/**
 * LEFT SLIDER (Ocean Glass Unified)
 * Синхронізовано з header + footer
 */

:root {
  --header-height: 54px;
  --footer-height: 58px;
  --slider-gap: 1px;

  --sidebar-width: 288px;    /* expanded */
  --sidebar-compact: 80px;   /* compact */
  --slider-z: 3000;

  /* Уніфікований розмір лого */
  --logo-size: 58px;

  /* Accent з navigation.php або fallback */
  --ls-accent: var(--page-accent, #1891c3);
  --ls-accent-rgb: 24, 145, 195;

  /* Уніфіковані glass змінні */
  --glass-bg: rgba(255,255,255,0.54);
  --glass-bg-hover: rgba(255,255,255,0.68);
  --glass-blur: 18px;
  --glass-saturate: saturate(180%);
  --glass-border: rgba(24,145,195,0.18);
  --glass-border-accent: rgba(64,224,208,0.3);
  --glass-shadow: 0 4px 12px rgba(24,145,195,0.12), 0 2px 6px rgba(64,224,208,0.08);

  --radius-sm: 0.55rem;
  --radius-md: 0.8rem;
  --radius-xl: 1.25rem;

  --text-strong: #1f2937;
  --text-muted: #6b7280;

  /* Transitions */
  --transition-duration: 300ms;
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Anti-FOUC */
html[data-leftslider-init="0"] {
  --sidebar-transition-duration: 0ms !important;
}

html[data-leftslider-init="0"] #leftSlider {
  transform: translateX(-110%) !important;
}

/* ==== RAIL BUTTON ==== */
.left-slider-rail {
  position: fixed;
  left: 10px;
  top: calc(var(--header-height) + var(--slider-gap));
  bottom: calc(var(--footer-height) + var(--slider-gap));
  width: 56px;
  z-index: calc(var(--slider-z) - 2);
  display: flex;
  align-items: flex-start;
  padding-top: 10px;
  pointer-events: none;
}

.rail-btn {
  pointer-events: auto;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  
  border: 1px solid color-mix(in oklab, var(--ls-accent) 25%, transparent);
  background: color-mix(in oklab, #fff 78%, var(--ls-accent) 8%);
  box-shadow: 0 10px 24px color-mix(in oklab, var(--ls-accent) 18%, transparent);
  
  transition: transform 0.12s ease, background 0.18s, border-color 0.18s;
}

.rail-btn:hover {
  transform: translateY(-1px);
  background: color-mix(in oklab, #fff 84%, var(--ls-accent) 12%);
  border-color: color-mix(in oklab, var(--ls-accent) 38%, transparent);
}

/* Backdrop */
.left-slider-backdrop {
  position: fixed;
  left: 0;
  right: 0;
  top: calc(var(--header-height) + var(--slider-gap));
  bottom: calc(var(--footer-height) + var(--slider-gap));
  background: transparent !important;
  z-index: calc(var(--slider-z) - 1);
  display: none;
  pointer-events: none;
}

.left-slider-backdrop.is-open {
  display: block;
}

.left-slider-backdrop.clickcatch {
  pointer-events: auto;
}

/* ==== КОНТЕЙНЕР СЛАЙДЕРА ==== */
.left-slider {
  position: fixed;
  left: 0;
  z-index: var(--slider-z);
  
  /* Позиціонування відносно header/footer */
  top: calc(var(--header-height) + var(--slider-gap));
  bottom: calc(var(--footer-height) + var(--slider-gap));
  height: calc(100vh - var(--header-height) - var(--footer-height) - 2*var(--slider-gap));
  
  width: var(--sidebar-compact);
  
  /* Уніфікований glass effect */
  background:
    radial-gradient(120% 100% at -10% -10%, color-mix(in oklab, var(--ls-accent) 22%, transparent) 0%, transparent 55%),
    var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) var(--glass-saturate);
  -webkit-backdrop-filter: blur(var(--glass-blur)) var(--glass-saturate);
  
  /* CRITICAL: Радіуси - праві заокруглені, лівих немає */
  border-radius: 0 var(--radius-xl) var(--radius-xl) 0;
  
  /* Borders */
  border: 1px solid var(--glass-border);
  border-left: none;
  border-right: 2px solid var(--glass-border-accent);
  
  /* Shadow */
  box-shadow: var(--glass-shadow);
  
