/* ================================================================
   layout.css — App shell grid
   Layout: [ topbar (full width) ]
           [ sidebar | content    ]
   ================================================================ */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--topbar-height) auto 1fr;
  grid-template-areas:
    "topbar  topbar"
    "sidebar panel"
    "sidebar content";
  height: 100vh;
  height: 100dvh;          /* dynamic viewport height — correct on mobile browsers */
  overflow: hidden;        /* the shell itself never scrolls; content scrolls inside */
}

/* ── Panel-name strip (below the blue bar) ──────────────────── */
.panel-strip {
  grid-area: panel;
  background: linear-gradient(135deg, #162d4e 0%, #1e3a5f 100%);
  border-bottom: 1px solid rgba(201,163,91,0.4);
  padding: 7px var(--space-5);
  font-size: 15px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.4px;
  text-transform: none;
}

/* ── Topbar ─────────────────────────────────────────────────── */
.topbar {
  grid-area: topbar;
  background: linear-gradient(135deg, #162d4e 0%, var(--bg-topbar) 50%, #1a3358 100%);
  border-bottom: 2px solid var(--gold);
  color: var(--text-on-navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  position: relative;
  z-index: var(--z-topbar);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25), 0 1px 0 rgba(201,163,91,0.3);
}

.topbar-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: 0.5px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.topbar-actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.topbar-actions-gap {
  width: 64px;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .topbar-actions-gap {
    width: var(--space-3);
  }
}

/* ── Sidebar ────────────────────────────────────────────────── */
.sidebar {
  grid-area: sidebar;
  background: var(--sidebar-bg);
  border-right: none;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2) 0;
}

.nav-section {
  padding: 1px 0;
  border-bottom: 1px solid var(--sidebar-border);
}

.nav-section:last-child {
  border-bottom: none;
}

.nav-section-label {
  font-size: 9px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
  font-weight: var(--weight-bold);
  padding: 10px var(--space-4) 3px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 7px var(--space-4);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  color: var(--sidebar-text);
}

.nav-item:hover {
  background: var(--sidebar-bg-hover);
  color: rgba(255,255,255,0.9);
}

.nav-item.active {
  background: var(--sidebar-bg-active);
  border-left-color: var(--gold);
  color: var(--sidebar-text-active);
}

.nav-item.active .nav-item-label {
  color: #ffffff;
  font-weight: var(--weight-bold);
}

.nav-item-icon {
  font-size: 14px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-item.active .nav-item-icon {
  opacity: 1;
}

.nav-item-body {
  flex: 1;
  min-width: 0;
}

.nav-item-label {
  font-size: 13px;
  font-weight: var(--weight-semibold);
  color: inherit;
  line-height: 1.25;
}

.nav-item-desc {
  display: none;
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
  margin-top: 1px;
}

/* ── Logged-in user + logout ────────────────────────────────── */
.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-top: 1px solid var(--sidebar-border);
  background: rgba(0,0,0,0.2);
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-email {
  font-size: 12px;
  font-weight: var(--weight-semibold);
  color: rgba(255,255,255,0.85);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  font-size: 10px;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-logout {
  flex-shrink: 0;
  background: rgba(255,255,255,0.08) !important;
  border-color: rgba(255,255,255,0.15) !important;
  color: rgba(255,255,255,0.7) !important;
  font-size: 11px !important;
}

.sidebar-logout:hover {
  background: rgba(255,255,255,0.16) !important;
  color: #fff !important;
}

.sidebar-footer {
  padding: var(--space-2) var(--space-3);
  border-top: 1px solid var(--sidebar-border);
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  background: rgba(0,0,0,0.15);
}

.sidebar-footer-line {
  display: block;
  margin-bottom: 1px;
}

.sidebar-footer-label {
  display: inline-block;
  width: 60px;
  text-align: right;
  opacity: 0.6;
}

/* ── Topbar icon buttons (About / Help / LT Status) ─────────── */
.topbar-icon-btn {
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.20);
  color: rgba(255,255,255,0.92);
  font-size: 13px;
  font-weight: var(--weight-semibold);
  padding: 7px 13px;
  line-height: 1;
  white-space: nowrap;
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.topbar-icon-btn:hover {
  background: rgba(255, 255, 255, 0.20);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-1px);
}

