/* css/layout.css - the app shell.

   <html data-auth="out">  visitors: top bar (brand, Sign in, Create
                           account, theme) at every width.
   <html data-auth="in">   members:
     >= 1024px  fixed sidebar (nav with icons + badges, credits card, user
                row); no top bar.
     <  1024px  top bar (brand, credits pill, theme) + bottom tab bar; the
                sidebar becomes a drawer opened from the tab bar's Menu.

   data-auth is set before first paint by theme-init.js (from the stored
   session) and confirmed by auth-nav.js. */

/* ── Brand ────────────────────────────────────────────────────────────── */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  background: var(--gradient-brand);
  background-size: 160% 160%;
  color: var(--color-on-gradient);
  box-shadow: 0 8px 18px -8px var(--color-glow), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  animation: gradient-pan 8s ease-in-out infinite alternate;
  transition: transform 500ms var(--ease-spring);
}
.brand__mark svg { width: 18px; height: 18px; }
.brand:hover .brand__mark { transform: rotate(180deg); }
@keyframes gradient-pan { from { background-position: 0% 50%; } to { background-position: 100% 50%; } }

.brand__name { font-size: 1.1875rem; font-weight: 700; letter-spacing: -0.02em; }

/* ── Icon buttons + theme switch ──────────────────────────────────────── */

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.icon-button:hover { color: var(--color-accent); background: var(--color-hover); }
.icon-button:active { transform: scale(0.9); }

:root[data-theme="dark"] .theme-toggle__sun,
:root:not([data-theme="dark"]) .theme-toggle__moon { display: none; }
/* The switch turns its icon when it is used. */
.theme-toggle .icon { transition: transform 500ms var(--ease-spring); }
.theme-toggle:hover .icon { transform: rotate(-25deg) scale(1.1); }

/* ── Language menu (js/core/language-menu.js) ─────────────────────────── */

.lang-menu { position: relative; }

.lang-menu__button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 8px 0 9px;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.lang-menu__button:hover,
.lang-menu.is-open .lang-menu__button { color: var(--color-ink); background: var(--color-hover); }
.lang-menu__code { min-width: 2ch; color: var(--color-ink); font-variant-numeric: tabular-nums; }
.lang-menu__chevron { opacity: 0.7; transition: transform var(--transition-fast); }
.lang-menu.is-open .lang-menu__chevron { transform: rotate(180deg); }

.lang-menu__list {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 60;
  min-width: 204px;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--highlight);
  transform-origin: top right;
  animation: lang-menu-in 260ms var(--ease-spring);
}
.lang-menu__list[hidden] { display: none; }
@keyframes lang-menu-in { from { opacity: 0; transform: translateY(-8px) scale(0.92); } }

.lang-menu__item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 40px;
  padding: 0 10px;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font: inherit;
  font-size: var(--font-size-sm);
  text-align: left;
  cursor: pointer;
}
.lang-menu__item:hover,
.lang-menu__item:focus-visible { background: var(--color-hover); color: var(--color-ink); outline: none; }
.lang-menu__item:focus-visible { box-shadow: inset 0 0 0 2px var(--color-accent); }
.lang-menu__check { color: var(--color-accent); visibility: hidden; }
.lang-menu__item[aria-checked="true"] { color: var(--color-ink); font-weight: 700; background: var(--gradient-soft); }
.lang-menu__item[aria-checked="true"] .lang-menu__check { visibility: visible; }
.lang-menu__name { flex: 1; }
.lang-menu__short { color: var(--color-text-subtle); font-size: var(--font-size-xs); font-weight: 500; letter-spacing: 0.04em; }

/* Sidebar head: brand left, compact switcher right. */
.sidebar__head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.lang-menu--compact .lang-menu__chevron { display: none; }
.lang-menu--compact .lang-menu__button { padding: 0 8px; }

/* ── Top bar ──────────────────────────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: var(--header-height);
  padding: 0 max(var(--space-5), calc((100% - var(--wide-width)) / 2 + var(--space-5)));
  padding-top: env(safe-area-inset-top);
  box-sizing: content-box;
  background: var(--color-scrim);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.topbar__end {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.topbar__link {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 700;
}
.topbar__link:hover { color: var(--color-ink); background: var(--color-hover); text-decoration: none; }

