/* ═══════════════════════════════════════════════════════
   见字如面 · 我们的信件
   温暖信纸风 — 米纸、麻绳、封蜡、邮戳
   ═══════════════════════════════════════════════════════ */

:root {
  --paper:      #f4ecdb;
  --paper-hi:   #faf4e6;
  --paper-lo:   #e8dcc2;
  --ink:        #40311f;
  --ink-soft:   #7a6647;
  --ink-faint:  #b3a184;
  --seal:       #a13d2d;
  --seal-deep:  #7c2a1d;
  --kraft:      #c8a672;
  --kraft-deep: #9c7a48;
  --rope:       #8a6d4b;
  --gold:       #b08d57;
  --rose:       #b06f62;
  --card-me:    #f8f1de;
  --card-her:   #f7ece1;
  --media-h:    480px;

  --f-display: "KaiTi","STKaiti","Kaiti SC","DFKai-SB","Noto Serif SC","Songti SC",serif;
  --f-body:    "FangSong","STFangsong","FangSong_GB2312","KaiTi","STKaiti","Noto Serif SC",serif;

  --shadow-card: 0 1px 2px rgba(64,49,31,.10), 0 10px 26px -12px rgba(64,49,31,.38);
}

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

html { scroll-behavior:smooth; }

body {
  font-family: var(--f-body);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 90% 60% at 50% -8%, rgba(255,250,235,.85), transparent 60%),
    radial-gradient(ellipse 120% 90% at 50% 115%, rgba(140,110,70,.18), transparent 55%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.30 0 0 0 0 0.23 0 0 0 0 0.12 0 0 0 0.045 0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
  min-height: 100vh;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.hidden { display:none !important; }

::selection { background: rgba(161,61,45,.22); }

button { font-family: inherit; cursor:pointer; }
input, textarea { font-family: inherit; color: var(--ink); }

/* ───────────── 密码门 ───────────── */

.gate {
  position: fixed; inset:0; z-index: 100;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(255,250,235,.7), transparent 65%),
    var(--paper);
  transition: opacity .9s ease, visibility .9s;
}
.gate.gone { opacity:0; visibility:hidden; pointer-events:none; }

.gate-inner { display:flex; flex-direction:column; align-items:center; gap:34px; }

/* 信封 */
.envelope {
  position:relative; width: 292px; height: 190px;
  perspective: 900px;
  filter: drop-shadow(0 18px 28px rgba(64,49,31,.28));
  animation: envFloat 5.5s ease-in-out infinite;
}
@keyframes envFloat {
  0%,100% { transform: translateY(0) rotate(-.6deg); }
  50%     { transform: translateY(-9px) rotate(.5deg); }
}
.env-body {
  position:absolute; inset:0;
  background: linear-gradient(165deg, #efe3c8 0%, #e6d6b4 55%, #dfcda6 100%);
  border: 1px solid rgba(122,102,71,.35);
  border-radius: 4px;
}
.env-body::before, .env-body::after {
  content:""; position:absolute; bottom:0; width:52%; height:96%;
  background: linear-gradient(160deg, rgba(250,244,230,.35), rgba(223,205,166,.05));
}
.env-body::before { left:0;  clip-path: polygon(0 0, 100% 100%, 0 100%); border-left:1px solid rgba(122,102,71,.25); }
.env-body::after  { right:0; clip-path: polygon(100% 0, 100% 100%, 0 100%); border-right:1px solid rgba(122,102,71,.25); }

.env-letter {
  position:absolute; left:8%; right:8%; top:6%; bottom:12%;
  background: var(--paper-hi);
  border:1px solid rgba(122,102,71,.25);
  border-radius:2px;
  display:flex; align-items:center; justify-content:center;
  transition: transform .8s cubic-bezier(.2,.8,.2,1);
  z-index:1;
}
.env-letter span {
  font-family: var(--f-display);
  font-size: 22px; letter-spacing: .5em; text-indent:.5em;
  color: var(--ink-soft); opacity:.85;
}

