:root {
  color-scheme: light;
  --paper: #f4f1eb;
  --paper-deep: #ebe7df;
  --surface: #fbfaf7;
  --surface-strong: #ffffff;
  --ink: #202322;
  --ink-soft: #5e625d;
  --ink-faint: #8e928b;
  --line: #d9d7d0;
  --line-strong: #c3c3bb;
  --accent: #d96543;
  --accent-deep: #a6402c;
  --accent-soft: #f3d9cf;
  --green: #3e7359;
  --yellow: #a77c31;
  --shadow: 0 18px 50px rgba(36, 35, 30, 0.08);
  --radius: 12px;
  --font-sans: "Avenir Next", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #1e211f;
  --paper-deep: #282c29;
  --surface: #252926;
  --surface-strong: #2d322e;
  --ink: #f1eee7;
  --ink-soft: #b8bbb4;
  --ink-faint: #858b83;
  --line: #3c423d;
  --line-strong: #596057;
  --accent: #ed8060;
  --accent-deep: #ffad93;
  --accent-soft: #4b3029;
  --green: #7bb18d;
  --yellow: #e1b96d;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

* { box-sizing: border-box; }

html { min-width: 320px; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  transition: background-color 180ms ease, color 180ms ease;
}

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

.app-shell { width: min(1440px, 100%); margin: 0 auto; padding: 0 42px; }

.topbar {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.wordmark { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 700; letter-spacing: -0.01em; text-decoration: none; }
.wordmark-mark { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--ink); border-radius: 8px; font-size: 10px; letter-spacing: -0.08em; }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.storage-status { display: inline-flex; align-items: center; gap: 7px; margin-right: 8px; padding: 6px 8px; border: 1px solid transparent; border-radius: 8px; background: none; color: var(--ink-soft); font: inherit; font-size: 12px; cursor: pointer; }
.storage-status:hover { background: var(--paper-deep); color: var(--ink); }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.storage-status[data-state="local"] .status-dot { background: var(--ink-faint); }
.storage-status[data-state="error"] .status-dot { background: #a95445; }
.storage-status[data-state="syncing"] .status-dot { background: var(--accent); }

.button, .icon-button, .text-button, .view-tab { border: 0; background: none; color: var(--ink); }
.button { min-height: 38px; padding: 0 15px; border-radius: 9px; font-weight: 700; font-size: 13px; transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease; }
.button:active { transform: translateY(1px) scale(0.98); }
.button-primary { background: var(--accent); color: #fffaf6; }
.button-primary:hover { background: var(--accent-deep); }
.button-outline { border: 1px solid var(--line-strong); background: transparent; }
.button-outline:hover, .button-quiet:hover { background: var(--paper-deep); }
.button-quiet { border: 1px solid transparent; color: var(--ink-soft); }
.icon-button { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; color: var(--ink-soft); font-size: 18px; }
.icon-button:hover { background: var(--paper-deep); color: var(--ink); }
.text-button { padding: 0; color: var(--accent-deep); font-size: 12px; font-weight: 700; }
.text-button:hover { text-decoration: underline; text-underline-offset: 3px; }
.danger-text { color: #a95445; }

.intro { display: flex; justify-content: space-between; gap: 48px; padding: 76px 0 56px; animation: enter 500ms cubic-bezier(.16, 1, .3, 1) both; }
.intro-copy { max-width: 660px; }
.eyebrow { margin: 0 0 13px; color: var(--accent-deep); font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 680px; margin-bottom: 19px; font-size: clamp(42px, 6vw, 78px); line-height: .98; letter-spacing: -.065em; font-weight: 700; }
.intro-lede { max-width: 520px; margin-bottom: 0; color: var(--ink-soft); font-size: 17px; line-height: 1.55; }
.intro-meta { align-self: flex-end; min-width: 150px; padding: 0 0 8px 26px; border-left: 1px solid var(--line-strong); }
.meta-label, .summary-label, .summary-note { display: block; color: var(--ink-faint); font-size: 11px; }
.intro-meta strong { display: block; margin: 5px 0 2px; font-size: 28px; letter-spacing: -.05em; }
.intro-meta span:last-child { color: var(--green); font-size: 12px; }

.summary-strip { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.summary-item { min-height: 118px; padding: 22px 24px 20px 0; border-right: 1px solid var(--line); }
.summary-item + .summary-item { padding-left: 24px; }
.summary-item:last-child { border-right: 0; }
.summary-item-accent strong { color: var(--accent-deep); }
.summary-item strong { display: block; margin: 8px 0 1px; font-size: 24px; letter-spacing: -.05em; }
.summary-item-action strong { margin-bottom: 3px; }

