/* ============================================================
   ACS Group — Hub Page Styles
   Modern, accessible, responsive, light/dark aware.
   ============================================================ */

:root {
  --bg: #f7f8fc;
  --bg-elev: #ffffff;
  --bg-soft: #eef1fb;
  --ink: #0b1437;
  --ink-soft: #4a5278;
  --ink-mute: #6b7398;
  --line: #e3e7f3;
  --line-strong: #cdd3e6;
  --accent: #2d4cf0;
  --accent-2: #6a3bff;
  --accent-3: #00b8a9;
  --accent-ink: #ffffff;
  --gold: #f4b400;
  --danger: #e0364e;

  --shadow-sm: 0 1px 2px rgba(11, 20, 55, 0.06), 0 1px 1px rgba(11, 20, 55, 0.04);
  --shadow-md: 0 10px 24px -12px rgba(11, 20, 55, 0.18), 0 4px 10px -4px rgba(11, 20, 55, 0.08);
  --shadow-lg: 0 30px 60px -24px rgba(11, 20, 55, 0.28), 0 12px 20px -10px rgba(11, 20, 55, 0.12);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --container: 1200px;
  --gutter: clamp(16px, 4vw, 32px);

  --t-fast: 160ms ease;
  --t-base: 240ms cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-slow: 420ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07091a;
    --bg-elev: #0e1230;
    --bg-soft: #131841;
    --ink: #f3f5ff;
    --ink-soft: #c4c9e8;
    --ink-mute: #8c93bd;
    --line: #1c2150;
    --line-strong: #2a3173;
    --accent: #6c8bff;
    --accent-2: #a98bff;
    --accent-3: #2ee0cf;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 10px 24px -12px rgba(0, 0, 0, 0.6), 0 4px 10px -4px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 30px 60px -24px rgba(0, 0, 0, 0.7), 0 12px 20px -10px rgba(0, 0, 0, 0.55);
  }
}

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

body {
  margin: 0;
  font-family:
    "Inter", "Hind Siliguri", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--t-fast);
}

a:hover {
  color: var(--accent-2);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 65%, transparent);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--accent-ink);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  z-index: 999;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.brand-mark img {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  object-fit: cover;
  background: #fff;
}
.brand-mark__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  font-style: normal;
}
.brand-mark__text strong {
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand-mark__text em {
  font-style: normal;
  font-size: 0.78rem;
  color: var(--ink-mute);
  margin-top: 2px;
}

.site-nav {
  display: flex;
  gap: 4px;
}
.site-nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.95rem;
}
.site-nav a:hover {
  background: var(--bg-soft);
  color: var(--ink);
}

@media (max-width: 560px) {
  .site-nav {
    display: none;
  }
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding-block: clamp(56px, 9vw, 112px);
  overflow: hidden;
  isolation: isolate;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  pointer-events: none;
}
.hero::before {
  width: 520px;
  height: 520px;
  background: radial-gradient(closest-side, var(--accent), transparent);
  top: -120px;
  left: -120px;
}
.hero::after {
  width: 480px;
  height: 480px;
  background: radial-gradient(closest-side, var(--accent-2), transparent);
  bottom: -160px;
  right: -120px;
}

.hero-inner {
  text-align: center;
  display: grid;
  justify-items: center;
  gap: 18px;
}

.hero-logo {
  width: 128px;
  height: 128px;
  border-radius: 28px;
  display: grid;
  place-items: center;
  background: var(--bg-elev);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  padding: 10px;
}
.hero-logo img {
  width: 100%;
  height: 100%;
  border-radius: 20px;
  object-fit: cover;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
}

h1,
h2,
h3,
h4 {
  font-family: inherit;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 5.5vw, 3.6rem);
  font-weight: 800;
}

.gradient-text {
  background: linear-gradient(120deg, var(--accent), var(--accent-2) 55%, var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  max-width: 62ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
}

.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

.btn {
  --btn-bg: var(--ink);
  --btn-ink: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  background: var(--btn-bg);
  color: var(--btn-ink);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast), box-shadow var(--t-fast), background var(--t-fast),
    color var(--t-fast);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn:active {
  transform: translateY(0);
}

.btn--primary {
  --btn-bg: linear-gradient(120deg, var(--accent), var(--accent-2));
  --btn-ink: #fff;
  background: var(--btn-bg);
}
.btn--ghost {
  --btn-bg: transparent;
  --btn-ink: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  background: var(--bg-soft);
}

.hero-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 14px 18px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.hero-stats li {
  display: grid;
  gap: 2px;
  padding: 8px 6px;
  border-right: 1px solid var(--line);
}
.hero-stats li:last-child {
  border-right: 0;
}
.hero-stats strong {
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}
.hero-stats span {
  font-size: 0.78rem;
  color: var(--ink-mute);
}
@media (max-width: 640px) {
  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .hero-stats li {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .hero-stats li:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

/* ---------- Section heads ---------- */

.section-head {
  display: grid;
  gap: 10px;
  justify-items: center;
  text-align: center;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.section-head h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 800;
}
.section-sub {
  margin: 0;
  color: var(--ink-soft);
  max-width: 60ch;
}

