/* ============================================================
   KPOPVIEW V2.0 — Component CSS (.kv-*)
   BEM naming. Production-ready styles for Phase 0 components.
   ============================================================ */

/* ───────── BUTTON ───────── */
.kv-button {
  --_h: 44px;
  --_px: 18px;
  --_fs: 14px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: var(--_h);
  padding: 0 var(--_px);
  font: 600 var(--_fs)/1 var(--kv-font-en);
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--kv-radius-2);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: transform var(--kv-dur-instant) var(--kv-ease-out),
              background var(--kv-dur-fast) var(--kv-ease-out),
              border-color var(--kv-dur-fast) var(--kv-ease-out),
              box-shadow var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-button:active { transform: scale(0.97); }
.kv-button:focus-visible { outline: none; box-shadow: var(--kv-glow-focus); }

.kv-button--sm { --_h: 32px; --_px: 12px; --_fs: 12.5px; }
.kv-button--lg { --_h: 52px; --_px: 24px; --_fs: 15px; }

.kv-button--primary {
  background: var(--kv-primary);
  color: #fff;
}
.kv-button--primary:hover { background: var(--kv-primary-hover); box-shadow: 0 0 0 0 transparent, 0 8px 24px -8px rgba(255,45,146,0.55); }

.kv-button--secondary {
  background: var(--kv-surface-elevated);
  color: var(--kv-text-primary);
  border-color: var(--kv-border);
}
.kv-button--secondary:hover { border-color: var(--kv-border-hover); background: var(--kv-surface-overlay); }

.kv-button--ghost {
  background: transparent;
  color: var(--kv-text-secondary);
}
.kv-button--ghost:hover { color: var(--kv-text-primary); background: var(--kv-surface-elevated); }

.kv-button--danger {
  background: var(--kv-down);
  color: #fff;
}
.kv-button--danger:hover { filter: brightness(1.08); }

.kv-button[disabled], .kv-button--disabled {
  opacity: 0.4;
  pointer-events: none;
}

.kv-button__icon { width: 16px; height: 16px; display: inline-flex; }
.kv-button--lg .kv-button__icon { width: 18px; height: 18px; }

/* ───────── INPUT ───────── */
.kv-field { display: flex; flex-direction: column; gap: 6px; }
.kv-field__label {
  font: 600 12px/1 var(--kv-font-en);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--kv-text-secondary);
}
.kv-input {
  appearance: none;
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: var(--kv-surface);
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-2);
  color: var(--kv-text-primary);
  font: 400 14px/1 var(--kv-font-kr);
  transition: border-color var(--kv-dur-fast) var(--kv-ease-out), box-shadow var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-input::placeholder { color: var(--kv-text-muted); }
.kv-input:hover { border-color: var(--kv-border-hover); }
.kv-input:focus { outline: none; border-color: var(--kv-primary); box-shadow: var(--kv-glow-focus); }
.kv-input--error { border-color: var(--kv-down); }
.kv-input[disabled] { opacity: 0.5; }
.kv-field__help { font-size: 11px; color: var(--kv-text-muted); }
.kv-field__error { font-size: 11px; color: var(--kv-down); }

/* ───────── SEARCH BAR ───────── */
.kv-search {
  position: relative;
  display: flex;
  align-items: center;
}
.kv-search__icon {
  position: absolute;
  left: 14px;
  width: 16px; height: 16px;
  color: var(--kv-text-muted);
  pointer-events: none;
}
.kv-search__input {
  width: 100%;
  height: 40px;
  padding: 0 44px 0 40px;
  background: var(--kv-surface);
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-full);
  color: var(--kv-text-primary);
  font: 400 13.5px var(--kv-font-kr);
  transition: all var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-search__input::placeholder { color: var(--kv-text-muted); }
.kv-search__input:focus { outline: none; border-color: var(--kv-border-hover); background: var(--kv-surface-elevated); }
.kv-search__kbd {
  position: absolute;
  right: 8px;
  font: 600 10px var(--kv-font-mono);
  color: var(--kv-text-muted);
  border: 1px solid var(--kv-border);
  border-radius: 4px;
  padding: 3px 6px;
}