.workspace-grid { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 54px; padding: 58px 0 78px; }
.workspace-main { min-width: 0; }
.view-tabs { display: flex; gap: 24px; margin-bottom: 24px; border-bottom: 1px solid var(--line); }
.view-tab { position: relative; padding: 0 0 13px; color: var(--ink-faint); font-size: 13px; font-weight: 700; }
.view-tab::after { content: ""; position: absolute; right: 0; bottom: -1px; left: 0; height: 2px; background: transparent; }
.view-tab.is-active { color: var(--ink); }
.view-tab.is-active::after { background: var(--accent); }

.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 18px; }
.section-heading h2 { margin-bottom: 0; font-size: 25px; letter-spacing: -.04em; }
.section-heading p { max-width: 360px; margin-bottom: 0; color: var(--ink-soft); font-size: 13px; }
.plan-list { border-top: 1px solid var(--line-strong); }
.plan-row { display: grid; grid-template-columns: 34px minmax(0, 1fr) 136px 96px; gap: 18px; align-items: center; min-height: 104px; border-bottom: 1px solid var(--line); animation: enter 450ms cubic-bezier(.16, 1, .3, 1) both; animation-delay: calc(var(--row-index) * 45ms); }
.plan-row:hover { background: color-mix(in srgb, var(--surface) 60%, transparent); }
.lesson-check { appearance: none; width: 18px; height: 18px; border: 1px solid var(--line-strong); border-radius: 5px; background: transparent; }
.lesson-check:checked { border-color: var(--accent); background: var(--accent); box-shadow: inset 0 0 0 4px var(--surface); }
.lesson-number { color: var(--ink-faint); font-family: var(--font-mono); font-size: 11px; }
.lesson-title { margin: 0 0 5px; font-size: 16px; letter-spacing: -.02em; }
.lesson-description { max-width: 600px; margin: 0; color: var(--ink-soft); font-size: 12px; }
.lesson-meta { color: var(--ink-faint); font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.lesson-time { color: var(--ink-soft); font-family: var(--font-mono); font-size: 12px; text-align: right; }
.lesson-open { display: inline-flex; align-items: center; gap: 6px; margin-top: 9px; color: var(--accent-deep); font-size: 12px; font-weight: 700; text-decoration: none; }
.lesson-open:hover { text-decoration: underline; text-underline-offset: 3px; }
.progress-line { height: 4px; margin-top: 10px; overflow: hidden; background: var(--paper-deep); }
.progress-fill { height: 100%; background: var(--accent); transition: width 300ms ease; }

.focus-panel { align-self: start; position: sticky; top: 24px; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.focus-panel-head { display: flex; justify-content: space-between; gap: 14px; }
.focus-panel h2 { max-width: 200px; margin-bottom: 0; font-size: 21px; line-height: 1.05; letter-spacing: -.045em; }
.focus-live { align-self: flex-start; color: var(--green); font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: .1em; }
.focus-live.is-running { color: var(--accent-deep); }
.timer-mode { margin-top: 34px; color: var(--accent-deep); font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.timer-display { margin: 8px 0 25px; font-family: var(--font-mono); font-size: 54px; letter-spacing: -.1em; }
.field-label { display: block; margin-bottom: 7px; color: var(--ink-soft); font-size: 11px; font-weight: 700; }
.select-input, .notes-input { width: 100%; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface-strong); color: var(--ink); outline: none; }
.select-input { height: 40px; padding: 0 10px; }
.notes-input { padding: 10px; resize: vertical; line-height: 1.5; }
.select-input:focus, .notes-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.timer-actions { display: grid; grid-template-columns: 1fr 80px; gap: 8px; margin-top: 12px; }
.focus-note { margin: 15px 0 0; color: var(--ink-faint); font-size: 11px; line-height: 1.5; }
.focus-divider { margin: 24px 0 17px; border-top: 1px solid var(--line); }
.focus-footer { display: flex; justify-content: space-between; color: var(--ink-soft); font-size: 12px; }
.focus-footer strong { color: var(--ink); }

.library-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.resource-block { min-height: 200px; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.resource-block h3 { margin-bottom: 9px; font-size: 17px; letter-spacing: -.025em; }
.resource-block p { margin-bottom: 17px; color: var(--ink-soft); font-size: 12px; }
.resource-link { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; padding: 10px 0; border-top: 1px solid var(--line); color: var(--ink); font-size: 12px; text-decoration: none; }
.resource-link:hover { color: var(--accent-deep); }
.resource-link span:last-child { color: var(--accent-deep); font-size: 15px; }
.heatmap { display: grid; gap: 0; border-top: 1px solid var(--line-strong); }
.heatmap-row { display: grid; grid-template-columns: 86px minmax(0, 1fr) 95px; gap: 15px; align-items: center; min-height: 70px; border-bottom: 1px solid var(--line); }
.heatmap-priority { font-family: var(--font-mono); font-size: 10px; letter-spacing: .09em; text-transform: uppercase; }
.priority-critical { color: var(--accent-deep); }
.priority-high { color: var(--yellow); }
.priority-medium { color: var(--green); }
.heatmap-skill { font-size: 14px; }
.heatmap-source { color: var(--ink-faint); font-size: 11px; text-align: right; }

