; transition: none; }
  .n4-btn-gold::after { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- small screens ---------- */
@media (max-width: 560px) {
  .n4-subheader { padding: 10px 12px; }
  .n4-back { font-size: 0.85rem; padding: 7px 12px; }
  .n4-brand { font-size: 0.95rem; }
  .n4-brand img { width: 28px; height: 28px; }
  .n4-top { right: 16px; bottom: 16px; width: 46px; height: 46px; }
}

/* ---------- skeleton loading ----------
   Slow connections: shimmering placeholders keep the layout
   alive while images / data load. */
@keyframes n4-skel-shimmer {
  from { background-position: 180% 0; }
  to { background-position: -80% 0; }
}

/* image skeleton — shimmering backdrop until the image paints */
img.n4-skel {
  background: linear-gradient(100deg, #141414 30%, #262626 50%, #141414 70%);
  background-size: 200% 100%;
  animation: n4-skel-shimmer 1.5s linear infinite;
}

img.n4-skel.n4-loaded {
  animation: none;
  background: #000;
}

/* text/data skeleton bar */
.n4-skel-bar {
  display: inline-block;
  height: 0.95em;
  border-radius: 6px;
  vertical-align: middle;
  background: linear-gradient(100deg, #1b1b1b 30%, #2c2c2c 50%, #1b1b1b 70%);
  background-size: 200% 100%;
  animation: n4-skel-shimmer 1.4s linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  img.n4-skel, .n4-skel-bar { animation: none; }
}