.clock-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.clock-stats-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

.study-timeline-shell {
  position: sticky;
  top: 87px;
  z-index: 18;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--line);
}

.study-timeline {
  position: relative;
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding: 12px 20px 14px;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}

.study-timeline::-webkit-scrollbar { display: none; }

.study-timeline::before {
  content: "";
  position: absolute;
  top: 29px;
  left: 42px;
  right: 42px;
  height: 1px;
  background: var(--line);
}

.study-day-node {
  position: relative;
  z-index: 1;
  width: 66px;
  min-width: 66px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  text-align: center;
  cursor: pointer;
  scroll-snap-align: center;
}

.study-day-dot {
  display: block;
  width: 9px;
  height: 9px;
  margin: 13px auto 8px;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: #b8bfbe;
  box-shadow: 0 0 0 1px var(--line);
}

.study-day-node.has-records .study-day-dot { background: var(--green); }
.study-day-node.active { color: var(--ink); }
.study-day-node.active .study-day-dot {
  width: 12px;
  height: 12px;
  margin-top: 11px;
  margin-bottom: 7px;
  background: var(--red);
  box-shadow: 0 0 0 3px var(--red-soft);
}

.study-day-week { display: block; font-size: 12px; }
.study-day-date { display: block; margin-top: 2px; font-size: 14px; font-variant-numeric: tabular-nums; }

.clock-content { padding-bottom: 18px; overflow: hidden; }

.clock-card-carousel {
  width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.clock-card-carousel::-webkit-scrollbar,
.fullscreen-mode-carousel::-webkit-scrollbar { display: none; }

.clock-card-track {
  display: flex;
  align-items: stretch;
  width: 100%;
}

.clock-mode-card {
  flex: 0 0 100%;
  width: 100%;
  min-width: 100%;
  min-height: 500px;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.live-clock-card {
  position: relative;
  padding: 28px 20px 78px;
  background: var(--surface);
  text-align: center;
}

.question-timer-card {
  position: relative;
  padding: 22px 20px 76px;
  background: #f4f7f6;
}

.question-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.question-card-header h2 { font-size: 24px; font-weight: 500; line-height: 1.25; }

.question-card-tools {
  display: flex;
  gap: 8px;
}

.question-card-tools .icon-button {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
}

.question-card-tools button:disabled,
.fullscreen-question-tools button:disabled { opacity: 0.35; cursor: default; }

.question-settings {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.question-settings label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.question-settings input {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  font-variant-numeric: tabular-nums;
}

.question-settings input:disabled { background: var(--surface-strong); color: var(--muted); }

.question-progress-wrap {
  position: relative;
  container-type: inline-size;
  width: 178px;
  height: 178px;
  margin: 18px auto 0;
}

.question-progress { display: block; width: 100%; height: 100%; }

.question-progress-track,
.question-progress-value {
  fill: none;
  stroke-width: 7;
}

.question-progress-track { stroke: #dfe5e3; }

.question-progress-value {
  stroke: var(--red);
  stroke-linecap: round;
  stroke-dasharray: 100;
  stroke-dashoffset: 0;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
  transition: stroke-dashoffset 220ms linear, stroke 180ms ease;
}

.question-progress-wrap.completed .question-progress-value,
.fullscreen-question-progress.completed .question-progress-value { opacity: 0; }

.question-progress-copy {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
}

.question-progress-copy span { color: var(--muted); font-size: 13px; }
.question-progress-copy strong {
  margin-top: 5px;
  font-family: "SF Mono", "Roboto Mono", "Courier New", monospace;
  font-size: 31px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  white-space: nowrap;
}

.question-progress-copy strong.countdown-long { font-size: 26px; font-size: 15cqi; }
.question-progress-copy strong.countdown-very-long { font-size: 23px; font-size: 13cqi; }

.question-round-status {
  margin-top: 11px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
}

.question-start-button {
  min-width: 180px;
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 14px auto 0;
  padding: 0 22px;
  border: 1px solid var(--red);
  border-radius: 5px;
  background: var(--red);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

.question-start-button[hidden] { display: none; }
.question-fullscreen-enter { right: 20px; }

