/* ============================================================
   나비 앨범 (Nabi Album) — Design System
   브랜드 · 팔레트 · 타이포 · 모션
   ============================================================ */

:root {
  /* ─── Brand Palette ────────────────────────────────────── */
  --nabi-pink:   #FF6B9D;   /* primary CTA, 주요 포커스 */
  --nabi-coral:  #FFA37D;   /* 그라디언트 페어 */
  --nabi-sky:    #A8D8EA;   /* accent, 진행바 글로우 */
  --nabi-cream:  #FDF9F3;   /* 페이지 배경 (따뜻한 오프화이트) */
  --nabi-peach:  #FFE4E1;   /* 서피스, 키커 배경 */
  --nabi-ink:    #2A2422;   /* 본문 텍스트 */
  --nabi-sub:    #6A605C;   /* 서브 텍스트 */
  --nabi-line:   #F0E6DB;   /* 보더 */

  /* ─── Legacy Aliases (기존 코드 호환) ───────────────────── */
  --color-primary:   var(--nabi-pink);
  --color-secondary: var(--nabi-coral);
  --color-accent:    var(--nabi-sky);
  --color-dark:      var(--nabi-ink);
  --color-light:     var(--nabi-cream);
  --color-card:      #FFFFFF;
  --color-bg:        var(--nabi-cream);
  --color-surface:   #FFFFFF;
  --color-text:      var(--nabi-ink);
  --color-text-sub:  var(--nabi-sub);
  --color-border:    var(--nabi-peach);
  --color-overlay:   rgba(255,255,255,0.92);
  --clr-primary:     var(--nabi-pink);
  --clr-primary-dk:  #E85A8A;
  --clr-accent-dk:   #8CC0D3;
  --clr-muted:       var(--nabi-sub);
  --clr-border:      var(--nabi-peach);
  --clr-drag-over:   color-mix(in srgb, var(--nabi-pink) 8%, transparent);
  --clr-surface:     #FFFFFF;

  /* ─── Shadows (color-mix 기반) ──────────────────────────── */
  --shadow-soft:   0 4px 20px rgba(0,0,0,0.06);
  --shadow-hover:  0 8px 30px rgba(0,0,0,0.12);
  --shadow-btn:    0 10px 24px color-mix(in srgb, var(--nabi-pink) 35%, transparent);
  --shadow-card:   var(--shadow-soft);
  --shadow-pink:   var(--shadow-btn);

  /* ─── Border Radius ─────────────────────────────────────── */
  --radius-sm:   8px;
  --radius:      16px;
  --radius-lg:   24px;
  --radius-btn:  9999px;
  --radius-box:  var(--radius);

  /* ─── Typography ────────────────────────────────────────── */
  --font-display: "Cafe24Ssurround", "Pretendard", "Apple SD Gothic Neo", system-ui, sans-serif;
  --font-body:    "Pretendard", "Apple SD Gothic Neo", system-ui, -apple-system, "Noto Sans KR", sans-serif;
  --font-heading: var(--font-body); /* legacy alias */

  /* ─── Motion ────────────────────────────────────────────── */
  --dur-fast:     150ms;
  --dur:          250ms;
  --dur-slow:     400ms;
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition:       var(--dur) var(--ease);
  --transition-slow:  var(--dur-slow) var(--ease);

  /* ─── Layout ────────────────────────────────────────────── */
  --content-max: 640px;
}

/* ─── Dark Mode ──────────────────────────────────────────── */
[data-theme="dark"] {
  --nabi-cream:  #1A1614;
  --nabi-peach:  #2A2420;
  --nabi-ink:    #F5EFE8;
  --nabi-sub:    #A89F97;
  --nabi-line:   #3A3530;
  /* 채도 약간 낮춰 야간 시인성 */
  --nabi-pink:   #E85A8A;
  --nabi-coral:  #E89470;
  --nabi-sky:    #97C8D9;

  --color-card:    #2A2420;
  --color-surface: #2A2420;
  --color-overlay: rgba(42,36,32,0.95);
  --clr-surface:   #2A2420;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --nabi-cream:  #1A1614;
    --nabi-peach:  #2A2420;
    --nabi-ink:    #F5EFE8;
    --nabi-sub:    #A89F97;
    --nabi-line:   #3A3530;
    --nabi-pink:   #E85A8A;
    --nabi-coral:  #E89470;
    --nabi-sky:    #97C8D9;
    --color-card:    #2A2420;
    --color-surface: #2A2420;
    --color-overlay: rgba(42,36,32,0.95);
    --clr-surface:   #2A2420;
  }
}

/* ─── Reduced motion ─────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .nabi-blob { opacity: 0.2 !important; }
}

/* ─── Accessibility ──────────────────────────────────────── */
/* 스크린리더 전용 텍스트 — 시각적으로는 숨김, a11y tree 에는 노출 */
.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;
}