  /* Layout */
  display: flex;
  flex-direction: column;
  overflow: hidden;
  
  /* Початковий стан - схований */
  transform: translateX(-110%);
  
  /* Smooth transitions */
  transition: 
    width var(--transition-duration) var(--transition-timing),
    transform var(--transition-duration) var(--transition-timing),
    border-radius var(--transition-duration) var(--transition-timing),
    top 150ms, bottom 150ms, height 150ms;
  
  /* GPU optimization */
  will-change: transform, width;
}

/* CRITICAL: Коли відкритий - прибираємо праві радіуси для злиття з header/footer */
.left-slider[data-mode="expanded"],
.left-slider[data-mode="overlay"] {
  border-top-right-radius: 0 !important;
  border-bottom-right-radius: 0 !important;
  border-right-width: 0;
}

/* Connector lines */
.left-slider[data-mode="expanded"]::after,
.left-slider[data-mode="overlay"]::after {
  content: '';
  position: absolute;
  right: -2px;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom,
    transparent,
    var(--glass-border-accent) 5%,
    var(--glass-border-accent) 95%,
    transparent
  );
  opacity: 0.6;
  pointer-events: none;
}

/* ==== ШАПКА СЛАЙДЕРА ==== */
.left-slider__top {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.6rem 0.45rem 0.55rem;
  
  border-bottom: 1px solid var(--glass-border);
  background: color-mix(in oklab, white 30%, transparent);
  
  transition: padding 0.2s ease;
}

.left-slider__brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text-strong);
  min-width: 0;
  line-height: 1;
}

.left-slider__logo {
  width: var(--logo-size);
  height: var(--logo-size);
  border-radius: 50%;
  object-fit: contain;
  display: block;
  
  box-shadow: 0 2px 10px color-mix(in oklab, var(--ls-accent) 18%, transparent);
  
  transform: translateZ(0);
  backface-visibility: hidden;
}

.left-slider__brand-text {
  font-weight: 800;
  letter-spacing: 0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* EDGE TOGGLE - кнопка розгортання */
.ls-edge-toggle {
  position: absolute;
  top: 18px;
  right: -18px;
  
  width: 28px;
  height: 28px;
  border-radius: 50%;
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  background: var(--ls-accent);
  color: #fff;
  border: 0;
  box-shadow: 0 6px 18px rgba(0,0,0,0.18);
  cursor: pointer;
  
  transition: background 0.2s ease, box-shadow 0.2s ease;
  z-index: calc(var(--slider-z) + 1);
}

.ls-edge-toggle:hover {
  background: color-mix(in oklab, var(--ls-accent) 86%, white);
  box-shadow: 0 8px 22px rgba(0,0,0,0.22);
}

.ls-edge-toggle i {
  font-size: 1rem;
  display: block;
  width: 1em;
  height: 1em;
  line-height: 1em;
  text-align: center;
  
  transition: transform 0.25s ease;
}

/* Поворот стрілки коли відкритий */
.left-slider[data-mode="expanded"] .ls-edge-toggle i,
.left-slider[data-mode="overlay"] .ls-edge-toggle i {
  transform: rotate(180deg);
}

/* ==== ПОШУК ==== */
.left-slider__search {
  position: relative;
  padding: 0.5rem 0.6rem 0;
}

.left-slider__search i {
  position: absolute;
  left: 1.1rem;
  top: 1.1rem;
  opacity: 0.65;
}

.left-slider__search input {
  width: 100%;
  height: 38px;
  padding: 0 12px 0 36px;
  border-radius: 12px;
  
  border: 1px solid var(--glass-border);
  outline: none;
  background: rgba(255,255,255,0.65);
  
  transition: border 0.15s, box-shadow 0.15s;
}

.left-slider__search input:focus {
  border-color: color-mix(in oklab, var(--ls-accent) 80%, transparent);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--ls-accent) 22%, transparent);
}

/* ==== СПИСОК ==== */
.left-slider__scroll {
  height: 100%;
  overflow: auto;
  padding: 0.45rem 0.35rem 0.9rem;
  
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.left-slider__scroll::-webkit-scrollbar {
  display: none;
}