.clock-mode-dots,
.fullscreen-mode-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
}

.clock-mode-dots {
  height: 38px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.clock-mode-dots button,
.fullscreen-mode-dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: #b9bfbe;
  cursor: pointer;
  transition: width 180ms ease, background 180ms ease;
}

.clock-mode-dots button.active,
.fullscreen-mode-dots button.active { width: 22px; border-radius: 4px; background: var(--red); }

.clock-fullscreen-enter,
.fullscreen-clock-exit {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 4px;
  cursor: pointer;
}

.clock-fullscreen-enter {
  position: absolute;
  right: 20px;
  bottom: 18px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
}

.clock-fullscreen-enter .lucide,
.fullscreen-clock-exit .lucide { width: 21px; height: 21px; }

.fullscreen-clock[hidden] { display: none; }

.fullscreen-clock {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: block;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #fff;
}

.fullscreen-mode-carousel {
  position: absolute;
  inset: 0;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.fullscreen-mode-track { display: flex; width: 100%; height: 100%; }

.fullscreen-mode-slide {
  position: relative;
  flex: 0 0 100%;
  display: grid;
  place-items: center;
  width: 100%;
  min-width: 100%;
  height: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  background: #000;
}

.fullscreen-clock-time {
  width: 100%;
  padding: 0 72px;
  border: 0;
  background: transparent;
  color: #fff;
  font-family: "SF Mono", "Roboto Mono", "Courier New", monospace;
  font-size: 96px;
  font-weight: 400;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
}

.fullscreen-question-remaining {
  position: absolute;
  left: max(28px, env(safe-area-inset-left));
  top: 50%;
  display: grid;
  transform: translateY(-50%);
  text-align: left;
}

.fullscreen-question-remaining strong {
  font-family: "SF Mono", "Roboto Mono", "Courier New", monospace;
  font-size: clamp(42px, 8vw, 92px);
  font-weight: 400;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.fullscreen-question-remaining span {
  margin-top: 9px;
  color: #aeb4b3;
  font-size: clamp(13px, 1.6vw, 18px);
  line-height: 1.5;
}

.fullscreen-question-tools {
  position: absolute;
  top: max(22px, env(safe-area-inset-top));
  right: max(22px, env(safe-area-inset-right));
  display: flex;
  gap: 10px;
}

.fullscreen-question-tools button {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid #555;
  border-radius: 4px;
  background: #111;
  color: #fff;
  cursor: pointer;
}

.fullscreen-question-tools .lucide { width: 22px; height: 22px; }

.fullscreen-question-progress {
  position: relative;
  container-type: inline-size;
  width: clamp(220px, 45vmin, 430px);
  height: clamp(220px, 45vmin, 430px);
}

.fullscreen-question-progress svg { display: block; width: 100%; height: 100%; }
.fullscreen-question-progress .question-progress-track { stroke: #242929; stroke-width: 6; }
.fullscreen-question-progress .question-progress-value { stroke: #fff; stroke-width: 6; }

.fullscreen-question-progress > div {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
}

.fullscreen-question-progress span { color: #b8bdbc; font-size: clamp(14px, 2vw, 21px); }
.fullscreen-question-progress strong {
  margin-top: 8px;
  font-family: "SF Mono", "Roboto Mono", "Courier New", monospace;
  font-size: clamp(48px, 10vmin, 110px);
  font-weight: 400;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.fullscreen-question-progress strong.countdown-long { font-size: 64px; font-size: 15cqi; }
.fullscreen-question-progress strong.countdown-very-long { font-size: 54px; font-size: 13cqi; }
.fullscreen-question-progress small { margin-top: 12px; color: #b8bdbc; font-size: clamp(13px, 1.7vw, 18px); }

.fullscreen-mode-dots {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: max(24px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
}

.fullscreen-mode-dots button { background: #555; }
.fullscreen-mode-dots button.active { background: #fff; }

