/* ============================================
   Soul Haven · Personal Letter MVP — 独立样式作用域
   原则：只作用于本体验页；不污染全局 style.css。
   信封视觉全部由 CSS/渐变/SVG 字符生成，不使用未授权网络图片。
   ============================================ */

/* ---------- 布局容器 ---------- */
.pl-app {
  --pl-max: 720px;
  color: var(--color-text, #3D3832);
}
.pl-shell {
  max-width: var(--pl-max);
  margin: 0 auto;
  padding: 56px 20px 72px;
}
.pl-eyebrow {
  text-align: center;
  letter-spacing: .18em;
  font-size: .78rem;
  color: var(--color-text-secondary, #7A7369);
  margin-bottom: 10px;
}
.pl-title {
  font-family: var(--font-serif, serif);
  font-size: clamp(1.7rem, 4.5vw, 2.3rem);
  font-weight: 600;
  text-align: center;
  margin: 0 0 18px;
  letter-spacing: .04em;
}
.pl-lead {
  text-align: center;
  color: var(--color-text-secondary, #7A7369);
  font-size: 1.02rem;
  line-height: 1.9;
  max-width: 520px;
  margin: 0 auto 30px;
}
.pl-note, .pl-privacy {
  font-size: .82rem;
  color: var(--color-text-muted, #B5ADA3);
  text-align: center;
  line-height: 1.7;
  margin: 14px auto 0;
  max-width: 520px;
}
.pl-trial-badge {
  display: inline-block;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--color-text-secondary, #7A7369);
  border: 1px solid var(--color-border, #E0D8CE);
  border-radius: 999px;
  padding: 4px 14px;
  margin: 0 auto 18px;
}
.pl-center { text-align: center; }

/* ---------- 按钮 ---------- */
.pl-btn {
  font-family: inherit;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font-size: .98rem;
  padding: 12px 26px;
  transition: transform .25s ease, background .25s ease, color .25s ease, box-shadow .25s ease;
}
.pl-btn:focus-visible { outline: 2px solid var(--color-accent, #C9876A); outline-offset: 3px; }
.pl-btn-primary {
  background: var(--color-accent, #C9876A);
  color: #fff;
  box-shadow: 0 10px 22px var(--color-shadow-accent, rgba(201,135,106,.16));
}
.pl-btn-primary:hover { background: var(--color-accent-hover, #B87352); transform: translateY(-1px); }
.pl-btn-soft {
  background: var(--color-accent-soft, #FAF0EA);
  color: var(--color-text, #3D3832);
  border: 1px solid var(--color-border-light, #EAE5DD);
}
.pl-btn-soft:hover { background: var(--color-accent-light, #F0D9CE); }
.pl-btn-ghost {
  background: transparent;
  color: var(--color-text-secondary, #7A7369);
  border: 1px solid var(--color-border, #E0D8CE);
}
.pl-btn-ghost:hover { border-color: var(--color-text-muted, #B5ADA3); }

/* ---------- 阶段显示 ---------- */
.pl-stage[hidden] { display: none !important; }

/* ---------- 表达页 ---------- */
.pl-question {
  font-family: var(--font-serif, serif);
  font-size: clamp(1.3rem, 3.6vw, 1.7rem);
  font-weight: 600;
  text-align: center;
  margin: 0 0 10px;
}
.pl-sub { text-align: center; color: var(--color-text-secondary, #7A7369); font-size: .98rem; line-height: 1.9; margin: 0 auto 26px; max-width: 520px; }
.pl-textarea {
  width: 100%;
  min-height: 170px;
  resize: vertical;
  border: 1px solid var(--color-border, #E0D8CE);
  border-radius: 16px;
  background: var(--color-bg-glass, rgba(255,255,255,.6));
  color: var(--color-text, #3D3832);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.9;
  padding: 16px 18px;
  box-sizing: border-box;
}
.pl-textarea:focus { outline: none; border-color: var(--color-accent, #C9876A); box-shadow: 0 0 0 3px var(--color-shadow-accent, rgba(201,135,106,.14)); }
.pl-hint { font-size: .85rem; color: var(--color-accent-hover, #B87352); margin: 10px 4px 0; text-align: left; }
.pl-express-actions { text-align: center; margin-top: 22px; }
.pl-kbd { font-size: .78rem; color: var(--color-text-muted, #B5ADA3); text-align: center; margin-top: 10px; }

