/* ==========================================================================
   COMMON — landing instrument
   Warm paper, near-black ink, one electric cobalt. No external assets.
   The landing page is deliberately smaller than the full study: one clock,
   one month, one way through to /explore.
   ========================================================================== */

:root {
  --paper: #f5f3ed;
  --ink: #16150f;
  --ink-soft: #3b3931;
  --muted: #625f55;
  --faint: #8b877b;
  --line: rgba(22, 21, 15, 0.16);
  --line-strong: rgba(22, 21, 15, 0.32);
  --cobalt: #244df5;
  --cobalt-wash: rgba(36, 77, 245, 0.065);
  --on-cobalt: #f7f5ef;

  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --max: 1050px;
  --gutter: clamp(20px, 4vw, 40px);
  --header-h: 65px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
}

svg {
  display: block;
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

::selection {
  background: var(--cobalt);
  color: var(--paper);
}

:focus-visible {
  outline: 2px solid var(--cobalt);
  outline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--cobalt);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* --------------------------------------------------------------------------
   Slim header
   -------------------------------------------------------------------------- */

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
}

.brand-word {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.22em;
}

.brand-ratio {
  display: inline-flex;
  align-items: baseline;
  gap: 1px;
  padding: 3px 4px;
  border: 1px solid rgba(36, 77, 245, 0.38);
  border-color: color-mix(in srgb, var(--cobalt) 38%, transparent);
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1;
  letter-spacing: 0.03em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.brand-ratio span {
  opacity: 0.5;
}

.brand:hover .brand-ratio {
  background: var(--cobalt);
  color: var(--paper);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 18px);
  margin-left: auto;
}

.zone-switch {
  display: inline-flex;
  border: 1px solid var(--line-strong);
}

.zone-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.zone-btn + .zone-btn {
  border-left: 1px solid var(--line);
}

.zone-btn:hover:not([aria-pressed="true"]) {
  color: var(--cobalt);
  background: var(--cobalt-wash);
}

.zone-btn[aria-pressed="true"] {
  background: var(--cobalt);
  color: var(--on-cobalt);
}

/* --------------------------------------------------------------------------
   The sun-clock link to /explore
   A sun with eight rays, clock hands, and an outgoing arrow. The 44px target
   stays an ordinary anchor; the tooltip appears on hover and on keyboard
   focus, while the aria-label carries the full pun for screen readers.
   -------------------------------------------------------------------------- */

.sol-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex: none;
  border-radius: 2px;
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: background 0.2s var(--ease);
}

.sol-link:hover,
.sol-link:focus-visible {
  background: var(--cobalt-wash);
}

.sol-icon {
  width: 30px;
  height: 30px;
  overflow: visible;
}

.sol-rays,
.sol-body {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.35;
  stroke-linecap: round;
  transition: stroke 0.2s var(--ease);
}

.sol-body {
  fill: var(--paper);
}

.sol-hand-hour,
.sol-hand-minute {
  stroke: var(--cobalt);
  stroke-width: 1.5;
  stroke-linecap: round;
}

.sol-pin {
  fill: var(--cobalt);
}

.sol-arrow {
  fill: none;
  stroke: var(--cobalt);
  stroke-width: 1.35;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sol-link:hover .sol-rays,
.sol-link:hover .sol-body,
.sol-link:focus-visible .sol-rays,
.sol-link:focus-visible .sol-body {
  stroke: var(--cobalt);
}

.sol-tip {
  position: absolute;
  top: calc(100% + 7px);
  right: 0;
  z-index: 5;
  padding: 6px 8px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.2;
  letter-spacing: 0.05em;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-3px);
  pointer-events: none;
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease),
    visibility 0.18s var(--ease);
}

.sol-tip::before {
  content: "";
  position: absolute;
  right: 18px;
  bottom: 100%;
  border: 4px solid transparent;
  border-bottom-color: var(--ink);
}

.sol-tip-arrow {
  color: var(--on-cobalt);
}

.sol-link:hover .sol-tip,
.sol-link:focus .sol-tip,
.sol-link:focus-visible .sol-tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Main instrument
   -------------------------------------------------------------------------- */

.landing-main {
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
  display: flex;
  align-items: center;
  padding-block: clamp(28px, 5vh, 56px);
}

.landing-main > .wrap {
  width: 100%;
}

.instrument-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(36px, 5vw, 64px);
  align-items: stretch;
}

.clock-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
}

.month-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-left: 1px solid var(--line);
  padding-left: clamp(28px, 4vw, 48px);
}

.panel-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(18px, 3vh, 28px);
}

.panel-kicker {
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.4;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.live-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cobalt);
  flex: none;
}

.month-index {
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  text-align: right;
}

/* --------------------------------------------------------------------------
   Analog dial
   -------------------------------------------------------------------------- */

.clock-stage {
  width: min(100%, 390px);
  aspect-ratio: 1;
  margin-inline: auto;
}

.clock {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* Three tick tiers: quiet units, accented fifths, bold tens. The
   opacities are tuned per theme so every tier clears the legibility
   floor; the light theme needs stronger ink than the dark. */
:root {
  --tick-minor-o: 0.45;
  --tick-medium-o: 0.62;
  --tick-major-o: 0.8;
}

html[data-theme="dark"] {
  --tick-minor-o: 0.35;
  --tick-medium-o: 0.5;
  --tick-major-o: 0.75;
}