/* ───────── TABS ───────── */
.kv-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  border-bottom: 1px solid var(--kv-border);
  overflow-x: auto;
  scrollbar-width: none;
}
.kv-tabs::-webkit-scrollbar { display: none; }
.kv-tab {
  position: relative;
  padding: 14px 16px;
  font: 600 13px var(--kv-font-en);
  color: var(--kv-text-secondary);
  background: transparent;
  border: 0;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.02em;
  transition: color var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-tab:hover { color: var(--kv-text-primary); }
.kv-tab.is-active { color: var(--kv-text-primary); }
.kv-tab.is-active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: -1px;
  height: 2px;
  background: var(--kv-primary);
  border-radius: 2px 2px 0 0;
}
.kv-tab__count {
  font-family: var(--kv-font-mono);
  font-size: 10px;
  color: var(--kv-text-muted);
  margin-left: 6px;
  letter-spacing: 0.04em;
}

/* ───────── CHIP ───────── */
.kv-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  font: 600 12px var(--kv-font-en);
  color: var(--kv-text-secondary);
  background: var(--kv-surface);
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-full);
  cursor: pointer;
  user-select: none;
  transition: all var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-chip:hover { color: var(--kv-text-primary); border-color: var(--kv-border-hover); }
.kv-chip.is-active {
  color: #fff;
  background: var(--kv-primary);
  border-color: var(--kv-primary);
}
.kv-chip__close {
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px;
  border-radius: 50%;
  margin-right: -4px;
  opacity: 0.7;
}
.kv-chip__close:hover { opacity: 1; }

/* ───────── BADGE ───────── */
.kv-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 18px;
  padding: 0 6px;
  font: 700 9.5px/1 var(--kv-font-en);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 3px;
  white-space: nowrap;
}
.kv-badge--new { background: var(--kv-highlight); color: #1a1500; }
.kv-badge--hot { background: var(--kv-primary); color: #fff; }
.kv-badge--rising { background: var(--kv-up); color: #00210f; }
.kv-badge--exclusive { background: var(--kv-secondary); color: #fff; }
.kv-badge--ghost { background: var(--kv-surface-elevated); color: var(--kv-text-secondary); border: 1px solid var(--kv-border); }
.kv-badge--cert {
  background: linear-gradient(135deg, #FFD600, #FF8A00);
  color: #1a1500;
}

/* ───────── TOOLTIP ───────── */
.kv-tooltip {
  position: relative;
  display: inline-flex;
}
.kv-tooltip__bubble {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--kv-surface-overlay);
  border: 1px solid var(--kv-border-hover);
  color: var(--kv-text-primary);
  padding: 8px 12px;
  border-radius: var(--kv-radius-2);
  font: 500 12px var(--kv-font-kr);
  white-space: nowrap;
  box-shadow: var(--kv-elev-3);
  pointer-events: none;
}
.kv-tooltip__bubble::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--kv-surface-overlay);
}

/* ───────── MODAL ───────── */
.kv-modal {
  background: var(--kv-surface-elevated);
  border: 1px solid var(--kv-border-hover);
  border-radius: var(--kv-radius-3);
  box-shadow: var(--kv-elev-4);
  width: 100%;
  max-width: 440px;
  overflow: hidden;
}
.kv-modal__head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--kv-border);
}
.kv-modal__title { font: 600 16px var(--kv-font-kr); margin: 0; }
.kv-modal__body { padding: 20px; font-size: 14px; color: var(--kv-text-secondary); line-height: 1.6; }
.kv-modal__foot {
  display: flex; justify-content: flex-end; gap: 8px;
  padding: 14px 20px;
  border-top: 1px solid var(--kv-border);
  background: var(--kv-surface);
}

