diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 0a00843..3246ce9 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -771,9 +771,11 @@ onMounted(bootstrap)
           <header><div><small>NEW TASK</small><h2 id="task-compose-title">{{ taskComposeTitle }}</h2></div><button class="icon" type="button" aria-label="关闭添加任务" @click="closeTaskCompose"><X/></button></header>
           <label>任务名称<input v-model="composeTitle" class="task-compose-input" placeholder="准备做点什么？" autocomplete="off"></label>
           <div class="task-compose-row"><label>清单<select v-model="composeListId"><option v-for="list in lists" :key="list.id" :value="list.id">{{list.name}}</option></select></label><label>优先级<select v-model.number="composePriority"><option :value="0">无</option><option :value="1">低</option><option :value="2">中</option><option :value="3">高</option></select></label></div>
-          <label>截止日期<input v-model="composeDueAt" type="date"></label>
-          <label class="time-toggle"><input v-model="composeHasTime" type="checkbox"> 添加时间</label>
-          <label v-if="composeHasTime">时间<input v-model="composeTime" type="time"></label>
+          <div class="task-compose-due-row">
+            <label>截止日期<input v-model="composeDueAt" type="date"></label>
+            <button v-if="!composeHasTime" class="task-compose-time-add" type="button" @click="composeHasTime=true">添加时间</button>
+            <label v-else class="task-compose-time-field">时间<span><input v-model="composeTime" type="time"><button class="task-compose-time-remove" type="button" aria-label="移除时间" @click="composeHasTime=false"><X/></button></span></label>
+          </div>
           <label>重复<select v-model="composeRepeat" :disabled="!composeDueAt"><option value="none">不重复</option><option value="daily">每天</option><option value="weekly">每周</option><option value="monthly">每月</option><option value="yearly">每年</option><option value="custom">自定义…</option></select><small v-if="!composeDueAt" class="field-hint">设置截止时间后可重复</small></label>
           <section v-if="composeRepeat==='custom'" class="repeat-custom-fields"><div><span>每隔</span><input v-model.number="composeRepeatConfig.interval" type="number" min="1"><select v-model="composeRepeatConfig.frequency"><option value="daily">天</option><option value="weekly">周</option><option value="monthly">月</option><option value="yearly">年</option></select></div><label v-if="composeRepeatConfig.frequency==='weekly'">重复日期<span class="weekday-picker"><label v-for="day in weekdayOptions" :key="day.value"><input v-model="composeRepeatConfig.weekdays" type="checkbox" :value="day.value">{{day.label}}</label></span></label><label v-if="composeRepeatConfig.frequency==='monthly'">每月日期<input v-model.number="composeRepeatConfig.monthDays![0]" type="number" min="1" max="31"></label><label>结束方式<select v-model="composeRepeatConfig.endMode"><option value="never">永不结束</option><option value="date">指定日期</option><option value="count">重复次数</option></select></label><label v-if="composeRepeatConfig.endMode==='date'">结束日期<input v-model="composeRepeatConfig.until" type="date"></label><label v-if="composeRepeatConfig.endMode==='count'">重复次数<input v-model.number="composeRepeatConfig.count" type="number" min="1"></label></section>
           <label>备注<textarea v-model="composeDescription" rows="3" placeholder="可选，支持 Markdown"/></label>
diff --git a/frontend/src/style.css b/frontend/src/style.css
index 71b86a1..9bc833e 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -28,6 +28,6 @@ main{min-width:0;padding:27px 34px 50px;overflow:auto;background:linear-gradient
 .empty-panel{text-align:center;color:var(--muted);display:grid;place-items:center;gap:10px}.today-empty-panel{min-height:130px}.empty-action{margin-top:4px;color:#655d52}.empty-action svg{width:15px;height:15px}
 .settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.tool-card{display:flex;flex-direction:column;align-items:flex-start;gap:10px}.tool-card>svg{color:var(--accent);width:25px;height:25px}.tool-card p{margin:0;color:var(--muted);font-size:13px}.tool-card.wide{grid-column:1/-1}.password-form{width:100%;display:grid;gap:10px}.password-form label{display:grid;gap:6px;color:#675f54;font-size:12px;font-weight:650}.password-form input{width:100%;border:1px solid var(--line);background:#fff;border-radius:10px;padding:11px 12px;outline:none}.password-form input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(241,90,41,.1)}.password-form button{justify-self:start}.file-button input{display:none}.tool-card pre{width:100%;max-height:180px;overflow:auto;background:#f8f3e8;padding:10px;border-radius:8px;font-size:10px}.session-row,.audit-row{width:100%;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding:9px 0}.session-row span{display:grid}.session-row small,.audit-row small{color:var(--muted);font-size:11px}.inline-error{padding:9px;border-radius:8px;color:var(--danger);background:#fff0ed}.settings.active{background:var(--accent-soft);color:#b7421e;font-weight:700}