/* ---------- 对话页 ---------- */
.pl-chat-header { font-size: .85rem; color: var(--color-text-muted, #B5ADA3); text-align: center; margin-bottom: 14px; letter-spacing: .06em; }
.pl-transcript {
  border: 1px solid var(--color-border-light, #EAE5DD);
  border-radius: 18px;
  background: var(--color-bg-glass, rgba(255,255,255,.5));
  padding: 18px;
  max-height: 52vh;
  overflow-y: auto;
}
.pl-bubble { margin-bottom: 14px; display: flex; }
.pl-user { justify-content: flex-end; }
.pl-user::before { content: ''; }
.pl-soul { justify-content: flex-start; align-items: flex-start; }
.pl-soul-badge {
  flex: 0 0 auto;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--color-accent, #C9876A);
  color: #fff;
  font-family: var(--font-serif, serif);
  font-size: .86rem;
  display: inline-flex; align-items: center; justify-content: center;
  margin-right: 10px;
  margin-top: 2px;
}
.pl-soul-text, .pl-user {
  max-width: 82%;
}
.pl-soul-text {
  background: var(--color-bg-card, #F0EBE3);
  border-radius: 4px 16px 16px 16px;
  padding: 11px 15px;
  line-height: 1.85;
  font-size: .96rem;
}
.pl-user {
  background: var(--color-accent-soft, #FAF0EA);
  border-radius: 16px 4px 16px 16px;
  padding: 11px 15px;
  line-height: 1.85;
  font-size: .96rem;
  max-width: 82%;
}
.pl-chat-area { margin-top: 14px; }
.pl-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.pl-chip {
  font-family: inherit;
  font-size: .86rem;
  border: 1px solid var(--color-border, #E0D8CE);
  background: var(--color-bg, #F7F4EF);
  color: var(--color-text, #3D3832);
  border-radius: 999px;
  padding: 7px 15px;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.pl-chip:hover { border-color: var(--color-accent, #C9876A); background: var(--color-accent-soft, #FAF0EA); }
.pl-composer { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.pl-composer-input {
  flex: 1 1 220px;
  border: 1px solid var(--color-border, #E0D8CE);
  border-radius: 999px;
  background: var(--color-bg, #F7F4EF);
  color: var(--color-text, #3D3832);
  font-family: inherit;
  font-size: .95rem;
  padding: 10px 16px;
  min-width: 0;
}
.pl-composer-input:focus { outline: none; border-color: var(--color-accent, #C9876A); }
.pl-skip {
  font-family: inherit;
  font-size: .82rem;
  color: var(--color-text-muted, #B5ADA3);
  background: none; border: none; cursor: pointer;
  text-decoration: underline;
  padding: 6px 4px;
}
.pl-chat-caption { font-size: .78rem; color: var(--color-text-muted, #B5ADA3); text-align: center; margin-top: 12px; }

/* ---------- 理解过渡 ---------- */
.pl-reading { text-align: center; padding: 40px 0; }
.pl-reading-lines { min-height: 120px; }
.pl-reading-line {
  font-family: var(--font-serif, serif);
  color: var(--color-text-secondary, #7A7369);
  font-size: 1.05rem;
  margin: 10px 0;
  animation: plFadeUp .7s ease both;
}
.pl-skip-wait { margin-top: 18px; }
.pl-skip-link {
  font-size: .84rem; color: var(--color-text-muted, #B5ADA3);
  text-decoration: underline; cursor: pointer; background: none; border: none; font-family: inherit;
}
@keyframes plFadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- 信封：4 种视觉气质 ---------- */
.pl-envelope {
  --pl-env: #E6E0D6;
  --pl-env-deep: #D4CCBF;
  --pl-env-inner: #F4EFE8;
  --pl-paper: #FCF9F4;
  --pl-ink: #3D3832;
  --pl-seal: #B58E66;
  --pl-line: #C6BCAD;
  --pl-accent: #B58E66;
  position: relative;
  width: min(340px, 86vw);
  aspect-ratio: 10 / 7;
  margin: 26px auto 18px;
  cursor: pointer;
  perspective: 1200px;
  user-select: none;
}
.pl-envelope[data-pl-theme="grey"] {
  --pl-env: #E8E2DA; --pl-env-deep: #D6CEC2; --pl-env-inner: #F2EDE6;
  --pl-paper: #FCF8F1; --pl-seal: #BE9C76; --pl-line: #C9BFB1; --pl-accent: #A98F72;
}
.pl-envelope[data-pl-theme="mistblue"] {
  --pl-env: #C7D4DC; --pl-env-deep: #AFC2CE; --pl-env-inner: #E2EAF0;
  --pl-paper: #F7F9F9; --pl-seal: #74899C; --pl-line: #9FB1BF; --pl-accent: #667E92;
}
.pl-envelope[data-pl-theme="coffee"] {
  --pl-env: #A08361; --pl-env-deep: #7E6547; --pl-env-inner: #C9AD87;
  --pl-paper: #F5E9D6; --pl-seal: #5C4630; --pl-line: #8C7356; --pl-accent: #6E563D;
}
.pl-envelope[data-pl-theme="dawn"] {
  --pl-env: #DDE4D5; --pl-env-deep: #C3D2BE; --pl-env-inner: #EDF1E3;
  --pl-paper: #FCFBF4; --pl-seal: #8AA184; --pl-line: #B4C4AD; --pl-accent: #6F8B6A;
}

