/* ==========================================================================
   CS Vidya — style.css
   Pure CSS, no frameworks. Mobile-first. Breakpoints at 768px and 1024px.
   ========================================================================== */

/* ---------------------------------------------------------------- Tokens */
:root {
  /* Brand colors (extracted from the CS Vidya logo) */
  /* Sampled from the CS Vidya crest logo (shield, cap, roundel, ribbon). */
  --color-green:      #4C6E4D;  /* PRIMARY — shield green; hero, nav, footer, sections */
  --color-green-dark: #3C5A3D;  /* derived: darker shield green for gradients/hover     */
  --color-green-soft: #5E8260;  /* derived: lighter laurel green for texture            */
  --color-navy:       #253659;  /* graduation cap / shield outline; cards, accents      */
  --color-gold:       #D2A352;  /* roundel ring gold; CTAs, hover states, highlights    */
  --color-gold-dark:  #B38447;  /* derived: gold hover/pressed (logo bronze-gold)       */
  --color-gold-ink:   #8F6B2C;  /* derived: darker gold for gold text on light bg (AA)  */
  --color-bronze:     #643F19;  /* dark brown crest outline; ribbon + secondary borders */
  --color-cream:      #D9C297;  /* parchment from the open book; warm light accent       */
  --color-ice:        #F2EEE4;  /* warm off-white (ribbon fill); card + light sections   */
  --color-ivory:      #F8F5EE;  /* alternating section backgrounds (warm ivory)          */
  --color-text-dark:  #1A1F2B;  /* body text on light backgrounds                       */
  --color-text-light: #F2EEE4;  /* body text on dark/green backgrounds                  */
  --color-text-muted: rgba(242, 238, 228, 0.74); /* muted light text                   */

  /* RGB channels of the brand colors, for use inside rgba() (tints, shadows,
     translucent borders). Keep these in sync with the hex values above so the
     palette has a single source of truth. */
  --rgb-green:  76, 110, 77;
  --rgb-navy:   37, 54, 89;
  --rgb-gold:   210, 163, 82;
  --rgb-bronze: 100, 63, 25;
  --rgb-light:  242, 238, 228;

  /* Typography */
  --font-display: "Playfair Display", Georgia, serif;
  --font-body:    "Inter", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, monospace;

  /* Spacing scale */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  /* Layout */
  --container-max: 1140px;
  --radius:    14px;
  --radius-sm: 10px;
  --radius-pill: 999px;

  /* Effects */
  --shadow-card: 0 6px 24px rgba(var(--rgb-navy), 0.10);
  --shadow-lift: 0 18px 44px rgba(var(--rgb-navy), 0.20);
  --nav-height: 68px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height); /* keep anchored sections clear of sticky nav */
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text-dark);
  background: var(--color-ivory);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }
ul  { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { margin: 0; line-height: 1.15; }

/* ---------------------------------------------------------------- Layout */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.section { padding-block: var(--space-2xl); }

/* ---------------------------------------------------------------- Shared: ribbon eyebrow */
/* Echoes the logo's bronze ribbon banner */
.ribbon {
  display: inline-block;
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-light);
  background: var(--color-bronze);
  padding: 0.4em 1.1em;
  margin-bottom: var(--space-md);
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%); /* slanted banner */
}
/* Folded ribbon tails */
.ribbon::before,
.ribbon::after {
  content: "";
  position: absolute;
  top: 100%;
  border: 5px solid transparent;
}
.ribbon::before { left: 0;  border-top-color: var(--color-green-dark); }
.ribbon::after  { right: 0; border-top-color: var(--color-green-dark); }

/* ---------------------------------------------------------------- Shared: section heading + rule */
.section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  color: var(--color-navy);
}
.section__title--light { color: var(--color-ivory); }

/* Thin bronze rule under headings */
.rule {
  display: block;
  width: 64px;
  height: 3px;
  background: var(--color-bronze);
  border-radius: var(--radius-pill);
  margin-top: var(--space-md);
}
.rule--center { margin-inline: auto; }

.section__head { margin-bottom: var(--space-xl); }
.section__head--center { text-align: center; }
.section__head--center .ribbon { margin-inline: auto; display: table; }

/* ---------------------------------------------------------------- Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.85em 1.7em;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition);
}
.btn:hover { transform: translateY(-2px); }

/* Primary: gold bg, navy text */
.btn--primary {
  background: var(--color-gold);
  color: var(--color-navy);
}
.btn--primary:hover { background: var(--color-gold-dark); }

/* Ghost: gold border, light label, transparent. Light text keeps the label
   legible on the green hero (gold-on-green can't reach AA); the gold border
   carries the accent, and hover fills solid gold with navy text. */
.btn--ghost {
  background: transparent;
  color: var(--color-text-light);
  border-color: var(--color-gold);
}
.btn--ghost:hover {
  background: var(--color-gold);
  color: var(--color-navy);
  border-color: var(--color-gold);
}