.fullscreen-clock-exit {
  position: absolute;
  right: max(22px, env(safe-area-inset-right));
  bottom: max(22px, env(safe-area-inset-bottom));
  border: 1px solid #555;
  background: #111;
  color: #fff;
}

body.clock-fullscreen-active { overflow: hidden; background: #000; }

@media (orientation: portrait) {
  .fullscreen-clock.force-landscape {
    inset: auto;
    top: 50%;
    left: 50%;
    width: 100vh;
    height: 100vw;
    transform: translate(-50%, -50%) rotate(90deg);
  }
}

@media (orientation: landscape) and (min-width: 640px) {
  .fullscreen-clock-time { font-size: 140px; }
}

@media (orientation: landscape) and (min-width: 1000px) {
  .fullscreen-clock-time { font-size: 190px; }
}

.live-clock {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: "SF Mono", "Roboto Mono", "Courier New", monospace;
  font-size: 62px;
  font-weight: 400;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  cursor: pointer;
}

.clock-format-hint { margin-top: 8px; color: var(--muted); font-size: 13px; }

.study-subject-picker {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  max-width: 360px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 15px;
  text-align: left;
}

.study-subject-picker label { white-space: nowrap; }

.study-subject-control {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.study-subject-picker select,
.study-subject-picker input {
  width: 100%;
  min-height: 46px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  font-family: inherit;
  font-size: 16px;
}

.study-subject-picker select {
  appearance: auto;
  cursor: pointer;
}

.study-subject-picker select:disabled,
.study-subject-picker input:disabled {
  background: var(--surface-strong);
  color: var(--muted);
  cursor: default;
}

.study-subject-picker input[hidden] { display: none; }

.active-elapsed {
  width: fit-content;
  margin: 16px auto 0;
  padding: 7px 10px;
  border: 1px solid #bfd9d1;
  border-radius: 4px;
  background: var(--green-soft);
  color: var(--green);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.timer-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}

.timer-actions button {
  min-height: 46px;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
}

.timer-actions .lucide { width: 18px; height: 18px; }

.study-start-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 190px;
  padding: 0 24px;
  border: 1px solid var(--red);
  background: var(--red);
  color: #fff;
}

.pause-study-button, .stop-study-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  flex: 1 1 0;
  max-width: 190px;
  padding: 0 14px;
}

.pause-study-button { border: 1px solid var(--line); background: var(--bg); }
.stop-study-button { border: 1px solid #e3b9b9; background: var(--red-soft); color: var(--red); }

.record-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 20px 12px;
}

.record-heading h2 { font-size: 22px; font-weight: 500; }

.record-heading-actions {
  display: flex;
  align-items: center;
  gap: 7px;
}

.record-day-total {
  margin-right: 3px;
  color: var(--green);
  font-size: 15px;
  white-space: nowrap;
}

.record-heading .record-transfer-button {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
}

.record-heading .record-transfer-button:disabled { opacity: 0.35; cursor: default; }
.record-heading .record-transfer-button .lucide { width: 18px; height: 18px; }
.study-record-file { display: none; }

.study-record-transfer-status {
  margin: -3px 20px 8px;
  color: var(--green);
  font-size: 13px;
  line-height: 1.55;
}

.study-record-transfer-status.error { color: var(--red); }
.study-record-transfer-status[hidden] { display: none; }

.study-record-list { padding: 0 20px; }

.study-record {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 38px;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.record-duration {
  font-family: "Songti SC", "STSong", "SimSun", Georgia, serif;
  font-size: 24px;
  font-weight: 400;
  line-height: 1.35;
}

.record-subject {
  width: fit-content;
  margin-bottom: 6px;
  padding: 3px 7px;
  border: 1px solid #bfd9d1;
  border-radius: 3px;
  background: var(--green-soft);
  color: var(--green);
  font-size: 13px;
  line-height: 1.35;
}

.record-time-range {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.edit-record-button {
  align-self: center;
  width: 38px;
  height: 38px;
  border: 0;
  background: transparent;
  color: var(--muted);
}

.clock-empty {
  padding: 46px 10px;
  color: var(--muted);
  text-align: center;
  font-size: 15px;
  line-height: 1.7;
}

.clock-stats-panel[hidden], .timer-modal[hidden] { display: none; }

.stats-header {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 42px;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.stats-content { padding: 18px 20px 28px; }
.stats-range { margin: 0; }
.stats-period { margin-top: 13px; color: var(--muted); font-size: 14px; text-align: center; }