 @media(max-width:800px){.settings-grid{grid-template-columns:1fr}.tool-card.wide{grid-column:auto}.habit-row{padding:5px 4px 5px 8px}.habit-main{padding:10px 2px}.numeric-action input{width:62px}}
-.unified-fab{display:grid;place-items:center;position:fixed;z-index:60;right:20px;bottom:22px;width:56px;height:56px;border:0;border-radius:50%;background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(241,90,41,.28);transition:transform .16s ease,box-shadow .16s ease;touch-action:none;user-select:none}.unified-fab svg{width:25px;height:25px}.unified-fab:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(241,90,41,.32)}.unified-fab:active{transform:scale(.96)}.unified-fab.dragging{transform:scale(1.06);box-shadow:0 12px 28px rgba(241,90,41,.36)}.task-compose-mask{position:fixed;z-index:70;inset:0;background:rgba(45,38,31,.34);display:flex;align-items:flex-end;padding:0}.task-compose-sheet{width:100%;max-height:min(88dvh,720px);overflow:auto;background:#fffdf8;border-radius:24px 24px 0 0;padding:18px 18px calc(20px + env(safe-area-inset-bottom));box-shadow:0 -16px 42px rgba(56,40,24,.2);display:grid;gap:14px;transform-origin:var(--fab-origin-x,calc(100% - 44px)) var(--fab-origin-y,100%)}.task-compose-sheet header{display:flex;align-items:center;justify-content:space-between}.task-compose-sheet header small{color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.12em}.task-compose-sheet h2{margin:2px 0 0;font-size:22px}.task-compose-sheet label{display:grid;gap:6px;color:#675f54;font-size:12px;font-weight:650}.task-compose-sheet input,.task-compose-sheet select,.task-compose-sheet textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:11px;padding:12px;outline:none;resize:vertical}.task-compose-sheet input:focus,.task-compose-sheet select:focus,.task-compose-sheet textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(241,90,41,.1)}.task-compose-row{display:grid;grid-template-columns:minmax(0,1fr) 105px;gap:10px}.task-compose-sheet footer{display:flex;justify-content:flex-end;gap:9px;padding-top:4px}.task-compose-sheet button:disabled{opacity:.45}.task-compose-enter-active,.task-compose-leave-active{transition:background .22s ease}.task-compose-enter-active .task-compose-sheet,.task-compose-leave-active .task-compose-sheet{transition:transform .28s cubic-bezier(.2,.9,.25,1.08),opacity .2s ease}.task-compose-enter-from,.task-compose-leave-to{background:rgba(45,38,31,0)}.task-compose-enter-from .task-compose-sheet,.task-compose-leave-to .task-compose-sheet{transform:translateY(36px) scale(.86);opacity:0}
+.unified-fab{display:grid;place-items:center;position:fixed;z-index:60;right:20px;bottom:22px;width:56px;height:56px;border:0;border-radius:50%;background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(241,90,41,.28);transition:transform .16s ease,box-shadow .16s ease;touch-action:none;user-select:none}.unified-fab svg{width:25px;height:25px}.unified-fab:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(241,90,41,.32)}.unified-fab:active{transform:scale(.96)}.unified-fab.dragging{transform:scale(1.06);box-shadow:0 12px 28px rgba(241,90,41,.36)}.task-compose-mask{position:fixed;z-index:70;inset:0;background:rgba(45,38,31,.34);display:flex;align-items:flex-end;padding:0}.task-compose-sheet{width:100%;max-height:min(88dvh,720px);overflow:auto;background:#fffdf8;border-radius:24px 24px 0 0;padding:18px 18px calc(20px + env(safe-area-inset-bottom));box-shadow:0 -16px 42px rgba(56,40,24,.2);display:grid;gap:14px;transform-origin:var(--fab-origin-x,calc(100% - 44px)) var(--fab-origin-y,100%)}.task-compose-sheet header{display:flex;align-items:center;justify-content:space-between}.task-compose-sheet header small{color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.12em}.task-compose-sheet h2{margin:2px 0 0;font-size:22px}.task-compose-sheet