/* ============================================================
   Bada International · Components
   Version : 3.0.0 — Apple DS alignment
   Purpose : Reusable UI primitives. Depends on tokens.css + base.css.
   Rationale:
     - .bd-button Apple spec (11/20, 8px radius, 15px/500, tracking -0.01em)
     - variants: primary (Apple Blue) / dark (Near Black) / ghost / filter / link-pill / inverse
     - hover: transform 없음 (Apple 패턴) — bg/color/border 전환만
     - .bd-card Apple 엘리베이션 shadow
     - 로고 lockup: Bada 시그니처 그대로 (브랜드 마크)
   ============================================================ */

/* === Logo Lockup === */
.bd-logo-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  line-height: 1;
}
.bd-logo-img { height: 40px; width: auto; display: block; }
.bd-logo-divider {
  font-size: 24px;
  color: var(--brand-bada-blue);
  opacity: 0.3;
  font-weight: 300;
  line-height: 1;
}
.bd-logo-select {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 28px;
  color: var(--brand-bada-blue);
  letter-spacing: var(--tracking-h3);
  line-height: 1;
}

/* Hero size variant */
.bd-logo-lockup--hero .bd-logo-img      { height: 72px; }
.bd-logo-lockup--hero .bd-logo-divider  { font-size: 40px; }
.bd-logo-lockup--hero .bd-logo-select   { font-size: 54px; letter-spacing: var(--tracking-tight); }

/* ============================================================
   BUTTON — Apple DS spec
   모든 variant 공유: 11px/20px padding, 8px radius, 15px/500, tracking -0.01em
   ============================================================ */
.bd-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.25rem;       /* 11px 20px — Apple spec */
  font-family: var(--font-sans);
  font-size: 0.9375rem;             /* 15px */
  font-weight: 500;
  letter-spacing: var(--tracking-btn);
  text-transform: none;
  text-decoration: none;
  line-height: 1.2;
  border-radius: var(--radius-button);  /* 8px */
  border: 1px solid var(--neutral-ink);
  color: var(--neutral-ink);
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background var(--dur-base) var(--ease-premium),
    color var(--dur-base) var(--ease-premium),
    border-color var(--dur-base) var(--ease-premium),
    box-shadow var(--dur-base) var(--ease-premium);
}
.bd-button:hover {
  background: var(--neutral-pressed);
  border-color: var(--neutral-ink-80);
  color: var(--neutral-ink);
}
.bd-button:active { background: var(--neutral-pressed); }

/* Primary — Apple Blue */
.bd-button--primary {
  background: var(--brand-primary);
  color: var(--neutral-off);
  border-color: var(--brand-primary);
}
.bd-button--primary:hover {
  background: var(--brand-primary-hover);
  border-color: var(--brand-primary-hover);
  color: var(--neutral-off);
}

/* Dark — Near-black fill (hero / dark-bg) */
.bd-button--dark {
  background: var(--neutral-ink);
  color: var(--neutral-off);
  border-color: var(--neutral-ink);
}
.bd-button--dark:hover {
  background: var(--neutral-ink-80);
  border-color: var(--neutral-ink-80);
  color: var(--neutral-off);
}

/* Ghost — outline, ink */
.bd-button--ghost {
  background: transparent;
  color: var(--neutral-ink);
  border-color: var(--neutral-ink);
}
.bd-button--ghost:hover {
  background: var(--neutral-pressed);
  color: var(--neutral-ink);
}

/* Filter/chip — 검색·필터 필드 */
.bd-button--filter {
  background: var(--neutral-filter);
  border-color: color-mix(in oklab, var(--neutral-ink) 15%, transparent);
  color: var(--neutral-ink);
  border-radius: var(--radius-search);  /* 11px */
}
.bd-button--filter:hover {
  background: var(--neutral-pressed);
  border-color: color-mix(in oklab, var(--neutral-ink) 30%, transparent);
}

/* Link-pill — borderless, Apple Blue text */
.bd-button--link-pill {
  background: transparent;
  border-color: transparent;
  color: var(--brand-primary);
  border-radius: var(--radius-pill);
  padding-inline: 0.75rem;
}
.bd-button--link-pill:hover {
  background: color-mix(in oklab, var(--brand-primary) 8%, transparent);
  border-color: transparent;
  color: var(--brand-primary-hover);
}