.env-flap {
  position:absolute; left:0; right:0; top:0; height:56%;
  background: linear-gradient(180deg, #ecdfc2, #e2d1ac);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transition: transform .85s cubic-bezier(.55,.05,.3,1);
  z-index:3;
  border-radius: 4px 4px 0 0;
}
.envelope.open .env-flap { transform: rotateX(178deg); z-index:0; }
.envelope.open .env-letter { transform: translateY(-46%); }

.seal {
  position:absolute; left:50%; top:49%;
  width:64px; height:64px;
  transform: translate(-50%,-50%) rotate(-8deg);
  z-index:4;
  border-radius: 47% 53% 51% 49% / 52% 48% 52% 48%;
  background:
    radial-gradient(circle at 34% 30%, rgba(255,225,210,.5), transparent 42%),
    radial-gradient(circle at 50% 55%, var(--seal) 0%, var(--seal-deep) 82%);
  box-shadow: 0 3px 8px rgba(64,20,10,.45), inset 0 -2px 6px rgba(60,10,0,.35), inset 0 2px 4px rgba(255,180,150,.35);
  display:flex; align-items:center; justify-content:center;
  transition: transform .5s ease, opacity .5s ease;
}
.seal span {
  font-family: var(--f-display);
  color:#f6e3d2; font-size:26px;
  text-shadow: 0 1px 2px rgba(60,10,0,.55);
}
.envelope.open .seal { transform: translate(-50%,-30%) scale(.4) rotate(-30deg); opacity:0; }

/* 密码表单 */
.gate-form {
  display:flex; flex-direction:column; align-items:center; gap:12px;
  width: min(320px, 86vw);
}
.gate-label {
  font-family: var(--f-display);
  font-size:15px; letter-spacing:.32em; text-indent:.32em;
  color: var(--ink-soft);
}
.gate-passline { position:relative; width:100%; }
.gate-input {
  width:100%; text-align:center;
  background: transparent; border:none;
  border-bottom: 1.5px solid var(--ink-faint);
  font-size:20px; letter-spacing:.55em; text-indent:.55em;
  padding:8px 44px 6px 4px;
  outline:none;
  transition: border-color .3s;
}
.gate-input:focus { border-color: var(--seal); }
.gate-eye {
  position:absolute; right:0; top:50%;
  transform: translateY(-50%);
  background:none; border:none;
  font-family: var(--f-display);
  font-size:13px; letter-spacing:.1em;
  color: var(--ink-faint);
  padding: 8px 6px;
  line-height:1;
  transition: color .25s;
}
.gate-eye:hover { color: var(--seal); }
.gate-btn {
  margin-top:10px;
  font-family: var(--f-display);
  font-size:16px; letter-spacing:.6em; text-indent:.6em;
  color:#f6e3d2;
  padding:10px 34px;
  border:none; border-radius:3px;
  background: linear-gradient(160deg, var(--seal), var(--seal-deep));
  box-shadow: 0 4px 12px -3px rgba(124,42,29,.55), inset 0 1px 1px rgba(255,200,170,.4);
  transition: transform .2s, box-shadow .2s;
}
.gate-btn:hover { transform: translateY(-1px); box-shadow: 0 7px 16px -4px rgba(124,42,29,.6), inset 0 1px 1px rgba(255,200,170,.4); }
.gate-btn:active { transform: translateY(1px); }
.gate-err { color: var(--seal); font-size:14px; min-height:1.6em; letter-spacing:.12em; }
.gate.shake .gate-form { animation: shake .45s ease; }
@keyframes shake {
  0%,100% { transform: translateX(0); }
  22% { transform: translateX(-9px); } 44% { transform: translateX(8px); }
  66% { transform: translateX(-5px); } 88% { transform: translateX(4px); }
}
.gate-foot {
  position:absolute; bottom:26px;
  font-size:13px; letter-spacing:.35em; text-indent:.35em;
  color: var(--ink-faint);
}