/* ── Content area ───────────────────────────────────────────── */
.content {
  grid-area: content;
  overflow-y: auto;
  padding: var(--space-5);
  background: var(--bg-body);
}

.panel {
  display: none;
  max-width: var(--content-max);
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
  padding: var(--space-5);
  border: 1px solid var(--border);
}

.panel.active {
  display: block;
  animation: panel-fade-in 160ms ease-out;
}

@keyframes panel-fade-in {
  from { opacity: 0; transform: translateY(5px); }
  to   { opacity: 1; transform: translateY(0); }
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--border);
  position: relative;
}

.panel-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.panel-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--navy-text);
  letter-spacing: -0.3px;
}

/* ================================================================
   Responsive — PC, laptop, iPad, iPhone
   ================================================================ */

/* On tall desktop displays there's room to show the nav-item
   descriptions without overflowing the sidebar. */
@media (min-height: 860px) {
  .nav-item-desc { display: block; }
  .nav-item { align-items: flex-start; }
  .nav-item-icon { margin-top: 1px; }
}

/* ── Tablet / small laptop (iPad landscape and below) ───────── */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 210px;
  }
  .content { padding: var(--space-4); }
  /* Keep descriptions hidden here regardless of height — space is tight */
  .nav-item-desc { display: none !important; }
}

/* ── Narrow tablet (iPad portrait) ──────────────────────────── */
@media (max-width: 820px) {
  :root {
    --sidebar-width: 190px;
  }
  .topbar-title { font-size: var(--text-base); }
  /* Add-member buttons shrink to fit alongside Help/About */
  #topbar-add-sm, #topbar-add-pn {
    padding: 7px 10px !important;
    font-size: 12px;
  }
}

/* ── Phone (iPhone) ─────────────────────────────────────────────
   Collapse to a single column. The sidebar becomes a horizontal
   scrolling strip under the topbar. This keeps the app usable on a
   phone, though the intended primary devices are PC/laptop/iPad. */
@media (max-width: 640px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-height) auto auto 1fr;
    grid-template-areas:
      "topbar"
      "sidebar"
      "panel"
      "content";
  }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 40vh;
  }
  .sidebar-nav {
    /* show as a compact scrollable list */
    padding: 0;
  }
  .nav-item-desc { display: none !important; }
  .topbar {
    padding: 0 var(--space-3);
  }
  .topbar-title {
    font-size: 13px;
    line-height: 1.15;
    /* allow wrapping to two lines if the org name is long */
    white-space: normal;
    overflow: hidden;
  }
  #topbar-add-sm, #topbar-add-pn {
    padding: 6px 8px !important;
    font-size: 11px;
  }
  .topbar-icon-btn {
    padding: 6px 9px;
  }
  .content { padding: var(--space-3); }
  /* Stack the user info + logout vertically isn't needed; keep inline */
}

/* ── Help modal tabs (file-folder style) ─────────────────────── */
/* ================================================================
   HELP GUIDE — Premium V3
   ================================================================ */

/* The full-screen modal shell */
.hg-modal {
  position: relative;
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: 1fr;
  width: min(1440px, 96vw);
  height: min(880px, 94vh);
  background: var(--bg-panel);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0,0,0,.25), 0 0 0 1px rgba(0,0,0,.06);
  margin: auto;
}

/* Close button */
.hg-close {
  position: absolute;
  top: 16px;
  right: 18px;
  z-index: 10;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  font-size: 15px;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
}
.hg-close:hover { background: rgba(255,255,255,0.3); transform: scale(1.1); }

/* ── Left Nav ──────────────────────────────────────────────── */
.hg-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0;
  background: linear-gradient(180deg, #1a2744 0%, #14203a 100%);
  border-right: none;
  overflow-y: auto;
}
[data-theme="dark"] .hg-nav {
  background: linear-gradient(180deg, #0f172a 0%, #0c1322 100%);
}

.hg-nav-header {
  padding: 22px 20px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 6px;
}
.hg-nav-brand {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
}
.hg-nav-title {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-top: 2px;
}