.pl-env-back,
.pl-env-inner,
.pl-env-front {
  position: absolute;
  border-radius: 14px;
}
.pl-env-back { inset: 0; background: var(--pl-env-deep); box-shadow: 0 20px 44px rgba(0,0,0,.16); overflow: hidden; }
.pl-env-back::after {
  content: ""; position: absolute; inset: 0;
  opacity: .5; pointer-events: none;
  background:
    radial-gradient(circle at 20% 18%, rgba(255,255,255,.16), transparent 42%),
    radial-gradient(circle at 82% 80%, rgba(0,0,0,.06), transparent 46%);
}
.pl-env-inner { inset: 3px; background: linear-gradient(165deg, var(--pl-env-inner), var(--pl-env)); }
.pl-env-letter {
  position: absolute;
  left: 7%; right: 7%; top: 13%; bottom: 10%;
  background: var(--pl-paper);
  border-radius: 6px;
  z-index: 3;
  box-shadow: 0 12px 26px rgba(0,0,0,.16);
  padding: 8px 12px;
  box-sizing: border-box;
  transition: transform 1.3s cubic-bezier(.2, .8, .28, 1);
}
.pl-env-letter i {
  display: block; height: 7px; margin: 10px 4px;
  background: linear-gradient(90deg, rgba(61,56,50,.28), rgba(61,56,50,.05));
  border-radius: 3px;
}
.pl-env-letter i:nth-child(2) { width: 88%; }
.pl-env-letter i:nth-child(3) { width: 72%; }
.pl-env-front {
  left: 0; right: 0; bottom: 0; height: 56%;
  background: var(--pl-env);
  z-index: 4;
  border-radius: 0 0 14px 14px;
}
.pl-env-front::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 26px;
  background: linear-gradient(180deg, rgba(0,0,0,.10), transparent);
  pointer-events: none;
}
.pl-env-front::after {
  content: ""; position: absolute; inset: 0;
  border-radius: 0 0 14px 14px;
  background:
    radial-gradient(circle at 8% 0%, rgba(255,255,255,.16), transparent 40%),
    radial-gradient(circle at 92% 0%, rgba(255,255,255,.16), transparent 40%);
  pointer-events: none;
}
.pl-env-label {
  position: absolute;
  left: 12%; right: 12%; bottom: 7%;
  text-align: center;
  color: var(--color-text, #3D3832);
  z-index: 5;
}
.pl-env-to {
  font-family: var(--font-serif, serif);
  font-size: 1.02rem;
  letter-spacing: .12em;
}
.pl-env-date {
  font-size: .78rem;
  letter-spacing: .06em;
  opacity: .78;
  margin-top: 5px;
}
.pl-env-flap {
  position: absolute;
  left: 0; right: 0; top: 0; height: 54%;
  background: linear-gradient(180deg, var(--pl-env-deep), var(--pl-env));
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transition: transform 1s cubic-bezier(.3, .8, .3, 1);
  z-index: 5;
  backface-visibility: hidden;
}
.pl-env-flap::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--pl-env-inner), var(--pl-env));
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform: rotateX(180deg);
  backface-visibility: hidden;
}
.pl-env-seal {
  position: absolute;
  left: 50%; top: 46%;
  width: 58px; height: 58px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,.35), transparent 40%), var(--pl-seal);
  box-shadow: 0 8px 16px rgba(0,0,0,.22), inset 0 -3px 6px rgba(0,0,0,.18), inset 0 2px 4px rgba(255,255,255,.3);
  z-index: 6;
  display: flex; align-items: center; justify-content: center;
  transition: opacity .6s ease, transform .6s ease;
}
.pl-env-seal span {
  color: #fff;
  font-family: var(--font-hand, 'KaiTi', cursive);
  font-size: 1.15rem;
  text-shadow: 0 1px 2px rgba(0,0,0,.25);
}
.pl-envelope:hover .pl-env-seal { transform: translate(-50%, -50%) scale(1.03); }
.pl-envelope.is-open .pl-env-flap { transform: rotateX(178deg); }
.pl-envelope.is-open .pl-env-seal { opacity: 0; transform: translate(-50%, -50%) scale(.4); }
.pl-envelope.is-open .pl-env-letter { transform: translateY(-42%); }
.pl-env-caption { text-align: center; font-size: .86rem; color: var(--color-text-secondary, #7A7369); }
.pl-env-open-tip { text-align: center; font-size: .8rem; color: var(--color-text-muted, #B5ADA3); margin-top: 16px; }