/* ───────────── 页眉 ───────────── */

.app { max-width: 1060px; margin: 0 auto; padding: 0 20px; }

.masthead { text-align:center; padding: 66px 0 26px; }
.postmark { color: var(--seal); display:inline-block; transform: rotate(-7deg); opacity:.85; }
.masthead-title {
  font-family: var(--f-display);
  font-size: clamp(40px, 7vw, 60px);
  font-weight: 700;
  letter-spacing: .28em; text-indent:.28em;
  margin-top:14px;
  color: var(--ink);
  text-shadow: 0 1px 0 rgba(255,252,240,.8);
}
.masthead-sub {
  margin-top:8px;
  font-size:16px; letter-spacing:.5em; text-indent:.5em;
  color: var(--ink-soft);
}
.masthead-motto {
  margin-top:16px;
  font-family: var(--f-display);
  font-size:15px; letter-spacing:.32em; text-indent:.32em;
  color: var(--rose); opacity:.82;
}
.rule {
  display:flex; align-items:center; justify-content:center; gap:14px;
  margin: 22px auto; width:min(420px,70%);
}
.rule::before, .rule::after {
  content:""; height:1px; flex:1;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}
.rule-diamond { color: var(--gold); font-size:12px; }

.masthead-actions { display:flex; gap:14px; justify-content:center; align-items:center; flex-wrap:wrap; }

.btn-seal {
  font-family: var(--f-display);
  font-size:15px; letter-spacing:.22em; text-indent:.22em;
  color:#f6e3d2; border:none; border-radius:3px;
  padding: 9px 22px;
  background: linear-gradient(160deg, var(--seal), var(--seal-deep));
  box-shadow: 0 4px 12px -3px rgba(124,42,29,.5), inset 0 1px 1px rgba(255,200,170,.4);
  transition: transform .2s, box-shadow .2s;
}
.btn-seal:hover { transform: translateY(-1px); }
.btn-seal:active { transform: translateY(1px); }
.btn-seal.big { width:100%; padding:12px; font-size:16px; margin-top:6px; }
.btn-seal:disabled { opacity:.55; cursor:wait; transform:none; }

.btn-ghost {
  background:transparent; border:1px solid var(--ink-faint);
  color: var(--ink-soft); border-radius:3px;
  padding: 9px 18px; font-size:14px; letter-spacing:.2em; text-indent:.2em;
  transition: border-color .25s, color .25s, background .25s;
}
.btn-ghost:hover { border-color: var(--seal); color: var(--seal); background: rgba(161,61,45,.05); }

.masthead-count { margin-top:18px; font-size:14.5px; letter-spacing:.2em; color: var(--ink-faint); }

/* ───────────── 时间线 ───────────── */

.timeline { position:relative; padding: 30px 0 60px; }

.rope {
  position:absolute; top:0; bottom:0; left:50%;
  width:3px; transform:translateX(-50%);
  background:
    repeating-linear-gradient(180deg, var(--rope) 0 7px, transparent 7px 12px),
    linear-gradient(180deg, transparent, rgba(138,109,75,.25) 30px, rgba(138,109,75,.25) calc(100% - 30px), transparent);
  opacity:.8;
  border-radius:2px;
}

.items { position:relative; display:flex; flex-direction:column; gap:52px; }

/* 年份分隔 */
.year-mark {
  position:relative; z-index:2;
  display:flex; justify-content:center;
}
.year-mark span {
  font-family: var(--f-display);
  background: var(--paper-hi);
  border:1px solid var(--kraft-deep);
  color: var(--kraft-deep);
  padding: 5px 26px;
  font-size:19px; letter-spacing:.4em; text-indent:.4em;
  border-radius: 40% 8% 40% 8% / 30% 10% 30% 10%;
  box-shadow: 0 3px 10px -4px rgba(64,49,31,.4);
  transform: rotate(-1deg);
}

