/* ========================================================================
   Layout — Nav, sidebar, app shell, grids (Mobile-First)
   ======================================================================== */

/* ── Top navbar (public) ──────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 248, 241, 0.78);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background var(--dur-base) var(--ease-out);
}
.nav__inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink-500);
  font-variation-settings: "opsz" 144;
}
.nav__brand-mark {
  width: 36px; height: 36px;
  border-radius: 11px;
  background: linear-gradient(145deg, var(--ink-500) 0%, var(--ink-400) 100%);
  color: var(--cream-50);
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-style: italic;
  font-weight: 500;
  position: relative;
  overflow: visible;
  box-shadow: 0 2px 6px rgba(30, 27, 23, 0.12),
              inset 0 1px 0 rgba(255, 255, 255, 0.08);
  font-variation-settings: "opsz" 144, "SOFT" 100;
  flex-shrink: 0;
}
.nav__brand-mark::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 9px;
  background: radial-gradient(circle at 70% 30%, rgba(194, 83, 12, 0.45), transparent 55%);
  pointer-events: none;
}
.nav__brand-mark::after {
  content: "✦";
  position: absolute;
  top: -4px; right: -5px;
  font-size: 11px;
  color: var(--clay-500);
  font-style: normal;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  font-family: var(--font-sans);
  animation: brand-spark 3.5s ease-in-out infinite;
}
@keyframes brand-spark {
  0%, 100% { transform: scale(1) rotate(0deg); opacity: 1; }
  50% { transform: scale(0.85) rotate(180deg); opacity: 0.7; }
}
.nav__brand-mark i {
  position: relative;
  z-index: 1;
  font-style: italic;
}
.nav__brand-mark--light {
  background: linear-gradient(145deg, var(--cream-50), var(--cream-100));
  color: var(--ink-500);
}
.nav__brand-mark--clay {
  background: linear-gradient(145deg, var(--clay-500), var(--clay-600));
  color: var(--cream-50);
}
.nav__brand-mark--clay::before { background: radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.3), transparent 55%); }

.nav__menu {
  display: none; /* Mobile first: hidden */
  align-items: center;
  gap: 36px;
}
.nav__link {
  font-size: var(--text-sm);
  color: var(--ink-400);
  font-weight: 400;
  position: relative;
}
.nav__link:hover { color: var(--clay-500); }
.nav__link.is-active { color: var(--ink-500); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: -22px;
  height: 2px;
  background: var(--clay-500);
}

.nav__actions { display: flex; align-items: center; gap: 12px; }
.nav__actions .btn--ghost { display: none; /* Mobile first: hidden */ }

.nav__burger {
  display: inline-grid; /* Mobile first: visible */
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border-strong);
  cursor: pointer;
  position: relative;
}
.nav__burger::before, .nav__burger::after {
  content: ""; position: absolute;
  left: 10px; right: 10px;
  height: 1.5px; background: var(--ink-500);
  transition: transform var(--dur-base) var(--ease-out);
}
.nav__burger::before { top: 15px; }
.nav__burger::after { bottom: 15px; }
.nav__burger[aria-expanded="true"]::before { transform: rotate(45deg) translate(2px, 6px); }
.nav__burger[aria-expanded="true"]::after { transform: rotate(-45deg) translate(2px, -6px); }

/* Mobile menu drawer */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  z-index: 49;
  animation: nav-slide-in 220ms var(--ease-out);
}
.nav__mobile.is-open { display: flex; }
@keyframes nav-slide-in {
  from { transform: translateY(-10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@media (min-width: 881px) {
  .nav__menu { display: flex; }
  .nav__actions .btn--ghost { display: inline-flex; }
  .nav__burger { display: none; }
}

/* ── App shell (authenticated) ────────────────────────────────────────── */
.app {
  display: grid;
  grid-template-columns: 1fr; /* Mobile first */
  min-height: 100vh;
}
.sidebar {
  background: var(--cream-100);
  border-right: 1px solid var(--border);
  padding: 24px 18px;
  position: fixed; /* Mobile first */
  top: 0; left: 0;
  width: 86%;
  max-width: 320px;
  height: 100vh;
  z-index: 100;
  transform: translateX(-100%);
  transition: transform var(--dur-base) var(--ease-out);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.sidebar.is-open { transform: translateX(0); }

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
  padding: 0 6px;
  font-family: var(--font-display);
  font-size: 1.45rem;
  color: var(--ink-500);
  font-variation-settings: "opsz" 144;
}

.sidebar__section {
  margin-bottom: 22px;
}
.sidebar__label {
  font-size: var(--text-2xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-subtle);
  padding: 0 12px 8px;
}
.sidebar__nav { display: flex; flex-direction: column; gap: 2px; }
.sidebar__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--ink-400);
  transition: all var(--dur-fast) var(--ease-out);
  cursor: pointer;
}
.sidebar__item:hover { background: var(--cream-200); color: var(--ink-500); }
.sidebar__item.is-active {
  background: var(--ink-500);
  color: var(--cream-50);
}
.sidebar__item .icon, .sidebar__item svg { width: 18px; height: 18px; }
.sidebar__item .count {
  margin-left: auto;
  background: var(--cream-200);
  color: var(--ink-400);
  font-size: var(--text-2xs);
  padding: 2px 8px;
  border-radius: 999px;
}
.sidebar__item.is-active .count { background: rgba(255,255,255,0.18); color: var(--cream-50); }