/* ───────── TOAST ───────── */
.kv-toast {
  display: flex; align-items: center; gap: 10px;
  background: var(--kv-surface-elevated);
  border: 1px solid var(--kv-border-hover);
  border-radius: var(--kv-radius-2);
  padding: 12px 16px;
  font: 500 13px var(--kv-font-kr);
  box-shadow: var(--kv-elev-3);
  min-width: 280px;
  border-left-width: 3px;
}
.kv-toast--success { border-left-color: var(--kv-up); }
.kv-toast--error { border-left-color: var(--kv-down); }
.kv-toast--info { border-left-color: var(--kv-info); }
.kv-toast--warn { border-left-color: var(--kv-highlight); }
.kv-toast__icon { width: 16px; height: 16px; flex-shrink: 0; }
.kv-toast--success .kv-toast__icon { color: var(--kv-up); }
.kv-toast--error .kv-toast__icon { color: var(--kv-down); }
.kv-toast--info .kv-toast__icon { color: var(--kv-info); }
.kv-toast--warn .kv-toast__icon { color: var(--kv-highlight); }

/* ───────── CARD (Album) ───────── */
.kv-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: transparent;
  cursor: pointer;
}
.kv-card__art {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--kv-radius-2);
  overflow: hidden;
  background: var(--kv-surface-elevated);
  transition: transform var(--kv-dur-base) var(--kv-ease-out);
}
.kv-card:hover .kv-card__art { transform: translateY(-2px); }
.kv-card__art::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,0.5));
  opacity: 0;
  transition: opacity var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-card:hover .kv-card__art::after { opacity: 1; }
.kv-card__badge {
  position: absolute;
  top: 8px; left: 8px;
  z-index: 2;
}
.kv-card__title {
  font: 600 14px/1.3 var(--kv-font-kr);
  color: var(--kv-text-primary);
  margin: 0;
  overflow: hidden; text-overflow: ellipsis; display: -webkit-box;
  -webkit-line-clamp: 1; -webkit-box-orient: vertical;
}
.kv-card__artist {
  font: 500 12px var(--kv-font-en);
  color: var(--kv-text-secondary);
  margin: 0;
}
.kv-card__meta {
  display: flex; align-items: center; gap: 8px;
  font: 500 11px var(--kv-font-mono);
  color: var(--kv-text-muted);
  letter-spacing: 0.04em;
}

/* ===========================================================
   ★ CHART ROW — the hero component
   =========================================================== */
.kv-chart {
  background: var(--kv-surface);
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-3);
  overflow: hidden;
}

/* —— Desktop table —— */
.kv-chart__head {
  display: grid;
  grid-template-columns: 56px 36px 64px minmax(0, 1fr) 56px 56px 64px 90px 56px;
  align-items: center;
  gap: 14px;
  padding: 14px 22px;
  font: 600 10px var(--kv-font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--kv-text-muted);
  border-bottom: 1px solid var(--kv-border);
  background: var(--kv-surface-elevated);
}

.kv-chart__row {
  display: grid;
  grid-template-columns: 56px 36px 64px minmax(0, 1fr) 56px 56px 64px 90px 56px;
  align-items: center;
  gap: 14px;
  padding: 12px 22px;
  border-bottom: 1px solid var(--kv-border);
  position: relative;
  transition: background var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-chart__row:last-child { border-bottom: 0; }
.kv-chart__row:hover { background: var(--kv-surface-elevated); }
.kv-chart__row:hover .kv-chart__sparkline { opacity: 1; }

.kv-chart__row--top { background: linear-gradient(90deg, color-mix(in oklab, var(--kv-highlight) 6%, transparent), transparent 40%); }

.kv-rank {
  font-family: var(--kv-font-display);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--kv-text-primary);
}
.kv-chart__row--top .kv-rank { color: var(--kv-highlight); }

.kv-mvmt {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font: 700 12px var(--kv-font-mono);
  font-variant-numeric: tabular-nums;
}
.kv-mvmt--up { color: var(--kv-up); }
.kv-mvmt--down { color: var(--kv-down); }
.kv-mvmt--flat { color: var(--kv-text-muted); }
.kv-mvmt--new {
  color: var(--kv-highlight);
  font-size: 10px;
  letter-spacing: 0.08em;
  animation: kv-newPulse 2s ease-in-out infinite;
}
.kv-mvmt__icon { width: 10px; height: 10px; }