/* 一封信 */
.letter {
  position:relative;
  width: calc(50% - 52px);
  opacity:0; transform: translateY(26px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.2,.8,.2,1);
}
.letter.in { opacity:1; transform: translateY(0); }
.letter.side-me  { align-self:flex-start; }
.letter.side-her { align-self:flex-end; }

/* 麻绳上的结 */
.letter::before {
  content:""; position:absolute; top:30px;
  width:11px; height:11px; border-radius:50%;
  background: radial-gradient(circle at 35% 30%, #b5905f, var(--rope) 70%);
  box-shadow: 0 1px 3px rgba(64,49,31,.5);
  z-index:2;
}
.letter.side-me::before  { right:-58px; }
.letter.side-her::before { left:-58px; }
/* 系绳 */
.letter::after {
  content:""; position:absolute; top:35px;
  width:52px; height:1.5px;
  background: linear-gradient(90deg, rgba(138,109,75,.15), var(--rope));
}
.letter.side-me::after  { right:-52px; transform: rotate(-4deg); }
.letter.side-her::after { left:-52px; transform: rotate(4deg); background: linear-gradient(270deg, rgba(138,109,75,.15), var(--rope)); }

/* 日期吊牌 */
.tag {
  display:inline-block;
  position:relative;
  background: linear-gradient(150deg, #d8bc8e, var(--kraft));
  color:#4c3a1e;
  font-family: var(--f-display);
  font-size:14.5px; letter-spacing:.14em;
  padding: 4px 14px 4px 22px;
  border-radius: 3px 10px 10px 3px;
  box-shadow: 0 2px 6px -2px rgba(64,49,31,.45);
  margin-bottom:10px;
  transform: rotate(-1.5deg);
}
.tag::before {
  content:""; position:absolute; left:8px; top:50%;
  width:5px; height:5px; border-radius:50%;
  transform:translateY(-50%);
  background: var(--paper);
  box-shadow: inset 0 0 0 1px rgba(76,58,30,.55);
}
.letter.side-her .tag { transform: rotate(1.5deg); border-radius: 10px 3px 3px 10px; padding: 4px 22px 4px 14px; }
.letter.side-her .tag::before { left:auto; right:8px; }

/* 信纸卡片 */
.card {
  position:relative;
  background:
    linear-gradient(165deg, rgba(255,251,240,.5), rgba(230,214,180,.25)),
    var(--card-me);
  border:1px solid rgba(122,102,71,.28);
  border-radius: 3px 7px 4px 8px;
  box-shadow: var(--shadow-card);
  padding: 22px 22px 14px;
  transform: rotate(-.8deg);
  transition: transform .35s cubic-bezier(.2,.8,.2,1), box-shadow .35s;
}
.letter.side-her .card {
  background:
    linear-gradient(165deg, rgba(255,248,240,.5), rgba(232,206,190,.28)),
    var(--card-her);
  transform: rotate(.8deg);
}
.letter:hover .card {
  transform: rotate(0deg) translateY(-4px);
  box-shadow: 0 2px 3px rgba(64,49,31,.08), 0 22px 38px -14px rgba(64,49,31,.45);
}

/* 胶带 */
.tape {
  position:absolute; top:-11px; left:50%;
  width:86px; height:24px;
  transform: translateX(-50%) rotate(-2deg);
  background: rgba(200,166,114,.42);
  border-left:1px dashed rgba(122,102,71,.3);
  border-right:1px dashed rgba(122,102,71,.3);
  backdrop-filter: blur(1px);
}

