/* Hallmark · macrostructure: Marquee Hero · theme: custom "Maroon Vacuum" (brand: UP maroon + IoP teal)
 * nav: retracting masthead (N12) · footer: statement + directory (Ft5) · enrichment: φ particle field (canvas, Tier A)
 * motion: io-reveal stagger · φ-canvas spring field · hover micro-lifts
 * states: default · hover · focus-visible · active · disabled
 * Hallmark · pre-emit critique: P4 H4 E4 S5 R4 V4
 * Fonts: Optima (display) + Avenir (body) — the UPLB institutional pairing, self-hosted woff
 * UP VIG colors: maroon #8A1538 · green #00573F · gold #FFB81C (light theme uses them verbatim)
 */

/* ---------- institutional fonts (self-hosted, from the IoP dev site) ---------- */
@font-face { font-family: "Optima"; src: url("fonts/Optima-Regular.woff") format("woff"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Optima"; src: url("fonts/Optima-Medium.woff") format("woff"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Optima"; src: url("fonts/Optima-Demi.woff") format("woff"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Avenir"; src: url("fonts/Avenir-Roman.woff") format("woff"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Avenir"; src: url("fonts/Avenir-Medium.woff") format("woff"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Avenir"; src: url("fonts/Avenir-Heavy.woff") format("woff"); font-weight: 700; font-display: swap; }

/* ---------- tokens ---------- */
:root {
  --font-display: "Optima", "Optima UPLB", "Trebuchet MS", "Segoe UI", sans-serif;
  --font-body: "Avenir", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-mono: "Avenir", "Avenir Next", system-ui, sans-serif;

  --step--1: clamp(0.78rem, 0.74rem + 0.2vw, 0.85rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.06rem);
  --step-1: clamp(1.15rem, 1.05rem + 0.5vw, 1.35rem);
  --step-2: clamp(1.55rem, 1.3rem + 1.2vw, 2.1rem);
  --step-3: clamp(2rem, 1.5rem + 2.5vw, 3.1rem);
  --step-4: clamp(2.7rem, 1.8rem + 4.5vw, 5.4rem);

  --space-2xs: 0.44rem;
  --space-xs: 0.7rem;
  --space-s: 1.1rem;
  --space-m: 1.8rem;
  --space-l: 2.9rem;
  --space-xl: 4.6rem;
  --space-2xl: 7rem;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-1: 160ms;
  --dur-2: 320ms;
  --dur-3: 700ms;

  --radius: 14px;
  --radius-lg: 22px;
  --masthead-h: 64px;
  --measure: 62ch;
  --content: 1180px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: oklch(0.16 0.014 20);
  --bg-raised: oklch(0.205 0.017 20);
  --bg-glass: oklch(0.19 0.016 20 / 0.78);
  --ink: oklch(0.93 0.012 30);
  --ink-muted: oklch(0.74 0.016 30);
  --teal: oklch(0.8 0.1 184);
  --teal-ink: oklch(0.17 0.02 190);
  --maroon: oklch(0.72 0.1 22);
  --gold: oklch(0.82 0.12 85);
  --line: oklch(0.93 0.012 30 / 0.13);
  --line-strong: oklch(0.93 0.012 30 / 0.24);
  --shadow: 0 18px 44px oklch(0 0 0 / 0.42);
  --glow: 0 0 24px oklch(0.8 0.1 184 / 0.16);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: oklch(0.972 0.009 85);
  --bg-raised: oklch(1 0 0);
  --bg-glass: oklch(0.972 0.009 85 / 0.82);
  --ink: oklch(0.25 0.03 25);
  --ink-muted: oklch(0.44 0.024 25);
  --teal: oklch(0.55 0.085 184);
  --teal-ink: oklch(0.98 0.006 90);
  --maroon: #8A1538;
  --gold: #FFB81C;
  --line: oklch(0.25 0.03 25 / 0.14);
  --line-strong: oklch(0.25 0.03 25 / 0.26);
  --shadow: 0 16px 40px oklch(0.25 0.03 25 / 0.12);
  --glow: 0 0 24px oklch(0.55 0.085 184 / 0.14);
}

/* ---------- reset-lite ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--dur-2) ease, color var(--dur-2) ease;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; font-style: normal; line-height: 1.08; margin: 0; text-wrap: balance; }
p { margin: 0; }
a { color: inherit; }
img, svg, canvas { display: block; max-width: 100%; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
::selection { background: var(--teal); color: var(--teal-ink); }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed; top: -100%; left: var(--space-s); z-index: 200;
  padding: 0.6em 1em; background: var(--teal); color: var(--teal-ink);
  border-radius: 8px; font-weight: 600; text-decoration: none;
  transition: top var(--dur-1) ease;
}
.skip-link:focus-visible { top: var(--space-s); }