label{display:grid;gap:6px;color:#675f54;font-size:12px;font-weight:650}.task-compose-sheet input,.task-compose-sheet select,.task-compose-sheet textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:11px;padding:12px;outline:none;resize:vertical}.task-compose-sheet input:focus,.task-compose-sheet select:focus,.task-compose-sheet textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(241,90,41,.1)}.task-compose-row{display:grid;grid-template-columns:minmax(0,1fr) 105px;gap:10px}.task-compose-due-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:end}.task-compose-time-add{min-width:96px;height:43px;border:1px solid var(--line);border-radius:11px;background:#fffaf3;color:var(--accent);font-weight:700}.task-compose-time-add:hover{border-color:var(--accent);background:#fff4e8}.task-compose-time-field{min-width:138px}.task-compose-time-field>span{display:flex;align-items:center;gap:4px}.task-compose-time-field input{min-width:0}.task-compose-time-remove{display:grid;place-items:center;flex:0 0 43px;width:43px;height:43px;border:0;border-radius:10px;background:transparent;color:var(--muted)}.task-compose-time-remove:hover{background:#f5eee5;color:var(--text)}.task-compose-time-remove svg{width:17px;height:17px}.task-compose-sheet footer{display:flex;justify-content:flex-end;gap:9px;padding-top:4px}.task-compose-sheet button:disabled{opacity:.45}.task-compose-enter-active,.task-compose-leave-active{transition:background .22s ease}.task-compose-enter-active .task-compose-sheet,.task-compose-leave-active .task-compose-sheet{transition:transform .28s cubic-bezier(.2,.9,.25,1.08),opacity .2s ease}.task-compose-enter-from,.task-compose-leave-to{background:rgba(45,38,31,0)}.task-compose-enter-from .task-compose-sheet,.task-compose-leave-to .task-compose-sheet{transform:translateY(36px) scale(.86);opacity:0}
 .countdown-compose-enter-active,.countdown-compose-leave-active{transition:background .24s ease}.countdown-compose-enter-active .countdown-modal,.countdown-compose-leave-active .countdown-modal{transition:transform .34s cubic-bezier(.18,.9,.28,1.16),opacity .22s ease,filter .22s ease;transform-origin:var(--fab-origin-x,calc(100% - 43px)) var(--fab-origin-y,calc(100% - 104px))}.countdown-compose-enter-from,.countdown-compose-leave-to{background:rgba(45,38,31,0)}.countdown-compose-enter-from .countdown-modal,.countdown-compose-leave-to .countdown-modal{transform:translate(20px,28px) scale(.18) rotate(8deg);opacity:0;filter:blur(5px)}@media(max-width:930px){.unified-fab{bottom:calc(82px + env(safe-area-inset-bottom))}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}
 .overdue-section{margin-top:18px}.overdue-heading{color:var(--danger);margin-bottom:6px}.overdue-heading span{min-width:22px;height:22px;padding:0 7px;display:inline-grid;place-items:center;border-radius:999px;background:#fde2dc;color:var(--danger);font-size:11px}.overdue-list{margin-bottom:18px}.overdue-task{background:#fff8f6}.overdue-task .meta,.overdue-badge{color:var(--danger)}.overdue-badge{font-size:11px;font-weight:700;background:#fde2dc;border-radius:999px;padding:4px 8px}.pager{display:flex;align-items:center;justify-content:flex-end;gap:10px;margin:0 0 14px}.pager button:disabled{opacity:.4;cursor:not-allowed}.pager span{color:var(--muted);font-size:13px}.section-heading{display:flex;align-items:center;gap:7px;margin:16px 0 10px;font-size:16px;line-height:1.35;color:#514a40}.section-heading svg{width:17px;height:17px;color:var(--accent)}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.more-settings{border:1px solid var(--line);border-radius:10px;background:#fff}.more-settings summary{cursor:pointer;padding:11px 13px;color:#756d61;font-size:12px;font-weight:700}.more-settings-body{display:grid;gap:12px;padding:0 13px 13px}.more-settings-body>label{display:grid;grid-template-columns:80px 1fr;align-items:center;gap:7px;color:#756d61;font-size:12px;font-weight:650}.modal-mask{position:fixed;inset:0;z-index:80;background:rgba(45,38,31,.4);display:grid;place-items:center;padding:24px}.modal-box{width:min(360px,92vw);background:#fffdf8;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:22px;display:grid;gap:14px}.modal-box h3{margin:0;font-size:17px}.modal-box label{display:grid;gap:7px;font-size:12px;font-weight:650;color:#756d61}.modal-input{width:100%;border:1px solid