/* =========================================================
   我们的树 · 样式
   色调：月白 / 雾青 / 藕粉 / 浅金（低饱和、柔光、有空气感）
   深色模式：夜色青蓝 + 星点微光
   动效：缓慢柔软，过渡 ≥ 400ms，ease-in-out / 自定义 cubic-bezier
   ========================================================= */

:root {
  --bg: #F5F3EE;
  --bg-2: #FBFAF7;
  --mist: #B8C9C9;
  --mist-deep: #9BB0B0;
  --lotus: #E3C5C5;
  --gold: #C9A86A;
  --gold-soft: #E2C993;
  --ink: #4A4A48;
  --ink-soft: #8C8C86;
  --line: rgba(120, 120, 110, 0.18);
  --card: rgba(255, 255, 255, 0.55);
  --shadow: 0 18px 60px -28px rgba(80, 90, 90, 0.4);
  --serif: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'STSong', serif;
  --sans: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t: 0.6s;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0E1726;
    --bg-2: #142033;
    --mist: #4C6475;
    --mist-deep: #5E7A8C;
    --lotus: #6E5A66;
    --gold: #D8B97A;
    --gold-soft: #C9A86A;
    --ink: #DCE6EC;
    --ink-soft: #8FA0AE;
    --line: rgba(180, 200, 210, 0.14);
    --card: rgba(28, 42, 60, 0.5);
    --shadow: 0 24px 70px -30px rgba(0, 0, 0, 0.6);
  }
}

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

html, body { height: 100%; }

body {
  font-family: var(--serif);
  color: var(--ink);
  background: var(--bg);
  overflow: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}

/* ---------- 背景柔光与颗粒 ---------- */
.aurora {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(60% 50% at 25% 18%, var(--lotus) 0%, transparent 60%),
    radial-gradient(55% 45% at 80% 25%, var(--mist) 0%, transparent 62%),
    radial-gradient(70% 60% at 50% 100%, var(--gold-soft) 0%, transparent 65%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  opacity: 0.85;
  filter: blur(8px) saturate(0.9);
  animation: breath 18s var(--ease) infinite alternate;
}
@keyframes breath { from { opacity: 0.7; transform: scale(1); } to { opacity: 0.92; transform: scale(1.04); } }

.grain {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

#fx-layer { position: fixed; inset: 0; z-index: 50; pointer-events: none; width: 100%; height: 100%; }

/* ---------- 屏 ---------- */
.screen { position: fixed; inset: 0; z-index: 10; display: flex; align-items: center; justify-content: center; padding: 24px; }
.hidden { display: none !important; }

/* ---------- 卡片（登录/绑定） ---------- */
.auth-card {
  width: min(380px, 92vw);
  background: var(--card);
  backdrop-filter: blur(18px) saturate(1.1);
  -webkit-backdrop-filter: blur(18px) saturate(1.1);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 40px 34px;
  box-shadow: var(--shadow);
  text-align: center;
  animation: rise var(--t) var(--ease) both;
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.brand { font-size: 30px; font-weight: 600; letter-spacing: 0.12em; }
.brand-sub { color: var(--ink-soft); font-size: 13px; margin-top: 8px; letter-spacing: 0.18em; }

.seg { display: flex; gap: 4px; justify-content: center; margin: 26px 0 18px; padding: 4px; background: var(--line); border-radius: 999px; }
.seg-btn { flex: 1; border: 0; background: transparent; color: var(--ink-soft); font-family: var(--serif); font-size: 14px; padding: 9px 0; border-radius: 999px; cursor: pointer; transition: all var(--t) var(--ease); }
.seg-btn.active { background: var(--bg-2); color: var(--ink); box-shadow: 0 4px 14px -8px rgba(0,0,0,.25); }

.field { display: block; text-align: left; margin-bottom: 14px; }
.field span { display: block; font-size: 12px; color: var(--ink-soft); margin-bottom: 6px; letter-spacing: 0.1em; }
.field input, .field textarea, .field select {
  width: 100%; font-family: var(--serif); font-size: 15px; color: var(--ink);
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px;
  padding: 11px 13px; outline: none; transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(201,168,106,.15); }
.field[data-only="register"] { display: none; }
.auth-card.register .field[data-only="register"] { display: block; }