.stats-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.stat-metric {
  min-width: 0;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
}

.stat-metric span { display: block; color: var(--muted); font-size: 13px; }
.stat-metric strong { display: block; margin-top: 7px; font-size: 22px; font-weight: 500; line-height: 1.3; }

.study-chart-section { margin-top: 28px; }

.stats-section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.stats-section-heading h2 { font-size: 20px; font-weight: 500; }
.stats-section-heading span { color: var(--muted); font-size: 13px; }

.study-bar-chart {
  display: flex;
  align-items: flex-end;
  gap: 7px;
  min-height: 176px;
  margin-top: 16px;
  padding: 14px 4px 0;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}

.study-bar-chart::-webkit-scrollbar { display: none; }

.chart-column {
  display: grid;
  grid-template-rows: 124px 34px;
  align-items: end;
  justify-items: center;
  flex: 1 0 34px;
  min-width: 34px;
}

.chart-bar-track {
  display: flex;
  align-items: flex-end;
  width: 18px;
  height: 120px;
  background: var(--surface-strong);
}

.chart-bar-fill { width: 100%; min-height: 2px; background: var(--green); }
.chart-column.peak .chart-bar-fill { background: var(--red); }
.chart-column label { align-self: start; padding-top: 7px; color: var(--muted); font-size: 11px; white-space: nowrap; }

.peak-section {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.peak-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid #edd6b5;
  border-radius: 6px;
  background: #fbf3e8;
  color: #9b6422;
}

.peak-section p { color: var(--muted); font-size: 13px; }
.peak-section h2 { margin-top: 3px; font-size: 20px; font-weight: 500; }
.peak-section span { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; }

.timer-modal {
  position: absolute;
  inset: 0;
  z-index: 300;
  display: grid;
  align-items: end;
}

.timer-modal-backdrop { position: absolute; inset: 0; background: rgba(15, 20, 20, 0.42); }

.timer-dialog {
  position: relative;
  z-index: 1;
  width: 100%;
  max-height: 90%;
  padding: 20px;
  overflow-y: auto;
  border-radius: 8px 8px 0 0;
  background: var(--bg);
}

.timer-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.timer-dialog-header h2 { font-size: 22px; font-weight: 500; }

.timer-dialog form { display: grid; gap: 15px; margin-top: 20px; }
.timer-dialog label { display: grid; gap: 7px; color: var(--muted); font-size: 14px; }
.timer-dialog label[hidden] { display: none; }
.timer-dialog input,
.timer-dialog select {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
}

.timer-dialog select { appearance: auto; }

@media (max-width: 360px) {
  .study-subject-picker { grid-template-columns: 1fr; gap: 7px; }
}

.form-error { min-height: 20px; color: var(--red); font-size: 13px; }

.timer-dialog-actions { display: grid; grid-template-columns: 1fr 1.4fr; gap: 10px; }
.timer-dialog-actions button { min-height: 46px; border-radius: 5px; font-size: 15px; cursor: pointer; }
.delete-record-button { border: 1px solid #e3b9b9; background: var(--red-soft); color: var(--red); }
.save-record-button { border: 1px solid var(--ink); background: var(--ink); color: #fff; }

@media (min-width: 600px) {
  .live-clock { font-size: 76px; }
  .study-timeline { padding-left: 28px; padding-right: 28px; }
  .live-clock-card { padding: 34px 28px 86px; }
  .question-timer-card { padding-left: 28px; padding-right: 28px; }
  .clock-fullscreen-enter { right: 28px; bottom: 24px; }
  .record-heading, .study-record-list, .stats-content { padding-left: 28px; padding-right: 28px; }
  .study-record-transfer-status { margin-left: 28px; margin-right: 28px; }
  .timer-dialog { max-width: 560px; margin: 0 auto 22px; border-radius: 8px; }
}

@media (min-width: 768px) {
  .study-timeline-shell { top: 0; }
  .clock-content, .clock-stats-panel { width: 100%; }
  .study-record-list, .news-list { display: block; }
}