/* =========================================================
   Main Layout & Base Styles — RTL + Bootstrap-native Sidebar
   Pattern: Desktop sticky (right) + Mobile Offcanvas (right)
   Version: 2.0 - Optimized & Clean
   ========================================================= */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #0ea5ff;
  --border: #e6eaf2;
  --text: #0f172a;
  --muted: #475569;
  --surface: #ffffff;

  --topbarH: 64px;
  --desktop-sidebar-w: 280px;
  --transition-speed: 0.25s;
  --transition-easing: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Base Reset & Typography ---------- */
* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--text);
  font-family: "Estedad", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1, "kern";
  letter-spacing: 0;
  background: radial-gradient(1200px 600px at 20% -10%, #eef6ff, transparent 60%),
    radial-gradient(1200px 600px at 120% 20%, #f6faff, transparent 60%),
    linear-gradient(180deg, #fbfdff 0%, #f6f9ff 100%);
}

/* Typography */
h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.25;
}

h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.35;
}

small,
.small {
  font-weight: 400;
}

code,
kbd,
samp,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.925em;
}

/* =========================================================
   Topbar
   ========================================================= */
.site-topbar {
  position: sticky;
  top: 0;
  z-index: 1030;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: saturate(140%) blur(6px);
  transition: margin var(--transition-speed) var(--transition-easing);
}

.container-fluid > .row.g-0 {
  min-height: calc(100dvh - var(--topbarH, 64px));
}

/* =========================================================
   Desktop Sidebar (Sticky Right)
   ========================================================= */
#desktopSidebar {
  background: #fff;
  border-inline-start: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(2, 6, 23, 0.06);
}

@media (min-width: 768px) {
  #desktopSidebar.col-md-3.col-lg-2 {
    width: var(--desktop-sidebar-w) !important;
    max-width: var(--desktop-sidebar-w) !important;
    flex: 0 0 var(--desktop-sidebar-w) !important;
  }

  #desktopSidebar {
    position: sticky !important;
    top: 0 !important;
    height: calc(100dvh - var(--topbarH, 64px)) !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    scrollbar-width: thin;
    scrollbar-color: #cbd5e1 transparent;
  }

  #desktopSidebar::-webkit-scrollbar {
    width: 6px;
  }

  #desktopSidebar::-webkit-scrollbar-track {
    background: transparent;
  }

  #desktopSidebar::-webkit-scrollbar-thumb {
    background-color: #cbd5e1;
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: content-box;
  }

  #desktopSidebar::-webkit-scrollbar-thumb:hover {
    background-color: #94a3b8;
  }
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px;
  min-height: 100%;
}

/* Desktop Sidebar Push (RTL-aware) */
@media (min-width: 768px) {
  html[data-desktop-sidebar="open"] .site-topbar,
  html[data-desktop-sidebar="open"] #main-content {
    margin-inline-start: var(--desktop-sidebar-w);
  }

  html[data-desktop-sidebar="closed"] .site-topbar,
  html[data-desktop-sidebar="closed"] #main-content {
    margin-inline-start: 0;
  }
}

/* =========================================================
   Mobile Offcanvas (Bootstrap-native)
   ========================================================= */
.offcanvas {
  --bs-offcanvas-width: min(85vw, 320px);
}

.offcanvas.offcanvas-start {
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.22);
  border-inline-start: 1px solid var(--border);
  border-radius: 16px 0 0 16px;
}

/* 🆕 FIX: Mobile Sidebar Scroll */
.offcanvas .offcanvas-body {
  max-height: calc(100dvh - 56px);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: #cbd5e1 transparent;
  padding: 0; /* 🔧 حذف padding پیش‌فرض Bootstrap برای جلوگیری از بیرون‌زدگی */
}

.offcanvas .offcanvas-body::-webkit-scrollbar {
  width: 6px;
}

.offcanvas .offcanvas-body::-webkit-scrollbar-track {
  background: transparent;
}

.offcanvas .offcanvas-body::-webkit-scrollbar-thumb {
  background-color: #cbd5e1;
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: content-box;
}

.offcanvas .offcanvas-body::-webkit-scrollbar-thumb:hover {
  background-color: #94a3b8;
}

.offcanvas:not(:has(.offcanvas-header)) .offcanvas-body {
  max-height: 100dvh;
}

/* 🆕 Smooth Scroll Behavior */
#desktopSidebar,
.offcanvas .offcanvas-body {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  #desktopSidebar,
  .offcanvas .offcanvas-body {
    scroll-behavior: auto;
  }
}

/* =========================================================
   Navigation & Sidebar Components
   ========================================================= */
.nav-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: #334155;
  text-decoration: none;
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover {
  background: #eaf4ff;
  color: #0c4a6e;
}

.nav-link:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.nav .nav-link.active,
.nav-pills .nav-link.active {
  background-color: #eaf4ff;
  color: #0c4a6e;
  font-weight: 600;
}

/* Recent Chats */
.recent {
  background: #f1f5f9;
  padding: 10px;
  border-radius: 10px;
  font-size: 12px;
  color: #475569;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-align: start;
  flex-shrink: 0;
  margin-top: 12px;
  font-weight: 500;
}

.recent:hover {
  background: #e2e8f0;
}

.recent:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* 🆕 Chat History List Scroll */
.chat-history-list {
  max-height: 400px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: #cbd5e1 transparent;
}

.chat-history-list::-webkit-scrollbar {
  width: 5px;
}

.chat-history-list::-webkit-scrollbar-track {
  background: transparent;
}

.chat-history-list::-webkit-scrollbar-thumb {
  background-color: #cbd5e1;
  border-radius: 10px;
}

