:root {
  color-scheme: light;
  --paper: #fbfbfb;
  --panel: #fff;
  --ink: #111;
  --muted: rgba(17, 17, 17, .56);
  --faint: rgba(17, 17, 17, .16);
  --rule: rgba(17, 17, 17, .24);
  --theme: #555555;
  --scroll-thumb: rgba(17, 17, 17, .28);
  --scroll-thumb-hover: rgba(17, 17, 17, .42);
  --focus-bg: rgba(17, 17, 17, .035);
  --focus-bg-strong: rgba(17, 17, 17, .055);
  --serif: Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-in: cubic-bezier(.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(.65, 0, .35, 1);
  --dur-press: 140ms;
  --dur-state: 220ms;
  --dur-enter: 260ms;
  --dur-switch: 220ms;
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
  -webkit-tap-highlight-color: rgba(53, 174, 226, .18);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  background-color: var(--paper);
  background-image: 
    linear-gradient(rgba(17, 17, 17, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 17, 17, 0.05) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: -1px -1px;
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-synthesis: none;
}

::selection {
  background: color-mix(in srgb, var(--theme) 22%, transparent);
  color: var(--ink);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  min-width: 14px;
  min-height: 20px;
  touch-action: manipulation;
}

input,
select,
textarea {
  min-width: 0;
}

input,
textarea {
  caret-color: var(--theme);
}

[hidden] {
  display: none !important;
}

:where(a, button, input, select, textarea):focus {
  outline: none;
}

body.keyboard-navigation :where(a, button, input, select, textarea):focus {
  outline: 2px solid var(--theme);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: calc(12px + env(safe-area-inset-top));
  left: calc(12px + env(safe-area-inset-left));
  padding: 8px 10px;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--theme);
  font-family: var(--mono);
  font-size: 12px;
  transform: translateY(-160%);
}

body.keyboard-navigation .skip-link:focus {
  transform: translateY(0);
}

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: 
    linear-gradient(rgba(17, 17, 17, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 17, 17, 0.15) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: -1px -1px;
  mask-image: radial-gradient(280px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px), black 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(280px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px), black 0%, transparent 100%);
}

.workspace {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(360px, 720px) minmax(360px, 720px);
  justify-content: center;
  align-items: center;
  gap: clamp(28px, 4vw, 64px);
  min-height: 100vh;
  padding: max(clamp(44px, 7vw, 84px), env(safe-area-inset-top))
    max(clamp(44px, 7vw, 84px), env(safe-area-inset-right))
    max(clamp(44px, 7vw, 84px), env(safe-area-inset-bottom))
    max(clamp(44px, 7vw, 84px), env(safe-area-inset-left));
}

.eyebrow,
.shell-heading p,
.paper-tabs,
.task-meta,
.task-add-form input,
.subtask-list,
.settings-kicker,
.settings-actions,
.settings-note,
.dialog-actions {
  font-family: var(--mono);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .02em;
  text-transform: uppercase;
}


.task-shell {
  width: 100%;
  max-width: 720px;
}

.day-flow {
  align-self: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  height: min(70vh, 760px);
  min-height: 480px;
  padding: clamp(26px, 3.2vw, 44px);
  background: color-mix(in srgb, var(--panel) 78%, transparent);
  border: 1px solid var(--rule);
  box-shadow: 0 1px 8px rgba(17, 17, 17, .035);
}

.day-flow-header {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.day-flow .eyebrow {
  margin: 0;
}

.day-flow-time {
  display: block;
  color: var(--ink);
  font-family: var(--mono);
  font-size: clamp(42px, 5vw, 72px);
  font-variant-numeric: tabular-nums;
  line-height: .92;
}

.day-flow-grid {
  display: grid;
  grid-template-columns: repeat(45, minmax(0, 1fr));
  gap: clamp(2px, .22vw, 3px);
}

.day-flow-cell {
  aspect-ratio: 1;
  min-width: 0;
  border: 1px solid color-mix(in srgb, var(--ink) 10%, transparent);
  background: color-mix(in srgb, var(--ink) 4%, var(--panel));
}