/* ---------- grain ---------- */
.grain {
  position: fixed; inset: 0; z-index: 90; pointer-events: none; opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.5' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 150px 150px;
}

/* ---------- loader ---------- */
.loader {
  position: fixed; inset: 0; z-index: 120;
  display: grid; place-items: center;
  background: var(--bg);
  transition: opacity 480ms ease, visibility 0s 480ms;
}
.loader-mark { width: 84px; height: auto; animation: loader-pop 640ms var(--ease-out) both; }
@keyframes loader-pop { from { opacity: 0; transform: scale(0.88); } to { opacity: 1; transform: none; } }
.loader.is-done { opacity: 0; visibility: hidden; }

/* ---------- masthead ---------- */
.masthead {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--masthead-h);
  display: flex; align-items: center; gap: var(--space-s);
  padding-inline: clamp(1rem, 4vw, 2.2rem);
  transform: translateY(0);
  transition: transform var(--dur-2) var(--ease-out), background-color var(--dur-2) ease, border-color var(--dur-2) ease;
  border-bottom: 1px solid transparent;
}
.masthead.is-scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.masthead.is-hidden { transform: translateY(-102%); }

.brand {
  display: flex; align-items: center; gap: 0.7rem;
  text-decoration: none; margin-right: auto;
  color: var(--teal);
  position: relative;
}
.brand-mark { width: 40px; height: auto; transition: transform var(--dur-2) var(--ease-spring); }
.brand:hover .brand-mark, .brand:focus-visible .brand-mark { transform: rotate(90deg); }
.brand-progress {
  position: absolute; top: 50%; left: 0;
  width: 40px; height: 40px;
  transform: translateY(-50%) rotate(-90deg);
  pointer-events: none;
}
.brand-progress .phi-orbit {
  fill: none; stroke: var(--teal); stroke-width: 3.4; stroke-linecap: round;
  stroke-dasharray: 107; stroke-dashoffset: 107; opacity: 0.85;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-inst { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; color: var(--ink); }
.brand-sub { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-muted); }

.nav-list { display: flex; align-items: center; gap: clamp(0.4rem, 1.6vw, 1.1rem); }
.nav-list a:not(.btn) {
  text-decoration: none; font-weight: 500; font-size: var(--step--1);
  padding: 0.45em 0.65em; border-radius: 8px;
  background-image: linear-gradient(var(--teal), var(--teal));
  background-repeat: no-repeat; background-size: 0% 2px; background-position: 0 100%;
  transition: background-size var(--dur-2) var(--ease-out), color var(--dur-1) ease;
  white-space: nowrap;
}
.nav-list a:not(.btn):hover { background-size: 100% 2px; }
.nav-toggle { display: none; }

.theme-toggle {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--line-strong);
  transition: transform var(--dur-2) var(--ease-spring), border-color var(--dur-1) ease;
}
.theme-toggle:hover { transform: scale(1.08); border-color: var(--teal); }
.theme-toggle svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
html[data-theme="dark"] .ico-sun { display: none; }
html[data-theme="light"] .ico-moon { display: none; }

/* ---------- buttons (8-state discipline) ---------- */
.btn {
  display: inline-block;
  font-weight: 600; font-size: var(--step--1);
  text-decoration: none; text-align: center; white-space: nowrap;
  padding: 0.85em 1.5em; border-radius: 999px;
  border: 1px solid transparent;
  transition: transform var(--dur-2) var(--ease-spring), box-shadow var(--dur-2) ease,
              background-color var(--dur-1) ease, color var(--dur-1) ease, border-color var(--dur-1) ease;
}
.btn-primary { background: var(--teal); color: var(--teal-ink); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--glow), var(--shadow); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); transform: translateY(-2px); }
.btn:active, .btn.is-active { transform: translateY(0); }
.btn-sm { padding: 0.6em 1.1em; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }
.btn.is-focus, .btn.is-hover { /* forced-state hooks for demos */ }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: max(100svh, 560px);
  display: grid; align-items: center;
  padding: calc(var(--masthead-h) + var(--space-l)) var(--space-m) var(--space-xl);
  overflow: clip;
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }
.hero-inner { position: relative; z-index: 1; max-width: var(--content); margin-inline: auto; width: 100%; }
.hero-title {
  font-size: var(--step-4);
  letter-spacing: -0.015em;
  margin-bottom: var(--space-m);
}
.hero-sub {
  max-width: 46ch;
  font-size: var(--step-1);
  color: var(--ink-muted);
  margin-bottom: var(--space-l);
}
.hero-ctas { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.hero-scrollcue {
  position: absolute; bottom: var(--space-m); left: 50%; transform: translateX(-50%);
  z-index: 1; display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  color: var(--ink-muted); font-family: var(--font-mono); font-size: 0.62rem;
  letter-spacing: 0.22em; text-transform: uppercase;
}
.hero-scrollcue i { width: 1px; height: 42px; background: linear-gradient(var(--teal), transparent); }