.left-slider__nav {
  padding: 0.55rem 0.45rem 0.8rem;
}

.left-slider__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.2rem;
}

.left-slider__item {
  border-radius: var(--radius-md);
}

/* ==== ЛІНКИ: Індивідуальні кольори як у головному меню ==== */
.left-slider__link {
  --item-color: var(--link-accent, var(--ls-accent));

  display: grid;
  grid-template-columns: 2.0em 1fr auto;
  align-items: center;
  gap: 0.7em;
  
  padding: 0.56rem 0.7rem;
  border-radius: 14px;
  
  color: var(--text-strong);
  text-decoration: none;
  
  background: rgba(255,255,255,0.55);
  border: 1px solid var(--glass-border);
  
  position: relative;
  overflow: hidden;
  
  transition: 
    transform 0.12s,
    background 0.18s ease,
    border-color 0.18s,
    color 0.18s,
    box-shadow 0.18s;
}

/* Акцентна смужка зліва */
.left-slider__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 3px;
  
  background: color-mix(in oklab, var(--item-color) 85%, transparent);
  transform: scaleY(0);
  transform-origin: top;
  
  transition: transform 0.18s ease;
}

/* HOVER - той самий тон, що й у tabs */
.left-slider__link:hover {
  background: color-mix(in oklab, var(--item-color) 12%, white);
  border-color: color-mix(in oklab, var(--item-color) 28%, transparent);
  color: var(--text-strong);
  box-shadow: 0 6px 16px color-mix(in oklab, var(--item-color) 18%, transparent);
  transform: translateY(-1px);
}

.left-slider__link:hover::before {
  transform: scaleY(1);
}

.left-slider__link i {
  text-align: center;
  opacity: 0.95;
}

.left-slider__text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Badge */
.left-slider__link .badge {
  margin-left: 0.35rem;
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  
  font-size: 0.72rem;
  line-height: 1;
  
  background: color-mix(in oklab, var(--item-color) 75%, #fff 5%);
  color: #fff;
  border: 1px solid color-mix(in oklab, var(--item-color) 65%, transparent);
}

/* Active - градієнт як у tabs */
.left-slider__item.is-active .left-slider__link {
  background: linear-gradient(135deg, 
    var(--item-color) 0%,
    color-mix(in srgb, var(--item-color) 85%, #000) 100%
  );
  color: #fff;
  border-color: var(--item-color);
  box-shadow: 
    0 4px 6px rgba(0,0,0,0.08),
    0 0 20px color-mix(in oklab, var(--item-color) 35%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.25);
}

.left-slider__item.is-active .left-slider__link i {
  color: #fff;
  opacity: 1;
}

.left-slider__item.is-active .left-slider__link::before {
  transform: scaleY(1);
  background: #fff;
}

.left-slider__item.is-active .left-slider__link .badge {
  background: linear-gradient(135deg, 
    rgba(255,255,255,0.95), 
    rgba(255,255,255,0.85)
  );
  color: var(--item-color);
  border-color: rgba(255,255,255,0.75);
}

/* ========================= ПІДМЕНЮ ========================= */
.submenu {
  display: none;
  margin: 0.28rem 0.15rem 0.5rem;
  padding: 0.35rem 0.15rem 0.1rem 2.15rem;
  border-left: 2px dashed color-mix(in oklab, var(--ls-accent) 18%, transparent);
}

.left-slider[data-mode="expanded"] .has-submenu.open > .submenu,
.left-slider[data-mode="overlay"] .has-submenu.open > .submenu {
  display: block;
}

.submenu li {
  list-style: none;
  margin: 0.18rem 0;
}

.submenu li a {
  --item-color: var(--link-accent, var(--ls-accent));
  
  display: grid;
  grid-template-columns: 1.2em 1fr;
  align-items: center;
  gap: 0.55em;
  
  padding: 0.42rem 0.6rem;
  border-radius: 12px;
  
  background: rgba(255,255,255,0.48);
  border: 1px solid var(--glass-border);
  
  color: var(--text-strong);
  text-decoration: none;
  font-size: 0.92rem;
  
  transition: 
    background 0.14s ease,
    border-color 0.14s ease,
    color 0.14s ease,
    transform 0.1s,
    box-shadow 0.14s;
}

.submenu li a:hover {
  background: color-mix(in oklab, var(--item-color) 14%, white);
  border-color: color-mix(in oklab, var(--item-color) 28%, transparent);
  transform: translateX(1px);
  box-shadow: 0 6px 14px color-mix(in oklab, var(--item-color) 16%, transparent);
}

