/**
 * LETZBOX component styles — shell, header, tabs, buttons.
 * No idle animations (transitions on interaction only).
 * tokens.css is linked from index.html before this file.
 */

/* ── App shell ─────────────────────────────────────────────── */

.lb-app {
  min-height: 100dvh;
  height: 100%;
  height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-y: contain;
  padding-top: calc(var(--lb-header-h) + var(--lb-safe-top));
  padding-bottom: calc(var(--lb-tabs-h) + var(--lb-safe-bottom));
  background:
    linear-gradient(180deg, var(--lb-surface) 0%, var(--lb-canvas) 32%, var(--lb-canvas-deep) 100%);
}

/* Landing & onboarding hide the tab bar — drop the dead padding. */
body.no-tabs .lb-app {
  padding-bottom: calc(var(--lb-safe-bottom) + var(--lb-space-6));
}

.lb-main {
  width: min(100%, var(--lb-max-w));
  margin-inline: auto;
  padding: var(--lb-space-4);
}

/* ── Sticky header — dark chalkboard rail in every theme ───── */

.lb-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: calc(var(--lb-header-h) + var(--lb-safe-top));
  padding-top: var(--lb-safe-top);
  /* Brand left · actions right (search lives on Discover, not the global header). */
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--lb-space-3);
  padding-inline: var(--lb-space-4);
  background: var(--lb-header-bg);
  color: var(--lb-header-ink);
  border-bottom: 3px solid var(--lb-accent);
  box-shadow: var(--lb-shadow);
}

.lb-header__brand {
  display: flex;
  align-items: center;
  gap: var(--lb-space-2);
  min-width: 0;
  flex-shrink: 0;
  text-decoration: none;
}

.lb-header__logo {
  font-family: var(--lb-font-display);
  font-size: var(--lb-text-xl);
  letter-spacing: var(--lb-tracking-display);
  text-transform: uppercase;
  color: var(--lb-header-ink);
  line-height: 1;
}

.lb-header__logo span {
  color: var(--lb-accent);
}

/* USA tag — bold red, riding just after the wordmark at the SAME size as LETSBOX */
.lb-header__usa {
  font-style: normal;
  font-size: 1em;
  color: var(--lb-accent);
  letter-spacing: 0.08em;
  vertical-align: baseline;
  margin-left: 0.28em;
  font-weight: 700;
}

/* Header section tagline retired — the wordmark carries the header. */
.lb-header__tag {
  display: none;
}

.lb-header__actions {
  display: flex;
  align-items: center;
  gap: var(--lb-space-2);
  flex-shrink: 0;
}

/* Header action buttons sit on the dark rail — never chalk-on-chalk. */
.lb-header__actions .btn {
  color: var(--lb-header-ink);
  border-color: rgba(232, 223, 208, 0.4);
  background: transparent;
}

.lb-header__actions .btn:hover:not(:disabled) {
  color: var(--lb-header-gold);
  border-color: var(--lb-header-gold);
  background: rgba(255, 255, 255, 0.10); /* faint light wash on the dark rail */
}

/* ── Bottom tab bar ────────────────────────────────────────── */

.lb-tabs {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: calc(var(--lb-tabs-h) + var(--lb-safe-bottom));
  padding-bottom: var(--lb-safe-bottom);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  background: var(--lb-header-bg);
  backdrop-filter: blur(var(--lb-glass-blur));
  -webkit-backdrop-filter: blur(var(--lb-glass-blur));
  border-top: 1px solid var(--lb-glass-border);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.45);
  overflow: visible;
}

.lb-tab {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--lb-space-1);
  padding: var(--lb-space-2);
  border: 0;
  background: transparent;
  color: var(--lb-header-dim);
  font-family: var(--lb-font-stats);
  font-size: var(--lb-text-xs);
  letter-spacing: var(--lb-tracking-caps);
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--lb-duration) var(--lb-ease),
    background-color var(--lb-duration) var(--lb-ease);
}

.lb-tab:hover {
  color: var(--lb-header-ink);
  background: var(--lb-accent-soft);
}

.lb-tab.is-active {
  color: var(--lb-header-gold);
  background: var(--lb-accent-soft);
}