.day-flow-cell.is-complete {
  border-color: color-mix(in srgb, var(--ink) 18%, transparent);
  background: color-mix(in srgb, var(--ink) 42%, var(--panel));
}

.day-flow-cell.is-current {
  border-color: var(--ink);
  box-shadow: 0 0 0 1px var(--ink);
}

.day-flow-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

/* 文件夹式标签：位于纸张堆叠外部上方，水平位置固定，激活标签与最前纸张相连 */
.paper-tabs {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 6px;
  padding-left: 16px;
  margin-bottom: -1px;
  font-size: 12px;
}

.paper-tabs button {
  position: relative;
  z-index: 1;
  padding: 9px 18px;
  color: color-mix(in srgb, var(--ink) 34%, transparent);
  background: color-mix(in srgb, var(--paper) 72%, var(--panel));
  border: 1px solid var(--rule);
  border-bottom: 0;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  transform: translateY(3px);
  transition: color var(--dur-press) var(--ease-out),
    background var(--dur-press) var(--ease-out),
    transform var(--dur-state) var(--ease-out);
}

/* 激活标签：上浮、加粗，并盖住最前纸张顶边，形成连续表面 */
.paper-tabs button.is-active {
  z-index: 6;
  color: var(--ink);
  background: var(--panel);
  font-weight: 700;
  transform: translateY(0);
}

.paper-tabs button.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--panel);
}

.paper-tabs button:not(.is-active):hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 40%, var(--panel));
  transform: translateY(1px);
}

.paper-tabs button:active {
  transform: translateY(1px) scale(.97);
}

/* 纸张堆叠：三层拟物化纸张，前置内容浮于最上层，背后两层露出右下边缘 */
.paper-stack {
  --stack-shift-x: 8px;
  --stack-shift-y: 9px;
  position: relative;
  height: min(70vh, 760px);
  min-height: 480px;
  margin-top: -1px;
}

.paper {
  position: absolute;
  inset: 0;
  background: var(--panel);
  border: 1px solid var(--rule);
  z-index: calc(3 - var(--slot, 0));
  box-shadow: 0 1px 3px rgba(17, 17, 17, .04);
  transform: translate(
    calc(var(--slot, 0) * var(--stack-shift-x)),
    calc(var(--slot, 0) * var(--stack-shift-y))
  );
  transition: box-shadow var(--dur-state) var(--ease-in-out);
}

/* 前置内容层：始终覆盖在最前纸张（slot 0）之上，承载表单与任务列表 */
.paper-content {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--rule);
  box-shadow: 0 2px 12px rgba(17, 17, 17, .05);
}

.task-check,
.subtask-check,
.settings-button,
.dialog-actions button {
  border: 0;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: color var(--dur-press) var(--ease-out),
    transform var(--dur-press) var(--ease-out);
}

.task-check:active,
.subtask-check:active,
.due-button:active,
.settings-button:active,
.dialog-actions button:active {
  transform: scale(.94);
}

.subtask-check:hover {
  color: var(--ink);
}

.task-list {
  flex: 1 1 auto;
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 0;
  overflow-y: auto;
  scrollbar-gutter: stable;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
  padding: 16px 20px 20px;
  overscroll-behavior: contain;
}

.settings-panel {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 34px 40px;
}

.settings-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  max-width: 620px;
  padding: 2px 0 28px;
  border-bottom: 1px dashed var(--rule);
}

.settings-section:last-child {
  border-bottom: 0;
}

.settings-kicker {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .02em;
}

.settings-section h2 {
  margin: 0 0 14px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
}

.settings-section p {
  margin: 0;
  max-width: 52ch;
  color: color-mix(in srgb, var(--ink) 66%, transparent);
  font-size: 13px;
  line-height: 1.6;
  text-wrap: pretty;
}

.settings-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  font-size: 12px;
}

