/* ========================================================================
   ReViz Design System — Components
   ======================================================================== */

/* ===== BUTTONS ===== */
.btn {
  --btn-bg: var(--accent);
  --btn-fg: var(--text-on-brand);
  --btn-border: transparent;
  --btn-hover-bg: var(--accent-hover);
  --btn-active-bg: var(--accent-active);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 20px;
  height: 44px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: background var(--t-base) var(--ease-out),
              color var(--t-base) var(--ease-out),
              border-color var(--t-base) var(--ease-out),
              transform var(--t-fast) var(--ease-spring),
              box-shadow var(--t-base) var(--ease-out);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}
.btn:hover { background: var(--btn-hover-bg); }
.btn:active { background: var(--btn-active-bg); transform: scale(0.98); }
.btn:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.btn[disabled], .btn:disabled {
  opacity: 0.4; cursor: not-allowed; pointer-events: none;
}

.btn--secondary {
  --btn-bg: transparent;
  --btn-fg: var(--text-strong);
  --btn-border: var(--border-base);
  --btn-hover-bg: var(--bg-muted);
  --btn-active-bg: var(--bg-sunken);
}
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--text-brand);
  --btn-border: transparent;
  --btn-hover-bg: var(--accent-ghost);
  --btn-active-bg: var(--accent-soft);
}
.btn--danger {
  --btn-bg: var(--danger-500);
  --btn-fg: var(--ink-0);
  --btn-hover-bg: var(--danger-600);
  --btn-active-bg: var(--danger-700);
}
.btn--quiet {
  --btn-bg: var(--bg-muted);
  --btn-fg: var(--text-strong);
  --btn-border: transparent;
  --btn-hover-bg: var(--ink-200);
  --btn-active-bg: var(--ink-300);
}
[data-theme="dark"] .btn--quiet {
  --btn-hover-bg: oklch(0.305 0.014 290);
  --btn-active-bg: oklch(0.355 0.014 290);
}

.btn--sm { height: 32px; padding: 0 14px; font-size: 13px; }
.btn--lg { height: 52px; padding: 0 28px; font-size: 16px; }

.btn--icon { width: 44px; padding: 0; }
.btn--sm.btn--icon { width: 32px; }
.btn--lg.btn--icon { width: 52px; }

.btn .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; opacity: 0.9;
  display: inline-block;
}

/* ===== INPUTS ===== */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field__label {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  display: flex; align-items: center; gap: 6px;
}
.field__label .req { color: var(--danger-500); }
.field__hint {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-faint);
}
.field__error {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--danger-600);
  display: flex; gap: 6px; align-items: center;
}

.input, .select, .textarea {
  font-family: var(--font-body-en), var(--font-body-cn);
  font-size: 15px;
  color: var(--text-strong);
  background: var(--bg-base);
  border: 1px solid var(--border-base);
  border-radius: var(--r-md);
  padding: 0 14px;
  height: 44px;
  width: 100%;
  transition: border-color var(--t-base) var(--ease-out),
              box-shadow var(--t-base) var(--ease-out),
              background var(--t-base) var(--ease-out);
  outline: none;
}
.textarea { padding: 12px 14px; height: auto; min-height: 96px; resize: vertical; line-height: 1.6; }
.input::placeholder, .textarea::placeholder { color: var(--text-faint); }
.input:hover, .select:hover, .textarea:hover { border-color: var(--border-strong); }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--focus-ring);
}
.input[disabled], .select[disabled], .textarea[disabled] {
  background: var(--bg-muted); color: var(--text-faint); cursor: not-allowed;
}
.input--error { border-color: var(--danger-500); }
.input--error:focus { box-shadow: 0 0 0 4px oklch(0.640 0.180 22 / 0.25); }

.select {
  appearance: none;
  -webkit-appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position:
    calc(100% - 18px) 19px,
    calc(100% - 13px) 19px;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 36px;
  color: var(--text-strong);
}

/* Checkbox + Radio */
.check, .radio {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body-en), var(--font-body-cn);
  font-size: 15px;
  color: var(--text-strong);
  cursor: pointer;
  user-select: none;
}
.check input, .radio input { position: absolute; opacity: 0; pointer-events: none; }
.check__box, .radio__box {
  position: relative;
  width: 20px; height: 20px;
  border: 1.5px solid var(--border-strong);
  background: var(--bg-base);
  transition: all var(--t-base) var(--ease-out);
  flex-shrink: 0;
}
.check__box { border-radius: 5px; }
.radio__box { border-radius: 50%; }
.check:hover .check__box, .radio:hover .radio__box { border-color: var(--accent); }
.check input:checked + .check__box {
  background: var(--accent); border-color: var(--accent);
}
.check input:checked + .check__box::after {
  content: ""; position: absolute;
  left: 5px; top: 1px; width: 6px; height: 11px;
  border: solid var(--ink-0); border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.radio input:checked + .radio__box { border-color: var(--accent); }
.radio input:checked + .radio__box::after {
  content: ""; position: absolute;
  inset: 3px; border-radius: 50%; background: var(--accent);
}
.check input:focus-visible + .check__box,
.radio input:focus-visible + .radio__box {
  box-shadow: 0 0 0 4px var(--focus-ring);
}