.chat-history-list::-webkit-scrollbar-thumb:hover {
  background-color: #94a3b8;
}

/* =========================================================
   User Card
   ========================================================= */
.user-card {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-light, #e5e7eb);
  border-radius: 0.75rem;
  background: var(--bg-surface, #fff);
}

.user-card .avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  user-select: none;
}

.user-card .info {
  font-size: 13px;
  line-height: 1.3;
}

.user-card .info .name {
  font-weight: 600;
}

.user-card .info .sub {
  color: #64748b;
}

.user-card--auth {
  background: var(--bg-surface, #fff);
}

.user-card--auth .avatar {
  color: #fff;
  background: linear-gradient(135deg, #06b6d4, #0ea5ff);
}

.user-card--guest {
  background: #f8fafc;
}

.user-card--guest .avatar {
  color: #334155;
  background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
}

/* User Card Buttons */
.user-logout-btn,
.login-google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  border: none;
  background: transparent;
  border-radius: 0.375rem;
  color: #64748b;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-inline-start: auto;
  padding: 0 0.5rem;
}

.user-logout-btn:hover {
  background: #fee2e2;
  color: #dc2626;
}

.login-google-btn {
  background: #fff;
  border: 1px solid #e5e7eb;
}

.login-google-btn:hover {
  background: #f1f5f9;
}

@media (prefers-color-scheme: dark) {
  .user-card--guest {
    background: #0b1220;
  }

  .user-card .info .sub {
    color: #94a3b8;
  }

  .login-google-btn {
    background: transparent;
    border-color: #334155;
    color: #e2e8f0;
  }

  .login-google-btn:hover {
    background: #0b1220;
  }

  .user-logout-btn {
    color: #94a3b8;
  }

  .user-logout-btn:hover {
    background: #7f1d1d;
    color: #f87171;
  }
}

/* =========================================================
   Main Content Panel
   ========================================================= */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.05);
  display: flex;
  flex-direction: column;
  min-height: 320px;
  gap: 8px;
}

/* =========================================================
   Utilities
   ========================================================= */
.hero {
  text-align: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #eaf4ff;
  color: #0369a1;
  border: 1px solid #cfe8ff;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

@media (max-width: 767.98px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.section-title {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #64748b;
  text-transform: uppercase;
  font-weight: 700;
}

.vstack {
  display: flex;
  flex-direction: column;
}

.gap-2 {
  gap: 8px;
}

.mb-2 {
  margin-bottom: 8px;
}

.mt-2 {
  margin-top: 8px;
}

.w-100 {
  width: 100%;
}

/* =========================================================
   Animations
   ========================================================= */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 0.45s ease both;
}

.slide-up {
  animation: slideUp 0.5s var(--transition-easing) both;
}

.bubble-in {
  animation: slideUp 0.35s ease-out both;
}

@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .slide-up,
  .bubble-in {
    animation: none;
  }
}

/* =========================================================
   Focus & Accessibility
   ========================================================= */
button:focus,
select:focus,
textarea:focus,
input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

@media (prefers-contrast: high) {
  .nav-link:hover {
    border: 1px solid var(--primary);
  }
}

/* =========================================================
   Model Selector
   ========================================================= */
.model-selector {
  position: relative;
  font-size: 14px;
  min-width: 200px;
}

.model-selector__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background-color: var(--surface);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: start;
}

.model-selector__trigger:hover {
  border-color: #d0d5dd;
  background-color: #f9fafb;
}

.model-selector__trigger:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.model-selector__selected {
  flex-grow: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}

.model-selector__icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #eee;
  flex-shrink: 0;
}

.model-selector__info {
  overflow: hidden;
}

.model-selector__name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.model-selector__provider {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.model-selector__arrow {
  margin-inline-start: 8px;
  color: var(--muted);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.model-selector.open .model-selector__arrow {
  transform: rotate(180deg);
}

.model-selector__dropdown {
  position: absolute;
  inset-inline: 0;
  inset-block-start: 100%;
  z-index: 9999;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
  list-style: none;
  padding: 6px;
  margin: 8px 0 0 0;
  opacity: 0;
  transform: translateY(10px) scale(0.95);
  visibility: hidden;
  transition: all 0.2s ease;
  max-height: 40vh;
  overflow-y: auto;
}

.model-selector.open .model-selector__dropdown {
  opacity: 1;
  transform: translateY(0) scale(1);
  visibility: visible;
}

.model-selector__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.model-selector__item:hover {
  background-color: #f1f5f9;
}

.model-selector__item.selected {
  background-color: #eaf4ff;
  color: #0c4a6e;
  font-weight: 600;
}

.model-selector__dropdown::-webkit-scrollbar {
  width: 5px;
}

.model-selector__dropdown::-webkit-scrollbar-track {
  background: transparent;
}

.model-selector__dropdown::-webkit-scrollbar-thumb {
  background-color: #e0e6ef;
  border-radius: 10px;
  border: 2px solid transparent;
}

.model-selector__dropdown::-webkit-scrollbar-thumb:hover {
  background-color: #cbd5e1;
}

/* =========================================================
   Legacy Kill-switch (Cleanup Old Sidebar Styles)
   ========================================================= */
.sidebar,
#app-sidebar,
.backdrop,
#backdrop {
  all: unset;
  display: revert;
}

.sidebar,
#app-sidebar {
  position: static !important;
  transform: none !important;
  width: auto !important;
  height: auto !important;
  box-shadow: none !important;
  border: none !important;
  border-radius: 0 !important;
}

.sidebar.open {
  transform: none !important;
}

body.sidebar-open-mobile {
  overflow: auto !important;
}