.settings-button {
  display: inline-grid;
  place-items: center;
  min-width: 104px;
  min-height: 30px;
  padding: 0 12px;
  border: 1px solid color-mix(in srgb, var(--ink) 48%, transparent);
  border-radius: 4px;
  color: var(--ink);
  background: color-mix(in srgb, var(--panel) 78%, transparent);
  box-shadow:
    inset 1px 1px 0 2px rgba(255, 255, 255, .74),
    inset -1px -1px 0 2px rgba(17, 17, 17, .08);
  font-size: 12px;
  line-height: 16px;
  text-transform: uppercase;
  transition: border-color var(--dur-press) var(--ease-out),
    background var(--dur-press) var(--ease-out),
    box-shadow var(--dur-press) var(--ease-out),
    transform var(--dur-press) var(--ease-out);
}

.settings-button:hover {
  border-color: color-mix(in srgb, var(--ink) 70%, transparent);
  color: var(--ink);
  background: var(--panel);
  box-shadow:
    inset 1px 1px 0 2px rgba(255, 255, 255, .9),
    inset -1px -1px 0 2px rgba(17, 17, 17, .11),
    0 1px 0 rgba(17, 17, 17, .12);
  transform: translateY(-1px);
}

.settings-button:active {
  transform: translateY(1px) scale(.98);
  box-shadow:
    inset -1px -1px 0 2px rgba(255, 255, 255, .72),
    inset 1px 1px 0 2px rgba(17, 17, 17, .1);
}

.settings-note {
  min-height: 26px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

.task-list::-webkit-scrollbar {
  width: 12px;
}

.task-list::-webkit-scrollbar-track {
  background: transparent;
}

.task-list::-webkit-scrollbar-thumb {
  min-height: 44px;
  border: 3px solid var(--panel);
  border-radius: 8px;
  background-color: var(--scroll-thumb);
  background-clip: content-box;
}

.task-list::-webkit-scrollbar-thumb:hover {
  background-color: var(--scroll-thumb-hover);
}

.task-list::-webkit-scrollbar-button {
  display: none;
  width: 0;
  height: 0;
  border: 0;
  color: transparent;
  background: transparent;
  background-image: none;
}

.task-list::-webkit-scrollbar-button:vertical:start:decrement,
.task-list::-webkit-scrollbar-button:vertical:end:increment {
  display: block;
  height: 0;
  border: 0;
  color: transparent;
  background: transparent;
  background-image: none;
}

.task-list::-webkit-scrollbar-corner {
  background: transparent;
}

.task-item {
  margin: -4px -8px 0;
  padding: 4px 8px 10px;
  border-radius: 4px;
  transition: background var(--dur-press) var(--ease-out),
    opacity var(--dur-state) var(--ease-out);
}

.task-item:hover,
.task-item:focus-within {
  background: var(--focus-bg);
}

.task-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding-bottom: 5px;
  border-bottom: 1px dashed var(--rule);
  font-size: 13px;
  cursor: pointer;
}

.task-item.status-row-active .task-check,
.task-item.status-row-active .title-input,
.task-item.status-row-active .task-meta,
.task-item.status-row-active .due-chip {
  color: var(--theme);
}

.task-item.status-row-active .title-input {
  font-weight: 700;
}

.task-item.status-row-active .status-chip,
.task-item.status-row-active .task-status {
  color: var(--theme);
}

.task-title {
  display: flex;
  gap: 0;
  align-items: flex-start;
  min-width: 0;
}

.task-check,
.subtask-check {
  min-width: 32px;
  min-height: 32px;
  padding: 0;
  color: color-mix(in srgb, var(--ink) 85%, transparent);
  background: transparent;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 1.5px;
  line-height: 19px;
  text-align: left;
  transition: color var(--dur-press) var(--ease-out),
    transform var(--dur-press) var(--ease-out);
}

.task-check {
  display: inline-flex;
  align-items: flex-start;
  height: 19px;
  min-height: 19px;
  padding-top: 0;
}

