/* =========================================================
   MedSina — Global UX Enhancements
   Прогресс-бар, кнопка наверх, баннер, navbar, виджет, прелоадер
   ========================================================= */

/* ──────────────── SCROLL PROGRESS BAR ──────────────── */
.ms-progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 100%;
  background: linear-gradient(90deg, #2563eb 0%, #0d9488 50%, #8b5cf6 100%);
  z-index: 9998;
  /* transform вместо width — только compositor, без repaint */
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
  border-radius: 0 2px 2px 0;
}

/* ──────────────── ANNOUNCEMENT BANNER ──────────────── */
.ms-announcement {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  background: linear-gradient(90deg, #1d4ed8 0%, #0d9488 100%);
  color: #fff;
  font-size: 13.5px;
  font-weight: 500;
  text-align: center;
  padding: 9px 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  line-height: 1.3;
}
.ms-announcement a {
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  background: rgba(255,255,255,.18);
  padding: 3px 10px;
  border-radius: 20px;
  transition: background .2s;
  white-space: nowrap;
}
.ms-announcement a:hover { background: rgba(255,255,255,.3) }
.ms-ann-close {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: rgba(255,255,255,.75);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 4px;
  transition: color .2s;
}
.ms-ann-close:hover { color: #fff }
/* Сдвигаем navbar вниз когда баннер показан */
body.has-announcement .navbar { top: 38px !important }
body.has-announcement { padding-top: 38px }

/* ──────────────── NAVBAR GLASS ENHANCEMENT ──────────────── */
.navbar {
  /* Только дешёвые свойства — без backdrop-filter (убивает fps) */
  transition: background-color .25s ease, box-shadow .25s ease !important;
  will-change: background-color, box-shadow;
}
.navbar.nav-scrolled {
  background: rgba(255,255,255,.98) !important;
  box-shadow: 0 2px 16px rgba(15,23,42,.1) !important;
  /* backdrop-filter убран — вызывал repaint при каждом скролле */
}
.navbar.nav-top {
  background: rgba(255,255,255,.85) !important;
  box-shadow: none !important;
}

/* Nav link hover underline */
.nav-links a {
  position: relative !important;
  transition: color .2s !important;
}
.nav-links a::after {
  content: '' !important;
  position: absolute !important;
  bottom: -4px; left: 0; right: 0 !important;
  height: 2px !important;
  background: linear-gradient(90deg, #2563eb, #0d9488) !important;
  transform: scaleX(0) !important;
  transition: transform .25s cubic-bezier(.4,0,.2,1) !important;
  border-radius: 2px !important;
}
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1) !important }

/* ──────────────── BACK TO TOP ──────────────── */
.ms-back-top {
  position: fixed;
  bottom: 96px;
  right: 24px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #0d9488);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(37,99,235,.4);
  opacity: 0;
  transform: translateY(14px) translateZ(0);
  transition: opacity .3s, transform .3s;
  will-change: opacity, transform;
  z-index: 150;
  font-size: 18px;
  line-height: 1;
}
.ms-back-top.ms-visible {
  opacity: 1;
  transform: translateY(0) translateZ(0);
}
.ms-back-top:hover {
  transform: translateY(-2px) translateZ(0);
}

/* ──────────────── FLOATING CHAT WIDGET ──────────────── */
@keyframes ms-pulse-ring {
  0%   { transform: scale(1) translateZ(0); opacity:.4 }
  100% { transform: scale(1.6) translateZ(0); opacity:0 }
}
@keyframes ms-widget-in {
  from { opacity:0; transform:translateY(16px) scale(.9) }
  to   { opacity:1; transform:translateY(0) scale(1) }
}

.ms-chat-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 160;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}
.ms-chat-label {
  background: #fff;
  color: #1e293b;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(15,23,42,.15);
  white-space: nowrap;
  opacity: 0;
  transform: translateX(8px);
  transition: opacity .25s, transform .25s;
  pointer-events: none;
}
.ms-chat-widget:hover .ms-chat-label {
  opacity: 1;
  transform: translateX(0);
}
.ms-chat-btn {
  width: 58px; height: 58px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #0d9488);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37,99,235,.45);
  position: relative;
  font-size: 22px;
  animation: ms-widget-in .5s ease 1.5s both;
  transition: transform .2s;
  text-decoration: none;
  will-change: transform;
  transform: translateZ(0);
}
.ms-chat-btn:hover {
  transform: scale(1.08) translateZ(0);
}
/* Pulse — только transform+opacity, GPU-слой */
.ms-chat-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb80, #0d948880);
  animation: ms-pulse-ring 2.8s ease-out infinite;
  will-change: transform, opacity;
  transform: translateZ(0);
}
.ms-chat-badge {
  position: absolute;
  top: 2px; right: 2px;
  width: 14px; height: 14px;
  background: #10b981;
  border-radius: 50%;
  border: 2px solid #fff;
}

