/* ============================================================
   Pi-Dimension · Web UI kit styles
   Loads the design tokens from ../../colors_and_type.css
   ============================================================ */

@import url('../../colors_and_type.css');

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg-2);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: var(--leading-relaxed);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

button {
  font-family: inherit;
  border: 0;
  background: transparent;
  cursor: pointer;
  color: inherit;
}

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

/* ---------- App shell ---------- */
.pi-app { min-height: 100vh; display: flex; flex-direction: column; }
.pi-main { flex: 1; }

/* ---------- Header ---------- */
.pi-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px clamp(20px, 4vw, 56px);
  background: rgba(250, 251, 252, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}

.pi-brand { display: flex; align-items: center; gap: 10px; }
.pi-brand img { width: 28px; height: 28px; display: block; }
.pi-brand__name { font-weight: 600; color: var(--fg-1); letter-spacing: -0.005em; font-size: 15px; }
.pi-brand__sep  { color: var(--fg-muted); font-family: var(--font-mono); font-size: 13px; }
.pi-brand__sub  { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--fg-3); }

.pi-nav { display: flex; gap: clamp(18px, 3vw, 36px); }
.pi-nav__link { font-size: 14px; color: var(--fg-3); transition: color var(--dur-base) var(--ease-out); }
.pi-nav__link:hover, .pi-nav__link.is-active { color: var(--fg-1); }

.pi-header__right { display: flex; align-items: center; gap: 12px; }

/* ---------- Buttons ---------- */
.pi-btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans);
  font-weight: 500; font-size: 14px; line-height: 1;
  padding: 11px 18px;
  border-radius: var(--r-2);
  border: 1px solid transparent;
  letter-spacing: -0.005em;
  transition: background var(--dur-base) var(--ease-out),
              color      var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              transform  var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.pi-btn:active { transform: translateY(1px); }
.pi-btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

.pi-btn--primary { background: var(--pi-ink-700); color: var(--pi-paper); }
.pi-btn--primary:hover { background: var(--pi-ink-800); }
.pi-btn--primary:active { background: var(--pi-ink-900); }

.pi-btn--ghost { background: transparent; color: var(--fg-1); }
.pi-btn--ghost:hover { background: var(--pi-ink-50); }

.pi-btn--secondary { background: var(--bg-elevated); color: var(--fg-1); border-color: var(--rule-strong); }
.pi-btn--secondary:hover { background: var(--pi-ink-50); border-color: var(--pi-ink-200); }

.pi-btn--sm { font-size: 12.5px; padding: 8px 14px; }

/* ---------- Eyebrow + section heads ---------- */
.pi-eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-3);
}

.pi-section {
  padding: clamp(56px, 8vw, 112px) clamp(20px, 4vw, 56px);
  max-width: var(--frame-max);
  margin: 0 auto;
}
.pi-section--alt { background: var(--bg-sunken); max-width: none; }
.pi-section--alt > * { max-width: var(--frame-max); margin-left: auto; margin-right: auto; }
.pi-section--narrow { max-width: 720px; }

.pi-section__head { margin-bottom: var(--s-7); display: flex; flex-direction: column; gap: 10px; }
.pi-section__title {
  font-family: var(--font-sans);
  font-weight: 600; font-size: var(--step-4); line-height: var(--leading-tight);
  color: var(--fg-1); letter-spacing: var(--tracking-tight);
  margin: 0;
}
.pi-section__lead {
  font-family: var(--font-sans);
  font-size: var(--step-1);
  line-height: var(--leading-relaxed);
  color: var(--fg-3);
  margin: 0; max-width: 56ch;
}

/* ---------- Hero ---------- */
.pi-hero { padding: clamp(48px, 6vw, 88px) clamp(20px, 4vw, 56px) clamp(40px, 6vw, 80px); position: relative; max-width: var(--frame-max); margin: 0 auto; }
.pi-hero__top { display: flex; justify-content: space-between; align-items: baseline; padding-bottom: clamp(36px, 5vw, 64px); border-bottom: 1px solid var(--rule); }
.pi-hero__meta { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--fg-4); }
.pi-hero__inner { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(28px, 4vw, 64px); align-items: start; padding-top: clamp(36px, 5vw, 64px); }
.pi-hero__body { display: flex; flex-direction: column; gap: 22px; }
.pi-hero__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(40px, 5.6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--fg-1);
  margin: 0;
  max-width: 14ch;
  text-wrap: pretty;
}
.pi-hero__title em { font-style: normal; font-weight: 700; color: var(--pi-ink-700); }
.pi-hero__lead {
  font-family: var(--font-sans);
  font-size: var(--step-1);
  line-height: var(--leading-relaxed);
  color: var(--fg-2);
  max-width: 38ch;
  margin: 0;
}
.pi-hero__ctas { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.pi-hero__rule { height: 1px; background: var(--rule); margin: clamp(48px, 6vw, 80px) clamp(20px, 4vw, 56px) 0; }

