/* LocaLingo learning center + side panel. Warm white and deep green, matching the
   popup; system dark mode; readable at 200% zoom and phone width. */

:root {
  color-scheme: light dark;
  --bg: #f7f8f4;
  --panel: #ffffff;
  --fg: #1f2a28;
  --muted: #66736f;
  --line: #e0e6df;
  --soft: #eef2ec;
  --accent: #285e50;
  --accent-fg: #ffffff;
  --tint: #e5efe7;
  --mark: #fbecc0;
  --error: #a8443b;
  --ok: #2f7a55;
  --r1: #b2493f;
  --r2: #a16a1f;
  --r3: #2f7a55;
  --r4: #285e50;
  --shadow: 0 1px 2px rgba(30, 50, 40, 0.06), 0 6px 18px rgba(30, 50, 40, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --read: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Songti SC", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161c1a;
    --panel: #1f2825;
    --fg: #ebf0ec;
    --muted: #a3b2aa;
    --line: #33403a;
    --soft: #27322e;
    --accent: #a5d1b9;
    --accent-fg: #13201a;
    --tint: #283b31;
    --mark: #5a4a1c;
    --error: #f0a69c;
    --ok: #9bcead;
    --r1: #f0a69c;
    --r2: #e3bb79;
    --r3: #9bcead;
    --r4: #a5d1b9;
    --shadow: none;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 var(--font);
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 24px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 17px;
  font-weight: 620;
}

h3 {
  font-size: 15px;
}

a {
  color: var(--accent);
}

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

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 12px;
  top: 12px;
  z-index: 10;
  padding: 6px 12px;
  background: var(--panel);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 13px;
}

kbd {
  padding: 0 5px;
  border: 1px solid currentColor;
  border-radius: 4px;
  font: 11px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  opacity: 0.75;
}

mark {
  padding: 0 2px;
  border-radius: 3px;
  background: var(--mark);
  color: inherit;
}

/* --- controls --------------------------------------------------------------------- */

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--accent);
}

.btn.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
}

.btn.primary:hover {
  filter: brightness(1.07);
}

.btn.danger {
  color: var(--error);
}

.btn.big {
  min-height: 46px;
  padding: 10px 28px;
  font-size: 16px;
}

.btn:disabled {
  opacity: 0.55;
  cursor: default;
}

.btn.file {
  position: relative;
}

.link,
.icon {
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.link {
  color: var(--accent);
  font-size: 13.5px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 20px;
}

.icon:hover {
  background: var(--soft);
}

input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
  width: 100%;
  min-height: 38px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

textarea {
  resize: vertical;
  line-height: 1.5;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--tint);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
  font-size: 13.5px;
  color: var(--muted);
}

fieldset.field {
  margin: 0;
  padding: 0;
  border: 0;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  cursor: pointer;
}

.check input,
.seg input {
  accent-color: var(--accent);
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.grid2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px 16px;
}

.form-msg {
  min-height: 1.2em;
  font-size: 13.5px;
}

.form-msg[data-kind="error"] {
  color: var(--error);
}

.form-msg[data-kind="ok"] {
  color: var(--ok);
}

.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  color: var(--fg);
}

/* --- learning center layout ---------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px max(16px, calc((100vw - 1000px) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.brand small {
  color: var(--muted);
  font-weight: 400;
}

.nav {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--fg);
}

.nav a[aria-current="page"] {
  background: var(--tint);
  color: var(--fg);
  font-weight: 600;
}

.badge {
  min-width: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 12px;
  line-height: 20px;
  text-align: center;
}

.sync-state {
  margin-left: auto;
  color: var(--muted);
  font-size: 12.5px;
  white-space: nowrap;
}

.sync-state[data-kind="error"] {
  color: var(--error);
}

main {
  padding: 24px max(16px, calc((100vw - 1000px) / 2)) 64px;
}

main:focus {
  outline: none;
}

.page {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page.narrow {
  max-width: 680px;
  margin: 0 auto;
}

.page-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.filters input[type="search"] {
  flex: 1 1 240px;
  width: auto;
}

.filters select {
  flex: 0 1 auto;
  width: auto;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.card[role="button"] {
  cursor: pointer;
}

.card[role="button"]:hover {
  border-color: var(--accent);
}

.muted-card {
  opacity: 0.78;
}

.card-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.card-head h3 {
  font-size: 18px;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.card-due {
  margin-left: auto;
  color: var(--muted);
  font-size: 12.5px;
  white-space: nowrap;
}

.chip {
  padding: 0 8px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-size: 12px;
}