.card-head {
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  margin-bottom:8px;
}
.stamp {
  font-family: var(--f-display);
  font-size:13px; letter-spacing:.2em; text-indent:.2em;
  padding: 3px 10px;
  border:1.5px solid currentColor; border-radius:2px;
  transform: rotate(-3deg);
  opacity:.85;
}
.stamp-me  { color: var(--ink-soft); }
.stamp-her { color: var(--rose); }
.card-date { font-size:14px; color: var(--ink-faint); letter-spacing:.08em; white-space:nowrap; }

.card-title {
  font-family: var(--f-display);
  font-size:23px; font-weight:700;
  letter-spacing:.08em;
  margin: 2px 0 10px;
  color: var(--ink);
}

.card-media { border-radius:2px; }
.media-viewport {
  position:relative;
  background:#fff; padding:8px;
  border:1px solid rgba(122,102,71,.3);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.6), 0 3px 10px -4px rgba(64,49,31,.35);
  border-radius:2px;
}
.media-viewport img {
  display:block; width:100%;
  transition: filter .35s;
}
.media-viewport:hover img { filter: sepia(.18) contrast(1.02); }

/* 长信：变成一扇固定高度的窗，可上下拖动挑段落 */
.media-viewport.pannable { height: var(--media-h); overflow:hidden; }
.media-viewport.pannable img {
  height:100%;
  object-fit:cover; object-position:50% 0%;
  cursor:grab; touch-action:none;
  -webkit-user-drag:none; user-select:none;
}
.media-viewport.pannable img.grabbing { cursor:grabbing; filter:none; }
.media-viewport.pannable::before,
.media-viewport.pannable::after {
  content:""; position:absolute; left:0; right:0; height:30px;
  pointer-events:none; z-index:2;
}
.media-viewport.pannable::before { top:0; background: linear-gradient(180deg, rgba(255,255,255,.9), rgba(255,255,255,0)); }
.media-viewport.pannable::after  { bottom:0; background: linear-gradient(0deg, rgba(255,255,255,.9), rgba(255,255,255,0)); }

.media-grip {
  display:flex; align-items:center; justify-content:center; gap:9px;
  margin-top:9px;
  font-size:13px; letter-spacing:.14em;
  color: var(--ink-faint);
}
.media-grip .grip-line {
  width:28px; height:1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.pdf-card {
  display:flex; align-items:center; gap:14px;
  background: rgba(250,244,230,.7);
  border:1px solid rgba(122,102,71,.3);
  padding: 14px 16px;
  cursor:pointer;
  transition: background .3s;
}
.pdf-card:hover { background: rgba(250,244,230,1); }
.pdf-icon {
  flex:0 0 auto; width:44px; height:56px;
  background: linear-gradient(160deg, #efe3c8, #e2d1ac);
  border:1px solid var(--kraft-deep);
  border-radius:2px 6px 2px 2px;
  position:relative;
  display:flex; align-items:flex-end; justify-content:center;
  padding-bottom:7px;
  font-size:10px; letter-spacing:.1em; color: var(--seal);
  font-weight:bold;
}
.pdf-icon::before {
  content:""; position:absolute; top:0; right:0;
  border-style:solid; border-width:0 12px 12px 0;
  border-color: transparent var(--paper-lo) transparent transparent;
  filter: drop-shadow(-1px 1px 0 rgba(122,102,71,.4));
}
.pdf-name { font-size:15px; color: var(--ink-soft); word-break:break-all; line-height:1.5; }
.pdf-hint { font-size:13px; color: var(--ink-faint); margin-top:3px; letter-spacing:.15em; }

.card-note {
  margin-top:10px; padding-top:9px;
  border-top:1px dashed rgba(122,102,71,.35);
  font-size:16px; color: var(--ink-soft);
  letter-spacing:.04em;
}