.pi-hero__feature { display: flex; flex-direction: column; gap: 14px; }
.pi-hero__feature-image {
  position: relative;
  aspect-ratio: 16 / 10;
  background: var(--pi-paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--r-3);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.pi-hero__feature-meta { display: flex; flex-direction: column; gap: 6px; padding: 0 4px; }
.pi-hero__feature-row { display: flex; justify-content: space-between; align-items: baseline; }
.pi-hero__feature-version { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-4); }
.pi-hero__feature-title { font-family: var(--font-sans); font-weight: 600; font-size: var(--step-2); color: var(--fg-1); margin: 4px 0 0; letter-spacing: -0.01em; }
.pi-hero__feature-axiom { font-family: var(--font-serif); font-weight: 500; font-size: var(--step-1); color: var(--fg-2); margin: 0; line-height: 1.5; }

@media (max-width: 880px) {
  .pi-hero__inner { grid-template-columns: 1fr; }
  .pi-hero__top { flex-direction: column; gap: 6px; align-items: flex-start; }
}

/* ---------- Side list (music & drawing) ---------- */
.pi-side-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; }
.pi-side-item {
  display: grid; grid-template-columns: 92px 1fr 90px 24px;
  gap: 20px; align-items: center;
  padding: 22px 8px; border-top: 1px solid var(--rule);
  cursor: pointer; transition: padding-left var(--dur-base) var(--ease-out);
}
.pi-side-item:last-child { border-bottom: 1px solid var(--rule); }
.pi-side-item:hover { padding-left: 16px; }
.pi-side-item:hover .pi-side-item__cta { color: var(--pi-ink-700); transform: translateX(4px); }
.pi-side-item__kind { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--fg-3); }
.pi-side-item__body { display: flex; flex-direction: column; gap: 2px; }
.pi-side-item__title { font-family: var(--font-sans); font-weight: 600; font-size: 16px; color: var(--fg-1); letter-spacing: -0.005em; }
.pi-side-item__note  { font-family: var(--font-sans); font-size: 13.5px; color: var(--fg-3); }
.pi-side-item__year  { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.1em; color: var(--fg-4); text-align: right; }
.pi-side-item__cta   { font-family: var(--font-sans); color: var(--fg-muted); transition: color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out); text-align: right; }

@media (max-width: 640px) {
  .pi-side-item { grid-template-columns: 70px 1fr 24px; }
  .pi-side-item__year { display: none; }
}

/* ---------- Filters / tabs ---------- */
.pi-filters {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg-sunken);
  border: 1px solid var(--rule);
  border-radius: var(--r-pill);
  margin-bottom: var(--s-6);
}
.pi-filter {
  font-family: var(--font-sans); font-size: 12.5px; font-weight: 500;
  padding: 8px 14px; border-radius: var(--r-pill);
  color: var(--fg-3); transition: color var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
}
.pi-filter:hover { color: var(--fg-1); }
.pi-filter.is-active { background: var(--bg-elevated); color: var(--fg-1); box-shadow: 0 1px 0 rgba(17,70,140,.04), 0 1px 2px rgba(17,70,140,.06); }

/* ---------- Grid / tile ---------- */
.pi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2.4vw, 28px); }
@media (max-width: 920px) { .pi-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .pi-grid { grid-template-columns: 1fr; } }

.pi-tile {
  display: flex; flex-direction: column;
  text-align: left; padding: 0;
  background: transparent;
  transition: transform var(--dur-base) var(--ease-out);
}
.pi-tile:hover { transform: translateY(-2px); }
.pi-tile:hover .pi-tile__image { box-shadow: var(--shadow-2); }
.pi-tile__image {
  position: relative;
  background: var(--pi-paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--r-3);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--s-4);
  overflow: hidden;
  transition: box-shadow var(--dur-base) var(--ease-out);
}
.pi-tile__placeholder {
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-muted);
  text-align: center; padding: 12px;
}
.pi-tile__discipline {
  position: absolute; top: 12px; left: 14px;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--fg-3);
  background: rgba(255,255,255,0.84);
  padding: 4px 8px; border-radius: var(--r-1);
}
.pi-tile__meta { display: flex; flex-direction: column; gap: 6px; padding: 0 4px; }
.pi-tile__title { font-family: var(--font-sans); font-weight: 600; font-size: 18px; color: var(--fg-1); margin: 0; letter-spacing: -0.01em; }
.pi-tile__axiom { font-family: var(--font-sans); font-size: 13.5px; color: var(--fg-3); margin: 0; line-height: 1.5; }
.pi-tile__row { display: flex; justify-content: space-between; padding-top: 8px; margin-top: 4px; border-top: 1px solid var(--rule); }
.pi-tile__year, .pi-tile__status { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.1em; color: var(--fg-4); text-transform: uppercase; }