/* ─── Icon System ────────────────────────────────────────── */
/* Lucide-style stroke icons + 커스텀 브랜드 마크 공용 */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  color: currentColor;
  vertical-align: middle;
  flex-shrink: 0;
}
.icon .icon-svg {
  width: 100%;
  height: 100%;
  display: block;
}
.icon-xs { width: 0.85em; height: 0.85em; }
.icon-sm { width: 1em;    height: 1em;    }
.icon-md { width: 1.5em;  height: 1.5em;  }
.icon-lg { width: 2em;    height: 2em;    }
.icon-xl { width: 3em;    height: 3em;    }
.icon-2xl{ width: 4.5em;  height: 4.5em;  }

/* 브랜드 로고 마크 (발자국 + 워드마크) */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  text-decoration: none;
  color: var(--nabi-ink);
}
.brand-logo .brand-mark {
  height: 1.8em;
  width: auto;
  flex: 0 0 auto;
  color: var(--nabi-pink);
  filter: drop-shadow(0 4px 8px color-mix(in srgb, var(--nabi-pink) 28%, transparent));
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.brand-logo .brand-mark .icon-svg { height: 100%; width: auto; display: block; }
.brand-logo .brand-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--nabi-ink);
  white-space: nowrap;
  margin: 0;
  line-height: 1.1;
}


/* ══════════════════════════════════════════════════════════
   Common Components
   ══════════════════════════════════════════════════════════ */

/* ─── Primary Button (CTA) ───────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  background: linear-gradient(135deg, var(--nabi-pink) 0%, var(--nabi-coral) 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius-btn);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px color-mix(in srgb, var(--nabi-pink) 50%, transparent);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-btn);
}

.btn-primary:disabled,
.btn-primary.loading {
  opacity: 0.65;
  cursor: not-allowed;
  pointer-events: none;
}

/* ─── Secondary Button ───────────────────────────────────── */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  background: #fff;
  color: var(--nabi-pink);
  border: 2px solid var(--nabi-pink);
  border-radius: var(--radius-btn);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-secondary:hover {
  background: var(--nabi-pink);
  color: #fff;
  transform: translateY(-2px);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* ─── Card ───────────────────────────────────────────────── */
.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 1.5rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

/* ─── Badge ──────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-btn);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: linear-gradient(135deg, var(--nabi-pink), var(--nabi-coral));
  color: #fff;
}

.badge-peach {
  background: var(--nabi-peach);
  color: var(--nabi-pink);
}

.badge-outline {
  background: transparent;
  border: 1.5px solid var(--nabi-pink);
  color: var(--nabi-pink);
}

/* ─── Background Blobs ───────────────────────────────────── */
.nabi-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}

.nabi-blob-peach {
  background: radial-gradient(circle, var(--nabi-peach), transparent 70%);
}

.nabi-blob-sky {
  background: radial-gradient(circle, var(--nabi-sky), transparent 70%);
}

@media (max-width: 640px) {
  .nabi-blob {
    filter: blur(40px);
    opacity: 0.3;
  }
}

/* ─── Section Title ──────────────────────────────────────── */
.ds-section-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 800;
  color: var(--nabi-ink);
  text-align: center;
  margin-bottom: 1.25rem;
}

/* ─── Gradient Text ──────────────────────────────────────── */
.ds-gradient-text {
  background: linear-gradient(135deg, var(--nabi-pink), var(--nabi-coral));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Spinner ────────────────────────────────────────────── */
.ds-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: ds-spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes ds-spin {
  to { transform: rotate(360deg); }
}

/* ─── Shimmer ────────────────────────────────────────────── */
@keyframes ds-shimmer {
  0%   { background-position: -200% center; }
  100% { background-position:  200% center; }
}

.ds-shimmer {
  background: linear-gradient(90deg, var(--nabi-line) 25%, var(--nabi-peach) 50%, var(--nabi-line) 75%);
  background-size: 200% auto;
  animation: ds-shimmer 1.5s linear infinite;
}

/* ─── Glow Card ──────────────────────────────────────────── */
.card-glow {
  position: relative;
}

.card-glow::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius) + 2px);
  background: linear-gradient(135deg, var(--nabi-pink), var(--nabi-coral), var(--nabi-sky));
  z-index: -1;
  opacity: 0.7;
  transition: opacity var(--transition);
}

.card-glow:hover::before {
  opacity: 1;
}

/* ─── Progress Bar ───────────────────────────────────────── */
.ds-progress-track {
  width: 100%;
  height: 10px;
  background: var(--nabi-peach);
  border-radius: var(--radius-btn);
  overflow: hidden;
}

.ds-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--nabi-pink), var(--nabi-coral));
  border-radius: inherit;
  transition: width 0.4s var(--ease);
  box-shadow: 0 0 12px color-mix(in srgb, var(--nabi-pink) 40%, transparent);
}