.submenu li a i {
  opacity: 0.9;
}

.submenu li a.active {
  color: #fff;
  border-color: var(--item-color);
  background: linear-gradient(135deg, 
    var(--item-color) 0%,
    color-mix(in srgb, var(--item-color) 85%, #000) 100%
  );
  box-shadow: 
    0 6px 14px color-mix(in oklab, var(--item-color) 22%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.25);
}

.has-submenu > a .submenu-arrow {
  margin-left: auto;
  transition: transform 0.18s;
  opacity: 0.85;
}

.has-submenu.open > a .submenu-arrow {
  transform: rotate(180deg);
}

/* Реклама */
.left-slider-ad {
  display: block;
  margin: 0.8rem 0.7rem 0;
  padding: 0.65rem;
  
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.52);
  box-shadow: 0 4px 18px rgba(24,33,54,0.08);
  
  max-height: clamp(140px, 28vh, 360px);
  overflow: auto;
  
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.left-slider-ad::-webkit-scrollbar {
  display: none;
}

.ad-skeleton {
  display: grid;
  gap: 0.45rem;
}

.ad-line {
  height: 12px;
  border-radius: 8px;
  background: linear-gradient(90deg, rgba(0,0,0,0.06), rgba(0,0,0,0.02));
}

.ad-line.w60 { width: 60%; }
.ad-line.w75 { width: 75%; }
.ad-line.w90 { width: 90%; }

/* ========================= СТАНИ ========================= */
.left-slider[data-mode="hidden"] {
  transform: translateX(-110%) !important;
  width: var(--sidebar-compact) !important;
  pointer-events: none;
}

.left-slider[data-mode="compact"] {
  width: var(--sidebar-compact) !important;
  transform: translateX(0) !important;
}

.left-slider[data-mode="expanded"] {
  width: var(--sidebar-width) !important;
  transform: translateX(0) !important;
}

/* Overlay: не на весь екран, а ~80% або стандарт */
.left-slider[data-mode="overlay"] {
  width: min(var(--sidebar-width), 82vw) !important;
  max-width: 88vw !important;
  left: 0 !important;
  right: auto !important;
  transform: translateX(0) !important;
}

/* Backdrop для відкритих */
.left-slider[data-mode="expanded"] ~ .left-slider-backdrop,
.left-slider[data-mode="overlay"] ~ .left-slider-backdrop {
  display: block !important;
  pointer-events: auto !important;
}

/* ===== COMPACT ===== - центроване лого, без зміни розміру */
.left-slider[data-mode="compact"] .left-slider__top {
  padding: 0.4rem 0 0.35rem;
}

.left-slider[data-mode="compact"] .left-slider__brand {
  width: 100%;
  justify-content: center;
  gap: 0.5rem;
  margin: 0 auto;
}

.left-slider[data-mode="compact"] .left-slider__brand-text {
  display: none !important;
}

.left-slider[data-mode="compact"] .left-slider__search,
.left-slider[data-mode="compact"] .left-slider__text,
.left-slider[data-mode="compact"] .submenu,
.left-slider[data-mode="compact"] .submenu-arrow {
  display: none !important;
}

.left-slider[data-mode="compact"] .left-slider__list {
  gap: 0.5rem;
  padding-top: 0.25rem;
}

.left-slider[data-mode="compact"] .left-slider__link {
  background: transparent;
  border: 0;
  padding: 0.12rem 0;
  grid-template-columns: 1fr !important;
  justify-items: center;
}

.left-slider[data-mode="compact"] .left-slider__link::before {
  display: none;
}

.left-slider[data-mode="compact"] .left-slider__link i {
  --item-color: var(--link-accent, var(--ls-accent));
  
  width: 48px;
  height: 48px;
  line-height: 48px;
  font-size: 1.08rem;
  border-radius: 50%;
  
  background: rgba(255,255,255,0.72);
  border: 1px solid color-mix(in oklab, var(--item-color) 30%, transparent);
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  box-shadow: 0 2px 10px color-mix(in oklab, var(--item-color) 12%, transparent);
  
  transition: 
    transform 0.12s,
    background 0.14s,
    border-color 0.14s,
    color 0.14s,
    box-shadow 0.14s;
  
  color: var(--text-strong);
}

.left-slider[data-mode="compact"] .left-slider__link:hover i {
  transform: translateY(-1px);
  background: var(--item-color);
  color: #fff;
  border-color: var(--item-color);
  box-shadow: 0 4px 16px color-mix(in oklab, var(--item-color) 28%, transparent);
}