@keyframes kv-newPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

.kv-art {
  position: relative;
  width: 48px; height: 48px;
  border-radius: var(--kv-radius-1);
  overflow: hidden;
  background: var(--kv-surface-elevated);
  flex-shrink: 0;
}
.kv-art__placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font: 700 18px var(--kv-font-display);
  letter-spacing: -0.02em;
  color: rgba(255,255,255,0.6);
}

.kv-meta { min-width: 0; }
.kv-meta__title {
  font: 600 14.5px/1.3 var(--kv-font-kr);
  color: var(--kv-text-primary);
  margin: 0 0 2px;
  display: flex; align-items: center; gap: 6px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.kv-meta__artist {
  font: 500 12.5px var(--kv-font-en);
  color: var(--kv-text-secondary);
  margin: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.kv-cell {
  font: 600 13px var(--kv-font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--kv-text-secondary);
  text-align: right;
}
.kv-cell--peak { color: var(--kv-text-primary); }

.kv-index {
  font-family: var(--kv-font-display);
  font-weight: 700;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--kv-text-primary);
  text-align: right;
  letter-spacing: -0.02em;
}
.kv-index__bar {
  position: relative;
  height: 3px;
  background: var(--kv-border);
  border-radius: 2px;
  margin-top: 4px;
  overflow: hidden;
}
.kv-index__fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: linear-gradient(90deg, var(--kv-secondary), var(--kv-primary));
  border-radius: 2px;
}

.kv-chart__sparkline {
  width: 56px; height: 22px;
  opacity: 0.6;
  transition: opacity var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-chart__sparkline path { stroke-width: 1.5; fill: none; }

/* —— Mobile chart row variant —— */
.kv-chart-mobile {
  background: var(--kv-bg);
}
.kv-chart-mobile__row {
  display: grid;
  grid-template-columns: 36px 56px minmax(0, 1fr) 64px;
  gap: 12px;
  align-items: center;
  padding: 10px 16px;
  border-bottom: 1px solid var(--kv-border);
}
.kv-chart-mobile__row .kv-rank { font-size: 22px; }
.kv-chart-mobile__row .kv-art { width: 56px; height: 56px; border-radius: 6px; }
.kv-chart-mobile__row .kv-meta__title { font-size: 14px; }
.kv-chart-mobile__row .kv-meta__artist { font-size: 12px; }
.kv-chart-mobile__right {
  display: flex; flex-direction: column; align-items: flex-end; gap: 4px;
}
.kv-chart-mobile__index {
  font: 700 14px var(--kv-font-display);
  color: var(--kv-text-primary);
  font-variant-numeric: tabular-nums;
}

/* ===========================================================
   ★ PODIUM (Top 3, desktop)
   =========================================================== */
.kv-podium {
  display: grid;
  grid-template-columns: 1fr 1.15fr 1fr;
  gap: 16px;
  align-items: end;
}
.kv-podium__cell {
  position: relative;
  background: var(--kv-surface);
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-3);
  padding: 18px;
  overflow: hidden;
  transition: transform var(--kv-dur-base) var(--kv-ease-out), border-color var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-podium__cell:hover { transform: translateY(-3px); border-color: var(--kv-border-hover); }

.kv-podium__cell--first {
  background:
    radial-gradient(120% 100% at 0% 0%, color-mix(in oklab, var(--kv-highlight) 14%, transparent), transparent 60%),
    var(--kv-surface);
  border-color: color-mix(in oklab, var(--kv-highlight) 30%, var(--kv-border));
}
.kv-podium__rank {
  font-family: var(--kv-font-display);
  font-weight: 700;
  font-size: 96px;
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: var(--kv-text-muted);
  font-variant-numeric: tabular-nums;
  margin: 0 0 16px;
  position: relative;
  z-index: 1;
}
.kv-podium__cell--first .kv-podium__rank { color: var(--kv-highlight); font-size: 128px; }
.kv-podium__art {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--kv-radius-2);
  overflow: hidden;
  background: var(--kv-surface-elevated);
  margin-bottom: 14px;
}
.kv-podium__title {
  font: 700 18px/1.25 var(--kv-font-kr);
  margin: 0 0 4px;
  display: flex; align-items: center; gap: 6px;
}
.kv-podium__artist {
  font: 500 13px var(--kv-font-en);
  color: var(--kv-text-secondary);
  margin: 0 0 12px;
}
.kv-podium__stats {
  display: flex; gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--kv-border);
  font: 500 11px var(--kv-font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--kv-text-muted);
}
.kv-podium__stats span strong {
  display: block;
  font-family: var(--kv-font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--kv-text-primary);
  margin-top: 2px;
  text-transform: none;
  letter-spacing: -0.02em;
}

