/* ==========================================================================
   AI Literacy For All — AI Literacy Workshops
   Design language: Japandi (Japanese minimalism × Scandinavian warmth)
   Palette, type, and spacing tokens live here. Edit values in :root to retheme.
   ========================================================================== */

:root {
  /* Color — warm, muted, earthy. No pure black / pure white. */
  --paper:      #EDE8DF;  /* warm oat background */
  --paper-2:    #E4DDD0;  /* slightly deeper panel */
  --ink:        #2A2724;  /* sumi-ink text (not pure black) */
  --ink-soft:   #5A544C;  /* secondary text */
  --sage:       #8A9A82;  /* muted sage — the tech-leaning-but-natural accent */
  --sage-deep:  #6E7E66;  /* hover / emphasis */
  --clay:       #B08968;  /* warm clay — secondary accent */
  --line:       #C9C1B2;  /* hairline dividers */
  --card:       #F2EEE6;  /* raised surfaces */

  /* Type */
  --display: "Fraunces", Georgia, serif;
  --body:    "Inter", system-ui, -apple-system, sans-serif;

  /* Scale */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0:  clamp(1rem, 0.96rem + 0.2vw, 1.1rem);
  --step-1:  clamp(1.18rem, 1.1rem + 0.38vw, 1.38rem);
  --step-2:  clamp(1.45rem, 1.32rem + 0.75vw, 2rem);
  --step-3:  clamp(1.95rem, 1.6rem + 1.8vw, 3.05rem);
  --step-4:  clamp(2.55rem, 1.9rem + 3.4vw, 4.6rem);

  /* Space */
  --gap: clamp(0.9rem, 0.72rem + 0.75vw, 1.25rem);
  --section-y: clamp(2.4rem, 2rem + 3vw, 4.75rem);
  --measure: 62ch;
  --radius: 3px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Layout helpers ---------- */
.wrap { width: min(1080px, 92vw); margin-inline: auto; }
.narrow { width: min(720px, 92vw); margin-inline: auto; }
.section { padding-block: var(--section-y); }

/* Signature: the "grain line" — a thin rule with a small square notch */
.grain-line {
  border: 0;
  height: 1px;
  background: var(--line);
  position: relative;
  margin: 0;
}
.grain-line::before {
  content: "";
  position: absolute;
  left: 0; top: -3px;
  width: 7px; height: 7px;
  background: var(--sage);
  transform: rotate(45deg);
}

/* ---------- Typography ---------- */
h1, h2, h3 { font-family: var(--display); font-weight: 400; line-height: 1.12; margin: 0 0 0.42em; }
h1 { font-size: var(--step-4); letter-spacing: 0; }
h2 { font-size: var(--step-3); letter-spacing: 0; }
h3 { font-size: var(--step-1); }
p { margin: 0 0 0.85em; max-width: var(--measure); }
.lead { font-size: var(--step-1); color: var(--ink-soft); line-height: 1.45; }

.eyebrow {
  font-family: var(--body);
  font-size: var(--step--1);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sage-deep);
  margin: 0 0 0.95rem;
  display: block;
}

a { color: var(--sage-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--clay); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--body);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.85em 1.6em;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background .25s, color .25s, border-color .25s;
  border: 1px solid var(--ink);
}
.btn--solid { background: var(--ink); color: var(--paper); }
.btn--solid:hover { background: var(--sage-deep); border-color: var(--sage-deep); color: var(--paper); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--gap); margin-top: 1.5rem; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 0.9rem;
}
.brand {
  font-family: var(--display);
  font-size: var(--step-1);
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand span { color: var(--sage-deep); }
.nav-links { display: flex; gap: 1.25rem; list-style: none; margin: 0; padding: 0; align-items: center; }
.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  padding: 0.3em 0;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); border-color: var(--sage); }

.nav-toggle {
  display: none;
  background: none; border: 0; cursor: pointer;
  padding: 0.4rem; color: var(--ink);
}
.nav-toggle svg { display: block; }

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; inset: 100% 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: 0 4vw;
    max-height: 0; overflow: hidden;
    transition: max-height .3s ease, padding .3s ease;
  }
  .nav-links.open { max-height: 24rem; padding-block: 0.5rem 1.5rem; }
  .nav-links a { width: 100%; padding: 0.8rem 0; border-bottom: 1px solid var(--line); }
}

/* ---------- Hero ---------- */
.hero { padding-block: clamp(2.75rem, 2.2rem + 4vw, 5.75rem) var(--section-y); }
.hero h1 { max-width: 14ch; }
.hero .lead { max-width: 46ch; margin-top: 1.15rem; }

/* ---------- Cards / lists ---------- */
.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.2rem, 0.95rem + 1.1vw, 1.7rem);
}
.card h3 { margin-bottom: 0.4rem; }
.card .meta { font-size: var(--step--1); color: var(--sage-deep); letter-spacing: 0.04em; margin-bottom: 0.8rem; }
.card p:last-child { margin-bottom: 0; }