.hg-tab {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 18px;
  margin: 0 8px;
  border: none;
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.55);
  font-family: inherit;
  text-align: left;
  width: calc(100% - 16px);
  transition: all .15s;
}
.hg-tab:hover {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.85);
}
.hg-tab-active {
  font-weight: 700;
  color: #fff !important;
  background: rgba(255,255,255,0.12) !important;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}
.hg-tab-icon-wrap {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  background: rgba(255,255,255,0.06);
  transition: background .15s;
}
.hg-tab-active .hg-tab-icon-wrap {
  background: rgba(255,255,255,0.15);
}
.hg-tab-label { flex: 1; line-height: 1.3; }

/* ── Right Content Area ────────────────────────────────────── */
.hg-content {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  background: var(--bg-panel);
}

/* Hero strip */
.hg-hero {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 28px;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}
.hg-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.07;
  background: radial-gradient(circle at 85% 50%, currentColor 0%, transparent 60%);
  pointer-events: none;
}
.hg-hero-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  flex-shrink: 0;
  background: rgba(255,255,255,0.85);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
[data-theme="dark"] .hg-hero-icon {
  background: rgba(255,255,255,0.1);
}
.hg-hero-title {
  font-size: 22px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.3px;
}
.hg-hero-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 3px;
  font-weight: 500;
}

/* ── Card Grid ─────────────────────────────────────────────── */
.hg-cards {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px 56px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  align-content: start;
}

/* ── Individual Card ───────────────────────────────────────── */
.hg-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0;
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s, transform .2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.hg-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
[data-theme="dark"] .hg-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}
.hg-card-wide {
  grid-column: 1 / -1;
}

/* Colored top strip on each card */
.hg-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px 10px;
  border-bottom: 1px solid var(--border);
  border-radius: 13px 13px 0 0;
  background: linear-gradient(135deg, color-mix(in srgb, var(--card-accent) 8%, transparent), transparent);
}
.hg-card-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
  background: color-mix(in srgb, var(--card-accent) 12%, transparent);
}
.hg-card-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}
.hg-card-body {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  flex: 1;
}
.hg-card-body strong { color: var(--text-primary); font-weight: 600; }
.hg-card-body code {
  font-family: var(--font-mono);
  font-size: 11.5px;
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: 5px;
  color: var(--text-primary);
}

/* ── Tip / Warn banners ────────────────────────────────────── */
.hg-tip, .hg-warn {
  margin-top: 8px;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.55;
  font-weight: 500;
}
.hg-tip {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  border: 1px solid #fde68a;
  color: #92400e;
}
[data-theme="dark"] .hg-tip {
  background: linear-gradient(135deg, #2d2206, #33280a);
  border-color: #78600c;
  color: #fbbf24;
}
.hg-warn {
  background: linear-gradient(135deg, #fef2f2, #fee2e2);
  border: 1px solid #fecaca;
  color: #991b1b;
}
[data-theme="dark"] .hg-warn {
  background: linear-gradient(135deg, #2d1515, #331a1a);
  border-color: #7f1d1d;
  color: #f87171;
}

/* ── Key-value rows ────────────────────────────────────────── */
.hg-rows { display: flex; flex-direction: column; gap: 4px; margin-top: 6px; }
.hg-row {
  display: flex;
  gap: 12px;
  padding: 7px 10px;
  background: var(--gray-50);
  border-radius: 8px;
  font-size: 12.5px;
  transition: background .1s;
}
.hg-row:hover { background: var(--bg-hover); }
.hg-row-key {
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  min-width: 130px;
}
.hg-row-val { color: var(--text-secondary); }

/* ── Role pills ────────────────────────────────────────────── */
.hg-pills { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 6px; }
.hg-pill {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.3px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

/* ── Scrollbar styling ─────────────────────────────────────── */
.hg-cards::-webkit-scrollbar { width: 6px; }
.hg-cards::-webkit-scrollbar-track { background: transparent; }
.hg-cards::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
.hg-cards::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 700px) {
  .hg-modal { grid-template-columns: 1fr; grid-template-rows: auto 1fr; border-radius: 14px; }
  .hg-nav { flex-direction: row; padding: 8px; overflow-x: auto; border-right: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .hg-nav-header { display: none; }
  .hg-tab { padding: 8px 10px; border-radius: 8px; margin: 0 2px; width: auto; white-space: nowrap; }
  .hg-tab-label { display: none; }
  .hg-tab-icon-wrap { width: 28px; height: 28px; }
  .hg-cards { grid-template-columns: 1fr; padding: 12px 14px 40px; }
}