.dial-ring {
  fill: none;
  stroke: var(--ink);
  stroke-opacity: 0.4;
  stroke-width: 1.2;
}

.tick-minor {
  stroke: var(--ink);
  stroke-opacity: var(--tick-minor-o);
  stroke-width: 1.1;
}

.tick-medium {
  stroke: var(--ink);
  stroke-opacity: var(--tick-medium-o);
  stroke-width: 1.5;
}

.tick-major {
  stroke: var(--ink);
  stroke-opacity: var(--tick-major-o);
  stroke-width: 2.1;
}

/* Watch-style numerals: one digit per decile, shared by every hand. */
.dial-label {
  fill: var(--ink);
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-anchor: middle;
  dominant-baseline: middle;
}

.hand line {
  stroke-linecap: round;
}

.hand-hour line {
  stroke: var(--ink);
  stroke-width: 6;
}

.hand-ones line {
  stroke: var(--ink);
  stroke-width: 3.4;
}

.hand-minute line {
  stroke: var(--cobalt);
  stroke-width: 2;
}

/* A lighter, dashed outline distinguishes the optional fourth digit without
   taking the solid cobalt units hand's visual role. SVG needs explicit hiding. */
.hand-fine[hidden] {
  display: none;
}

.hand-fine line {
  stroke: var(--ink-soft);
  stroke-width: 1.2;
  stroke-dasharray: 3 4;
}

.pin-outer {
  fill: var(--ink);
}

.pin-inner {
  fill: var(--paper);
}

.pin-dot {
  fill: var(--cobalt);
}

/* --------------------------------------------------------------------------
   Digital readout
   -------------------------------------------------------------------------- */

.digital {
  width: 100%;
  margin-top: clamp(10px, 2vh, 18px);
  padding-top: clamp(12px, 2vh, 18px);
  border-top: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  justify-content: center;
  font-family: var(--mono);
  font-size: clamp(40px, 4.4vw, 56px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.measure-label {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
}

.digital .field {
  min-width: 2ch;
  text-align: center;
}

.digital .colon {
  margin: 0 0.06em;
  color: var(--faint);
  font-size: 0.66em;
  transform: translateY(-0.1em);
}

.clock-meta {
  width: 100%;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px 16px;
  flex-wrap: wrap;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.clock-meta p {
  margin: 0;
}

.ordinary {
  color: var(--ink-soft);
}

.meta-label {
  color: var(--faint);
}

.zone {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.meta-sep {
  color: var(--faint);
}

.clock-note {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.4;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  text-align: center;
}

/* Link to the dial explanation on /explore, right under the readout. */
.dial-help {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
}

.dial-help a {
  color: var(--ink-soft);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
  transition: color 0.15s var(--ease);
}

.dial-help a:hover,
.dial-help a:focus-visible {
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   Current month
   -------------------------------------------------------------------------- */

.month-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.month-name {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 4.4vw, 54px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.month-year {
  flex: none;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.today-line {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.35;
  color: var(--ink-soft);
}

.today-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cobalt);
  flex: none;
}

.today-line.is-special {
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.month-table {
  width: 100%;
  margin-top: clamp(14px, 2.4vh, 22px);
  border-collapse: separate;
  border-spacing: 3px;
  table-layout: fixed;
}

.month-table th {
  padding: 0 0 7px;
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  text-align: center;
}

.month-table th abbr {
  text-decoration: none;
}

.month-table td {
  padding: 0;
  text-align: center;
  vertical-align: middle;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1;
  color: var(--ink-soft);
  border-radius: 1px;
}

.month-table td time {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(38px, 4.6vh, 50px);
}

.month-table td.is-today {
  background: var(--cobalt);
  color: var(--on-cobalt);
}

.outside-note {
  margin-top: 14px;
  padding: 10px 12px;
  border-left: 2px solid var(--cobalt);
  background: var(--cobalt-wash);
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.month-foot {
  display: flex;
  align-items: baseline;
  justify-content: flex-start;
  gap: 10px 20px;
  flex-wrap: wrap;
  margin-top: clamp(16px, 2.4vh, 22px);
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.gregorian {
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   Small screens: stack the instrument, keep the dial and grid full-width
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {
  .instrument-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .month-panel {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 36px;
    max-width: 560px;
    width: 100%;
    margin-inline: auto;
  }

  .clock-panel {
    max-width: 560px;
    width: 100%;
    margin-inline: auto;
  }

  .landing-main {
    align-items: flex-start;
    min-height: 0;
    padding-block: 34px 48px;
  }

  .month-name {
    font-size: 46px;
  }
}

@media (max-width: 600px) {
  .header-inner {
    min-height: 60px;
  }

  .brand-word {
    font-size: 11px;
  }

  .brand-ratio {
    font-size: 7px;
  }

  .zone-btn {
    padding: 6px 8px;
    font-size: 8px;
  }

  .panel-head {
    padding-bottom: 10px;
    margin-bottom: 20px;
  }

  .month-name {
    font-size: 42px;
  }

  .month-table td time {
    min-height: 42px;
  }
}

@media (max-width: 360px) {
  .clock-meta {
    font-size: 9px;
  }
}

/* --------------------------------------------------------------------------
   Reduced motion: damp transitions. The optional fine hand steps between
   its 100 tick positions; the extra digital precision stays available.
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}