/* ===========================================================
   ★ HEADER — Desktop & Mobile
   =========================================================== */
.kv-header {
  height: 72px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px;
  background: var(--kv-bg);
  border-bottom: 1px solid var(--kv-border);
  font-family: var(--kv-font-en);
}
.kv-header--compact { height: 56px; backdrop-filter: blur(14px); background: color-mix(in oklab, var(--kv-bg) 80%, transparent); }
.kv-header__l { display: flex; align-items: center; gap: 32px; }
.kv-header__nav { display: flex; align-items: center; gap: 4px; }
.kv-header__nav a {
  position: relative;
  font: 600 13px var(--kv-font-en);
  color: var(--kv-text-secondary);
  padding: 8px 14px;
  border-radius: var(--kv-radius-2);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color var(--kv-dur-fast) var(--kv-ease-out), background var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-header__nav a:hover { color: var(--kv-text-primary); background: var(--kv-surface); }
.kv-header__nav a.is-active { color: var(--kv-text-primary); }
.kv-header__nav a.is-active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: -2px;
  height: 2px; background: var(--kv-primary); border-radius: 2px;
}
.kv-header__nav a small {
  display: inline-block;
  font-family: var(--kv-font-kr);
  font-weight: 500;
  font-size: 10px;
  text-transform: none;
  letter-spacing: 0;
  color: var(--kv-text-muted);
  margin-left: 6px;
}
.kv-header__r { display: flex; align-items: center; gap: 10px; }
.kv-header__lang {
  display: inline-flex;
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-full);
  padding: 3px;
  font: 600 11px var(--kv-font-mono);
}
.kv-header__lang button {
  appearance: none; background: transparent; border: 0; cursor: pointer;
  color: var(--kv-text-muted); padding: 4px 9px; border-radius: 99px;
}
.kv-header__lang button.is-on { background: var(--kv-text-primary); color: var(--kv-text-inverse); }
.kv-header__avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--kv-secondary), var(--kv-primary));
  border: 1px solid var(--kv-border);
}

/* —— Mobile header —— */
.kv-header-mobile {
  height: 52px;
  padding: 0 16px;
  display: flex; align-items: center; justify-content: space-between;
  background: var(--kv-bg);
  border-bottom: 1px solid var(--kv-border);
}
.kv-header-mobile__brand { font: 700 17px var(--kv-font-display); letter-spacing: -0.01em; }
.kv-header-mobile__brand sup { font-size: 8px; color: var(--kv-text-muted); margin-left: 2px; }
.kv-header-mobile__r { display: flex; align-items: center; gap: 4px; }

/* —— Bottom Tab Bar —— */
.kv-bottomtab {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: 56px;
  background: var(--kv-bg);
  border-top: 1px solid var(--kv-border);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.kv-bottomtab__item {
  position: relative;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  font: 600 10px var(--kv-font-kr);
  color: var(--kv-text-muted);
  background: transparent; border: 0; cursor: pointer;
  transition: color var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-bottomtab__item svg { width: 22px; height: 22px; }
.kv-bottomtab__item.is-active { color: var(--kv-text-primary); }
.kv-bottomtab__item.is-active::before {
  content: ""; position: absolute; top: 0; left: 30%; right: 30%; height: 2px;
  background: var(--kv-primary); border-radius: 0 0 2px 2px;
}

