/* 心意卡 · 圣诞信箱 —— 移动优先 */
:root{
  --pine:#0a2f24;
  --pine-2:#0f4033;
  --wine:#8e1b1b;
  --wine-2:#b3251f;
  --gold:#d8ad5a;
  --gold-2:#f0d79a;
  --ink:#20261f;
  --ink-2:#5a655c;
  --line:rgba(216,173,90,.32);
  --glass:rgba(255,255,255,.06);
  --radius:18px;
  --shadow:0 18px 50px rgba(0,0,0,.35);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  margin:0;color:#f6f1e6;
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:
    radial-gradient(1200px 600px at 15% -10%, #14503f 0%, transparent 60%),
    radial-gradient(900px 500px at 110% 10%, #5d1414 0%, transparent 55%),
    linear-gradient(180deg, var(--pine) 0%, #071f19 100%);
  background-attachment:fixed;
  min-height:100vh;
}
/* 飘雪 */
.snow{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:0}
.snow i{
  position:absolute;top:-10px;width:6px;height:6px;border-radius:50%;
  background:rgba(255,255,255,.75);filter:blur(.3px);
  animation:fall linear infinite;
}
@keyframes fall{
  0%{transform:translateY(-10px) translateX(0);opacity:0}
  10%{opacity:.85}
  100%{transform:translateY(105vh) translateX(24px);opacity:0}
}
@media (prefers-reduced-motion: reduce){ .snow{display:none} }

.wrap{position:relative;z-index:1;max-width:560px;margin:0 auto;padding:28px 18px 56px}

/* 头部 */
.brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.brand svg{flex:0 0 auto}
.brand b{font:600 15px/1.2 Georgia,"Songti SC",serif;letter-spacing:.04em;color:var(--gold-2)}
.brand span{color:rgba(246,241,230,.55);font-size:12.5px}

h1{
  font:600 30px/1.25 Georgia,"Songti SC","STSong",serif;
  margin:6px 0 8px;letter-spacing:.01em;
  background:linear-gradient(180deg,#fff8e8,#e9c98a 70%,#c99b45);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
h1 small{display:block;font:400 13.5px/1.6 -apple-system,"PingFang SC",sans-serif;
  color:rgba(246,241,230,.6);letter-spacing:0;margin-top:8px;-webkit-text-fill-color:rgba(246,241,230,.6)}

/* 卡面 */
.card{
  position:relative;background:linear-gradient(180deg,rgba(255,255,255,.075),rgba(255,255,255,.03));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;box-shadow:var(--shadow);backdrop-filter:blur(6px);margin-top:18px;
}
.card::before{
  content:"";position:absolute;inset:6px;border:1px solid rgba(216,173,90,.16);
  border-radius:calc(var(--radius) - 8px);pointer-events:none;
}
.card.cream{background:linear-gradient(180deg,#f1dca6,#dfb872);border-color:rgba(180,140,70,.4);color:var(--ink)}
.card.cream::before{border-color:rgba(180,140,70,.18)}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 20px;border-radius:12px;border:1px solid transparent;
  font:600 15.5px/1 -apple-system,"PingFang SC",sans-serif;cursor:pointer;
  transition:transform .12s ease, background .18s, border-color .18s, box-shadow .18s;
  text-decoration:none;
}
.btn:active{transform:translateY(1px) scale(.995)}
.btn:focus-visible{outline:2px solid var(--gold-2);outline-offset:2px}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn-primary{background:linear-gradient(180deg,var(--wine-2),var(--wine));color:#fff3e2;
  box-shadow:0 8px 24px rgba(140,20,20,.45), inset 0 1px 0 rgba(255,255,255,.16)}
.btn-primary:hover{background:linear-gradient(180deg,#c22a22,#9a1d1d)}
.btn-gold{background:linear-gradient(180deg,var(--gold-2),var(--gold));color:#3a2a08;
  box-shadow:0 8px 24px rgba(180,140,70,.3), inset 0 1px 0 rgba(255,255,255,.5)}
.btn-gold:hover{background:linear-gradient(180deg,#f7e3b0,#dfb867)}
.btn-ghost{background:var(--glass);border-color:var(--line);color:#f0e8d8}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(216,173,90,.55)}
.btn-block{display:flex;width:100%}
.btn-sm{min-height:38px;font-size:14px;padding:0 14px;border-radius:10px}

/* 表单 */
.field{margin:16px 0}
.field > label{display:block;font-size:13.5px;font-weight:600;color:var(--gold-2);margin-bottom:8px;letter-spacing:.02em}
.field .hint{font-size:12.5px;color:rgba(246,241,230,.5);margin-top:6px}
input[type=text],input[type=password],textarea{
  width:100%;background:rgba(0,0,0,.22);border:1px solid var(--line);border-radius:12px;
  color:#fdf8ee;padding:13px 14px;font:16px/1.6 inherit;transition:border-color .18s, box-shadow .18s;
}
input::placeholder,textarea::placeholder{color:rgba(246,241,230,.35)}
input:focus,textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(216,173,90,.16)}
textarea{resize:vertical;min-height:110px}
.card.cream input,.card.cream textarea{background:#f3e5c2;border-color:rgba(180,140,70,.35);color:var(--ink)}