/* Green: green bg, ivory text */
.btn--green {
  background: var(--color-green);
  color: var(--color-ivory);
}
.btn--green:hover { background: var(--color-gold); color: var(--color-navy); }

.btn--lg { font-size: 1.08rem; padding: 1em 2.2em; }

/* ---------------------------------------------------------------- Pills */
.pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.45em 1em;
  border-radius: var(--radius-pill);
}
.pill--stat   { background: var(--color-green); color: var(--color-ivory); }
.pill--green  { background: var(--color-green); color: var(--color-ivory); }
.pill--bronze-outline {
  background: transparent;
  color: var(--color-bronze);
  border: 1.5px solid var(--color-bronze);
}

/* ==========================================================================
   NAV
   ========================================================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-navy);
  border-bottom: 2px solid var(--color-gold); /* thin gold border */
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-height);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.nav__logo {
  height: 44px;
  width: auto; /* preserve aspect ratio */
}
.nav__wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.45rem;
  color: var(--color-ivory);
}
.nav__links {
  display: flex;
  gap: var(--space-lg);
}
.nav__links a {
  font-weight: 500;
  color: var(--color-ivory);
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--color-gold); }

/* Hamburger (hidden on desktop) */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}
.nav__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-ivory);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
/* Animated X when open */
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--color-green);
  /* Subtle radial glow + faint dot-grid texture (CSS only) */
  background-image:
    radial-gradient(circle at 50% 30%, var(--color-green-soft) 0%, transparent 55%),
    radial-gradient(rgba(var(--rgb-light), 0.06) 1.2px, transparent 1.2px);
  background-size: 100% 100%, 26px 26px;
}
.hero__inner {
  text-align: center;
  padding-block: var(--space-2xl);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero__logo {
  height: 240px;
  width: auto; /* preserve aspect ratio */
  margin-bottom: var(--space-lg);
  filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.28));
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 7vw, 4.5rem);
  color: var(--color-ivory);
  max-width: 16ch;
}
.hero__subtitle {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 44ch;
  margin: var(--space-md) 0 var(--space-lg);
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

/* ==========================================================================
   ABOUT
   ========================================================================== */
.about { background: var(--color-ivory); }
.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: center;
}
.about__body {
  font-size: 1.05rem;
  color: var(--color-text-dark);
  margin-top: var(--space-md);
}
.stat-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

/* Sanskrit card */
.about__card {
  background: var(--color-ice);
  border: 2px solid var(--color-navy);
  border-radius: var(--radius);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-card);
}
.sanskrit {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4.5rem, 12vw, 7rem);
  color: var(--color-gold); /* large decorative glyph (aria-hidden); echoes the logo's gold roundel */
  line-height: 1;
}
.sanskrit__caption {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-bronze);
  margin: var(--space-md) 0 0;
}

/* ==========================================================================
   OFFERINGS
   ========================================================================== */
.offerings { background: var(--color-ice); }
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}
.card {
  position: relative;
  background: #fff;
  border: 1px solid rgba(var(--rgb-navy), 0.12);
  border-radius: var(--radius);
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }

/* Top accent bar */
.card__accent {
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
}
.card__accent--gold   { background: var(--color-gold); }
.card__accent--green  { background: var(--color-green); }
.card__accent--bronze { background: var(--color-bronze); }

/* Featured card: elevated */
.card--featured {
  border-color: rgba(var(--rgb-green), 0.40);
  box-shadow: var(--shadow-lift);
}
.card--featured:hover { transform: translateY(-6px); }

/* Muted (coming soon) card */
.card--muted { background: #FAF7F0; }
.card--muted .card__body { color: rgba(26, 31, 43, 0.72); }

/* Badge pinned top-right */
.card__badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
}

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}
.card__icon--gold   { background: rgba(var(--rgb-gold), 0.16);   color: var(--color-gold); }
.card__icon--green  { background: rgba(var(--rgb-green), 0.16);  color: var(--color-green); }
.card__icon--bronze { background: rgba(var(--rgb-bronze), 0.14); color: var(--color-bronze); }

.card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-navy);
  margin-bottom: var(--space-xs);
}
.card__body {
  color: var(--color-text-dark);
  flex-grow: 1; /* push CTA/link to a consistent bottom line */
}
.card__link {
  display: inline-block;
  margin-top: var(--space-md);
  font-weight: 600;
  color: var(--color-gold-ink); /* darker gold so the link clears AA on the white card */
  transition: color var(--transition);
}
.card__link:hover { color: var(--color-bronze); }
.card__cta { margin-top: var(--space-md); align-self: flex-start; }
.card--muted .pill--bronze-outline { margin-top: var(--space-md); align-self: flex-start; }