/* About — team */
.photo-placeholder {
  aspect-ratio: 4 / 5;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.photo-placeholder--sm { aspect-ratio: 1; margin-bottom: 1rem; }
.photo-placeholder--profile {
  aspect-ratio: 1;
  width: clamp(7rem, 18vw, 9.5rem);
  margin-inline: auto;
  background-repeat: no-repeat;
  border-radius: 50%;
  border: 7px solid color-mix(in srgb, var(--line) 52%, var(--paper));
  overflow: hidden;
}
.photo-placeholder--jessie {
  background-image: url("assets/jessie-cai.jpeg");
  background-position: 50% 32%;
  background-size: 240%;
}
.photo-placeholder--dallas {
  background-image: url("assets/dallas-chu.png");
  background-position: 50% 24%;
  background-size: cover;
}
.photo-placeholder--william {
  background-image: url("assets/william-lee.jpg");
  background-position: 50% 5%;
  background-size: 150%;
}
.person-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}
@media (max-width: 720px) {
  .person-grid { grid-template-columns: 1fr; }
}
.person-card {
  width: 100%;
  margin: 1.25rem 0 0;
  padding: clamp(1.9rem, 4vw, 3rem) clamp(1.25rem, 4vw, 3rem);
  text-align: center;
  background: color-mix(in srgb, var(--card) 78%, var(--paper));
  border: 1px solid color-mix(in srgb, var(--line) 78%, var(--ink-soft));
  border-radius: 22px;
}
.about-page .eyebrow {
  text-align: center;
}
.about-page .hero .eyebrow {
  text-align: left;
}
.person-card h2 {
  margin: 1.15rem 0 0.2rem;
  font-family: var(--display);
  font-size: clamp(1.8rem, 1.5rem + 1vw, 2.25rem);
  font-weight: 400;
  line-height: 1.15;
}
.person-role {
  margin: 0 0 0.25rem;
  max-width: none;
  color: var(--sage-deep);
  font-size: clamp(1.05rem, 0.98rem + 0.45vw, 1.3rem);
  line-height: 1.35;
}
.person-location {
  margin: 0 0 1.2rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
}
.person-bio {
  margin-inline: auto;
  color: var(--ink-soft);
  font-size: clamp(1rem, 0.96rem + 0.22vw, 1.12rem);
  line-height: 1.58;
}
.linkedin-link {
  display: inline-block;
  margin-top: 0.85rem;
  color: var(--sage-deep);
  font-size: clamp(1rem, 0.96rem + 0.22vw, 1.12rem);
  font-weight: 600;
  text-decoration: none;
}
.linkedin-link:hover { color: var(--clay); }
.person-lead { align-items: start; gap: clamp(1.5rem, 3vw, 3rem); margin-top: 1.25rem; }
.person-lead h2 { margin-bottom: 0.75rem; }

/* About — compact educator roster */
.educator-section {
  margin-top: clamp(3.5rem, 7vw, 6.5rem);
  padding-top: clamp(2.5rem, 5vw, 4.5rem);
  border-top: 1px solid var(--line);
}
.educator-heading {
  width: min(42rem, 100%);
  margin: 0 auto clamp(1.75rem, 4vw, 3rem);
  text-align: center;
}
.educator-heading h2 {
  font-size: clamp(1.8rem, 1.45rem + 1.4vw, 2.7rem);
}
.educator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: var(--gap);
  align-items: start;
}
.educator-card {
  padding: 1.35rem 1.15rem 1.1rem;
  text-align: center;
  background: color-mix(in srgb, var(--card) 76%, var(--paper));
  border: 1px solid var(--line);
  border-radius: 14px;
}
.educator-photo {
  width: 5.75rem;
  aspect-ratio: 1;
  margin: 0 auto 0.9rem;
  background-color: var(--paper-2);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  border: 5px solid color-mix(in srgb, var(--line) 48%, var(--paper));
  border-radius: 50%;
}
.educator-photo--ashwath {
  background-image: url("assets/ashwath-narayan.jpg");
  background-position: 72% 20%;
  background-size: 330%;
}
.educator-photo--brad {
  background-image: url("assets/brad-pei.jpg");
  background-position: 50% 42%;
  background-size: 155%;
}
.educator-photo--braden {
  background-image: url("assets/braden-cong.jpg");
  background-position: 50% 35%;
  background-size: 125%;
}
.educator-photo--frederick {
  background-image: url("assets/frederick-ou.jpg");
  background-position: 36% 43%;
  background-size: 185%;
}
.educator-photo--jacob {
  background-image: url("assets/jacob-villeneuve.jpg");
  background-position: 52% 32%;
  background-size: 135%;
}
.educator-photo--landon {
  background-image: url("assets/landon-fu.jpg");
  background-position: 50% 35%;
  background-size: 112%;
}
.educator-photo--sanju {
  background-image: url("assets/sanju-chanumalla.jpg");
  background-position: 52% 28%;
  background-size: 125%;
}
.educator-photo--diya {
  background-image: url("assets/diya-chetty.jpg");
  background-position: 54% 26%;
  background-size: 205%;
}
.educator-card h3 {
  margin: 0 0 0.15rem;
  font-size: clamp(1.2rem, 1.1rem + 0.35vw, 1.45rem);
}
.educator-role {
  margin: 0 0 0.85rem;
  max-width: none;
  color: var(--sage-deep);
  font-size: 0.78rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.educator-bio {
  border-top: 1px solid var(--line);
  text-align: left;
}
.educator-bio summary {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  padding-top: 0.85rem;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.78rem;
  list-style: none;
}
.educator-bio summary::-webkit-details-marker { display: none; }
.educator-bio summary::after {
  content: "+";
  color: var(--sage-deep);
  font-size: 1rem;
  line-height: 1;
}
.educator-bio[open] summary::after { content: "−"; }
.educator-bio summary:hover { color: var(--sage-deep); }
.educator-bio p {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
  line-height: 1.55;
}
@media (max-width: 520px) {
  .educator-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .educator-card { padding-inline: 0.75rem; }
  .educator-photo { width: 5rem; }
}
@media (max-width: 370px) {
  .educator-grid { grid-template-columns: 1fr; }
}