.credit-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 36px;
  padding: 0 13px 0 5px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-ink);
  font-size: 0.9375rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  box-shadow: var(--shadow-sm);
  transition: transform 300ms var(--ease-spring), box-shadow var(--transition-base);
}
.credit-pill:hover { text-decoration: none; transform: translateY(-1px); box-shadow: var(--shadow-glow); }
/* The coin: the icon on a gradient disc. */
.credit-pill .icon {
  box-sizing: content-box;
  padding: 5px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: var(--color-on-gradient);
  box-shadow: 0 3px 8px -2px var(--color-glow);
}
.credit-pill:hover .icon { animation: coin-flip 700ms var(--ease-out); }

/* ── Sidebar ──────────────────────────────────────────────────────────── */

.sidebar {
  display: none;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-4) var(--space-3);
  background: color-mix(in srgb, var(--color-bg) 78%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-right: 1px solid var(--color-border);
}

.sidebar__brand { padding: 4px 8px; }

.app-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.app-nav a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 42px;
  padding: 0 12px;
  border-radius: 13px;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  font-weight: 600;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.app-nav a .icon { color: var(--color-text-subtle); transition: color var(--transition-fast), transform 360ms var(--ease-spring); }
.app-nav a:hover { color: var(--color-ink); background: var(--color-hover); text-decoration: none; }
.app-nav a:hover .icon { color: var(--color-accent); transform: scale(1.15) rotate(-6deg); }

/* Current page: a tinted pill with a gradient bar that slides in. */
.app-nav a[aria-current="page"] {
  color: var(--color-ink);
  background: var(--gradient-soft), var(--color-bg);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--aurora-1) 22%, transparent), var(--shadow-xs);
}
.app-nav a[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 9px;
  bottom: 9px;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background: var(--gradient-brand);
  box-shadow: 0 0 12px var(--color-glow);
  animation: nav-bar-in 420ms var(--ease-spring) both;
}
@keyframes nav-bar-in { from { transform: scaleY(0); opacity: 0; } }
.app-nav a[aria-current="page"] .icon { color: var(--color-accent); }

.app-nav__rule {
  height: 1px;
  margin: var(--space-2) 10px;
  border: 0;
  background: var(--color-border);
}

.sidebar__footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: auto;
}

/* The balance, as the one gradient object in the sidebar. */
.credit-card {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 18px 16px;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
  background-size: 160% 160%;
  color: var(--color-on-gradient);
  box-shadow: 0 16px 32px -14px var(--color-glow), inset 0 1px 0 rgba(255, 255, 255, 0.28);
  animation: gradient-pan 9s ease-in-out infinite alternate;
  transition: transform 320ms var(--ease-spring);
}
.credit-card::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 150px;
  height: 150px;
  right: -56px;
  top: -70px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}
.credit-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.28) 50%, transparent 70%);
  transform: translateX(-120%);
  animation: card-shine 5s ease-in-out 1.5s infinite;
}
@keyframes card-shine { 0%, 70% { transform: translateX(-120%); } 100% { transform: translateX(120%); } }
.credit-card:hover { text-decoration: none; transform: translateY(-2px) scale(1.015); }

.credit-card__label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.credit-card__value {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.user-row {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 48px;
  padding: 0 0 0 4px;
}
.user-row:empty { display: none; }

.user-row__profile {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--color-ink);
}
.user-row__profile:hover { text-decoration: none; background: var(--color-hover); }

.user-row__text { display: flex; flex-direction: column; min-width: 0; line-height: 1.25; }
.user-row__name,
.user-row__handle { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-row__name { font-size: var(--font-size-sm); font-weight: 700; }
.user-row__handle { color: var(--color-text-subtle); font-size: var(--font-size-xs); }

.user-row__actions { display: flex; flex-shrink: 0; }

/* ── Tab bar (members, small screens) ─────────────────────────────────── */

.tabbar { display: none; }

/* ── Main + footer ────────────────────────────────────────────────────── */

.app-main {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-5) var(--space-10);
  min-height: calc(100vh - var(--header-height) - 72px);
}

/* Theme switch: the new theme opens as a circle from the switch
   (View Transitions, where the browser has them - js/core/theme.js). */
::view-transition-old(root),
::view-transition-new(root) { animation: none; mix-blend-mode: normal; }
::view-transition-new(root) { animation: theme-reveal 620ms var(--ease-out); }
@keyframes theme-reveal {
  from { clip-path: circle(0 at var(--reveal-x, 50%) var(--reveal-y, 0%)); }
  to { clip-path: circle(150vmax at var(--reveal-x, 50%) var(--reveal-y, 0%)); }
}