/* ==========================================================================
   YOUTUBE
   ========================================================================== */
.youtube {
  background-color: var(--color-green);
  background-image: radial-gradient(circle at 50% 0%, var(--color-green-soft) 0%, transparent 60%);
}
.youtube__inner { text-align: center; display: flex; flex-direction: column; align-items: center; }
.youtube__sub {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin: var(--space-md) 0 var(--space-lg);
}

/* Static video-card placeholder */
.video-card {
  position: relative;
  width: min(100%, 640px);
  aspect-ratio: 16 / 9;
  background: var(--color-green-dark);
  border: 2px solid rgba(var(--rgb-light), 0.18);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  box-shadow: var(--shadow-lift);
  transition: transform var(--transition), border-color var(--transition);
}
.video-card:hover { transform: translateY(-4px); border-color: var(--color-gold); }
.video-card__play {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 82px;
  height: 82px;
  border-radius: 50%;
  background: var(--color-gold);
  color: var(--color-navy);
  padding-left: 5px; /* optical centering of the play triangle */
  transition: transform var(--transition), background var(--transition);
}
.video-card:hover .video-card__play { transform: scale(1.06); }
.video-card__channel {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-text-light);
}
.youtube__cta { margin-top: var(--space-lg); }

/* Topic pills */
.topic-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}
.topic-pills li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text-light);
  border: 1.5px solid var(--color-gold);
  border-radius: var(--radius-pill);
  padding: 0.4em 1em;
  transition: background var(--transition), color var(--transition);
}
.topic-pills li:hover { background: var(--color-gold); color: var(--color-navy); }

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact { background: var(--color-ivory); }
.contact__inner { text-align: center; display: flex; flex-direction: column; align-items: center; }
.contact__inner .ribbon { display: table; }
.contact__body {
  font-size: 1.08rem;
  color: var(--color-text-dark);
  max-width: 50ch;
  margin: var(--space-md) 0 var(--space-lg);
}

/* Social rows (shared) */
.social { display: flex; gap: var(--space-md); align-items: center; }
.social--dark-icons { margin-top: var(--space-xl); }
.social--dark-icons a { color: var(--color-navy); transition: color var(--transition), transform var(--transition); }
.social--dark-icons a:hover { color: var(--color-gold); transform: translateY(-2px); }
.social--light-icons a { color: var(--color-ivory); transition: color var(--transition), transform var(--transition); }
.social--light-icons a:hover { color: var(--color-gold); transform: translateY(-2px); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer { background: var(--color-navy); color: var(--color-text-light); }
.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  padding-block: var(--space-xl);
  text-align: center;
}
.footer__wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-ivory);
}
.footer__tagline { color: var(--color-text-muted); margin: var(--space-xs) 0 0; }
.footer__nav { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer__nav a { color: var(--color-text-light); transition: color var(--transition); }
.footer__nav a:hover { color: var(--color-gold); }
.footer__social { display: flex; flex-direction: column; align-items: center; gap: var(--space-md); }
.footer__domain { font-family: var(--font-mono); font-size: 0.9rem; color: var(--color-text-muted); }

.footer__bottom {
  border-top: 1px solid var(--color-gold); /* thin gold line */
  text-align: center;
}
.footer__bottom p {
  margin: 0;
  padding-block: var(--space-md);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   SCROLL REVEAL (IntersectionObserver target states)
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* Respect reduced-motion: show content immediately, no transform */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   RESPONSIVE — breakpoints at 768px and 1024px
   ========================================================================== */

/* ---- Mobile nav: show hamburger, collapse links into a green dropdown ---- */
@media (max-width: 767px) {
  .nav__toggle { display: flex; }

  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-green);
    border-bottom: 2px solid var(--color-gold);
    /* Collapsed by default */
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }
  .nav__links.is-open { max-height: 320px; }
  .nav__links a {
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid rgba(var(--rgb-light), 0.12);
  }
}

/* ---- Tablet and up (768px): two-column about, three-up offerings ---- */
@media (min-width: 768px) {
  .about__grid { grid-template-columns: 1fr 1fr; }
  .cards { grid-template-columns: repeat(3, 1fr); align-items: start; }

  .footer__grid {
    grid-template-columns: 1fr 1fr 1fr;
    text-align: left;
    align-items: start;
  }
  .footer__nav { align-items: flex-start; }
  .footer__social { align-items: flex-end; }
}

/* ---- Desktop (1024px): a touch more breathing room ---- */
@media (min-width: 1024px) {
  .hero__logo { height: 280px; }
  .about__grid { gap: var(--space-2xl); }
}