/* 字体选择 */
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  padding:8px 14px;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.05);color:#efe6d5;font-size:14px;cursor:pointer;
  transition:all .16s;
}
.chip:hover{border-color:rgba(216,173,90,.6)}
.chip.on{background:linear-gradient(180deg,var(--gold-2),var(--gold));color:#3a2a08;border-color:transparent;font-weight:600}

/* 录音 */
.rec{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.rec-dot{
  width:56px;height:56px;border-radius:50%;border:0;cursor:pointer;flex:0 0 auto;
  background:radial-gradient(circle at 35% 30%,#e35b4f,var(--wine));
  box-shadow:0 10px 26px rgba(150,30,30,.45), inset 0 1px 0 rgba(255,255,255,.25);
  display:grid;place-items:center;color:#fff;transition:transform .12s;
}
.rec-dot:active{transform:scale(.96)}
.rec-dot.on{animation:pulse 1.4s ease-in-out infinite;background:radial-gradient(circle at 35% 30%,#f07060,#a51c1c)}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(200,50,40,.55),0 10px 26px rgba(150,30,30,.45)}
  50%{box-shadow:0 0 0 14px rgba(200,50,40,0),0 10px 26px rgba(150,30,30,.45)}}
.rec-meta{font-variant-numeric:tabular-nums;font-size:14px;color:rgba(246,241,230,.7)}
.rec-meta b{color:#fff;font-size:17px}
audio{width:100%;margin-top:10px;filter:sepia(.18) saturate(.9)}

/* 手写板 */
.pad-wrap{position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#eedaa8}
canvas{display:block;width:100%;touch-action:none;cursor:crosshair}
.pad-tools{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.swatch{width:30px;height:30px;border-radius:50%;border:2px solid rgba(255,255,255,.25);cursor:pointer}
.swatch.on{box-shadow:0 0 0 2px var(--gold-2)}

/* 结果 */
.seal{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--gold-2);
  border:1px dashed rgba(216,173,90,.45);border-radius:999px;padding:5px 12px;margin-bottom:14px;
}
.letter{
  font-size:19px;line-height:1.95;color:#2a2015;white-space:pre-wrap;word-break:break-word;
  padding:6px 2px 2px;min-height:40px;
}
.letter.serif{font-family:Georgia,"Songti SC","STSong",serif}
.letter.kai{font-family:"Kaiti SC","KaiTi","STKaiti",serif}
.letter.round{font-family:"Yuanti SC","Hiragino Sans GB","PingFang SC",sans-serif}
.letter.tech{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.02em}
.sign{display:flex;justify-content:flex-end;align-items:baseline;gap:8px;margin-top:18px;
  padding-top:14px;border-top:1px dashed rgba(180,140,70,.35);color:#6b6047;font-size:14px}
.sign b{font:600 17px/1 Georgia,"Songti SC",serif;color:#8e1b1b}

.err{color:#ffb4a8;font-size:13.5px;margin-top:10px;min-height:18px}
.ok{color:#a8e6b8;font-size:13.5px;margin-top:10px}
.divider{display:flex;align-items:center;gap:12px;color:rgba(246,241,230,.35);font-size:12px;margin:22px 0}
.divider::before,.divider::after{content:"";height:1px;flex:1;background:rgba(255,255,255,.12)}

.foot{text-align:center;color:rgba(246,241,230,.32);font-size:12px;margin-top:34px;line-height:1.9}
.consent{display:flex;align-items:flex-start;gap:8px;font-size:12.5px;color:rgba(246,241,230,.62);margin-top:10px;line-height:1.5;cursor:pointer}
.consent input{margin-top:3px;flex:0 0 auto}
input[type=date]{width:100%;background:#123528;border:1px solid var(--line);border-radius:12px;color:#fdf8ee;padding:11px 14px;font:16px/1.6 inherit;color-scheme:dark;transition:border-color .18s, box-shadow .18s}
input[type=date]:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(216,173,90,.16)}
input[type=date]::-webkit-calendar-picker-indicator{filter:invert(0.85);cursor:pointer}
.beian{margin-top:6px;font-size:11.5px;color:rgba(246,241,230,.28)}
.beian a{color:inherit;text-decoration:none}
.report{display:inline-flex;align-items:center;gap:5px;background:none;border:none;color:rgba(246,241,230,.4);font-size:12.5px;cursor:pointer;padding:0;text-decoration:underline;text-underline-offset:3px}
.report:hover{color:rgba(246,241,230,.7)}
.policy h2{font-size:15px;color:var(--gold-2);margin:0 0 10px;font-weight:600}
.policy p{font-size:13.5px;color:rgba(246,241,230,.75);line-height:1.9;margin:6px 0}
.hide{display:none !important}
.spin{width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;
  border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}