/* ---------- 信纸 ---------- */
.pl-letter-sheet {
  background: linear-gradient(180deg, #FDFBF6, #F8F3EA);
  color: #3D3832;
  border: 1px solid var(--color-border-light, #EAE5DD);
  border-radius: 6px;
  box-shadow: 0 18px 40px rgba(61,56,50,.10);
  max-width: 600px;
  margin: 10px auto 26px;
  padding: clamp(22px, 5vw, 46px);
  font-family: var(--font-serif, serif);
}
.pl-letter-meta {
  font-size: .82rem;
  letter-spacing: .1em;
  color: #A49A8C;
  border-bottom: 1px solid #EBE3D6;
  padding-bottom: 14px;
  margin: 0 0 22px;
}
.pl-letter-first {
  font-size: 1.28rem;
  line-height: 1.8;
  font-weight: 600;
  margin: 0 0 18px;
  animation: plFadeUp 1s ease both;
}
.pl-letter-body p {
  font-size: 1.02rem;
  line-height: 2.05;
  margin: 0 0 16px;
  animation: plFadeUp 1s ease both;
}
.pl-letter-body p:nth-child(2) { animation-delay: .08s; }
.pl-letter-body p:nth-child(3) { animation-delay: .16s; }
.pl-letter-body p:nth-child(4) { animation-delay: .24s; }
.pl-letter-body p:nth-child(5) { animation-delay: .32s; }
.pl-letter-sign { margin-top: 26px; text-align: right; font-weight: 600; }
.pl-letter-fig {
  font-size: .8rem;
  color: #A49A8C;
  line-height: 1.8;
  border-top: 1px dashed #E4DACB;
  padding-top: 12px;
}

/* ---------- 付费入口（预留） ---------- */
.pl-after { text-align: center; max-width: 560px; margin: 8px auto 0; }
.pl-after h3 { font-family: var(--font-serif, serif); font-size: 1.2rem; font-weight: 600; margin: 0 0 12px; }
.pl-after p { color: var(--color-text-secondary, #7A7369); line-height: 1.9; font-size: .96rem; }
.pl-after-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 22px; }
.pl-pay-tip { font-size: .84rem; color: var(--color-accent-hover, #B87352); margin-top: 14px; }
.pl-after .pl-note { margin-top: 20px; }
.pl-after .pl-note a { color: var(--color-accent, #C9876A); }

/* ---------- 危机提示 ---------- */
.pl-crisis { text-align: center; max-width: 560px; margin: 30px auto; }
.pl-crisis h2 { font-family: var(--font-serif, serif); font-size: 1.4rem; margin: 0 0 16px; }
.pl-crisis p { line-height: 2; color: var(--color-text-secondary, #7A7369); }
.pl-crisis .pl-after-actions { margin-top: 26px; }

/* ---------- 动画偏好：减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .pl-envelope.is-open .pl-env-letter,
  .pl-envelope .pl-env-flap,
  .pl-envelope .pl-env-seal,
  .pl-letter-first,
  .pl-letter-body p {
    transition-duration: .01s !important;
    animation-duration: .01s !important;
  }
}

/* ---------- 移动端 ---------- */
@media (max-width: 560px) {
  .pl-shell { padding: 40px 16px 56px; }
  .pl-soul-text, .pl-user { max-width: 90%; }
}

/* ---------- 把信寄到邮箱 ---------- */
.pl-mail { text-align: center; max-width: 560px; margin: 26px auto 0; }
.pl-mail-title { font-family: var(--font-serif, serif); font-size: 1.08rem; font-weight: 600; margin: 0 0 12px; }
.pl-mail-row { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.pl-mail-row .pl-composer-input { flex: 1 1 220px; max-width: 320px; }