/* ---------- sections ---------- */
.section {
  max-width: var(--content);
  margin-inline: auto;
  padding: var(--space-2xl) var(--space-m);
}
.section-head { max-width: 60ch; margin-bottom: var(--space-l); }
.section-head h2 { font-size: var(--step-3); margin-bottom: var(--space-2xs); }
.section-head-row {
  max-width: none;
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-s);
}
.section-note { font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-muted); }
.lede { font-size: var(--step-1); color: var(--ink-muted); max-width: 58ch; }
.text-link {
  display: inline-block; font-weight: 700; font-size: var(--step--1);
  color: var(--teal); text-decoration: none;
  background-image: linear-gradient(var(--teal), var(--teal));
  background-repeat: no-repeat; background-size: 0% 2px; background-position: 0 100%;
  transition: background-size var(--dur-2) var(--ease-out);
}
.text-link:hover, .text-link:focus-visible { background-size: 100% 2px; }
.section-alt {
  max-width: none;
  border-block: 1px solid var(--line);
  background: var(--bg-raised);
}

/* ---------- about ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--space-l);
  align-items: start;
}
.about-text h2 { font-size: var(--step-3); margin-bottom: var(--space-2xs); }
.about-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.about-media img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; display: block; }
.vision-mission {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-m);
  margin-top: var(--space-m);
}
.vm h3 { font-size: var(--step-1); color: var(--teal); margin-bottom: var(--space-2xs); }
.plo-list { display: flex; flex-direction: column; gap: 0.55rem; padding-left: 1.1rem; }
.plo-list li { position: relative; padding-left: 0.4rem; color: var(--ink-muted); font-size: var(--step--1); line-height: 1.6; }
.plo-list li::before {
  content: ""; position: absolute; left: -1.1rem; top: 0.66em;
  width: 0.55rem; height: 2px; background: var(--teal);
}

/* ---------- academics ---------- */
.academics-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: var(--space-l);
  align-items: start;
}
.academics-block h3 { font-size: var(--step-2); margin-bottom: var(--space-2xs); }
.academics-intro { color: var(--ink-muted); margin-bottom: var(--space-2xs); }
.academics-block .plo-list { margin-bottom: var(--space-s); }

/* ---------- administration ---------- */
.subsection-h { font-size: var(--step-1); font-weight: 500; color: var(--ink-muted); margin-bottom: var(--space-s); }
.admin-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-s);
  margin-bottom: var(--space-m);
}
.person { margin: 0; }
.person img {
  width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover;
  border-radius: var(--radius); border: 1px solid var(--line); display: block;
  transition: transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2) ease;
}
.person:hover img { transform: translateY(-4px); box-shadow: var(--shadow); }
.person-name { margin-top: 0.5rem; font-weight: 500; font-size: var(--step--1); }

/* ---------- cards ---------- */
.card {
  display: flex; flex-direction: column; gap: 0.55rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-m);
  text-decoration: none;
  min-width: 0;
  transition: transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2) ease, border-color var(--dur-2) ease;
}
a.card:hover, a.card:focus-visible { transform: translateY(-5px); border-color: var(--teal); box-shadow: var(--shadow); }
.card-meta { color: var(--ink-muted); font-size: var(--step--1); }
.card-title { font-family: var(--font-display); font-weight: 600; font-size: var(--step-2); line-height: 1.15; overflow-wrap: anywhere; }
.card-body { color: var(--ink-muted); font-size: var(--step--1); line-height: 1.65; }
.card-link { margin-top: auto; padding-top: var(--space-2xs); font-weight: 600; font-size: var(--step--1); color: var(--teal); }

/* ---------- cluster row ---------- */
.cluster-row {
  display: grid; grid-auto-flow: column;
  grid-auto-columns: clamp(250px, 26vw, 340px);
  gap: var(--space-s);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 2px 2px var(--space-s);
  margin-inline: calc(-1 * var(--space-m));
  padding-inline: var(--space-m);
  scrollbar-width: thin;
  scrollbar-color: var(--teal) transparent;
}
.cluster { scroll-snap-align: start; }
.cluster .card-title { font-size: var(--step-1); }