var(--line);background:#fff;padding:11px;border-radius:9px;outline:none;font-size:16px}.modal-actions{display:flex;justify-content:flex-end;gap:8px}.countdown-view{display:grid;gap:16px;padding-bottom:36px}.countdown-content{display:grid;gap:16px}.countdown-hero{display:flex;align-items:end;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:10px}.countdown-hero small{display:block;color:var(--muted);font-size:12px}.countdown-layout{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(220px,.8fr);gap:16px;align-items:start}.countdown-timeline{display:grid;gap:18px}.countdown-group{display:grid;gap:7px}.countdown-group>h3{margin:0 0 2px;padding-left:4px;color:#786f63;font-size:12px;font-weight:750}.countdown-row{position:relative;width:100%;min-height:78px;display:grid;grid-template-columns:42px minmax(0,1fr) 86px;align-items:center;gap:11px;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;padding:10px 8px;text-align:left;color:inherit;transition:background .15s ease,transform .15s ease}.countdown-row:first-of-type{border-top:1px solid var(--line)}.countdown-row:hover{background:#fffaf3}.countdown-row:active{transform:scale(.995)}.countdown-row.pinned{background:#fff8f1}.countdown-row.today{background:#f5f8f1}.countdown-row.past{opacity:.7}.countdown-row .pinned-icon{position:absolute;right:4px;top:5px}.countdown-icon{width:38px;height:38px;border-radius:12px;background:#fff2e8;display:grid;place-items:center;font-size:19px}.countdown-main{min-width:0;display:grid;gap:4px}.countdown-main>b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:15px;color:#3f3932}.countdown-main>small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted);font-size:11px}.countdown-badges{display:flex;gap:5px}.countdown-badges em{font-style:normal;color:#8a7f72;font-size:10px}.countdown-badges em+em:before{content:'·';margin-right:5px;color:#c1b7aa}.countdown-state{display:grid;justify-items:end;gap:3px}.countdown-state strong{font-variant-numeric:tabular-nums;font-size:28px;line-height:1;color:var(--accent)}.countdown-state small{color:var(--muted);font-size:10px}.countdown-row.today .countdown-state strong,.countdown-row.today .countdown-state small{color:#71856b}.countdown-row.past .countdown-state strong{color:#887d70}.countdown-focus{position:sticky;top:18px;display:grid;justify-items:start;gap:8px;border:1px solid var(--line);border-radius:16px;background:#fffdf8;padding:18px;box-shadow:0 6px 20px rgba(81,61,38,.06)}.countdown-focus>small{color:var(--muted);font-size:11px}.countdown-focus>span{font-size:27px}.countdown-focus h3{margin:0;font-size:18px}.countdown-focus p{margin:0;color:var(--muted);font-size:12px}.countdown-number{display:flex;align-items:end;gap:4px;margin-top:8px}.countdown-number strong{font-variant-numeric:tabular-nums;font-size:44px;line-height:1;font-weight:750;color:#3f3932}.countdown-number span{font-size:13px;color:#7a7165}.countdown-copy{font-size:13px;color:var(--accent)}.countdown-empty{min-height:260px;background:#fffdf8;border:1px dashed var(--line);border-radius:16px;padding:26px;color:#766d60;text-align:center;display:grid;gap:9px;place-content:center;justify-items:center}.countdown-empty svg{color:var(--accent);width:30px;height:30px}.countdown-empty span{font-size:12px}.countdown-empty button{margin-top:5px}.archived-toggle,.archived-countdowns button{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 11px;font-size:12px}.archived-toggle{justify-self:start}.archived-countdowns{display:grid;gap:10px}.archived-countdowns article{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px}.archived-countdowns article b{flex:1}.archived-countdowns article small{color:var(--muted)}.countdown-detail-mask,.countdown-modal-mask{position:fixed;inset:0;background:rgba(45,38,31,.36);display:grid;padding:20px}.countdown-detail-mask{z-index:85;place-items:end center}.countdown-detail-sheet{width:min(500px,100%);background:#fffdf8;border:1px solid var(--line);border-radius:20px;box-shadow:0 12px 36px rgba(56,40,24,.18);padding:18px;display:grid;gap:16px}.countdown-detail-sheet header{display:grid;grid-template-columns:42px 1fr 44px;align-items:center;gap:10px}.countdown-detail-sheet header small{color:var(--muted);font-size:11px}.countdown-detail-sheet header h3{margin:2px 0 0;font-size:19px}.countdown-detail-sheet header button{min-width:44px;min-height:44px;border:0;background:transparent;color:#766d60;border-radius:8px;width:44px;height:44px;display:grid;place-items:center}.countdown-modal header