/* Inverse — 다크 섹션(hero dark bg) 위에서 사용 */
.bd-button--inverse {
  background: transparent;
  color: var(--neutral-off);
  border-color: var(--neutral-off);
}
.bd-button--inverse:hover {
  background: color-mix(in oklab, var(--neutral-off) 10%, transparent);
  color: var(--neutral-off);
  border-color: var(--neutral-off);
}

/* Inverse + primary fill (dark bg에서 primary 강조) */
.bd-button--inverse-primary {
  background: var(--neutral-off);
  color: var(--neutral-ink);
  border-color: var(--neutral-off);
}
.bd-button--inverse-primary:hover {
  background: color-mix(in oklab, var(--neutral-off) 90%, transparent);
  color: var(--neutral-ink);
  border-color: color-mix(in oklab, var(--neutral-off) 90%, transparent);
}

.bd-button[disabled], .bd-button.is-disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================================
   CARD — Apple feature card elevation
   ============================================================ */
.bd-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  background: var(--neutral-off);
  border: 1px solid color-mix(in oklab, var(--neutral-ink) 8%, transparent);
  border-radius: var(--radius-feature);    /* 12px */
  box-shadow: var(--shadow-md);
  transition:
    box-shadow var(--dur-base) var(--ease-premium),
    border-color var(--dur-base) var(--ease-premium);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}
.bd-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in oklab, var(--neutral-ink) 16%, transparent);
}
.bd-card__label {
  font-size: var(--text-label);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--brand-bada-blue);  /* 시그니처 마크 */
  margin-bottom: var(--space-1);
}
.bd-card__title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--text-display-m);
  color: var(--neutral-ink);
  letter-spacing: var(--tracking-h3);
  margin-bottom: var(--space-2);
  line-height: 1.14;
}
.bd-card__desc {
  font-size: var(--text-body-l);
  color: var(--neutral-ink-80);
  letter-spacing: var(--tracking-body);
  line-height: 1.47;
  margin-bottom: var(--space-3);
  flex-grow: 1;
}
.bd-card__cta {
  font-size: var(--text-body-m);
  font-weight: 500;
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: var(--tracking-btn);
}

/* ============================================================
   BADGE — pill 형 작은 라벨
   ============================================================ */
.bd-badge {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--neutral-gray-100);
  color: var(--neutral-ink-80);
}
.bd-badge--accent-orange {
  background: color-mix(in srgb, var(--brand-accent-orange) 15%, white);
  color: var(--brand-accent-orange);
}
.bd-badge--coming-soon {
  background: var(--neutral-gray-200);
  color: var(--neutral-ink-48);
}

/* ============================================================
   SECTION — vertical rhythm
   ============================================================ */
.bd-section {
  padding-block: clamp(5rem, 11vw, 9rem);
}
.bd-section--tight {
  padding-block: clamp(3rem, 7vw, 6rem);
}
.bd-section--stage  { background: var(--neutral-stage); }
.bd-section--off    { background: var(--neutral-off); }
.bd-section--inverse {
  background: var(--neutral-ink);
  color: var(--neutral-off);
}
.bd-section--inverse h1,
.bd-section--inverse h2,
.bd-section--inverse h3,
.bd-section--inverse h4,
.bd-section--inverse p { color: var(--neutral-off); }

/* ============================================================
   GRID — 3 column division
   ============================================================ */
.bd-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
@media (max-width: 900px) {
  .bd-grid-3 { grid-template-columns: 1fr; }
}

/* ============================================================
   SCROLL REVEAL — progressive enhancement
   No JS: content visible by default.
   With JS (html.js-reveal): opacity:0 → .is-revealed에서 opacity:1
   ============================================================ */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.7s var(--ease-premium),
    transform 0.7s var(--ease-premium);
  will-change: opacity, transform;
}
.js-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .js-reveal [data-reveal],
  .js-reveal [data-reveal].is-revealed {
    opacity: 1; transform: none; transition: none;
  }
}