.meaning-lines {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 14.5px;
}

.meaning-lines .en {
  font-size: 14px;
}

.meaning-lines .zh + .en,
.meaning-lines .en + .zh {
  color: var(--muted);
}

.meaning-lines .pos {
  margin-right: 6px;
  color: var(--muted);
  font-style: italic;
  font-size: 13px;
}

.meaning-lines .mine {
  font-weight: 600;
}

.tag {
  margin-right: 6px;
  padding: 0 6px;
  border-radius: 6px;
  background: var(--tint);
  color: var(--accent);
  font-size: 11.5px;
  font-weight: 600;
}

.quote,
.sentence {
  font-family: var(--read);
  font-size: 15.5px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.quote {
  padding-left: 10px;
  border-left: 2px solid var(--line);
  color: var(--fg);
}

.meta {
  color: var(--muted);
  font-size: 12.5px;
  overflow-wrap: anywhere;
}

.empty {
  padding: 28px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  color: var(--muted);
  text-align: center;
}

.onboard {
  max-width: 1000px;
  margin: 0 auto 18px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--tint);
}

.onboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 12px 0;
}

.panel-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}

.progress {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.progress progress {
  flex: 1 1 200px;
  accent-color: var(--accent);
}

.import-preview {
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--soft);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: calc(100vw - 32px);
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--fg);
  color: var(--bg);
  font-size: 14px;
  transform: translateX(-50%);
}

.toast .link {
  color: var(--bg);
}

/* --- item dialog ------------------------------------------------------------------- */

.drawer {
  width: min(560px, 100vw);
  max-width: 100vw;
  height: 100dvh;
  max-height: 100dvh;
  margin: 0 0 0 auto;
  padding: 0;
  border: 0;
  border-left: 1px solid var(--line);
  background: var(--panel);
  color: var(--fg);
}

.drawer::backdrop {
  background: rgba(20, 30, 25, 0.35);
}

.drawer-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.drawer-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 20px 22px 12px;
}

.drawer-head > div {
  flex: 1;
  min-width: 0;
}

.drawer-head h2 {
  font-size: 24px;
  overflow-wrap: anywhere;
}

.drawer-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 4px 22px 18px;
  overflow-y: auto;
}

.drawer-foot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-top: 1px solid var(--line);
}

.drawer-foot .form-msg {
  flex: 1;
}

.meaning {
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--soft);
}

.encounters {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.encounters li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* --- review ---------------------------------------------------------------------- */

.review-start,
.review-done {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
}

.review-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px 26px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.review-card:focus {
  outline: none;
  border-color: var(--accent);
}

.review-prompt {
  font-family: var(--read);
  font-size: 21px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.big-word {
  font-family: var(--font);
  font-size: 30px;
}

.review-answer {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.note {
  margin-top: 6px;
  font-size: 14px;
}

.ratings {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.rate {
  flex-direction: column;
  gap: 0;
  min-height: 54px;
  border-radius: 12px;
}

.rate small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
}

.rate.r1 {
  border-color: color-mix(in srgb, var(--r1) 45%, var(--line));
}

.rate.r2 {
  border-color: color-mix(in srgb, var(--r2) 45%, var(--line));
}

.rate.r3 {
  border-color: color-mix(in srgb, var(--r3) 45%, var(--line));
}

.rate.r4 {
  border-color: color-mix(in srgb, var(--r4) 45%, var(--line));
}

/* --- side panel ------------------------------------------------------------------- */

body.panel {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-size: 14px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px 8px;
}

.pill {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  font-size: 13px;
  cursor: pointer;
}

.tabs {
  display: flex;
  gap: 4px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
}

.tabs button {
  padding: 8px 12px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--muted);
  cursor: pointer;
}

.tabs button[aria-selected="true"] {
  border-bottom-color: var(--accent);
  color: var(--fg);
  font-weight: 600;
}

body.panel main {
  flex: 1;
  padding: 14px;
}

body.panel main section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.search {
  display: flex;
  gap: 8px;
}

.search input {
  flex: 1;
}

.pin-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12.5px;
}

.item-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.item-row {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  text-align: left;
  cursor: pointer;
}

.item-row span {
  color: var(--muted);
  font-size: 13px;
}

.panel-foot {
  padding: 10px 14px 14px;
}

@media (max-width: 640px) {
  .topbar {
    flex-wrap: wrap;
    gap: 8px;
  }
  .sync-state {
    order: 2;
  }
  .nav {
    order: 3;
    width: 100%;
  }
  main {
    padding-top: 18px;
  }
  .ratings {
    grid-template-columns: repeat(2, 1fr);
  }
  .review-card,
  .review-start,
  .review-done {
    padding: 18px;
  }
  .review-prompt {
    font-size: 19px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}