.btn-primary {
  width: 100%; margin-top: 6px; border: 0; cursor: pointer;
  font-family: var(--serif); font-size: 15px; letter-spacing: 0.16em; color: #fff;
  background: linear-gradient(135deg, var(--gold), var(--gold-soft));
  padding: 12px 0; border-radius: 12px; transition: transform var(--t) var(--ease), filter var(--t) var(--ease);
}
.btn-primary:hover { filter: brightness(1.05); transform: translateY(-1px); }
.btn-ghost {
  width: 100%; margin-top: 6px; cursor: pointer; font-family: var(--serif); font-size: 15px; letter-spacing: 0.16em;
  color: var(--ink); background: transparent; border: 1px solid var(--gold); padding: 12px 0; border-radius: 12px;
  transition: all var(--t) var(--ease);
}
.btn-ghost:hover { background: rgba(201,168,106,.1); }
.hint { color: #c98a8a; font-size: 12.5px; margin-top: 14px; min-height: 16px; letter-spacing: 0.05em; }
.divider { display: flex; align-items: center; gap: 12px; color: var(--ink-soft); font-size: 12px; margin: 18px 0; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--line); }

/* ---------- 主应用 ---------- */
#main-screen { display: flex; flex-direction: column; align-items: center; }
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px;
}
.counter { font-family: var(--sans); font-size: 13px; letter-spacing: 0.22em; color: var(--gold); font-weight: 300; }
.top-actions { display: flex; gap: 6px; }
.icon-btn {
  border: 0; background: transparent; cursor: pointer; color: var(--ink-soft);
  font-family: var(--serif); font-size: 13px; letter-spacing: 0.1em;
  padding: 6px 10px; border-radius: 10px; transition: all var(--t) var(--ease);
}
.icon-btn:hover { color: var(--ink); background: var(--line); }

/* ---------- 翻页 ---------- */
.pager { position: relative; width: min(900px, 94vw); height: 100vh; overflow: hidden; }
.page {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 80px 24px 90px; opacity: 0; transform: translateX(40px) scale(0.98);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
  pointer-events: none;
}
.page.active { opacity: 1; transform: none; pointer-events: auto; }
.page.prev { transform: translateX(-40px) scale(0.98); }

/* ---------- 树 ---------- */
.tree-wrap { position: relative; width: min(620px, 88vw); aspect-ratio: 800 / 620; }
#tree { width: 100%; height: 100%; overflow: visible; }
.tree-sway { position: absolute; inset: 0; pointer-events: none; }
.leaf-hit { cursor: pointer; }
.leaf-label {
  position: absolute; z-index: 30; max-width: 220px; padding: 10px 14px; font-size: 13px; line-height: 1.6;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; backdrop-filter: blur(10px);
  box-shadow: var(--shadow); opacity: 0; transform: translateY(6px); transition: all var(--t) var(--ease);
  pointer-events: none; color: var(--ink);
}
.leaf-label.show { opacity: 1; transform: none; }

.miss-btn {
  position: absolute; right: 6%; bottom: 4%; border: 0; background: transparent; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 8px;
  transition: transform var(--t) var(--ease);
}
.miss-text { font-family: var(--serif); font-style: italic; font-size: 17px; color: var(--ink); letter-spacing: 0.18em; }
.miss-line { width: 38px; height: 1px; background: var(--gold); border-radius: 1px; animation: breathe-line 3.2s var(--ease) infinite; }
@keyframes breathe-line { 0%,100% { opacity: 0.35; box-shadow: 0 0 0 0 rgba(201,168,106,.0); } 50% { opacity: 1; box-shadow: 0 0 10px 1px rgba(201,168,106,.5); } }
.miss-btn.cooldown .miss-line { animation-duration: 1s; }
.miss-msg {
  position: absolute; left: 50%; bottom: 16%; transform: translateX(-50%);
  font-family: var(--serif); font-size: 12.5px; letter-spacing: 0.16em; color: var(--ink-soft);
  opacity: 0; transition: opacity 0.8s var(--ease); text-align: center; line-height: 1.9;
}
.miss-msg.show { opacity: 1; }

.year-ring { width: min(620px, 88vw); margin-top: 14px; height: 2px; background: var(--line); border-radius: 2px; overflow: hidden; }
.year-ring i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--gold-soft), var(--gold)); box-shadow: 0 0 8px rgba(201,168,106,.5); transition: width 1s var(--ease); }

