/* =====================================================================
   base.css - reset, typography, forms, utilities
   ===================================================================== */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }

p { margin: 0 0 var(--sp-3); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}
a:hover { color: var(--primary-hover); }

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }

ul, ol { margin: 0; padding: 0; list-style: none; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: var(--sp-5) 0;
}

code, pre { font-family: var(--font-mono); font-size: var(--fs-sm); }

/* ---------------------------------------------------------------- focus */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -60px; left: var(--sp-4);
  z-index: var(--z-toast);
  padding: 10px 18px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: calc(var(--sp-3) + var(--safe-top)); color: #fff; }

/* ---------------------------------------------------------------- icons */
.ico {
  flex: none;
  vertical-align: middle;
  stroke-width: 1.7;
}
.ico-thin { stroke-width: 1.4; }
.ico-bold { stroke-width: 2.1; }
.ico-fill { fill: currentColor; stroke: none; }

/* ------------------------------------------------------------- scrollbar */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border: 3px solid transparent;
  border-radius: var(--radius-pill);
  background-clip: content-box;
}
*::-webkit-scrollbar-thumb:hover { background: var(--text-muted); background-clip: content-box; }

.no-scrollbar { scrollbar-width: none; -ms-overflow-style: none; }
.no-scrollbar::-webkit-scrollbar { display: none; }

/* ---------------------------------------------------------------- forms */
input, select, textarea, button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

.field { margin-bottom: var(--sp-4); }

.label {
  display: block;
  margin-bottom: var(--sp-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-secondary);
}
.label .req { color: var(--danger); margin-left: 2px; }

.input,
.select,
.textarea {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--fs-md);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
  appearance: none;
  -webkit-appearance: none;
}

.textarea { min-height: 108px; resize: vertical; line-height: 1.6; }

.input::placeholder, .textarea::placeholder { color: var(--text-muted); }

.input:hover, .select:hover, .textarea:hover { border-color: var(--border-strong); }

.input:focus, .select:focus, .textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ring);
}

.input:disabled, .select:disabled, .textarea:disabled {
  background: var(--surface-2);
  color: var(--text-muted);
  cursor: not-allowed;
}

.input.is-invalid, .select.is-invalid, .textarea.is-invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-soft);
}

.select {
  padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238b93a7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5.5 9 6.5 6.5L18.5 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 13px center;
}
[data-theme="dark"] .select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236d7893' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5.5 9 6.5 6.5L18.5 9'/%3E%3C/svg%3E");
}

.hint { margin-top: 6px; font-size: var(--fs-xs); color: var(--text-muted); }
.error-text { margin-top: 6px; font-size: var(--fs-xs); color: var(--danger); font-weight: 500; }

.input-group { position: relative; }
.input-group .input { padding-right: 46px; }
.input-group-btn {
  position: absolute;
  top: 50%; right: 6px;
  transform: translateY(-50%);
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border: 0;
  border-radius: var(--radius-xs);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}
.input-group-btn:hover { background: var(--surface-2); color: var(--text-primary); }

.input-icon { position: relative; }
.input-icon .ico {
  position: absolute;
  top: 50%; left: 13px;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}
.input-icon .input { padding-left: 42px; }

/* checkbox + switch */
.check {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: var(--fs-base);
  min-height: 32px;
}
.check input[type="checkbox"],
.check input[type="radio"] {
  flex: none;
  width: 18px; height: 18px;
  margin: 0;
  accent-color: var(--primary);
  cursor: pointer;
}

.switch { display: inline-flex; align-items: center; gap: 12px; cursor: pointer; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch-track {
  position: relative;
  flex: none;
  width: 42px; height: 24px;
  background: var(--surface-3);
  border-radius: var(--radius-pill);
  transition: background var(--dur) var(--ease);
}
.switch-track::after {
  content: "";
  position: absolute;
  top: 3px; left: 3px;
  width: 18px; height: 18px;
  background: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-xs);
  transition: transform var(--dur) var(--ease);
}
.switch input:checked + .switch-track { background: var(--primary); }
.switch input:checked + .switch-track::after { transform: translateX(18px); }
.switch input:focus-visible + .switch-track { box-shadow: 0 0 0 3px var(--primary-ring); }

/* --------------------------------------------------------------- layout */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--sp-4);
}

.stack > * + * { margin-top: var(--sp-4); }
.row { display: flex; gap: var(--sp-3); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); }
.row-center { display: flex; align-items: center; gap: var(--sp-2); }
.wrap { flex-wrap: wrap; }
.grow { flex: 1 1 auto; min-width: 0; }

.grid { display: grid; gap: var(--sp-4); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }

/* ------------------------------------------------------------ utilities */
.text-sm { font-size: var(--fs-sm); }
.text-xs { font-size: var(--fs-xs); }
.text-lg { font-size: var(--fs-lg); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary-c { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.clamp-1, .clamp-2, .clamp-3 {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.clamp-1 { -webkit-line-clamp: 1; line-clamp: 1; }
.clamp-2 { -webkit-line-clamp: 2; line-clamp: 2; }
.clamp-3 { -webkit-line-clamp: 3; line-clamp: 3; }

.mt-0 { margin-top: 0; } .mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); } .mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); } .mt-6 { margin-top: var(--sp-6); }
.mb-0 { margin-bottom: 0; } .mb-2 { margin-bottom: var(--sp-2); }
.mb-3 { margin-bottom: var(--sp-3); } .mb-4 { margin-bottom: var(--sp-4); }
.mb-5 { margin-bottom: var(--sp-5); } .mb-6 { margin-bottom: var(--sp-6); }

.hidden { display: none !important; }
.relative { position: relative; }
.full-width { width: 100%; }

.divider { height: 1px; background: var(--border); margin: var(--sp-4) 0; }

/* ------------------------------------------------------------- a11y prefs */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .app-header, .app-sidebar, .bottom-nav, .toast-stack, .no-print { display: none !important; }
  body { background: #fff; }
}