.history-list { border-top: 1px solid var(--line-strong); }
.history-row { display: flex; justify-content: space-between; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.history-row strong { font-size: 14px; }
.history-row span { color: var(--ink-soft); font-family: var(--font-mono); font-size: 12px; }
.empty-state { padding: 56px 0; color: var(--ink-soft); text-align: center; }

.footer { display: flex; justify-content: space-between; gap: 20px; padding: 22px 0 28px; border-top: 1px solid var(--line); color: var(--ink-faint); font-size: 11px; }

.lesson-dialog { width: min(620px, calc(100% - 32px)); max-height: calc(100% - 32px); padding: 28px; border: 1px solid var(--line-strong); border-radius: 14px; background: var(--surface); color: var(--ink); box-shadow: 0 24px 90px rgba(20, 20, 17, .2); }
.lesson-dialog::backdrop { background: rgba(27, 29, 27, .5); backdrop-filter: blur(4px); }
.dialog-head { display: flex; justify-content: space-between; gap: 20px; }
.dialog-head h2 { margin-bottom: 15px; font-size: 30px; letter-spacing: -.05em; }
.dialog-description { max-width: 560px; margin-bottom: 22px; color: var(--ink-soft); }
.dialog-stats { display: flex; gap: 25px; margin-bottom: 24px; padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dialog-stat strong, .dialog-stat span { display: block; }
.dialog-stat strong { font-family: var(--font-mono); font-size: 16px; }
.dialog-stat span { color: var(--ink-faint); font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.dialog-section { margin-top: 22px; }
.dialog-section h3 { margin-bottom: 10px; font-size: 14px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 26px; }
.sync-dialog { overflow-y: auto; }
.sync-tabs { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 18px; border-bottom: 1px solid var(--line); }
.sync-tab { padding: 9px 12px; border: 0; border-bottom: 2px solid transparent; background: none; color: var(--ink-soft); font: inherit; font-size: 12px; font-weight: 700; cursor: pointer; }
.sync-tab:hover { color: var(--ink); }
.sync-tab[aria-selected="true"] { border-bottom-color: var(--accent); color: var(--ink); }
.sync-panel { display: grid; gap: 10px; }
.sync-panel[hidden] { display: none; }
.sync-panel .dialog-actions { margin-top: 8px; }
.sync-hint { margin: 0; color: var(--ink-soft); font-size: 12px; line-height: 1.55; }
.sync-account { display: flex; align-items: center; gap: 8px; margin: 0 0 18px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--paper-deep); font-size: 13px; }
.sync-block { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.sync-block .dialog-actions { margin-top: 12px; }
.sync-message { margin: 16px 0 0; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }
.sync-message[data-state="error"] { color: #a95445; }
.sync-message[data-state="ok"] { color: var(--green); }
.dialog-resource { display: flex; justify-content: space-between; gap: 14px; padding: 11px 0; border-top: 1px solid var(--line); color: var(--ink); font-size: 12px; text-decoration: none; }
.dialog-resource:hover { color: var(--accent-deep); }

@keyframes enter { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; } }

@media (max-width: 900px) {
  .app-shell { padding: 0 24px; }
  .workspace-grid { grid-template-columns: 1fr; gap: 38px; }
  .focus-panel { position: static; }
  .summary-strip { grid-template-columns: repeat(2, 1fr); }
  .summary-item:nth-child(2) { border-right: 0; }
  .summary-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 640px) {
  .app-shell { padding: 0 17px; }
  .topbar { min-height: 62px; }
  .topbar-actions { gap: 4px; }
  .topbar-actions .button-quiet { display: none; }
  .storage-status { margin-right: 0; }
  .storage-status #sync-label { display: none; }
  .intro { display: block; padding: 52px 0 38px; }
  h1 { font-size: clamp(40px, 14vw, 60px); }
  .intro-lede { font-size: 15px; }
  .intro-meta { margin-top: 32px; padding: 15px 0 0; border-top: 1px solid var(--line-strong); border-left: 0; }
  .summary-item { min-height: 100px; padding: 17px 12px 15px 0; }
  .summary-item + .summary-item { padding-left: 12px; }
  .summary-item strong { font-size: 20px; }
  .workspace-grid { padding-top: 40px; }
  .section-heading { display: block; }
  .section-heading p { margin-top: 8px; }
  .plan-row { grid-template-columns: 25px minmax(0, 1fr); gap: 10px; padding: 17px 0; }
  .lesson-time { grid-column: 2; text-align: left; }
  .lesson-number { display: none; }
  .library-grid { grid-template-columns: 1fr; }
  .heatmap-row { grid-template-columns: 76px minmax(0, 1fr); padding: 14px 0; }
  .heatmap-source { grid-column: 2; text-align: left; }
  .footer { display: block; }
  .footer .text-button { margin-top: 12px; }
  .dialog-actions { display: grid; grid-template-columns: 1fr 1fr; }
}