/* ---------- 列表页 ---------- */
.page-head { text-align: center; margin-bottom: 18px; }
.page-head h2 { font-size: 26px; font-weight: 600; letter-spacing: 0.2em; }
.page-sub { color: var(--ink-soft); font-size: 13px; margin-top: 6px; letter-spacing: 0.14em; }
.add-toggle { border: 1px dashed var(--line); background: transparent; color: var(--ink-soft); cursor: pointer; font-family: var(--serif); font-size: 14px; letter-spacing: 0.1em; padding: 10px 18px; border-radius: 12px; margin-bottom: 14px; transition: all var(--t) var(--ease); }
.add-toggle:hover { color: var(--ink); border-color: var(--gold); }
.add-form { width: min(440px, 90vw); display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; animation: rise 0.5s var(--ease) both; }
.add-form textarea { resize: vertical; font-family: var(--serif); font-size: 14px; color: var(--ink); background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: 11px 13px; outline: none; }
.add-form .row { display: flex; gap: 10px; align-items: center; }
.add-form .row select, .add-form .row input[type=date] { flex: 1; }
.add-form .chk { display: flex; align-items: center; gap: 6px; color: var(--ink-soft); font-size: 13px; white-space: nowrap; }

.leaf-list, .surprise-list, .message-list { width: min(460px, 92vw); list-style: none; display: flex; flex-direction: column; gap: 12px; overflow-y: auto; max-height: 52vh; padding: 4px; }
.leaf-card, .surprise-card, .message-card {
  position: relative; background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 16px 18px; backdrop-filter: blur(12px); box-shadow: var(--shadow);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), opacity var(--t) var(--ease);
  animation: rise 0.5s var(--ease) both;
}
.leaf-card:hover, .surprise-card:hover, .message-card:hover { transform: translateY(-2px); }
.leaf-card.fulfilled { border-color: var(--gold); box-shadow: 0 0 22px -6px rgba(201,168,106,.5); }
.leaf-card .who, .message-card .who { font-size: 11px; color: var(--gold); letter-spacing: 0.16em; }
.leaf-card .content, .message-card .content { font-size: 15px; line-height: 1.7; margin: 6px 0 10px; }
.leaf-card .meta, .message-card .meta { font-size: 11.5px; color: var(--ink-soft); display: flex; justify-content: space-between; align-items: center; }
.badge { font-size: 11px; padding: 2px 9px; border-radius: 999px; background: var(--line); color: var(--ink-soft); }
.badge.fulfilled { background: rgba(201,168,106,.18); color: var(--gold); }
.card-actions { display: flex; gap: 8px; margin-top: 12px; opacity: 0; max-height: 0; overflow: hidden; transition: all var(--t) var(--ease); }
.leaf-card:hover .card-actions, .surprise-card:hover .card-actions, .message-card:hover .card-actions { opacity: 1; max-height: 40px; }
.card-actions button { border: 1px solid var(--line); background: transparent; color: var(--ink-soft); font-family: var(--serif); font-size: 12px; padding: 6px 12px; border-radius: 10px; cursor: pointer; transition: all var(--t) var(--ease); }
.card-actions button:hover { color: var(--ink); border-color: var(--gold); }

.surprise-card .title { font-size: 15px; letter-spacing: 0.06em; }
.surprise-card .title.secret { letter-spacing: 0.3em; color: var(--gold); }
.surprise-card .plan { font-size: 13px; color: var(--ink-soft); line-height: 1.6; margin: 6px 0; }
.surprise-card .meta { font-size: 11.5px; color: var(--ink-soft); display: flex; justify-content: space-between; }
.surprise-progress { font-size: 11px; padding: 2px 9px; border-radius: 999px; background: var(--line); color: var(--ink-soft); }
.surprise-card.delivered { border-color: var(--gold); box-shadow: 0 0 22px -6px rgba(201,168,106,.5); }

/* ---------- 翻页导航 ---------- */
.pager-nav { position: fixed; bottom: 22px; left: 0; right: 0; z-index: 20; display: flex; align-items: center; justify-content: center; gap: 18px; }
.nav-arrow { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 20px; cursor: pointer; backdrop-filter: blur(10px); transition: all var(--t) var(--ease); }
.nav-arrow:hover { border-color: var(--gold); color: var(--gold); }
.dots { display: flex; gap: 9px; }
.dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--line); transition: all var(--t) var(--ease); cursor: pointer; }
.dots i.active { background: var(--gold); width: 20px; border-radius: 4px; }