/* ===========================================================
   ★ FOOTER
   =========================================================== */
.kv-footer {
  background: var(--kv-surface);
  padding: 64px 32px 32px;
  font-family: var(--kv-font-en);
}
.kv-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 48px;
}
.kv-footer__brand h3 {
  font-family: var(--kv-font-display);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
.kv-footer__brand p {
  font-size: 13px;
  color: var(--kv-text-secondary);
  line-height: 1.6;
  margin: 0 0 16px;
  font-family: var(--kv-font-kr);
  max-width: 320px;
}
.kv-footer__col h4 {
  font: 600 11px var(--kv-font-en);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--kv-text-muted);
  margin: 0 0 14px;
}
.kv-footer__col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.kv-footer__col a { font-size: 13px; color: var(--kv-text-secondary); transition: color var(--kv-dur-fast) var(--kv-ease-out); }
.kv-footer__col a:hover { color: var(--kv-text-primary); }
.kv-footer__bottom {
  max-width: 1200px;
  margin: 48px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--kv-border);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  font: 500 11px var(--kv-font-mono);
  color: var(--kv-text-muted);
  letter-spacing: 0.04em;
}
.kv-footer__social { display: flex; gap: 8px; }
.kv-footer__social a {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--kv-border);
  border-radius: 50%;
  color: var(--kv-text-secondary);
  transition: all var(--kv-dur-fast) var(--kv-ease-out);
}
.kv-footer__social a:hover { color: var(--kv-text-primary); border-color: var(--kv-border-hover); }
.kv-footer__social svg { width: 14px; height: 14px; }

/* ===========================================================
   ★ LOGO
   =========================================================== */
.kv-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--kv-font-display);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--kv-text-primary);
}
.kv-logo__symbol { display: inline-flex; }
.kv-logo__wordmark { font-size: 22px; line-height: 1; letter-spacing: -0.02em; }
.kv-logo__wordmark sup {
  font-family: var(--kv-font-mono);
  font-size: 8px;
  font-weight: 600;
  color: var(--kv-text-muted);
  letter-spacing: 0.06em;
  margin-left: 3px;
  vertical-align: super;
}

/* ============================================================
   Compatibility Aliases (기존 클래스명 호환 - 기존 차트/아티스트 페이지 등)
   ============================================================ */

/* Button size aliases */
.kv-button--small { --_h: 32px; --_px: 12px; --_fs: 12.5px; }
.kv-button--large { --_h: 52px; --_px: 24px; --_fs: 15px; }

/* Badge aliases */
.kv-badge--must-hear { background: var(--kv-highlight); color: #1a1500; }
.kv-badge--ai {
  background: var(--kv-surface-elevated);
  color: var(--kv-secondary);
  border: 1px solid var(--kv-secondary-muted);
}

/* Input label/helper/error (기존 kv-input-label 규약) */
.kv-input-label {
  display: block;
  font: 600 12px/1 var(--kv-font-en);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--kv-text-secondary);
  margin-bottom: var(--kv-space-2);
}
.kv-input-helper { font-size: 11px; color: var(--kv-text-muted); margin-top: 6px; }
.kv-input-error { font-size: 11px; color: var(--kv-down); margin-top: 6px; }

/* Tabs 기존 클래스 (__item 형태 - claude.ai/design은 .kv-tab 사용) */
.kv-tabs__item {
  position: relative;
  padding: 14px 16px;
  font: 600 13px var(--kv-font-en);
  color: var(--kv-text-secondary);
  background: transparent;
  border: 0;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.02em;
  transition: color var(--kv-dur-fast) var(--kv-ease-out);
  display: inline-block;
}
.kv-tabs__item:hover { color: var(--kv-text-primary); }
.kv-tabs__item--active { color: var(--kv-text-primary); }
.kv-tabs__item--active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: -1px;
  height: 2px;
  background: var(--kv-primary);
  border-radius: 2px 2px 0 0;
}

/* Chip 기존 classes */
.kv-chip--selected {
  color: #fff;
  background: var(--kv-primary);
  border-color: var(--kv-primary);
}