/* ---------- Modal ---------- */
.pi-modal { position: fixed; inset: 0; background: rgba(14,17,23,.32); display: flex; align-items: center; justify-content: center; padding: 24px; z-index: 80; animation: pi-fade var(--dur-base) var(--ease-out); }
.pi-modal__panel {
  background: var(--bg-elevated);
  border-radius: var(--r-4);
  width: min(880px, 100%);
  max-height: 88vh; overflow: auto;
  box-shadow: var(--shadow-3);
  display: grid; grid-template-columns: 1fr 1fr;
  position: relative;
}
@media (max-width: 720px) { .pi-modal__panel { grid-template-columns: 1fr; } }
.pi-modal__close { position: absolute; top: 14px; right: 14px; width: 32px; height: 32px; border-radius: var(--r-2); display: flex; align-items: center; justify-content: center; background: rgba(255,255,255,0.86); }
.pi-modal__close:hover { background: var(--pi-ink-50); }
.pi-modal__close img { width: 16px; height: 16px; }
.pi-modal__image { background: var(--pi-paper-2); display: flex; align-items: center; justify-content: center; min-height: 240px; }
.pi-modal__body { padding: clamp(24px, 3vw, 36px); display: flex; flex-direction: column; gap: 12px; }
.pi-modal__title { font-family: var(--font-sans); font-weight: 600; font-size: var(--step-3); color: var(--fg-1); margin: 0; letter-spacing: -0.01em; }
.pi-modal__axiom { font-family: var(--font-serif); font-weight: 500; font-size: var(--step-1); color: var(--fg-1); margin: 0; line-height: 1.5; }
.pi-modal__body-copy { font-size: 14px; line-height: 1.65; color: var(--fg-2); margin: 0; }
.pi-modal__ctas { display: flex; gap: 10px; margin-top: 12px; }

@keyframes pi-fade { from { opacity: 0; } to { opacity: 1; } }

/* ---------- Notes ---------- */
.pi-notes { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; }
.pi-note {
  display: grid; grid-template-columns: 60px 1fr 24px;
  gap: 24px; align-items: start;
  padding: 28px 0;
  border-top: 1px solid var(--rule);
  cursor: pointer;
  transition: padding-left var(--dur-base) var(--ease-out);
}
.pi-note:last-child { border-bottom: 1px solid var(--rule); }
.pi-note:hover { padding-left: 8px; }
.pi-note:hover .pi-note__cta { color: var(--pi-ink-700); transform: translateX(4px); }
.pi-note__n { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; color: var(--fg-muted); padding-top: 4px; }
.pi-note__body { display: flex; flex-direction: column; gap: 4px; }
.pi-note__date { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-4); }
.pi-note__title { font-family: var(--font-sans); font-weight: 600; font-size: var(--step-2); color: var(--fg-1); margin: 4px 0 6px; letter-spacing: -0.01em; }
.pi-note__excerpt { font-size: 14px; color: var(--fg-3); margin: 0; line-height: 1.6; max-width: 60ch; }
.pi-note__cta { font-family: var(--font-sans); color: var(--fg-muted); padding-top: 4px; transition: color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out); }

/* ---------- Contact / form ---------- */
.pi-contact { display: flex; gap: 12px; align-items: flex-end; }
.pi-contact--sent { display: flex; flex-direction: column; gap: 8px; padding: 24px; border: 1px solid var(--pi-ink-200); background: var(--pi-ink-50); border-radius: var(--r-3); }
.pi-contact__msg { margin: 0; font-size: 14.5px; color: var(--fg-1); }
.pi-field { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.pi-field__label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); }
.pi-input {
  font-family: var(--font-sans); font-size: 14px;
  background: var(--bg-elevated); color: var(--fg-1);
  border: 1px solid var(--rule-strong); border-radius: var(--r-2);
  padding: 10px 12px; height: 42px;
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
  outline: none;
}
.pi-input::placeholder { color: var(--fg-muted); }
.pi-input.is-focused, .pi-input:focus {
  border-color: var(--pi-ink-500);
  box-shadow: var(--shadow-focus);
}

/* ---------- Footer ---------- */
.pi-footer { background: var(--bg); padding: clamp(56px, 8vw, 96px) clamp(20px, 4vw, 56px) 32px; }
.pi-footer__inner { max-width: var(--frame-max); margin: 0 auto; display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: clamp(24px, 4vw, 64px); }
@media (max-width: 720px) { .pi-footer__inner { grid-template-columns: 1fr 1fr; } }
.pi-footer__col { display: flex; flex-direction: column; gap: 10px; }
.pi-footer__mark { width: 36px; height: 36px; }
.pi-footer__sub { font-family: var(--font-sans); font-weight: 600; font-size: 14px; color: var(--fg-1); }
.pi-footer__copy { font-family: var(--font-sans); font-size: 13px; color: var(--fg-3); margin: 0; max-width: 32ch; line-height: 1.6; }
.pi-footer__list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.pi-footer__list a { font-family: var(--font-sans); font-size: 13.5px; color: var(--fg-2); transition: color var(--dur-base) var(--ease-out); }
.pi-footer__list a:hover { color: var(--fg-1); }
.pi-glyphs { display: flex; gap: 14px; font-family: var(--font-math); font-size: 28px; color: var(--fg-1); }
.pi-glyphs span { line-height: 1; }
.pi-footer__rule { height: 1px; background: var(--rule); margin: clamp(40px, 6vw, 64px) auto 18px; max-width: var(--frame-max); }
.pi-footer__bottom { max-width: var(--frame-max); margin: 0 auto; display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-4); }