/* Shared stylesheet for math_study HTML pages — Rollerball-inspired palette. */

:root {
  --bg: #0b0c10;
  --surface: #101319;
  --surface-alt: #0d1118;
  --panel: #0a0d12;
  --card-bg: #0c0f14;
  --text: #f5f5f7;
  --muted: #c0c0c0;
  --accent: #ff5500;
  --accent-soft: #ffd5bf;
  --green: #48ff6b;
  --border: #c0c0c0;
  --font-display: "Orbitron", sans-serif;
  --font-mono: "Share Tech Mono", monospace;
  --font-body: "Inter", sans-serif;
}

/* Light mode — same rollerball structure, flipped to a paper-and-ink palette.
   Explicit opt-in only via [data-theme="light"]; default (no attribute) stays dark. */
:root[data-theme="light"] {
  --bg: #f2f1ee;
  --surface: #ffffff;
  --surface-alt: #eceae6;
  --panel: #f8f7f4;
  --card-bg: #ffffff;
  --text: #16171a;
  --muted: #52545a;
  --accent: #c2400c;
  --accent-soft: #8a3410;
  --green: #1f8a4c;
  --border: #cac9c4;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

html { color-scheme: dark; }
html[data-theme="light"] { color-scheme: light; }

body,
.site-header,
.hero,
.card,
.tag-card,
.board,
.countdown-panel,
.clock-core,
.doc-hero,
.phase-status,
.source-note,
code,
pre {
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

body {
  background-image:
    linear-gradient(rgba(192, 192, 192, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(192, 192, 192, 0.05) 1px, transparent 1px);
  background-size: 34px 34px;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(1.25rem, 4vw, 3rem) 1.25rem 4rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--text); text-shadow: 0 0 8px rgba(255, 85, 0, 0.4); }

h1, h2, h3 {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 1.6em 0 0.6em;
}

h1 { margin-top: 0; }

p { line-height: 1.6; color: var(--text); }

ul, ol { line-height: 1.6; color: var(--text); }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

blockquote {
  border-left: 3px solid var(--accent);
  margin: 1rem 0;
  padding: 0.4rem 0 0.4rem 1rem;
  color: var(--muted);
  background: var(--card-bg);
}

code {
  font-family: var(--font-mono);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 0.02rem 0.35rem;
  color: var(--accent-soft);
  font-size: 0.88em;
}

pre {
  font-family: var(--font-mono);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 0.85rem 1rem;
  overflow-x: auto;
  color: var(--text);
}
pre code { border: none; background: none; padding: 0; color: var(--text); }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
  font-size: 0.92rem;
  overflow-x: auto;
  display: block;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--card-bg);
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.2rem 0.55rem;
  background: var(--card-bg);
}

/* ---- Site header / breadcrumb nav ---- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  padding: 0.85rem 1.25rem;
}

.site-header nav {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header .brand {
  font-family: var(--font-display);
  color: var(--accent);
  letter-spacing: 0.1em;
  font-size: 0.95rem;
  text-transform: uppercase;
  margin-right: 0.6rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  align-items: center;
}

.site-header a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-header a:hover,
.site-header a.is-active {
  color: var(--accent);
  text-shadow: none;
}

.theme-toggle,
.nav-toggle {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}

.theme-toggle:hover,
.nav-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.nav-toggle { display: none; }

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }

  .nav-links {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border);
  }

  .nav-links.is-open { display: flex; }

  .nav-links a { padding: 0.2rem 0; }

  .theme-toggle { margin-left: 0; }
}

/* ---- Hero / masthead (index page) ---- */

.hero {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: clamp(1.25rem, 3vw, 2.25rem);
  margin-top: 1rem;
}

.lockup {
  display: inline-block;
  border: 2px solid var(--border);
  padding: 0.75rem 1rem;
  margin: 0.9rem 0 0.8rem;
  background: var(--card-bg);
}

.masthead {
  margin: 0;
  color: var(--accent);
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 0.95;
}

.subline {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: clamp(0.55rem, 1.3vw, 0.82rem);
}

.lede {
  max-width: 68ch;
  color: var(--muted);
}

.stat-line {
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--accent);
}

.source-note {
  margin-top: 1.1rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 0.75rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
}
.source-note a { color: var(--accent); }

