/* =========================================================
   DUO-T base — reset + typography + 공통 컴포넌트
   ========================================================= */

@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.css');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%;
  min-height: 100vh;
  background: var(--bg-0);
  color: var(--txt);
  font-family: var(--font-sans);
  font-size: var(--fz-md);
  line-height: var(--lh-normal);
  letter-spacing: var(--tracking-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  /* 배경 분위기 — 두 색의 광원이 만나 보라색이 피어나는 인상 */
  background:
    radial-gradient(ellipse at 15% 10%, rgba(236, 72, 153, 0.20) 0, transparent 55%),
    radial-gradient(ellipse at 85% 15%, rgba(59, 130, 246, 0.18) 0, transparent 55%),
    radial-gradient(ellipse at 50% 100%, rgba(168, 85, 247, 0.20) 0, transparent 60%),
    var(--bg-0);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* 노이즈 텍스처 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  z-index: var(--z-orb);
  mix-blend-mode: overlay;
  opacity: 0.5;
}

a, button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  background: none;
  border: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible, a:focus-visible {
  outline: 2px solid var(--c-me);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

img, svg { display: block; max-width: 100%; }

/* ── 컨테이너 ─────────────────────────────────────── */
.dt-container {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 var(--sp-4);
}

@media (min-width: 768px) {
  .dt-container { max-width: 640px; padding: 0 var(--sp-5); }
}

/* ── 타이포 유틸 ──────────────────────────────────── */
.dt-display {
  font-size: clamp(var(--fz-3xl), 8vw, var(--fz-display));
  font-weight: 800;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
}
.dt-h1 {
  font-size: var(--fz-2xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
}
.dt-h2 {
  font-size: var(--fz-xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
}
.dt-body {
  font-size: var(--fz-md);
  line-height: var(--lh-normal);
}
.dt-caption {
  font-size: var(--fz-sm);
  color: var(--txt-dim);
  line-height: var(--lh-snug);
}
.dt-mono {
  font-family: var(--font-mono);
  letter-spacing: 0;
}

/* ── 버튼 시스템 ──────────────────────────────────── */
.dt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-pill);
  font-weight: 700;
  font-size: var(--fz-md);
  letter-spacing: var(--tracking-normal);
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
.dt-btn:active { transform: scale(0.97); }

.dt-btn-primary {
  background: linear-gradient(135deg, var(--c-me) 0%, var(--c-partner) 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(236, 72, 153, 0.3),
              0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}
.dt-btn-primary:hover {
  box-shadow: 0 12px 32px rgba(168, 85, 247, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.1) inset;
}

.dt-btn-ghost {
  background: var(--bg-glass);
  color: var(--txt);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.dt-btn-ghost:hover {
  background: var(--bg-glass-hi);
  border-color: var(--border-hi);
}

/* ── 카드 (글래스모피즘) ──────────────────────────── */
.dt-card {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* ── 진행률 바 ────────────────────────────────────── */
.dt-progress {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.dt-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-me), var(--c-partner));
  border-radius: var(--r-pill);
  transition: width var(--dur-base) var(--ease-out);
}

/* ── 광원 효과 (배경 떠다니는 orb) ──────────────────── */
.dt-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
  pointer-events: none;
  z-index: var(--z-orb);
}
.dt-orb.me      { background: var(--c-me);      width: 320px; height: 320px; top: -100px; left: -80px; }
.dt-orb.partner { background: var(--c-partner); width: 280px; height: 280px; bottom: -80px; right: -60px; }
.dt-orb.chem    { background: var(--c-chemistry); width: 220px; height: 220px; top: 40%; left: 50%; transform: translate(-50%, -50%); opacity: 0.18; }