.sidebar__event {
  margin-top: auto;
  padding: 16px;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}
.sidebar__event h6 {
  font-size: var(--text-sm);
  margin-bottom: 4px;
  color: var(--ink-500);
}
.sidebar__event .meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* Main content area */
.app__main {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  width: 100%; /* Mobile first */
  min-width: 0;
}

/* Topbar inside app */
.topbar {
  height: 64px; /* Mobile first */
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px; /* Mobile first */
  gap: 12px; /* Mobile first */
  background: rgba(251, 248, 241, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 30;
}
.topbar [data-sidebar-toggle] { display: grid !important; place-items: center; }
.topbar__title {
  font-family: var(--font-display);
  font-size: 1.2rem; /* Mobile first */
  color: var(--ink-500);
}
.topbar__search {
  display: none; /* Mobile first */
  flex: 1;
  max-width: 420px;
  position: relative;
}
.topbar__search input {
  width: 100%;
  padding: 10px 14px 10px 38px;
  background: var(--cream-100);
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: var(--text-sm);
}
.topbar__search input:focus { background: var(--surface); border-color: var(--border-strong); }
.topbar__search .icon-left {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  color: var(--text-muted);
}
.topbar__actions { display: flex; align-items: center; gap: 8px; }
.topbar__actions .btn--icon { width: 36px; height: 36px; }
.topbar__actions .btn--icon[data-tip="Invite collaborators"] { display: none; } /* Mobile first: < 480 */

@media (min-width: 481px) {
  .topbar__actions .btn--icon[data-tip="Invite collaborators"] { display: inline-flex; }
}

@media (min-width: 981px) {
  .app { grid-template-columns: var(--sidebar-w) 1fr; }
  .sidebar {
    position: sticky;
    width: auto;
    max-width: none;
    transform: none;
    box-shadow: none;
  }
  .app__main { width: auto; }
  .topbar { padding: 0 32px; gap: 24px; height: 72px; }
  .topbar__search { display: block; }
  .topbar__title { font-size: 1.5rem; }
  .topbar [data-sidebar-toggle] { display: none !important; }
  .topbar__actions .btn--icon { width: 40px; height: 40px; }
}

/* App content padding */
.app__content {
  padding: 16px; /* Mobile first */
  flex: 1;
  min-width: 0;
}
@media (min-width: 981px) {
  .app__content { padding: 32px; }
}

/* Sidebar overlay on mobile */
.sidebar-overlay {
  position: fixed; inset: 0;
  background: rgba(17,16,13,0.4);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}
.sidebar-overlay.is-open { opacity: 1; pointer-events: auto; }

/* ── Grids ───────────────────────────────────────────────────────────── */
.grid { display: grid; gap: var(--space-6); }
/* Mobile-first grids: 1 column by default */
.grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-vendors { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

@media (min-width: 601px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 901px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: 4px; } .gap-2 { gap: 8px; } .gap-3 { gap: 12px; }
.gap-4 { gap: 16px; } .gap-5 { gap: 20px; } .gap-6 { gap: 24px; }
.gap-7 { gap: 32px; } .gap-8 { gap: 40px; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; min-width: 0; }
.w-full { width: 100%; }

.mt-1 { margin-top: 4px; } .mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; } .mt-4 { margin-top: 16px; }
.mt-5 { margin-top: 20px; } .mt-6 { margin-top: 24px; }
.mt-7 { margin-top: 32px; } .mt-8 { margin-top: 40px; }
.mb-1 { margin-bottom: 4px; } .mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; } .mb-4 { margin-bottom: 16px; }
.mb-5 { margin-bottom: 20px; } .mb-6 { margin-bottom: 24px; }
.mb-7 { margin-bottom: 32px; } .mb-8 { margin-bottom: 40px; }

/* Two-column page layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr; /* Mobile first */
  gap: 32px;
  align-items: start;
}
@media (min-width: 1101px) {
  .two-col { grid-template-columns: 1fr 360px; }
}

/* Page header */
.page-head {
  margin-bottom: var(--space-7);
}
.page-head__crumb {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.page-head h1 { margin-bottom: 8px; }
.page-head p { color: var(--text-muted); max-width: 60ch; }

/* Footer (public) */
.footer {
  background: var(--ink-500);
  color: var(--cream-100);
  padding: 60px 0 32px; /* Mobile first */
  margin-top: 80px;
}
.footer__top {
  display: grid;
  grid-template-columns: 1fr; /* Mobile first */
  gap: 32px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(247, 242, 232, 0.1);
}
.footer__brand { font-family: var(--font-display); font-size: 1.5rem; color: var(--cream-50); }
.footer__brand-text { margin-top: 8px; font-size: var(--text-sm); color: rgba(247, 242, 232, 0.6); max-width: 36ch; }
.footer__col h6 {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cream-300);
  margin-bottom: 16px;
}
.footer__col ul { display: flex; flex-direction: column; gap: 10px; }
.footer__col a { font-size: var(--text-sm); color: rgba(247, 242, 232, 0.7); }
.footer__col a:hover { color: var(--clay-300); }

.footer__bottom {
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: var(--text-xs);
  color: rgba(247, 242, 232, 0.5);
}

@media (min-width: 481px) {
  .footer__top { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 801px) {
  .footer { padding-top: 80px; margin-top: 120px; }
  .footer__top { grid-template-columns: 1.5fr repeat(3, 1fr); gap: 48px; }
}