/* Card */
.kv-card {
  background: var(--kv-surface);
  border: 1px solid var(--kv-border);
  border-radius: var(--kv-radius-3);
  padding: var(--kv-space-4);
  transition: border-color var(--kv-dur-fast), box-shadow var(--kv-dur-fast), transform var(--kv-dur-fast);
}
.kv-card:hover {
  border-color: var(--kv-border-hover);
  box-shadow: var(--kv-elev-2);
}
.kv-card--elevated { background: var(--kv-surface-elevated); box-shadow: var(--kv-elev-1); }
.kv-card--compact  { padding: var(--kv-space-3) !important; }
.kv-card--bleed    { padding: 0 !important; overflow: hidden; }

/* PC hover lift */
@media (min-width: 1280px) {
  .kv-card:hover { transform: translateY(-2px); }
}

/* Tooltip content helper */
.kv-tooltip__content {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 12px;
  background: var(--kv-surface-overlay);
  color: var(--kv-text-primary);
  border: 1px solid var(--kv-border-hover);
  border-radius: var(--kv-radius-2);
  font: 500 12px var(--kv-font-kr);
  white-space: nowrap;
  box-shadow: var(--kv-elev-3);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--kv-dur-fast);
  z-index: 600;
}
.kv-tooltip:hover .kv-tooltip__content,
.kv-tooltip:focus-within .kv-tooltip__content { opacity: 1; }

/* Toast */
.kv-toast {
  position: fixed; top: var(--kv-space-4); left: 50%; transform: translateX(-50%);
  z-index: 500;
  padding: 12px 16px;
  background: var(--kv-surface-overlay);
  color: var(--kv-text-primary);
  border: 1px solid var(--kv-border-hover);
  border-radius: var(--kv-radius-2);
  box-shadow: var(--kv-elev-3);
  font-size: 13px;
  max-width: calc(100% - 32px);
}
.kv-toast--success { border-left: 3px solid var(--kv-up); }
.kv-toast--error   { border-left: 3px solid var(--kv-down); }
.kv-toast--info    { border-left: 3px solid var(--kv-secondary); }
.kv-toast--warning { border-left: 3px solid var(--kv-highlight); }
@media (min-width: 1024px) {
  .kv-toast {
    top: calc(var(--kv-header-h-desktop) + var(--kv-space-4));
    right: var(--kv-space-6); left: auto; transform: none;
    max-width: 400px;
  }
}

/* Display typography utilities */
.kv-display-xl { font-family: var(--kv-font-display); font-size: 72px; line-height: 1.1; font-weight: 800; }
.kv-display-l  { font-family: var(--kv-font-display); font-size: 56px; line-height: 1.1; font-weight: 800; }
.kv-display-m  { font-family: var(--kv-font-display); font-size: 44px; line-height: 1.1; font-weight: 700; }
.kv-h1 { font-size: 36px; line-height: 1.3; font-weight: 700; }
.kv-h2 { font-size: 28px; line-height: 1.3; font-weight: 700; }
.kv-h3 { font-size: 22px; line-height: 1.3; font-weight: 600; }
.kv-h4 { font-size: 18px; line-height: 1.3; font-weight: 600; }
.kv-h5 { font-size: 16px; line-height: 1.3; font-weight: 600; }
.kv-h6 { font-size: 14px; line-height: 1.3; font-weight: 600; }
.kv-body-lg { font-size: 18px; line-height: 1.6; }
.kv-body-md { font-size: 16px; line-height: 1.6; }
.kv-body-sm { font-size: 14px; line-height: 1.6; }
.kv-caption { font-size: 12px; line-height: 1.5; color: var(--kv-text-secondary); }
.kv-overline { font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--kv-text-secondary); }
.kv-num { font-family: var(--kv-font-en); font-variant-numeric: tabular-nums; }
.kv-rank-number { font-family: var(--kv-font-display); font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1; }
.kv-tm { font-size: 0.7em; vertical-align: super; opacity: 0.75; }
.kv-visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.kv-container { max-width: var(--kv-container-max); margin: 0 auto; padding: 0 var(--kv-space-4); }
@media (min-width: 768px) { .kv-container { padding: 0 var(--kv-space-6); } }
@media (min-width: 1280px) { .kv-container { padding: 0 var(--kv-space-8); } }