.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) max(var(--space-5), calc((100% - var(--wide-width)) / 2 + var(--space-5)));
  padding-bottom: max(var(--space-5), env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
  color: var(--color-text-subtle);
  font-size: var(--font-size-xs);
}
.app-footer p { margin: 0; }
.app-footer a { color: var(--color-text-muted); }

.scrim { display: none; }

/* ══ Members: wide screens - sidebar layout ═══════════════════════════ */

@media (min-width: 1024px) {
  :root[data-auth="in"] .topbar { display: none; }

  :root[data-auth="in"] .sidebar {
    display: flex;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 20;
    width: var(--sidebar-width);
    overflow-y: auto;
  }

  :root[data-auth="in"] .app-main {
    max-width: none;
    margin: 0 0 0 var(--sidebar-width);
    padding: var(--space-8) clamp(var(--space-5), 4vw, var(--space-8)) var(--space-10);
    min-height: calc(100vh - 72px);
    overflow-x: clip; /* full-bleed page decorations stop at the sidebar */
  }

  /* Pages read centered in the space beside the sidebar. */
  :root[data-auth="in"] .app-main > * { margin-left: auto; margin-right: auto; }

  :root[data-auth="in"] .app-footer {
    margin-left: var(--sidebar-width);
    padding-left: clamp(var(--space-5), 4vw, var(--space-8));
    padding-right: clamp(var(--space-5), 4vw, var(--space-8));
  }
}

/* ══ Members: small screens - top bar + tab bar + drawer ══════════════ */

@media (max-width: 1023.98px) {
  :root[data-auth="in"] .sidebar {
    display: flex;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 50;
    width: min(300px, 86vw);
    padding-top: calc(var(--space-4) + env(safe-area-inset-top));
    padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom));
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: translateX(-104%);
    visibility: hidden;
    transition: transform 260ms cubic-bezier(0.2, 0.7, 0.2, 1), visibility 0s linear 260ms;
  }

  :root[data-auth="in"] .is-menu-open .sidebar {
    transform: none;
    visibility: visible;
    transition: transform 260ms cubic-bezier(0.2, 0.7, 0.2, 1);
  }

  :root[data-auth="in"] .scrim:not([hidden]) {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 45;
    background: rgba(0, 0, 0, 0.42);
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
  }

  :root[data-auth="in"] .app-nav a { height: 44px; font-size: var(--font-size-base); }

  /* Six labelled tabs share the width by the length of their labels, so
     long words (დავალებები, Уведомления) get room and short ones give it
     up; the round Messages button in the middle keeps a fixed slot. */
  :root[data-auth="in"] .tabbar {
    display: flex;
    position: fixed;
    inset: auto 0 0 0;
    z-index: 30;
    height: var(--tabbar-height);
    padding-bottom: env(safe-area-inset-bottom);
    box-sizing: content-box;
    background: var(--color-scrim);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    backdrop-filter: saturate(180%) blur(16px);
    border-top: 1px solid var(--color-border);
  }

  .tabbar a,
  .tabbar button {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: 0;
    background: none;
    border: 0;
    color: var(--color-text-subtle);
    font: inherit;
    font-size: 0.71875rem;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }
  .tabbar :is(a, button) .icon {
    box-sizing: content-box;
    padding: 4px 11px;
    border-radius: 14px;
    transition: transform 360ms var(--ease-spring), background-color var(--transition-fast), color var(--transition-fast);
  }
  .tabbar :is(a, button):active .icon { transform: scale(0.86); }
  .tabbar a:hover { text-decoration: none; }
  /* Labels never spill into the next tab, whatever the language. */
  .tabbar :is(a, button) > span:not(.nav-badge):not(.tabbar__avatar) {
    max-width: calc(100% - 4px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  /* Label sizes measured so every label fits whole, in every language,
     down to 320 px. */
  .tabbar :is(a, button) .icon { padding: 4px 9px; }
  :lang(ka) .tabbar :is(a, button) { font-size: 0.6rem; }
  :lang(ru) .tabbar :is(a, button) { font-size: 0.65rem; }
  @media (max-width: 380px) {
    :lang(ka) .tabbar :is(a, button) { font-size: 0.5625rem; }
    :lang(ru) .tabbar :is(a, button) { font-size: 0.6rem; }
    .tabbar :is(a, button) .icon { padding: 4px 7px; }
  }
  @media (max-width: 340px) {
    .tabbar :is(a, button) { font-size: 0.625rem; }
    :lang(ka) .tabbar :is(a, button) { font-size: 0.52rem; }
    :lang(ru) .tabbar :is(a, button) { font-size: 0.5625rem; }
    .tabbar :is(a, button) .icon { padding: 4px 5px; }
    .tabbar :is(a, button) > span:not(.nav-badge):not(.tabbar__avatar) { max-width: 100%; }
  }
  .tabbar a[aria-current="page"],
  .tabbar button[aria-expanded="true"] { color: var(--color-ink); font-weight: 700; }
  /* The current tab's icon sits on a gradient pill that springs in. */
  .tabbar a[aria-current="page"] .icon {
    stroke-width: 2.2;
    background: var(--gradient-brand);
    color: var(--color-on-gradient);
    box-shadow: 0 8px 16px -8px var(--color-glow);
    animation: tab-pop 480ms var(--ease-spring) both;
  }
  @keyframes tab-pop { from { transform: scale(0.6) translateY(4px); opacity: 0.4; } }