.card-actions {
  display:flex; gap:4px; justify-content:flex-end;
  margin-top:10px;
}
.act {
  background:none; border:none;
  font-family: var(--f-display);
  font-size:14.5px; letter-spacing:.16em; text-indent:.16em;
  color: var(--ink-faint);
  padding: 4px 10px;
  text-decoration:none;
  border-radius:2px;
  transition: color .25s, background .25s;
}
.act:hover { color: var(--seal); background: rgba(161,61,45,.07); }
.act-del:hover { color: #fff; background: var(--seal); }
.act-del.armed { color:#fff; background: var(--seal); animation: pulse 1s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 4px rgba(161,61,45,.18); } }

/* 空信箱 */
.empty { text-align:center; padding: 60px 0 40px; }
.empty-env {
  font-size:46px; color: var(--ink-faint);
  transform: rotate(-6deg);
  margin-bottom:14px;
  animation: envFloat 5s ease-in-out infinite;
}
.empty p { font-family: var(--f-display); font-size:20px; letter-spacing:.3em; text-indent:.3em; color: var(--ink-soft); }
.empty-sub { font-size:15px !important; color: var(--ink-faint) !important; margin-top:6px; }

.footer { text-align:center; padding: 10px 0 56px; }
.footer p { font-size:14px; letter-spacing:.4em; text-indent:.4em; color: var(--ink-faint); }

/* ───────────── 上传弹窗 ───────────── */

.modal { position:fixed; inset:0; z-index:60; display:flex; align-items:center; justify-content:center; padding:20px; }
.modal-backdrop {
  position:absolute; inset:0;
  background: rgba(52,38,22,.45);
  backdrop-filter: blur(3px) sepia(.2);
  animation: fadeIn .35s ease;
}
@keyframes fadeIn { from { opacity:0; } }

.modal-sheet {
  position:relative;
  width: min(500px, 94vw);
  max-height: 92vh; overflow:auto;
  background:
    linear-gradient(168deg, rgba(255,251,240,.6), rgba(232,220,194,.3)),
    var(--paper-hi);
  border:1px solid rgba(122,102,71,.35);
  border-radius: 4px 12px 6px 10px;
  box-shadow: 0 30px 60px -20px rgba(40,28,14,.55);
  padding: 30px 30px 26px;
  animation: sheetIn .45s cubic-bezier(.2,.9,.25,1.1);
}
@keyframes sheetIn { from { opacity:0; transform: translateY(26px) rotate(-1deg); } }

.modal-close {
  position:absolute; top:10px; right:12px;
  background:none; border:none;
  font-size:24px; color: var(--ink-faint);
  line-height:1; padding:6px;
  transition: color .25s, transform .25s;
}
.modal-close:hover { color: var(--seal); transform: rotate(90deg); }

.modal-title {
  font-family: var(--f-display);
  font-size:26px; letter-spacing:.3em; text-indent:.3em;
  text-align:center;
}
.modal-sub { text-align:center; font-size:13px; color: var(--ink-faint); letter-spacing:.12em; margin: 4px 0 18px; }

.dropzone {
  display:block;
  border:1.5px dashed var(--ink-faint);
  border-radius:4px;
  background: rgba(250,244,230,.5);
  cursor:pointer;
  transition: border-color .3s, background .3s;
  margin-bottom:16px;
}
.dropzone.over { border-color: var(--seal); background: rgba(161,61,45,.06); }
.dz-inner {
  display:flex; flex-direction:column; align-items:center; gap:4px;
  padding: 26px 16px;
  text-align:center;
}
.dz-icon { font-size:30px; color: var(--gold); transform: rotate(-6deg); }
.dz-text { font-family: var(--f-display); font-size:16px; letter-spacing:.2em; text-indent:.2em; color: var(--ink-soft); }
.dz-hint { font-size:12px; color: var(--ink-faint); letter-spacing:.08em; }
.dz-preview { display:flex; align-items:center; gap:14px; padding: 16px; }
.dz-preview img { width:74px; height:74px; object-fit:cover; border:4px solid #fff; box-shadow: 0 2px 8px rgba(64,49,31,.3); transform: rotate(-2deg); }
.dz-pdf-badge { width:52px; height:64px; flex:0 0 auto; }
.dz-file-info { text-align:left; word-break:break-all; }
.dz-file-info .n { font-size:14px; color: var(--ink); }
.dz-file-info .s { font-size:12px; color: var(--ink-faint); margin-top:2px; }
.dz-file-info .r { font-size:12px; color: var(--seal); margin-top:4px; letter-spacing:.1em; }