/* ──────────────── PRELOADER ──────────────── */
@keyframes ms-heart-load {
  0%,100% { transform: scale(1) }
  50%      { transform: scale(1.18) }
}
@keyframes ms-loader-dots {
  0%,80%,100% { opacity:.2; transform:scale(.8) }
  40%          { opacity:1;  transform:scale(1) }
}
@keyframes ms-preloader-out {
  to { opacity:0; visibility:hidden; pointer-events:none }
}

.ms-preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0f2027 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  transition: opacity .5s ease, visibility .5s ease;
}
.ms-preloader.ms-loaded {
  animation: ms-preloader-out .55s ease .2s forwards;
}
.ms-preloader-logo {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -.02em;
}
.ms-preloader-logo span {
  background: linear-gradient(90deg, #60a5fa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ms-preloader-heart {
  font-size: 48px;
  animation: ms-heart-load 1.2s ease-in-out infinite;
  filter: drop-shadow(0 0 12px rgba(239,68,68,.5));
}
.ms-loader-dots {
  display: flex;
  gap: 8px;
}
.ms-loader-dots span {
  width: 10px; height: 10px;
  background: linear-gradient(135deg, #60a5fa, #34d399);
  border-radius: 50%;
  animation: ms-loader-dots 1.2s ease infinite;
}
.ms-loader-dots span:nth-child(2) { animation-delay:.15s }
.ms-loader-dots span:nth-child(3) { animation-delay:.30s }

/* ──────────────── DARK MODE BASE ──────────────── */
.ms-dark-toggle {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1.5px solid rgba(15,23,42,.13);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #475569;
  flex-shrink: 0;
  transition: background .2s, border-color .2s, color .2s;
  padding: 0;
}
.ms-dark-toggle:hover {
  background: #f1f5f9;
  border-color: #2563eb;
  color: #2563eb;
}
html.ms-dark .ms-dark-toggle {
  border-color: rgba(255,255,255,.2);
  color: #94a3b8;
}
html.ms-dark .ms-dark-toggle:hover {
  background: rgba(255,255,255,.08);
  color: #60a5fa;
}

html.ms-dark {
  --bg: #0f172a;
  --text: #f1f5f9;
  --border: rgba(255,255,255,.08);
  --card: #1e293b;
  --card-border: rgba(255,255,255,.06);
  filter: none;
}
html.ms-dark body {
  background: #0f172a !important;
  color: #f1f5f9 !important;
}
html.ms-dark .navbar {
  background: rgba(15,23,42,.95) !important;
  border-bottom-color: rgba(255,255,255,.08) !important;
}
html.ms-dark .nav-links a { color: #cbd5e1 !important }
html.ms-dark .nav-links a:hover { color: #60a5fa !important }
html.ms-dark .feature-card,
html.ms-dark .step,
html.ms-dark .persona-card,
html.ms-dark .faq-item {
  background: #1e293b !important;
  border-color: rgba(255,255,255,.07) !important;
  color: #e2e8f0 !important;
}
html.ms-dark .section-title,
html.ms-dark .hero-title,
html.ms-dark h1,html.ms-dark h2,html.ms-dark h3 {
  color: #f1f5f9 !important;
}
html.ms-dark .section-subtitle,
html.ms-dark .hero-subtitle,
html.ms-dark p {
  color: #94a3b8 !important;
}
html.ms-dark .faq { background: #0f172a !important }
html.ms-dark .hero { background: linear-gradient(135deg,#0f172a,#1e3a8a) !important }

/* ──────────────── HIDE UX WIDGETS ON PANEL & ADMIN ──────────────── */
/* Наши элементы не нужны в /panel/ и /admin/ */
body.panel-page .ms-announcement,
body.panel-page .ms-progress-bar,
body.panel-page .ms-back-top,
body.panel-page .ms-chat-widget,
body.panel-page .ms-preloader,
body.admin-page .ms-announcement,
body.admin-page .ms-progress-bar,
body.admin-page .ms-back-top,
body.admin-page .ms-chat-widget,
body.admin-page .ms-preloader {
  display: none !important;
}

/* ──────────────── NAVBAR FIXES ──────────────── */
/* Кнопка "Попробовать бесплатно" — не переносить текст */
.navbar .btn-primary,
.nav-actions .btn-primary {
  white-space: nowrap !important;
  min-width: max-content !important;
}

/* Dark mode toggle — компактный вид в navbar */
.nav-actions .ms-dark-toggle {
  order: -1;
  width: 36px !important;
  height: 36px !important;
  padding: 0 !important;
  border-radius: 50% !important;
  justify-content: center !important;
  font-size: 15px !important;
  border-color: rgba(15,23,42,.12) !important;
  flex-shrink: 0 !important;
}
.navbar .ms-dark-toggle {
  order: unset;
  width: 36px !important;
  height: 36px !important;
  padding: 0 !important;
  border-radius: 50% !important;
  font-size: 15px !important;
  flex-shrink: 0 !important;
}