/* App shell: reset, layout, nav, buttons, forms. Component-specific styles live in css/*.css.
   Every control carries the classic ornament language (design-guidelines §6.5): near-square
   corners, gilt inner hairlines, lozenge markers. Running reader text stays unornamented. */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}
img { max-width: 100%; display: block; }
button { font-family: inherit; }
a { color: var(--primary); text-decoration-color: var(--gold); text-underline-offset: .2em; }
::selection { background: var(--highlight); color: var(--ink); }
:focus-visible { outline: 2px solid var(--gold-ink); outline-offset: 2px; }

.app-shell {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.app-main {
  flex: 1 1 auto;
  min-height: 0;
  padding-bottom: env(safe-area-inset-bottom);
}

.app-main--with-nav {
  padding-bottom: calc(64px + env(safe-area-inset-bottom));
}

.container {
  max-width: 768px;
  margin: 0 auto;
  padding: var(--space-4) 20px;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0 0 var(--space-2); color: var(--ink); }
h1 { font-size: 32px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
p { margin: 0 0 var(--space-3); }

.text-muted { color: var(--ink-muted); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* Buttons: a gilt rule inset from the edge, like a tooled leather label */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2);
  min-height: 44px; min-width: 44px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-family: var(--font-ui); font-weight: 600; font-size: 16px; letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 150ms ease-out, background-color 150ms ease-out, opacity 150ms ease-out;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary {
  background: var(--primary); color: var(--on-primary); border-color: var(--primary);
  box-shadow: inset 0 0 0 2px var(--primary), inset 0 0 0 3px color-mix(in srgb, var(--gold) 75%, var(--primary)), var(--elevation-card);
}
.btn-primary::before, .btn-primary::after {
  content: ''; flex: none; width: 6px; height: 6px; background: color-mix(in srgb, var(--gold) 70%, var(--on-primary));
  -webkit-mask: var(--lozenge-mask) center / contain no-repeat; mask: var(--lozenge-mask) center / contain no-repeat;
}
.btn-primary:hover:not(:disabled) { background: color-mix(in srgb, var(--primary) 88%, var(--ink)); }
.btn-secondary {
  background: var(--surface); color: var(--ink); border-color: var(--gold-soft);
  box-shadow: inset 0 0 0 2px var(--surface), inset 0 0 0 3px var(--gold-faint);
}
.btn-secondary:hover:not(:disabled) { background: var(--surface-sunken); box-shadow: inset 0 0 0 2px var(--surface-sunken), inset 0 0 0 3px var(--gold-faint); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover:not(:disabled) { color: var(--primary); }
.btn-danger {
  background: transparent; color: var(--danger); border-color: var(--danger);
  box-shadow: inset 0 0 0 2px var(--surface), inset 0 0 0 3px color-mix(in srgb, var(--danger) 40%, transparent);
}
.btn-block { width: 100%; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 50%;
  background: transparent; border: none; color: var(--ink); cursor: pointer;
  transition: background-color 150ms ease-out, box-shadow 150ms ease-out;
}
.icon-btn:hover, .icon-btn:active { background: var(--surface-sunken); box-shadow: inset 0 0 0 1px var(--gold-soft); }

/* Forms: engraved small-capital labels, inputs ruled in gold */
.field { margin-bottom: var(--space-4); }
.field label, .field-label {
  display: block; margin-bottom: var(--space-1);
  font-family: var(--font-display); font-weight: 600; font-size: 15px; line-height: 1.35;
  text-transform: uppercase; letter-spacing: .1em; color: var(--gold-ink);
}
.field input, .field select, .text-input {
  width: 100%; min-height: 44px; padding: 10px 12px;
  border: 1px solid var(--gold-soft); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--ink); font-size: 16px;
  font-family: var(--font-ui);
  box-shadow: inset 0 1px 2px rgba(31, 27, 22, .05);
  transition: border-color 150ms ease-out, box-shadow 150ms ease-out;
}
.field input:focus, .field select:focus, .text-input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: inset 0 1px 2px rgba(31, 27, 22, .05), 0 0 0 3px var(--gold-faint);
}
.field-error { color: var(--danger); font-size: 14px; margin-top: var(--space-1); }
.field-password-toggle { display: flex; align-items: center; gap: var(--space-2); }
.field-password-toggle input { flex: 1; }

