/* Design Thinking @ SL — minimalist revamp
   Shares the AHLab design language with ice2026.designthinking.lk.
   Colourful photos are rendered greyscale + brand-tinted (duotone); the
   accent is a purple→cyan gradient; the octagon is the signature shape. */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-text);
  background: var(--bg);
  color: var(--text-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--text);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
}

a { color: var(--color-accent); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--color-accent-dark); }
img { max-width: 100%; display: block; }

/* rounded-corner octagon clip — the shared brand shape */
.octagon {
  clip-path: url(#octr);
  -webkit-clip-path: url(#octr);
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ------------------------------------------------------------- shared bits */

.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 18px;
}

.grad-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  padding: 13px 26px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s, transform 0.1s, filter 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn-gradient {
  background: linear-gradient(90deg, #00D7EE 0%, #2E6BF6 55%, #6100FF 100%);
  color: #fff;
  box-shadow: 0 6px 20px -6px rgba(97, 0, 255, 0.5);
}
.btn-gradient:hover { filter: brightness(1.07); color: #fff; }
.btn-outline {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

.section { padding: 104px 0; }
.section-head { max-width: 640px; margin: 0 auto 56px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.section-title { font-size: clamp(2rem, 4vw, 2.9rem); }
.section-sub { margin-top: 16px; font-size: 1.08rem; color: var(--text-muted); }

/* --------------------------------------------------------------- duotone */
/* Photos: greyscale by default with a brand-purple duotone wash, easing to
   full colour on hover. Wrap any <img> in .media to apply. */
.media {
  position: relative;
  overflow: hidden;
  background: var(--bg-subtle);
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.04) brightness(1.02);
  transition: filter 0.5s ease, transform 0.6s ease;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-brand);
  mix-blend-mode: color;
  opacity: 0.55;
  transition: opacity 0.5s ease;
  pointer-events: none;
}
.media:hover img { filter: grayscale(0) contrast(1) brightness(1); transform: scale(1.03); }
.media:hover::after { opacity: 0; }

/* ------------------------------------------------------------------ header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, padding 0.3s ease;
}
.header.scrolled { border-bottom-color: var(--border); }
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 74px;
}
.logo img { height: 34px; width: auto; transition: height 0.3s ease; }
/* the wordmark is dark ink; lift it in dark mode */
:root[data-theme="dark"] .logo img { filter: brightness(0) invert(1); }

.nav { display: flex; align-items: center; gap: 30px; }
.nav-link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  color: var(--text-body);
  position: relative;
  padding: 4px 0;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--gradient-brand);
  transition: width 0.25s ease;
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 14px; }
.theme-toggle {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-body);
  cursor: pointer;
  font-size: 15px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.theme-toggle:hover { color: var(--color-accent); border-color: var(--color-accent); }
.theme-toggle .fa-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .fa-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .fa-sun { display: block; }
/* the in-nav toggle only exists for the mobile menu; the header-actions one
   is the single toggle on desktop */
.nav .theme-toggle { display: none; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 17px;
}

/* -------------------------------------------------------------------- hero */
.hero {
  position: relative;
  padding: clamp(32px, 4vw, 56px) 0 clamp(56px, 7vw, 96px);
  overflow: hidden;
}
/* soft brand glow behind the hero */
.hero::before {
  content: "";
  position: absolute;
  top: -30%; right: -10%;
  width: 720px; height: 720px;
  background: radial-gradient(circle, rgba(97,0,255,0.14), transparent 62%);
  pointer-events: none;
}
:root[data-theme="dark"] .hero::before { background: radial-gradient(circle, rgba(0,215,238,0.12), transparent 62%); }
.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 64px;
}
.hero-title {
  font-size: clamp(2.6rem, 5.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--text);
}
.hero-sub {
  margin: 26px 0 36px;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--text-muted);
  max-width: 30ch;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }

.hero-media {
  position: relative;
  aspect-ratio: 1 / 1;
  width: 100%;
}
.hero-media .media {
  width: 100%; height: 100%;
}