.field { margin-bottom:14px; flex:1; }
.field label {
  display:block; font-size:13.5px; color: var(--ink-soft);
  letter-spacing:.22em; margin-bottom:5px;
}
.field label small { color: var(--ink-faint); letter-spacing:.05em; }
.field input[type="date"], .field input[type="text"], .field textarea {
  width:100%;
  background: rgba(255,252,244,.75);
  border:1px solid rgba(122,102,71,.35);
  border-radius:3px;
  padding: 9px 11px;
  font-size:15px;
  outline:none;
  transition: border-color .25s, box-shadow .25s;
}
.field input:focus, .field textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(176,141,87,.15);
}
.field textarea { resize:vertical; min-height:52px; }
.field-row { display:flex; gap:16px; }

.sender-opts { display:flex; gap:10px; }
.sender-opt input { display:none; }
.sender-opt span {
  display:inline-block;
  font-size:14px; letter-spacing:.12em;
  padding: 8px 14px;
  border:1px solid rgba(122,102,71,.4);
  border-radius:3px;
  color: var(--ink-soft);
  background: rgba(255,252,244,.6);
  transition: all .25s;
  cursor:pointer;
}
.sender-opt input:checked + span {
  color:#f6e3d2; background: linear-gradient(160deg, var(--seal), var(--seal-deep));
  border-color: var(--seal-deep);
  box-shadow: 0 3px 8px -2px rgba(124,42,29,.5);
}
.sender-opt:last-child input:checked + span {
  background: linear-gradient(160deg, var(--rose), #95564a);
  border-color:#95564a;
  box-shadow: 0 3px 8px -2px rgba(149,86,74,.5);
}

.form-msg { text-align:center; margin-top:10px; font-size:13.5px; min-height:1.5em; letter-spacing:.1em; }
.form-msg.err { color: var(--seal); }
.form-msg.ok { color:#5c7a4a; }

/* ───────────── 灯箱 ───────────── */

.lightbox {
  position:fixed; inset:0; z-index:80;
  background: rgba(24,16,8,.9);
  display:flex; align-items:center; justify-content:center;
  padding:30px; cursor: zoom-out;
  animation: fadeIn .3s ease;
}
.lb-frame { text-align:center; max-width: 92vw; }
.lb-frame img {
  max-width: min(88vw, 900px); max-height: 78vh;
  background:#fdfaf2; padding: 14px 14px 10px;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,.8);
  transform: rotate(-.6deg);
  animation: sheetIn .4s cubic-bezier(.2,.9,.25,1.05);
}
.lb-caption {
  margin-top:16px; color:#d8c9ab;
  font-family: var(--f-display);
  letter-spacing:.3em; text-indent:.3em; font-size:14px;
}

/* ───────────── 响应式 ───────────── */

@media (max-width: 720px) {
  :root { --media-h: 400px; }
  .app { padding: 0 14px; }
  .masthead { padding-top:44px; }
  .rope { left:20px; transform:none; }
  .letter, .letter.side-me, .letter.side-her {
    width: auto; align-self:stretch;
    margin-left:46px;
  }
  .letter::before, .letter.side-me::before, .letter.side-her::before { left:-32px; right:auto; }
  .letter::after, .letter.side-me::after, .letter.side-her::after {
    left:-26px; right:auto; width:26px; transform:none;
    background: linear-gradient(270deg, rgba(138,109,75,.15), var(--rope));
  }
  .field-row { flex-direction:column; gap:0; }
  .envelope { transform: scale(.88); }
}