.lb-tab__icon {
  width: 1.25rem;
  height: 1.25rem;
  display: inline-flex;
}

/* ── Elevated centre Challenge tab — raised red coin, Tinder/IG style ── */
.lb-tab--center {
  justify-content: flex-end;
  color: var(--lb-header-ink);
}
.lb-tab--center .lb-tab__icon {
  width: 3.4rem;
  height: 3.4rem;
  padding: 0.8rem;
  margin-top: -1.7rem;
  border-radius: 50%;
  background: var(--lb-accent);
  color: var(--lb-ink-on-accent);
  border: 3px solid var(--lb-canvas);
  box-shadow:
    0 4px 14px rgba(255, 59, 48, 0.45),
    0 8px 22px rgba(0, 0, 0, 0.45);
  transition: transform var(--lb-duration) var(--lb-ease),
    background-color var(--lb-duration) var(--lb-ease);
}
.lb-tab--center:hover .lb-tab__icon {
  transform: translateY(-2px);
  background: var(--lb-accent-dark);
}
.lb-tab--center.is-active {
  background: transparent;
  color: var(--lb-header-gold);
}
.lb-tab--center.is-active .lb-tab__icon {
  background: var(--lb-accent-dark);
}
.lb-tab--center .lb-tab__badge {
  top: -1.35rem;
  right: calc(50% - 1.6rem);
}

.lb-tab__icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.lb-tab__badge {
  position: absolute;
  top: 0.35rem;
  right: calc(50% - 1.5rem);
  min-width: 1rem;
  height: 1rem;
  padding-inline: 0.2rem;
  border-radius: var(--lb-radius-pill);
  background: var(--lb-accent);
  color: var(--lb-ink-on-accent);
  font-size: var(--lb-text-xs);
  line-height: 1rem;
  text-align: center;
}

/* ── Buttons ───────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--lb-space-2);
  min-height: 2.75rem;
  padding: var(--lb-space-2) var(--lb-space-5);
  border-radius: var(--lb-radius-sm);
  border: 2px solid transparent;
  font-family: var(--lb-font-stats);
  font-size: var(--lb-text-sm);
  font-weight: 700;
  letter-spacing: var(--lb-tracking-caps);
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--lb-duration) var(--lb-ease),
    border-color var(--lb-duration) var(--lb-ease),
    color var(--lb-duration) var(--lb-ease),
    transform var(--lb-duration) var(--lb-ease);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--lb-accent);
  color: var(--lb-ink-on-accent);
  border-color: var(--lb-accent-dark);
  box-shadow: var(--lb-shadow-soft);
}

.btn-primary:hover:not(:disabled) {
  background: var(--lb-accent-dark);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-pass {
  background: transparent;
  color: var(--lb-pass);
  border-color: var(--lb-border-strong);
}

.btn-pass:hover:not(:disabled) {
  background: rgba(92, 79, 71, 0.08);
  border-color: var(--lb-pass);
}

/* Secondary — glass outline with light text (dark theme). */
.btn-secondary {
  background: var(--lb-surface-raised);
  backdrop-filter: blur(var(--lb-glass-blur));
  -webkit-backdrop-filter: blur(var(--lb-glass-blur));
  color: var(--lb-chalk);
  border-color: var(--lb-glass-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--lb-surface);
  border-color: var(--lb-border-strong);
  color: var(--lb-chalk-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--lb-chalk);
  border-color: var(--lb-border-strong);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--lb-accent-soft);
  border-color: var(--lb-accent);
  color: var(--lb-link);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  min-height: 3.25rem;
  font-size: var(--lb-text-base);
  padding-inline: var(--lb-space-6);
}

.btn-sm {
  min-height: 2.25rem;
  padding-inline: var(--lb-space-3);
  font-size: var(--lb-text-xs);
}

.btn-danger {
  background: var(--lb-danger);
  color: var(--lb-ink-on-accent);
  border-color: var(--lb-danger-deep);
}

.btn-danger:hover:not(:disabled) {
  background: var(--lb-danger-deep);
}

.btn-icon {
  min-width: 2.75rem;
  padding-inline: var(--lb-space-3);
}

/* ── Field error state (wired by app.js — 18+ gate etc.) ───── */

.lb-field--error .field__input {
  border-color: var(--lb-danger);
}

.lb-field--error.field--check > span,
.lb-field--error > .field__label {
  color: var(--lb-danger-ink);
}

.lb-field__error {
  display: block;
  font-size: max(var(--lb-text-xs), 11px);
  font-weight: 600;
  color: var(--lb-danger-ink);
}