/* ------------------------------------------------------------------- about */
.about { background: var(--bg-subtle); }
.about .container {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: center;
}
.about-media { aspect-ratio: 1 / 1; }
.about-media .media { width: 100%; height: 100%; }
.about-text p { font-size: 1.08rem; line-height: 1.8; margin-bottom: 20px; color: var(--text-body); }
.about-text p:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------------- programs */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 72px;
}
.program-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
  overflow: hidden;
}
.program-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  height: 3px; width: 100%;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.program-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.program-card:hover::before { transform: scaleX(1); }
.program-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 18px;
}
.program-card h3 { font-size: 1.4rem; margin-bottom: 12px; color: var(--text); }
.program-card p { color: var(--text-muted); font-size: 1rem; }

.programs-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
/* square keeps the octagon regular (the clip path is normalised to a square) */
.feature-media { aspect-ratio: 1 / 1; }
.programs-feature blockquote {
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
  font-weight: 500;
}
.programs-feature cite {
  display: block;
  margin-top: 20px;
  font-style: normal;
  font-size: 0.98rem;
  color: var(--text-muted);
}

/* ---------------------------------------------------------- past workshops */
.workshops-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
  max-width: 760px;
  margin: 0 auto;
}
.workshop-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}
.workshop-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}
.workshop-year {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  color: #fff;
  background: var(--gradient-brand);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.workshop-card h3 { font-size: 1.5rem; color: var(--text); margin-bottom: 8px; }
.workshop-card p { color: var(--text-muted); margin-bottom: 16px; }
.workshop-link { font-family: var(--font-display); font-weight: 600; color: var(--color-accent); font-size: 0.98rem; }

/* ----------------------------------------------------------------- clients */
.clients { background: var(--bg-subtle); }
.logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 14px;
  max-width: 980px;
  margin: 0 auto;
}
.logo-grid img {
  width: 100%;
  height: 84px;
  object-fit: contain;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  filter: grayscale(1);
  opacity: 0.6;
  transition: filter 0.3s ease, opacity 0.3s ease;
}
.logo-grid img:hover { filter: grayscale(0); opacity: 1; }
:root[data-theme="dark"] .logo-grid img { background: #fff; }

.partners-title {
  text-align: center;
  font-size: 1.4rem;
  color: var(--text);
  margin: 72px 0 32px;
}
.partners-grid { max-width: 640px; }

/* ----------------------------------------------------------------- contact */
.contact .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.contact-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 44px;
  box-shadow: var(--shadow-md);
}
.contact-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:first-child { padding-top: 0; }
.contact-item:last-child { padding-bottom: 0; border-bottom: none; }
.contact-meta { min-width: 0; }
.contact-action {
  flex: none;
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  color: var(--text-body);
  font-size: 16px;
  transition: color 0.15s, border-color 0.15s, background 0.15s, box-shadow 0.15s, transform 0.1s;
}
.contact-action:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(90deg, #00D7EE 0%, #2E6BF6 55%, #6100FF 100%);
  box-shadow: 0 6px 18px -6px rgba(97, 0, 255, 0.5);
}
.contact-action:active { transform: translateY(1px); }
.contact-label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 8px;
}
.contact-value {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
}
a.contact-value:hover { color: var(--color-accent); }

/* ------------------------------------------------------------------ footer */
.footer {
  background: var(--text);
  color: var(--color-neutral-40);
  padding: 56px 0 40px;
}
:root[data-theme="dark"] .footer { background: #0A0B0D; }
.footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}
.footer-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: #fff;
  letter-spacing: -0.02em;
}
.footer-brand span { color: var(--color-neutral-60); font-weight: 500; margin-left: 10px; font-size: 0.9rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; }
.footer-links a { color: var(--color-neutral-40); font-size: 0.95rem; }
.footer-links a:hover { color: #fff; }

/* --------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  .hero .container,
  .about .container,
  .programs-feature,
  .contact .container { grid-template-columns: 1fr; gap: 44px; }
  .hero-media { max-width: 460px; margin: 0 auto; }
  .about-media { max-width: 460px; }
  .programs-grid { grid-template-columns: 1fr; }
  .section { padding: 76px 0; }
}

@media (max-width: 720px) {
  .nav, .header-actions .theme-toggle { display: none; }
  .nav-toggle { display: grid; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 74px; left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 20px 28px 26px;
    gap: 18px;
    box-shadow: var(--shadow-md);
  }
  .nav.open .theme-toggle { display: grid; }
  .container { padding: 0 20px; }
  .contact-panel { padding: 32px 26px; }
}