.subtask-check {
  display: inline-flex;
  align-items: flex-start;
  min-width: 24px;
  min-height: 26px;
  height: 26px;
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: 1px;
  line-height: 17px;
}

.title-input {
  width: auto;
  max-width: 100%;
  min-width: 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: text;
  field-sizing: content;
  font-size: 13px;
  line-height: 1.45;
  text-overflow: ellipsis;
}

.task-meta {
  position: relative;
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(42px, auto);
  align-items: center;
  justify-items: end;
  gap: 10px;
  color: var(--muted);
  font-size: 11px;
  white-space: nowrap;
}

.status-chip {
  position: relative;
  display: inline-grid;
  align-items: center;
  min-height: 24px;
  color: var(--muted);
  transition: color var(--dur-state) var(--ease-out);
}

.status-chip.status-pending {
  color: color-mix(in srgb, var(--ink) 52%, transparent);
}

.status-chip.status-active {
  color: var(--theme);
}

.status-chip.status-done {
  color: color-mix(in srgb, var(--ink) 64%, transparent);
}

.status-chip.status-discarded {
  color: color-mix(in srgb, var(--ink) 28%, transparent);
}

.task-status {
  max-width: 64px;
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
  font-size: 11px;
  text-align: right;
}

.due-chip,
.due-button {
  min-width: 0;
  min-height: 24px;
  padding: 0;
  border: 0;
  color: color-mix(in srgb, var(--ink) 46%, transparent);
  background: transparent;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  transition: color var(--dur-press) var(--ease-out);
}

.due-button:hover {
  color: var(--ink);
}

.due-input {
  position: absolute;
  right: 32px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.task-detail {
  display: grid;
  gap: 3px;
  overflow: visible;
  padding: 6px 0 2px 40px;
}

.detail-input {
  width: 100%;
  min-height: 22px;
  resize: none;
  overflow: hidden;
  border: 0;
  color: rgba(17, 17, 17, .76);
  background: transparent;
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.48;
  text-wrap: pretty;
}

.detail-input::placeholder {
  color: rgba(17, 17, 17, .24);
}

.detail-input:focus::placeholder {
  color: rgba(17, 17, 17, .36);
}

.subtask-list {
  display: grid;
  gap: 0;
  margin-top: -3px;
  color: rgba(17, 17, 17, .72);
  font-size: 12px;
}

.subtask-item {
  display: flex;
  align-items: flex-start;
  gap: 4px;
  min-height: 26px;
  border-radius: 3px;
  transition: background var(--dur-press) var(--ease-out);
}

.task-item:hover .subtask-item:hover,
.task-item:focus-within .subtask-item:focus-within {
  background: var(--focus-bg-strong);
}

.subtask-input {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  min-height: 26px;
  resize: none;
  overflow: hidden;
  border: 0;
  color: inherit;
  background: transparent;
  font-family: inherit;
  font-size: 12px;
  line-height: 1.45;
  padding: 4px 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.subtask-item .subtask-check {
  min-height: 26px;
  padding-top: 4px;
}

.subtask-item.is-done .subtask-input {
  color: color-mix(in srgb, var(--ink) 70%, transparent);
}

.task-item.is-discarded .title-input,
.subtask-item.is-discarded .subtask-input {
  color: color-mix(in srgb, var(--ink) 38%, transparent);
}

.empty-state {
  padding: 34px 0 28px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.task-add-form {
  flex: 0 0 auto;
  padding: 12px 20px 12px 60px;
  border-bottom: 1px solid var(--faint);
}

.task-add-form input {
  width: 100%;
  min-height: 32px;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-size: 11px;
  text-transform: uppercase;
}

.task-add-form input::placeholder {
  color: rgba(17, 17, 17, .38);
}

.rollover-dialog {
  width: min(420px, calc(100vw - 40px));
  border: 1px solid var(--rule);
  color: var(--ink);
  background: var(--panel);
  padding: 24px;
  overscroll-behavior: contain;
  opacity: 1;
  transform: translateY(0) scale(1);
  transition: opacity var(--dur-state) var(--ease-out),
    transform var(--dur-state) var(--ease-out),
    overlay var(--dur-state) allow-discrete,
    display var(--dur-state) allow-discrete;
}