/* ---------- 想念日历覆盖层 ---------- */
.overlay { position: fixed; inset: 0; z-index: 40; display: flex; align-items: center; justify-content: center; padding: 20px; background: rgba(20, 28, 38, 0.32); backdrop-filter: blur(6px); animation: fade 0.4s var(--ease) both; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.calendar-card { width: min(420px, 94vw); background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 26px 24px; backdrop-filter: blur(20px); box-shadow: var(--shadow); animation: rise 0.5s var(--ease) both; }
.cal-head { display: flex; align-items: center; justify-content: space-between; font-family: var(--sans); letter-spacing: 0.18em; color: var(--ink); font-size: 15px; }
.cal-view { display: flex; gap: 6px; justify-content: center; margin: 16px 0 10px; }
.view-btn { border: 1px solid var(--line); background: transparent; color: var(--ink-soft); font-family: var(--serif); font-size: 12.5px; padding: 5px 14px; border-radius: 999px; cursor: pointer; transition: all var(--t) var(--ease); }
.view-btn.active { color: var(--gold); border-color: var(--gold); }
.cal-stat { text-align: center; font-family: var(--sans); font-size: 12px; color: var(--gold); letter-spacing: 0.16em; margin-bottom: 16px; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.cal-cell { position: relative; aspect-ratio: 1; display: flex; align-items: center; justify-content: center; }
.cal-cell.empty { visibility: hidden; }
.cal-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ink-soft); opacity: 0.12; transition: all var(--t) var(--ease); cursor: pointer; }
.cal-dot.lv1 { opacity: 0.45; box-shadow: 0 0 6px rgba(201,168,106,.4); }
.cal-dot.lv2 { opacity: 0.7; width: 11px; height: 11px; background: var(--gold-soft); box-shadow: 0 0 9px rgba(201,168,106,.55); }
.cal-dot.lv3 { opacity: 0.9; width: 13px; height: 13px; background: var(--gold); box-shadow: 0 0 12px rgba(201,168,106,.7); }
.cal-dot.lv4 { opacity: 1; width: 15px; height: 15px; background: var(--gold); box-shadow: 0 0 16px rgba(201,168,106,.85); }
.cal-dot:hover { transform: scale(1.4); opacity: 1; }
.cal-tip { position: absolute; bottom: 120%; left: 50%; transform: translateX(-50%); white-space: nowrap; font-size: 11px; color: var(--ink-soft); background: var(--bg-2); padding: 3px 8px; border-radius: 8px; opacity: 0; transition: opacity var(--t) var(--ease); pointer-events: none; }
.cal-cell:hover .cal-tip { opacity: 1; }
.cal-detail { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--ink-soft); line-height: 1.9; }
.cal-detail .bars { display: flex; gap: 3px; margin-top: 8px; align-items: flex-end; height: 36px; }
.cal-detail .bars i { flex: 1; background: var(--gold-soft); border-radius: 2px 2px 0 0; opacity: 0.7; min-height: 3px; }
.cal-close { display: block; margin: 18px auto 0; border: 0; background: transparent; color: var(--ink-soft); font-family: var(--serif); font-size: 13px; letter-spacing: 0.16em; cursor: pointer; transition: color var(--t) var(--ease); }
.cal-close:hover { color: var(--gold); }
.cal-empty { text-align: center; color: var(--ink-soft); font-size: 13px; padding: 40px 0; letter-spacing: 0.1em; }

/* ---------- Toast ---------- */
.toast { position: fixed; left: 50%; bottom: 80px; transform: translateX(-50%) translateY(10px); z-index: 60; background: var(--card); border: 1px solid var(--line); color: var(--ink); font-size: 13px; padding: 10px 18px; border-radius: 12px; backdrop-filter: blur(12px); box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: all 0.5s var(--ease); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .topbar { padding: 14px 16px; }
  .page { padding: 70px 16px 84px; }
  .tree-wrap { width: 92vw; }
  .miss-btn { right: auto; left: 50%; bottom: 2%; transform: translateX(-50%); }
  .leaf-list, .surprise-list, .message-list { max-height: 50vh; }
}

/* ---------- 无障碍：尊重 prefers-reduced-motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .aurora { animation: none; }
}