/* ---------- Brand grid ---------- */

.brands {
  padding-block: clamp(48px, 8vw, 96px);
}

.brand-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.brand-card {
  --card-accent: var(--accent);
  position: relative;
  display: grid;
  gap: 14px;
  padding: 22px 22px 24px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
}

.brand-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, transparent, color-mix(in srgb, var(--card-accent) 55%, transparent));
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--t-base);
  z-index: 1;
  pointer-events: none;
}

.brand-card::after {
  content: "";
  position: absolute;
  inset: auto -40% -60% auto;
  width: 80%;
  aspect-ratio: 1 / 1;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--card-accent) 40%, transparent), transparent);
  filter: blur(40px);
  opacity: 0;
  transition: opacity var(--t-slow);
  z-index: 0;
  pointer-events: none;
}

.brand-card:hover,
.brand-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--card-accent) 40%, var(--line));
}
.brand-card:hover::before,
.brand-card:focus-visible::before {
  opacity: 1;
}
.brand-card:hover::after,
.brand-card:focus-visible::after {
  opacity: 0.8;
}

.brand-card > * {
  position: relative;
  z-index: 2;
}

.brand-card__badge {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--card-accent) 14%, var(--bg-elev));
  color: color-mix(in srgb, var(--card-accent) 80%, var(--ink));
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid color-mix(in srgb, var(--card-accent) 25%, var(--line));
}

.brand-card__logo {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 10;
  background:
    radial-gradient(closest-side, color-mix(in srgb, var(--card-accent) 12%, transparent), transparent 70%),
    var(--bg-soft);
  border-radius: var(--radius-md);
  padding: 14px;
  border: 1px solid var(--line);
  overflow: hidden;
}
.brand-card__logo img {
  max-width: 78%;
  max-height: 90%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 6px 12px rgba(11, 20, 55, 0.08));
  transition: transform var(--t-base);
}
.brand-card:hover .brand-card__logo img {
  transform: scale(1.04);
}

.brand-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand-card__desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.brand-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  font-weight: 700;
  color: var(--card-accent);
  font-size: 0.95rem;
}
.brand-card__cta svg {
  transition: transform var(--t-base);
}
.brand-card:hover .brand-card__cta svg {
  transform: translateX(4px);
}

/* Per-brand accent colors */
.brand-card[data-brand="ACS Future School"] {
  --card-accent: #2d4cf0;
}
.brand-card[data-brand="ASG Shop"] {
  --card-accent: #ff7a00;
}
.brand-card[data-brand="Rhombus Publications"] {
  --card-accent: #e63946;
}
.brand-card[data-brand="Achieve"] {
  --card-accent: #00b894;
}
.brand-card[data-brand="ACS Engineering School"] {
  --card-accent: #5b4cdb;
}
.brand-card[data-brand="ACS Mart"] {
  --card-accent: #0d9488;
}

/* ---------- Upcoming brands section ---------- */

.brands--upcoming {
  background:
    linear-gradient(180deg, transparent, color-mix(in srgb, var(--gold) 6%, var(--bg)) 40%, transparent),
    var(--bg);
  border-block: 1px solid var(--line);
}

.brands--upcoming .section-head .eyebrow {
  color: var(--gold);
}

.brand-card__badge--upcoming {
  background: color-mix(in srgb, var(--gold) 18%, var(--bg-elev));
  color: color-mix(in srgb, var(--gold) 75%, var(--ink));
  border-color: color-mix(in srgb, var(--gold) 35%, var(--line));
}

.brand-grid--upcoming {
  max-width: 920px;
  margin-inline: auto;
}

@media (min-width: 900px) {
  .brand-grid--upcoming {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- About section ---------- */

.about {
  padding-block: clamp(48px, 8vw, 96px);
  background: var(--bg-soft);
  border-block: 1px solid var(--line);
}

.about-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}
.about-inner h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.about-inner p {
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.about-features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.about-features li {
  display: grid;
  gap: 4px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.about-features strong {
  color: var(--ink);
  font-size: 1.02rem;
}
.about-features span {
  color: var(--ink-mute);
  font-size: 0.88rem;
}

@media (max-width: 820px) {
  .about-inner {
    grid-template-columns: 1fr;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--bg-elev);
  border-top: 1px solid var(--line);
  padding-block: 40px 24px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.footer-brand {
  display: flex;
  gap: 14px;
  align-items: center;
}
.footer-brand img {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  object-fit: cover;
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.footer-brand strong {
  display: block;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.footer-brand p {
  margin: 4px 0 0;
  color: var(--ink-mute);
  font-size: 0.9rem;
}

.footer-links h4,
.footer-meta h4 {
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-mute);
  margin: 0 0 10px;
}
.footer-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.footer-links a {
  color: var(--ink-soft);
  font-weight: 500;
}
.footer-links a:hover {
  color: var(--accent);
}
.footer-meta p {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.9rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-mute);
}
.footer-bottom small {
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }
}

/* ---------- Reveal-on-scroll (progressive enhancement) ---------- */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Print ---------- */

@media print {
  .hero::before,
  .hero::after,
  .site-header,
  .site-footer,
  .hero-cta {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .brand-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #999;
  }
}