  /* Profile tab: the member's photo in a ring that turns into the
     gradient when the profile is open. */
  .tabbar__avatar { display: flex; align-items: center; justify-content: center; height: 30px; }
  .tabbar__photo {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 3.5px var(--color-border-strong);
    transition: transform 360ms var(--ease-spring), box-shadow var(--transition-base);
  }
  .tabbar__profile:active .tabbar__photo { transform: scale(0.86); }
  .tabbar__profile[aria-current="page"] .tabbar__photo {
    box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--aurora-2), 0 8px 16px -6px var(--color-glow);
    animation: tab-pop 480ms var(--ease-spring) both;
  }

  /* Messages: a raised round gradient button in the middle of the bar,
     with the unread count on its shoulder. */
  .tabbar .tabbar__center { flex: 0 0 64px; overflow: visible; }
  .tabbar__center .tabbar__orb {
    display: grid;
    place-items: center;
    width: 56px;
    height: 56px;
    margin-top: -22px;
    border-radius: 50%;
    background: var(--gradient-brand);
    background-size: 160% 160%;
    color: var(--color-on-gradient);
    box-shadow: 0 0 0 5px var(--color-canvas), 0 14px 28px -10px var(--color-glow);
    transition: transform 360ms var(--ease-spring), box-shadow var(--transition-base);
    animation: gradient-pan 8s ease-in-out infinite alternate;
  }
  .tabbar .tabbar__center .tabbar__orb .icon {
    padding: 0;
    background: none;
    box-shadow: none;
    color: inherit;
    animation: none;
  }
  .tabbar__center:active .tabbar__orb { transform: scale(0.9); }
  .tabbar__center[aria-current="page"] .tabbar__orb {
    transform: translateY(-2px) rotate(-8deg);
    box-shadow: 0 0 0 5px var(--color-canvas), 0 0 0 7px color-mix(in srgb, var(--aurora-2) 45%, transparent), 0 16px 30px -10px var(--color-glow);
  }
  .tabbar .tabbar__badge {
    position: absolute;
    top: -20px;
    left: calc(50% + 12px);
    margin: 0;
    box-shadow: 0 0 0 2.5px var(--color-canvas);
  }
  @media (max-width: 380px) {
    .tabbar .tabbar__center { flex-basis: 58px; }
    .tabbar__center .tabbar__orb { width: 52px; height: 52px; }
  }
  @media (max-width: 340px) {
    .tabbar .tabbar__center { flex-basis: 52px; }
    .tabbar__center .tabbar__orb { width: 48px; height: 48px; margin-top: -18px; }
  }
  @media (prefers-reduced-motion: reduce) { .tabbar__center .tabbar__orb { animation: none; } }

  :root[data-auth="in"] .app-main {
    padding-bottom: calc(var(--tabbar-height) + var(--space-8) + env(safe-area-inset-bottom));
  }
  :root[data-auth="in"] .app-footer { display: none; }
}

@media (max-width: 640px) {
  .topbar { padding-left: var(--space-4); padding-right: var(--space-4); }
  .app-main { padding: var(--space-6) var(--space-4) var(--space-8); }
  .app-footer { padding-left: var(--space-4); padding-right: var(--space-4); }
  h1 { font-size: 1.75rem; }
  /* Visitors on phones: the top bar keeps one action. */
  :root:not([data-auth="in"]) .topbar__link { display: none; }
  /* Room for longer Georgian / Russian labels: the switcher drops its
     chevron and the end group tightens. */
  .topbar__end { gap: 4px; }
  .topbar .lang-menu__chevron { display: none; }
  .topbar .lang-menu__button { padding: 0 7px; }
}

/* Smallest phones: the mark alone carries the brand. */
@media (max-width: 380px) {
  .topbar .brand__name { display: none; }
}