.rollover-dialog:not([open]) {
  opacity: 0;
  transform: translateY(8px) scale(.98);
}

@starting-style {
  .rollover-dialog[open] {
    opacity: 0;
    transform: translateY(8px) scale(.98);
  }
}

.rollover-dialog::backdrop {
  background: rgba(251, 251, 251, .72);
  opacity: 1;
  transition: opacity var(--dur-state) var(--ease-out),
    overlay var(--dur-state) allow-discrete,
    display var(--dur-state) allow-discrete;
}

.rollover-dialog:not([open])::backdrop {
  opacity: 0;
}

@starting-style {
  .rollover-dialog[open]::backdrop {
    opacity: 0;
  }
}

.rollover-dialog h2 {
  margin: 0 0 12px;
  font-size: 20px;
  text-wrap: balance;
}

.rollover-dialog p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
  text-wrap: pretty;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 22px;
  font-size: 12px;
}

.dialog-actions button {
  border-bottom: 1px dashed var(--rule);
}

.dialog-actions .primary {
  color: var(--ink);
  border-bottom-color: var(--theme);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 860px) {
  .workspace {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 28px;
    padding: max(28px, env(safe-area-inset-top))
      max(28px, env(safe-area-inset-right))
      max(28px, env(safe-area-inset-bottom))
      max(28px, env(safe-area-inset-left));
  }

  .day-flow {
    align-self: auto;
    display: block;
    flex: 0 0 auto;
    height: auto;
    min-height: 0;
    width: 100%;
  }

  .day-flow-grid {
    grid-template-columns: repeat(45, minmax(0, 1fr));
  }


  .paper-stack {
    height: min(70vh, 620px);
    min-height: 420px;
  }
}

@media (max-width: 560px) {
  .day-flow {
    padding: 14px;
  }

  .day-flow-grid {
    gap: 2px;
    grid-template-columns: repeat(45, minmax(0, 1fr));
  }

  .paper-stack {
    --stack-shift-x: 6px;
    --stack-shift-y: 7px;
  }

  .paper-tabs {
    padding-left: 10px;
    font-size: 11px;
  }

  .paper-tabs button {
    padding: 8px 12px;
  }

  .task-add-form {
    padding-left: 20px;
  }

  .task-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .task-meta {
    grid-template-columns: minmax(0, 1fr) auto;
    justify-items: start;
    padding-left: 40px;
    white-space: normal;
  }

  .task-detail {
    padding-left: 40px;
  }
}

@keyframes task-enter {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-item.is-entering {
  animation: task-enter var(--dur-enter) var(--ease-out);
}

@keyframes detail-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-detail.detail-opening {
  animation: detail-open var(--dur-state) var(--ease-out);
}

@keyframes subtask-leave {
  to {
    opacity: 0;
    transform: translateX(8px);
  }
}

.subtask-item.is-leaving {
  animation: subtask-leave var(--dur-press) var(--ease-in) forwards;
  pointer-events: none;
}

/* 切换纸张时用纸面亮度确认状态变化，避免位移造成抖动 */
@keyframes paper-surface-switch {
  0% {
    border-color: rgba(17, 17, 17, .36);
    box-shadow: 0 3px 16px rgba(17, 17, 17, .08);
  }
  100% {
    border-color: var(--rule);
    box-shadow: 0 2px 12px rgba(17, 17, 17, .05);
  }
}

@keyframes content-soft-switch {
  0% {
    opacity: .78;
  }
  100% {
    opacity: 1;
  }
}

.paper-content.is-switching {
  animation: paper-surface-switch var(--dur-switch) var(--ease-out);
}

.paper-content.is-switching .task-add-form,
.paper-content.is-switching .task-list {
  animation: content-soft-switch var(--dur-switch) var(--ease-out);
}