/* Switch */
.switch {
  position: relative;
  width: 40px; height: 22px;
  background: var(--ink-300);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: background var(--t-base) var(--ease-out);
  display: inline-block; flex-shrink: 0;
}
[data-theme="dark"] .switch { background: oklch(0.355 0.014 290); }
.switch::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--ink-0);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base) var(--ease-spring);
}
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch:has(input:checked) { background: var(--accent); }
.switch:has(input:checked)::after { transform: translateX(18px); }

/* ===== CARDS / SURFACES ===== */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 24px;
  transition: border-color var(--t-base) var(--ease-out),
              box-shadow var(--t-base) var(--ease-out),
              transform var(--t-base) var(--ease-out);
}
.card--interactive { cursor: pointer; }
.card--interactive:hover {
  border-color: var(--border-brand);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.card--elevated { box-shadow: var(--shadow-md); border-color: transparent; }
.card--tinted { background: var(--surface-tint); border-color: transparent; }
.card--brand {
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--text-strong);
}

/* ===== TAGS / BADGES / CHIPS ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--r-full);
  background: var(--bg-muted);
  color: var(--text-base);
  border: 1px solid transparent;
  line-height: 1;
  height: 24px;
}
.tag--outline { background: transparent; border-color: var(--border-base); color: var(--text-muted); }
.tag--brand { background: var(--accent-soft); color: var(--text-brand); }
.tag--success { background: var(--success-50); color: var(--success-700); }
.tag--warning { background: var(--warning-50); color: var(--warning-700); }
.tag--danger  { background: var(--danger-50);  color: var(--danger-700); }
.tag--info    { background: var(--info-50);    color: var(--info-700); }
[data-theme="dark"] .tag--success { background: oklch(0.275 0.07 155); color: oklch(0.85 0.07 155); }
[data-theme="dark"] .tag--warning { background: oklch(0.30 0.08 80); color: oklch(0.88 0.08 80); }
[data-theme="dark"] .tag--danger  { background: oklch(0.30 0.10 22); color: oklch(0.85 0.10 22); }
[data-theme="dark"] .tag--info    { background: oklch(0.275 0.08 240); color: oklch(0.85 0.08 240); }
[data-theme="dark"] .tag--brand   { background: oklch(0.30 0.07 295); color: oklch(0.88 0.06 295); }

.tag .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; flex-shrink: 0;
}

.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0 12px 0 8px;
  height: 32px;
  font-family: var(--font-sans);
  font-size: 13px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-base);
  border-radius: var(--r-full);
  color: var(--text-base);
  cursor: pointer;
  transition: all var(--t-base) var(--ease-out);
}
.chip:hover { border-color: var(--border-strong); }
.chip[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--text-brand);
}
.chip .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--border-strong);
}
.chip[aria-pressed="true"] .dot { background: var(--accent); }

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px; height: 20px;
  padding: 0 6px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  background: var(--danger-500);
  color: var(--ink-0);
  border-radius: var(--r-full);
}

/* ===== NAVIGATION ===== */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
}
.topnav__group { display: flex; align-items: center; gap: 24px; }
.topnav__brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif-en); font-style: italic; font-size: 22px; }
.topnav__brand .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.topnav__link {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  position: relative;
  padding: 6px 2px;
}
.topnav__link:hover { color: var(--text-strong); }
.topnav__link[aria-current="page"] { color: var(--text-strong); }
.topnav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 50%;
  width: 5px; height: 5px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateX(-50%);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  min-width: 220px;
}
.sidebar__section {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 10px 12px 6px;
}
.sidebar__item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-base);
  border-radius: var(--r-sm);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
  position: relative;
}
.sidebar__item:hover { background: var(--bg-muted); color: var(--text-strong); }
.sidebar__item[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--text-brand);
  font-weight: 500;
}
.sidebar__item[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -16px; top: 50%;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-50%);
}
.sidebar__item .count {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-faint);
}

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border-subtle);
}
.tab {
  position: relative;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--t-base) var(--ease-out);
}
.tab:hover { color: var(--text-strong); }
.tab[aria-selected="true"] { color: var(--text-strong); }
.tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  bottom: -1px; left: 16px; right: 16px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* ===== UTILITY ===== */
.swatch {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.swatch__chip {
  border-radius: var(--r-md);
  height: 88px;
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}
.swatch__chip[data-light="true"] { border-color: var(--border-base); }
.swatch__name {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-strong);
}
.swatch__value {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
}