/* ==========================================================================
   kotobạn — components
   Mobile-first. Every interactive target is at least 44px. Include
   tokens.css BEFORE this file.
   Class prefix: kb-
   ========================================================================== */

/* ---- buttons ------------------------------------------------------------ */

.kb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.75rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--kb-radius-sm);
  font-family: var(--kb-font-body);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.25;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.12s var(--kb-ease, ease),
              box-shadow 0.12s var(--kb-ease, ease),
              background-color 0.12s ease, color 0.12s ease;
  -webkit-tap-highlight-color: transparent;
}

.kb-btn:active { transform: translateY(1px) scale(0.99); }

.kb-btn:focus-visible {
  outline: 3px solid var(--kb-primary-soft);
  outline-offset: 2px;
}

/* Primary: the hanko stamp */
.kb-btn--primary {
  background: var(--kb-primary);
  color: var(--kb-primary-ink);
  box-shadow: var(--kb-shadow);
}
.kb-btn--primary:hover { filter: brightness(1.06); }

/* Secondary: paper on paper */
.kb-btn--secondary {
  background: var(--kb-surface);
  color: var(--kb-ink);
  border-color: var(--kb-line);
}
.kb-btn--secondary:hover { background: var(--kb-surface-2); }

/* Ghost: text only */
.kb-btn--ghost {
  background: transparent;
  color: var(--kb-primary);
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}
.kb-btn--ghost:hover { background: var(--kb-primary-soft); }

/* Danger */
.kb-btn--danger {
  background: var(--kb-danger);
  color: #fff;
}
.kb-btn--danger:hover { filter: brightness(1.08); }

.kb-btn--block { display: flex; width: 100%; }

.kb-btn:disabled,
.kb-btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

/* ---- cards -------------------------------------------------------------- */

.kb-card {
  background: var(--kb-surface);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius);
  box-shadow: var(--kb-shadow);
  padding: 1.25rem;
}

.kb-card__title {
  font-family: var(--kb-font-display);
  font-size: var(--kb-text-lg);
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.kb-card__meta {
  color: var(--kb-muted);
  font-size: var(--kb-text-sm);
  margin: 0;
}

/* ---- text inputs & select ----------------------------------------------- */

.kb-field { margin-bottom: 1rem; }

.kb-label {
  display: block;
  font-size: var(--kb-text-sm);
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--kb-ink-soft);
}

.kb-input,
.kb-select {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 0.7rem 0.9rem;
  box-sizing: border-box;
  background: var(--kb-surface);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-sm);
  font-family: var(--kb-font-body);
  font-size: 1rem; /* 16px+ prevents iOS zoom on focus */
  color: var(--kb-ink);
}

.kb-input::placeholder { color: var(--kb-muted); }

.kb-input:focus,
.kb-select:focus {
  outline: 3px solid var(--kb-primary-soft);
  outline-offset: 1px;
  border-color: var(--kb-primary);
}

.kb-select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 2.5rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1l6 6 6-6' fill='none' stroke='%234e4536' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

.kb-hint {
  font-size: var(--kb-text-xs);
  color: var(--kb-muted);
  margin: 0.35rem 0 0;
}

.kb-input[aria-invalid="true"] { border-color: var(--kb-danger); }
.kb-error {
  font-size: var(--kb-text-xs);
  color: var(--kb-danger);
  font-weight: 600;
  margin: 0.35rem 0 0;
}

/* ---- badges / pills ------------------------------------------------------ */

.kb-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0.15rem 0.7rem;
  border-radius: 999px;
  font-size: var(--kb-text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--kb-surface-2);
  color: var(--kb-ink-soft);
  border: 1px solid var(--kb-line);
  white-space: nowrap;
}

.kb-badge--primary { background: var(--kb-primary-soft); color: var(--kb-primary); border-color: transparent; }
.kb-badge--accent  { background: var(--kb-accent); color: var(--kb-accent-ink); border-color: transparent; }
.kb-badge--success { background: #e0efe5; color: var(--kb-success); border-color: transparent; }
.kb-badge--warn    { background: #f7e8d2; color: var(--kb-warn); border-color: transparent; }
.kb-badge--danger  { background: #f6dede; color: var(--kb-danger); border-color: transparent; }

/* ---- progress bars ------------------------------------------------------- */

.kb-progress {
  height: 10px;
  border-radius: 999px;
  background: var(--kb-surface-2);
  border: 1px solid var(--kb-line);
  overflow: hidden;
}

.kb-progress__fill {
  height: 100%;
  width: var(--kb-progress, 0%);
  border-radius: 999px;
  background: var(--kb-primary);
  transition: width 0.4s var(--kb-ease, ease);
}

.kb-progress--accent .kb-progress__fill { background: var(--kb-accent); }
.kb-progress--success .kb-progress__fill { background: var(--kb-success); }

/* Usage: <div class="kb-progress" role="progressbar" aria-valuenow="40"
            aria-valuemin="0" aria-valuemax="100"><div class="kb-progress__fill"
            style="--kb-progress: 40%"></div></div> */

/* ---- toggle -------------------------------------------------------------- */

.kb-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 44px;
  cursor: pointer;
  font-size: var(--kb-text-base);
  color: var(--kb-ink);
}

.kb-toggle input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.kb-toggle__track {
  flex: none;
  width: 52px;
  height: 30px;
  border-radius: 999px;
  background: var(--kb-surface-2);
  border: 1px solid var(--kb-line);
  position: relative;
  transition: background-color 0.18s var(--kb-ease, ease);
}

.kb-toggle__track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--kb-surface);
  box-shadow: 0 1px 3px rgba(32, 25, 20, 0.25);
  transition: transform 0.18s var(--kb-ease, ease);
}

.kb-toggle input:checked + .kb-toggle__track { background: var(--kb-primary); border-color: var(--kb-primary); }
.kb-toggle input:checked + .kb-toggle__track::after { transform: translateX(22px); }
.kb-toggle input:focus-visible + .kb-toggle__track { outline: 3px solid var(--kb-primary-soft); outline-offset: 2px; }

/* ---- alert banners -------------------------------------------------------- */

.kb-alert {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.9rem 1.1rem;
  border-radius: var(--kb-radius-sm);
  border: 1px solid var(--kb-line);
  background: var(--kb-surface);
  font-size: var(--kb-text-sm);
  color: var(--kb-ink-soft);
}

.kb-alert__icon { flex: none; font-size: 1.1rem; line-height: 1.4; }

.kb-alert--success { border-color: var(--kb-success); background: #eef5f0; color: #1f5136; }
.kb-alert--warn    { border-color: var(--kb-warn); background: #faf1e2; color: #6e3c05; }
.kb-alert--danger  { border-color: var(--kb-danger); background: #f9e9e9; color: #6e1414; }
.kb-alert--info    { border-color: var(--kb-primary); background: var(--kb-primary-soft); color: var(--kb-ink); }

.kb-alert strong { color: inherit; }

/* ---- larger screens: let the desktop breathe ------------------------------- */

@media (min-width: 720px) {
  .kb-card { padding: 1.75rem; }
  .kb-btn { min-height: 44px; }
}