/* Workshop entry (list style, not boxed) */
.entry { display: grid; grid-template-columns: 10rem 1fr; gap: var(--gap); padding-block: 1.55rem; border-bottom: 1px solid var(--line); }
.entry:last-child { border-bottom: 0; }
.entry .when { font-size: var(--step--1); color: var(--sage-deep); letter-spacing: 0.03em; padding-top: 0.4rem; }
.entry h3 { margin-bottom: 0.7rem; }
@media (max-width: 620px) { .entry { grid-template-columns: 1fr; gap: 0.4rem; } .entry .when { padding-top: 0; } }

/* Section heading block */
.section-head { max-width: 40ch; margin-bottom: 2.2rem; }

/* Resource links */
.res-list { list-style: none; padding: 0; margin: 0; }
.res-list li { padding: 0.9rem 0; border-bottom: 1px solid var(--line); }
.res-list li:last-child { border-bottom: 0; }
.res-list a { font-family: var(--display); font-size: var(--step-1); color: var(--ink); text-decoration: none; }
.res-list a:hover { color: var(--sage-deep); }
.res-list .note { display: block; font-size: var(--step--1); color: var(--ink-soft); margin-top: 0.2rem; }

.pdf-material {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.pdf-material iframe {
  display: block;
  width: 100%;
  height: min(76vh, 760px);
  min-height: 520px;
  border: 0;
}
@media (max-width: 620px) {
  .pdf-material iframe {
    height: 68vh;
    min-height: 420px;
  }
}

/* ---------- FAQ accordion ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; list-style: none;
  padding: 1.15rem 0; font-family: var(--display); font-size: var(--step-1);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--sage-deep); font-family: var(--body); font-size: 1.4rem; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding-bottom: 1.15rem; color: var(--ink-soft); }


.contact-layout {
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  align-items: start;
  gap: 2rem;
}
.contact-form-embed { display: block; width: 100%; height: 900px; border: 0; }
@media (max-width: 720px) {
  .contact-layout { grid-template-columns: minmax(0, 1fr); }
  .contact-form-embed { height: 1050px; }
}

/* ---------- Testimonials ---------- */
.quote { font-family: var(--display); font-size: var(--step-1); line-height: 1.4; color: var(--ink); }
.quote cite { display: block; font-family: var(--body); font-size: var(--step--1); font-style: normal; color: var(--sage-deep); margin-top: 0.8rem; letter-spacing: 0.04em; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding-block: 2.7rem 2.1rem; margin-top: var(--section-y); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--gap); }
.site-footer .brand { display: inline-block; margin-bottom: 0.8rem; }
.site-footer p { color: var(--ink-soft); font-size: var(--step--1); max-width: 34ch; }
.footer-col h4 { font-family: var(--body); font-size: var(--step--1); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink); margin: 0 0 1rem; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 0.6rem; }
.footer-col a { color: var(--ink-soft); text-decoration: none; font-size: var(--step--1); }
.footer-col a:hover { color: var(--sage-deep); }
.footer-base { margin-top: 1.9rem; padding-top: 1.25rem; border-top: 1px solid var(--line); font-size: var(--step--1); color: var(--ink-soft); }
@media (max-width: 620px) { .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; } }

/* ---------- Motion (fade up on scroll) ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* Skip link */
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--ink); color: var(--paper); padding: 0.6em 1em; border-radius: var(--radius); z-index: 100; }