@keyframes dt-float-1 { 0%,100% { transform: translate(0,0) } 50% { transform: translate(30px, -20px) } }
@keyframes dt-float-2 { 0%,100% { transform: translate(0,0) } 50% { transform: translate(-25px, 25px) } }
@keyframes dt-pulse   { 0%,100% { transform: translate(-50%, -50%) scale(1); } 50% { transform: translate(-50%, -50%) scale(1.15); } }
.dt-orb.me      { animation: dt-float-1 12s ease-in-out infinite; }
.dt-orb.partner { animation: dt-float-2 14s ease-in-out infinite; }
.dt-orb.chem    { animation: dt-pulse 8s ease-in-out infinite; }

/* ── 모션 감소 ────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── 공유 시트 (DUO-T용 dt-share-* 네임스페이스) ────── */
.dt-share-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(13, 10, 24, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}
.dt-share-overlay.open { opacity: 1; }

.dt-share-sheet {
  width: 100%;
  max-width: 480px;
  background: linear-gradient(180deg, rgba(38, 29, 68, 0.96), rgba(15, 12, 28, 0.98));
  border-top: 1px solid var(--border-hi);
  border-radius: 24px 24px 0 0;
  padding: var(--sp-5) var(--sp-5) calc(var(--sp-6) + env(safe-area-inset-bottom));
  position: relative;
  transform: translateY(20px);
  transition: transform var(--dur-base) var(--ease-out);
  box-shadow: 0 -20px 60px rgba(0, 0, 0, 0.5);
}
.dt-share-overlay.open .dt-share-sheet { transform: translateY(0); }

@media (min-width: 768px) {
  .dt-share-overlay { align-items: center; }
  .dt-share-sheet { border-radius: 24px; max-width: 420px; }
}

.dt-share-close {
  position: absolute;
  top: var(--sp-3);
  right: var(--sp-4);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--txt);
  font-size: 22px;
  line-height: 1;
  font-weight: 300;
  display: flex;
  align-items: center;
  justify-content: center;
}
.dt-share-close:hover { background: rgba(255, 255, 255, 0.15); }

.dt-share-title {
  font-size: var(--fz-lg);
  font-weight: 700;
  margin-bottom: var(--sp-2);
}
.dt-share-text {
  font-size: var(--fz-sm);
  color: var(--txt-dim);
  margin-bottom: var(--sp-5);
  line-height: var(--lh-snug);
  word-break: keep-all;
}

.dt-share-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}
.dt-share-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-2);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--txt);
  transition: all var(--dur-fast) var(--ease-out);
  font-size: var(--fz-xs);
}
.dt-share-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-hi);
  transform: translateY(-2px);
}
.dt-share-emoji {
  font-size: 24px;
  font-weight: 700;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--c-me), var(--c-partner));
  color: #fff;
}
.dt-share-label {
  font-size: 11px;
  color: var(--txt-dim);
  text-align: center;
  word-break: keep-all;
}

.dt-share-url {
  display: flex;
  gap: var(--sp-2);
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-1) var(--sp-1) var(--sp-1) var(--sp-3);
  align-items: center;
}
.dt-share-url-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--txt-dim);
  font-size: var(--fz-xs);
  font-family: var(--font-mono);
  outline: none;
  min-width: 0;
}
.dt-share-url-copy {
  background: var(--bg-glass-hi);
  color: var(--txt);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  font-size: var(--fz-xs);
  font-weight: 600;
  white-space: nowrap;
}
.dt-share-url-copy:hover { background: rgba(255, 255, 255, 0.18); }


/* ── Secondary CTA — '둘이 같이 시작' 같은 보조 prominent 버튼 ── */
.dt-btn-secondary {
  appearance: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 22px;
  border-radius: var(--r-pill, 999px);
  font-size: var(--fz-md, 16px);
  font-weight: 800;
  letter-spacing: -0.01em;
  background: rgba(255,255,255,0.04);
  color: var(--txt, #fff);
  border: 1.5px solid rgba(255,255,255,0.22);
  transition: background 200ms, border-color 200ms, transform 200ms;
  text-decoration: none;
}
.dt-btn-secondary:hover {
  background: rgba(168, 85, 247, 0.10);
  border-color: rgba(168, 85, 247, 0.55);
  transform: translateY(-1px);
}
.dt-btn-secondary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}