button{min-width:44px;min-height:44px;border:0;background:transparent;color:#766d60;border-radius:8px;width:44px;height:44px;display:grid;place-items:center}.countdown-detail-days{display:flex;align-items:baseline;gap:6px;padding:8px 0}.countdown-detail-days strong{font-variant-numeric:tabular-nums;font-size:46px;line-height:1}.countdown-detail-days span{color:var(--muted)}.countdown-detail-days b{margin-left:auto;color:var(--accent);font-size:13px}.countdown-detail-sheet dl{margin:0;display:grid;gap:1px;background:var(--line)}.countdown-detail-sheet dl div{display:grid;grid-template-columns:62px 1fr;gap:10px;background:#fffdf8;padding:10px 0}.countdown-detail-sheet dt{color:var(--muted);font-size:12px}.countdown-detail-sheet dd{margin:0;font-size:13px}.countdown-detail-sheet footer{display:flex;justify-content:flex-end;gap:8px}.countdown-detail-sheet footer button{min-height:44px;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 13px}.countdown-modal-mask{z-index:90;place-items:center}.countdown-modal{width:min(420px,96vw);background:#fffdf8;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:18px;display:grid;gap:12px}.countdown-modal header{display:flex;justify-content:space-between;align-items:start}.countdown-modal header small{color:var(--muted)}.countdown-modal header h3{margin:2px 0 0}.countdown-modal label{display:grid;gap:6px;color:#675f54;font-size:12px;font-weight:650}.countdown-modal input,.countdown-modal select{border:1px solid var(--line);background:#fff;border-radius:10px;padding:11px 12px;outline:none}.countdown-modal input:focus,.countdown-modal select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(241,90,41,.1)}.countdown-title-fields{display:grid;grid-template-columns:72px 1fr;gap:8px}.countdown-modal footer{display:flex;justify-content:flex-end;gap:8px;padding-top:6px}.countdown-advanced{border:1px solid var(--line);border-radius:11px;background:#fffaf4}.countdown-advanced summary{min-height:44px;display:flex;align-items:center;justify-content:space-between;padding:0 12px;cursor:pointer;color:#756d61;font-size:12px;font-weight:700;list-style:none}.countdown-advanced summary::-webkit-details-marker{display:none}.countdown-advanced summary svg{width:16px;height:16px;transition:transform .16s ease}.countdown-advanced[open] summary svg{transform:rotate(180deg)}.countdown-advanced>label,.countdown-advanced>.countdown-title-fields{margin:0 12px 12px}.countdown-detail-enter-active,.countdown-detail-leave-active{transition:background .2s ease}.countdown-detail-enter-active .countdown-detail-sheet,.countdown-detail-leave-active .countdown-detail-sheet{transition:transform .24s ease,opacity .2s ease}.countdown-detail-enter-from .countdown-detail-sheet,.countdown-detail-leave-to .countdown-detail-sheet{transform:translateY(100%);opacity:.6}@media(max-width:930px){.countdown-layout{grid-template-columns:1fr}.countdown-focus{display:none}}@media(max-width:800px){.countdown-hero{align-items:center}.countdown-hero h2{font-size:19px}.countdown-row{grid-template-columns:40px minmax(0,1fr) 76px;padding:9px 4px;gap:9px}.countdown-state strong{font-size:25px}.countdown-detail-mask,.countdown-modal-mask{place-items:end;padding:0}.countdown-detail-sheet,.countdown-modal{width:100%;border-radius:22px 22px 0 0;padding:18px 16px calc(18px + env(safe-area-inset-bottom));max-height:min(88dvh,760px);overflow:auto}.countdown-view{position:relative}}
diff --git a/frontend/src/style.test.ts b/frontend/src/style.test.ts
index 5040589..1f05ab0 100644
--- a/frontend/src/style.test.ts
+++ b/frontend/src/style.test.ts
@@ -186,7 +186,12 @@ describe('unified floating add interaction', () => {
   it('defaults every new-task composer to today', () => {
     expect(app).toContain('composeDueAt.value = defaultTaskDueAt()')
     expect(app).toContain('v-model="composeDueAt" type="date"')
-    expect(app).toContain('v-model="composeHasTime" type="checkbox"')
+    expect(app).not.toContain('class="time-toggle"')
+    expect(app).not.toContain('v-model="composeHasTime" type="checkbox"')
+    expect(app).toContain('class="task-compose-due-row"')
+    expect(app).toContain('class="task-compose-time-add"')
+    expect(app).toContain('class="task-compose-time-remove"')
+    expect(css).toContain('.task-compose-due-row{display:grid;grid-template-columns:minmax(0,1fr) auto;')
     expect(app).toContain("composeHasTime.value ? composeTime.value : '23:59'")
   })