/* ---------- news ---------- */
.news-card { max-width: 72ch; }
.news-card .card-body { font-size: var(--step-0); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); background: var(--bg-raised); }
.footer-grid {
  max-width: var(--content); margin-inline: auto;
  padding: var(--space-xl) var(--space-m) var(--space-l);
  display: grid; gap: var(--space-l);
  grid-template-columns: 1.4fr 1fr 0.6fr;
}
.footer-lockup { width: min(340px, 100%); height: auto; margin-bottom: var(--space-2xs); }
.footer-title { font-size: var(--step-2); margin-bottom: var(--space-2xs); }
.footer-line { color: var(--ink-muted); font-size: var(--step--1); }
.footer-tag {
  margin-top: var(--space-2xs);
  font-weight: 700; font-size: 0.72rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--maroon);
}
.footer-h { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold); margin: 0 0 var(--space-2xs); }
.footer-list { display: flex; flex-direction: column; gap: 0.7rem; }
.footer-list a { font-weight: 500; font-size: var(--step--1); text-decoration: none; background-image: linear-gradient(var(--teal), var(--teal)); background-repeat: no-repeat; background-size: 0% 1px; background-position: 0 100%; transition: background-size var(--dur-2) var(--ease-out); overflow-wrap: anywhere; }
.footer-list a:hover { background-size: 100% 1px; }
.footer-list span { display: block; font-size: 0.68rem; color: var(--ink-muted); }
.footer-fine {
  max-width: var(--content); margin-inline: auto;
  padding: var(--space-m) var(--space-m) var(--space-l);
  font-family: var(--font-mono); font-size: 0.66rem; color: var(--ink-muted);
  border-top: 1px solid var(--line);
}

/* ---------- reveal choreography (JS-gated, motion-safe) ---------- */
@media (prefers-reduced-motion: no-preference) {
  html.js [data-rv] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
    transition-delay: var(--rv-d, 0ms);
  }
  html.js [data-rv].in { opacity: 1; transform: none; }
  html.js .hero-scrollcue i { animation: cue 2.2s ease-in-out infinite; }
  @keyframes cue { 0%, 100% { transform: scaleY(0.4); transform-origin: top; } 50% { transform: scaleY(1); transform-origin: top; } }
}

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .about-grid, .academics-grid { grid-template-columns: minmax(0, 1fr); }
  .about-media img { aspect-ratio: 16 / 9; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 767px) {
  :root { --masthead-h: 58px; }
  .vision-mission { grid-template-columns: minmax(0, 1fr); }
  .section-head-row { flex-direction: column; gap: 0; }
  .admin-grid { grid-template-columns: minmax(0, 1fr); }
  .person img { aspect-ratio: 16 / 9; object-position: center 22%; }
  .hero { padding-inline: var(--space-s); }
  .section { padding-inline: var(--space-s); }
  .cluster-row { margin-inline: calc(-1 * var(--space-s)); padding-inline: var(--space-s); grid-auto-columns: 82vw; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-m); }

  .nav-toggle {
    display: inline-flex; align-items: center; gap: 0.5em;
    font-weight: 600; font-size: var(--step--1);
    padding: 0.5em 0.9em; border: 1px solid var(--line-strong); border-radius: 999px;
  }
  .nav-toggle[aria-expanded="true"] { border-color: var(--teal); color: var(--teal); }
  .nav-list {
    position: fixed; top: var(--masthead-h); left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg-glass); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    padding: var(--space-2xs) var(--space-s) var(--space-s);
    visibility: hidden; opacity: 0; transform: translateY(-8px);
    transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out), visibility 0s var(--dur-2);
  }
  .masthead.nav-open .nav-list { visibility: visible; opacity: 1; transform: none; transition-delay: 0s; }
  .nav-list li { border-bottom: 1px solid var(--line); }
  .nav-list li:last-child { border-bottom: 0; padding-top: var(--space-2xs); }
  .nav-list a { display: block; padding: 0.8em 0.4em; font-size: var(--step-0); }
  .nav-cta-item { display: none; }
  .brand-sub { display: none; }
}
@media (min-width: 768px) {
  .nav-toggle { display: none; }
}
@media (max-width: 374px) {
  .hero-ctas .btn { width: 100%; }
  .brand-inst { font-size: 0.9rem; }
}

/* ---------- reduced motion: everything static, nothing hidden ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .loader { display: none; }
  html.js [data-rv] { opacity: 1; transform: none; }
  .hero-canvas { display: none; }
}