/* Card: hairline border with a second faint rule just inside */
.card {
  background: var(--surface); border: 1px solid var(--gold-soft);
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 3px var(--surface), inset 0 0 0 4px var(--gold-faint), var(--elevation-card);
  padding: var(--space-4);
}

/* Banner: lozenge marker leading the message, tinted rule round the edge */
.banner {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm); border: 1px solid;
  font-size: 14px;
}
.banner:not(:has(svg))::before {
  content: ''; flex: none; width: 7px; height: 7px; background: currentColor;
  -webkit-mask: var(--lozenge-mask) center / contain no-repeat; mask: var(--lozenge-mask) center / contain no-repeat;
}
.banner-error { background: color-mix(in srgb, var(--danger) 12%, var(--surface)); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 35%, transparent); }
.banner-info { background: var(--surface-sunken); color: var(--ink-muted); border-color: var(--gold-faint); }

/* Bottom nav: double gold rule on top, lozenge over the active tab */
.bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  display: flex; justify-content: space-around; align-items: stretch;
  height: 64px;
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--surface); border-top: 3px double var(--gold);
}
.bottom-nav a {
  position: relative;
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; text-decoration: none; color: var(--ink-muted); font-size: 12px; letter-spacing: .03em;
  min-height: 44px;
}
.bottom-nav a[aria-current='page'] { color: var(--primary); font-weight: 600; }
.bottom-nav a[aria-current='page']:not(.nav-capture)::before {
  content: ''; position: absolute; top: -6px; left: 50%; width: 9px; height: 9px; margin-left: -4.5px;
  background: var(--gold);
  -webkit-mask: var(--lozenge-mask) center / contain no-repeat; mask: var(--lozenge-mask) center / contain no-repeat;
}
.bottom-nav .nav-capture {
  margin-top: -14px;
}
.bottom-nav .nav-capture .nav-capture-circle {
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--primary); color: var(--on-primary);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--elevation-sheet);
}

/* Header */
.page-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-3); padding: var(--space-4) 20px 0;
  max-width: 768px; margin: 0 auto;
}
.page-header-back { display: flex; align-items: center; gap: var(--space-2); }

/* Labelled divider: ◆──── TRANG LỖI ────◆ */
.ornament {
  display: flex; align-items: center; gap: var(--space-3);
  color: var(--gold-ink); margin: var(--space-6) 0;
  font-family: var(--font-display); font-weight: 600; font-size: 15px; line-height: 1.35;
  text-transform: uppercase; letter-spacing: .12em;
}
.ornament::before, .ornament::after {
  content: ''; flex: 1; height: 9px; background: var(--gold);
  -webkit-mask: var(--lozenge-mask) var(--tip) center / 9px 9px no-repeat, linear-gradient(#000, #000) var(--line) center / calc(100% - 12px) 1px no-repeat;
  mask: var(--lozenge-mask) var(--tip) center / 9px 9px no-repeat, linear-gradient(#000, #000) var(--line) center / calc(100% - 12px) 1px no-repeat;
}
.ornament::before { --tip: left; --line: right; }
.ornament::after { --tip: right; --line: left; }

/* Skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--surface-sunken) 25%, var(--border) 50%, var(--surface-sunken) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
}
@media (prefers-reduced-motion: no-preference) {
  .skeleton { animation: skeleton-sheen 1.4s ease-in-out infinite; }
}
@keyframes skeleton-sheen { to { background-position: -200% 0; } }

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}