/* ---- Progress board ---- */

.board {
  margin-top: 1.1rem;
  border: 1px solid var(--border);
  background: var(--panel);
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
}

.board-col {
  border-right: 1px solid var(--border);
  padding: 0.75rem 0.6rem;
  text-align: center;
}
.board-col:last-child { border-right: 0; }

.board-phase {
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.board-name {
  margin: 0.3rem 0 0.5rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: none;
  font-family: var(--font-body);
  font-weight: 600;
  min-height: 2.6em;
}

.board-score {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.5rem;
}

.board-status {
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.board-col.is-current .board-phase { color: var(--accent); }
.board-col.is-current { background: rgba(255, 85, 0, 0.08); }

@media (max-width: 720px) {
  .board { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .board-col { border-bottom: 1px solid var(--border); }
}

/* ---- Sections / cards ---- */

section { margin-top: 2.75rem; }

.section-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.1rem 1.2rem;
  grid-column: span 12;
}

@media (min-width: 720px) {
  .card.span-6 { grid-column: span 6; }
  .card.span-4 { grid-column: span 4; }
}

.card h3 {
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--text);
  margin: 0 0 0.5rem;
}

.card .path {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 0.6rem;
  word-break: break-all;
}

a.path { cursor: pointer; }

.card p { color: var(--muted); font-size: 0.92rem; margin: 0 0 0.55rem; }
.card p:last-child { margin-bottom: 0; }
.card p strong { color: var(--text); font-weight: 600; }

.card .use-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-top: 0.7rem;
  margin-bottom: 0.2rem;
}

/* ---- Procedure list ---- */

.procedure {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  gap: 0.7rem;
}

.procedure li {
  counter-increment: step;
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 0.85rem 1rem 0.85rem 3.2rem;
  position: relative;
  font-size: 0.92rem;
  color: var(--text);
}

.procedure li::before {
  content: counter(step);
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.15rem;
  line-height: 1;
}

/* ---- Topic tags ---- */

.tag-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag-card {
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--muted);
  flex: 1 1 260px;
}

.tag-card strong {
  display: block;
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 0.25rem;
  letter-spacing: 0;
}

.out-of-scope {
  margin-top: 1rem;
  border: 1px dashed var(--border);
  padding: 0.7rem 0.9rem;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---- Countdown clock (deadline reminder) ---- */

.countdown-panel {
  margin-top: 1.1rem;
  border: 1px solid var(--border);
  background: var(--panel);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

@media (max-width: 640px) {
  .countdown-panel { grid-template-columns: 1fr; }
}

.clock-core {
  position: relative;
  padding: 0.85rem 1rem;
  text-align: center;
  border-right: 1px solid var(--border);
  background: var(--surface-alt);
}
.countdown-panel .clock-core:last-child { border-right: 0; }

.clock-label {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.68rem;
}

.clock-target {
  margin: 0.15rem 0 0;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--text);
  min-height: 1.2em;
}

.clock-time {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  color: var(--text);
  letter-spacing: 0.08em;
  font-size: clamp(1.5rem, 4.2vw, 2.2rem);
  line-height: 1;
  animation: rollerball-clock-tick 1s steps(1, end) infinite;
}

.clock-time .unit {
  font-family: var(--font-mono);
  font-size: 0.42em;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-right: 0.6em;
}
.clock-time .unit:last-child { margin-right: 0; }

.clock-time.is-overdue { color: var(--accent); }

.clock-core::after {
  content: "LIVE";
  position: absolute;
  top: 0.4rem;
  right: 0.5rem;
  border: 1px solid var(--accent);
  padding: 0.06rem 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  animation: rollerball-live-blink 1s steps(2, end) infinite;
}

.clock-core.is-complete::after {
  content: "CLEAR";
  color: var(--green);
  border-color: var(--green);
  animation: none;
}

.clock-core.is-complete .clock-time {
  color: var(--green);
  animation: none;
}

.clock-note {
  margin: 0.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: center;
}
.clock-note a { color: var(--accent); }

@keyframes rollerball-clock-tick {
  0% { text-shadow: 0 0 0 rgba(255, 85, 0, 0); transform: translateY(0); }
  50% { text-shadow: 0 0 8px rgba(255, 85, 0, 0.45); transform: translateY(-1px); }
  100% { text-shadow: 0 0 0 rgba(255, 85, 0, 0); transform: translateY(0); }
}