@media (min-width: 701px) and (max-width: 1100px) {
  .hg-cards { grid-template-columns: 1fr 1fr; }
}

/* ================================================================
   RESPONSIVE SIDEBAR — Slide-out drawer (Phase 3)
   On screens ≤ 768px the sidebar collapses off-screen and slides
   in as an overlay drawer when the hamburger button is tapped.
   ================================================================ */

/* ── Hamburger button ────────────────────────────────────────── */
.hamburger-btn {
  display: none;              /* hidden on desktop */
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: var(--radius-md);
  cursor: pointer;
  flex-shrink: 0;
}
.hamburger-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
/* Animated X when open */
.hamburger-btn.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-btn.is-open span:nth-child(2) { opacity: 0; }
.hamburger-btn.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Overlay (semi-transparent backdrop) ─────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 25;                 /* above topbar(20), below modal(1000) */
  opacity: 0;
  transition: opacity .25s ease;
  -webkit-tap-highlight-color: transparent;
  pointer-events: none;        /* never intercept touches when invisible */
}
.sidebar-overlay.visible {
  opacity: 1;
  pointer-events: auto;        /* only intercept touches when actually shown */
}

/* ── Mobile breakpoint ≤ 768px ──────────────────────────────── */
@media (max-width: 768px) {
  /* Hamburger visible */
  .hamburger-btn { display: flex; }

  /* Collapse panel-strip — not needed on mobile */
  .panel-strip { display: none; }

  /* Full-width single-column layout */
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-height) 1fr;
    grid-template-areas:
      "topbar"
      "content";
  }

  /* Sidebar slides in from left as a fixed overlay */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(280px, 85vw);
    z-index: 30;               /* above overlay(25), below modal(1000) */
    transform: translateX(-100%);
    transition: transform .25s ease;
    box-shadow: none;
    border-right: 1px solid var(--sidebar-border);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;  /* smooth scroll on iOS */
  }

  /* Sidebar open state */
  .sidebar.is-open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,.25);
  }

  /* Overlay present in DOM on mobile but non-interactive until sidebar opens */
  .sidebar-overlay { display: block; pointer-events: none; }

  /* Content fills full width */
  .content {
    grid-area: content;
    padding: var(--space-3);
  }

  /* Topbar adjustments */
  .topbar-title {
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 45vw;
  }
  .topbar-icon-btn {
    padding: 6px 9px;
    font-size: 12px;
  }
  /* Hide the "Dark" / "About" text labels on very small screens, keep emojis */
  @media (max-width: 400px) {
    .topbar-icon-btn { padding: 6px 7px; font-size: 11px; }
  }

  /* Nav items slightly larger tap targets on mobile */
  .nav-item { padding: 9px var(--space-4); }
  .nav-item-label { font-size: 14px; }
  .nav-item-desc  { display: none !important; }
}

/* ── Dark mode sidebar overlay ───────────────────────────────── */
[data-theme="dark"] .sidebar-overlay { background: rgba(0,0,0,.65); }

/* ══════════════════════════════════════════════════════════════
   MOBILE — iPhone (≤ 480px) — ADDITIVE ONLY
   All rules below are inside max-width: 480px.
   Zero impact on desktop, laptop, or iPad.
   ══════════════════════════════════════════════════════════════ */
@media (max-width: 480px) {

  /* Prevent any element from pushing page wider than viewport */
  html, body {
    overflow-x: hidden;
    max-width: 100vw;
  }
  .app {
    overflow-x: hidden;
    max-width: 100vw;
  }

  /* Content area — tighter padding, full width, no overflow */
  .content {
    padding: var(--space-2) var(--space-3);
    overflow-x: hidden;
    max-width: 100%;
    box-sizing: border-box;
  }

  /* Topbar — prevent overflow, constrain title */
  .topbar {
    padding: 0 var(--space-2);
    overflow: hidden;
  }
  .topbar-title {
    font-size: 12px;
    max-width: 38vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  /* Topbar icon buttons — shrink to icon-only width on mobile.
     Buttons contain "🌙 Dark", "ℹ️ About", "❓ Help" as plain text.
     We set overflow:hidden and a fixed small width so only the emoji shows. */
  .topbar-icon-btn {
    padding: 5px 6px;
    font-size: 16px;
    min-width: 0;
    width: 34px;
    overflow: hidden;
    white-space: nowrap;
  }
}