.left-slider[data-mode="compact"] .left-slider__item.is-active .left-slider__link i {
  background: linear-gradient(135deg, 
    var(--item-color) 0%,
    color-mix(in srgb, var(--item-color) 80%, #000) 100%
  );
  color: #fff;
  border-color: var(--item-color);
  box-shadow: 
    0 4px 16px color-mix(in oklab, var(--item-color) 28%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.25);
}

.left-slider[data-mode="compact"] .left-slider-ad {
  display: none !important;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] .left-slider,
body.dark-mode .left-slider {
  --text-strong: #e8eef7;
  --text-muted: #9fb1c2;
  
  background:
    radial-gradient(120% 100% at -10% -10%, color-mix(in oklab, var(--ls-accent) 22%, transparent) 0%, transparent 55%),
    rgba(24,33,54,0.58);
  border-color: rgba(39,55,86,0.33);
  box-shadow: 
    6px 0 28px rgba(0,0,0,0.22),
    inset -12px 0 22px rgba(0,0,0,0.18),
    inset 0 1px 0 rgba(255,255,255,0.08);
}

[data-theme="dark"] .left-slider__top {
  background: rgba(24,33,54,0.45);
}

[data-theme="dark"] .ls-edge-toggle {
  background: color-mix(in oklab, var(--ls-accent) 78%, rgba(24,33,54,0.85));
}

[data-theme="dark"] .left-slider__search input {
  background: rgba(24,33,54,0.65);
  border-color: rgba(39,55,86,0.35);
  color: #e8eef7;
}

[data-theme="dark"] .left-slider .left-slider__link:hover,
body.dark-mode .left-slider .left-slider__link:hover {
  background: color-mix(in oklab, var(--item-color) 16%, rgba(24,33,54,0.75));
  border-color: color-mix(in oklab, var(--item-color) 35%, transparent);
  color: #fff;
}

[data-theme="dark"] .left-slider__link {
  background: rgba(24,33,54,0.60);
  border-color: rgba(39,55,86,0.33);
  color: #e8eef7;
}

[data-theme="dark"] .submenu {
  border-left-color: rgba(255,255,255,0.16);
}

[data-theme="dark"] .submenu li a {
  background: rgba(24,33,54,0.55);
  border-color: rgba(39,55,86,0.33);
  color: #e8eef7;
}

[data-theme="dark"] .submenu li a:hover {
  background: color-mix(in oklab, var(--item-color) 18%, rgba(24,33,54,0.75));
  border-color: color-mix(in oklab, var(--item-color) 45%, transparent);
}

[data-theme="dark"] .submenu li a.active {
  background: linear-gradient(135deg, 
    var(--item-color) 0%,
    color-mix(in srgb, var(--item-color) 85%, #000) 100%
  );
  border-color: color-mix(in oklab, var(--item-color) 60%, transparent);
  color: #fff;
}

[data-theme="dark"] .left-slider-ad {
  background: rgba(24,33,54,0.55);
  border-color: rgba(39,55,86,0.33);
  box-shadow: 0 4px 18px rgba(0,0,0,0.22);
}

/* ===== АДАПТИВ ===== */
@media (max-width: 650px) {
  .left-slider__brand-text {
    display: none;
  }
  
  .left-slider__top {
    padding: 0.4rem;
  }
}

/* Rail-іконка обертається, коли слайдер відкрито */
.left-slider[data-mode="expanded"] ~ .left-slider-rail .rail-btn i,
.left-slider[data-mode="overlay"] ~ .left-slider-rail .rail-btn i {
  transform: rotate(180deg);
  transition: transform 0.25s ease;
}

/* ===== Focus states (accessibility) ===== */
.left-slider *:focus {
  outline: none;
  box-shadow: 
    0 0 0 3px rgba(64,224,208,0.3),
    0 0 12px rgba(64,224,208,0.4);
  border-radius: var(--radius-sm);
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  .left-slider,
  .left-slider__link,
  .submenu li a,
  .ls-edge-toggle {
    transition: none !important;
    animation: none !important;
  }
}