@keyframes rollerball-live-blink {
  0% { opacity: 0.35; }
  50% { opacity: 1; }
  100% { opacity: 0.35; }
}

@media (prefers-reduced-motion: reduce) {
  .clock-time, .clock-core::after { animation: none; }
}

/* ---- Plan page: phase status panel ---- */

.phase-status {
  margin-top: 1rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 0.7rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}
.phase-status strong { color: var(--accent); font-family: var(--font-body); }

.progress-track {
  margin-top: 0.4rem;
  height: 8px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.25s ease;
}

.sync-status {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
}

.sync-indicator.is-error { color: var(--accent); }

.sync-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 0.25rem 0.55rem;
  cursor: pointer;
}
.sync-btn:hover { color: var(--accent); border-color: var(--accent); }

.settings-form {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.25rem 1.5rem;
  max-width: 28rem;
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.settings-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.settings-field label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
}

.settings-field input[type="number"] {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 0.4rem 0.55rem;
  width: 100%;
  max-width: 10rem;
}

.settings-field input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
}

.settings-hint {
  color: var(--muted);
  font-size: 0.82rem;
}

.settings-actions {
  display: flex;
  gap: 0.6rem;
}

.plan-end-date {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}

/* ---- Document page shell ---- */

.doc-hero {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.25rem 1.5rem;
  margin-top: 1rem;
}

.doc-hero h1 { margin: 0.3rem 0 0; color: var(--accent); }

.doc-body {
  margin-top: 2rem;
}

.doc-body h1 { display: none; } /* title already shown in doc-hero */

.doc-body input[type="checkbox"] {
  accent-color: var(--accent);
  margin-right: 0.4rem;
}

.doc-body li:has(input[type="checkbox"]) { list-style: none; }
.doc-body ul:has(li input[type="checkbox"]) { padding-left: 0.5rem; }

.crumb-strip {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.crumb-strip a { color: var(--accent); }

/* ---- Wall planner (planner.html) ---- */

.planner-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1.2rem;
}

.planner-nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.planner-nav button,
.planner-view-select {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}
.planner-nav button:hover { color: var(--accent); border-color: var(--accent); }

.planner-heading {
  font-family: var(--font-display);
  color: var(--accent);
  letter-spacing: 0.08em;
  font-size: 1.1rem;
  margin: 0;
  text-transform: uppercase;
  text-align: center;
}

.planner-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
}

.planner-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.planner-day {
  background: var(--card-bg);
  min-height: 84px;
  padding: 0.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  overflow: hidden;
}

.planner-day.is-empty { background: transparent; }
.planner-day.is-past { opacity: 0.4; }
.planner-day.is-today { outline: 2px solid var(--accent); outline-offset: -2px; }

.planner-day .date-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
}

.planner-chip {
  display: block;
  min-width: 0;
  font-size: 0.66rem;
  padding: 0.1rem 0.3rem;
  border-left: 3px solid;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.12s ease, filter 0.12s ease;
}

.planner-chip:hover,
.planner-chip:focus-visible {
  filter: brightness(1.25);
  text-decoration: underline;
}

.planner-dots { display: flex; gap: 0.2rem; flex-wrap: wrap; }
.planner-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
  flex: none;
}

.planner-grid.is-compact .planner-day { min-height: 22px; padding: 0.1rem; }
.planner-grid.is-compact .date-num { font-size: 0.55rem; }

.planner-year-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin-top: 1rem;
}

.planner-mini-month { border: 1px solid var(--border); background: var(--panel); padding: 0.6rem; }
.planner-mini-label {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
}

.planner-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  margin-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}
.planner-legend-item { display: flex; align-items: center; gap: 0.4rem; }
.planner-legend-swatch { width: 10px; height: 10px; display: inline-block; flex: none; }

.planner-completed ul,
#planner-completed-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: grid;
  gap: 0.35rem;
}
#planner-completed-list li { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--muted); }
.planner-empty { color: var(--muted); font-size: 0.85rem; }

/* ---- Footer ---- */

footer {
  margin-top: 3rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.swatch-row { display: flex; gap: 0.35rem; align-items: center; }
.swatch {
  width: 14px;
  height: 14px;
  border: 1px solid var(--border);
  display: inline-block;
}