/* ==========================================================================
   OSSAI — Om Sree Sarvasakthi Aanmeega Valarchi Arakattalai
   Design system: sacred warm palette (saffron / temple gold / maroon / cream)
   ========================================================================== */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 1rem + 6vw, 6.5rem);

  /* Spacing */
  --space-1: 0.25rem;  --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem; --radius-full: 9999px;

  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 1040px;
  --content-wide: 1280px;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Hanken Grotesk', 'Inter', system-ui, sans-serif;
  --font-tamil: 'Noto Serif Tamil', serif;
}

/* Light (default) — warm sacred palette */
:root, [data-theme="light"] {
  --color-bg: #fbf6ec;
  --color-surface: #fdf9f0;
  --color-surface-2: #ffffff;
  --color-surface-offset: #f4ead6;
  --color-border: #e6d5b8;
  --color-divider: #efe2ca;

  --color-text: #2c1e12;
  --color-text-muted: #7a6650;
  --color-text-faint: #b3a288;
  --color-text-inverse: #fbf6ec;

  --color-primary: #b5411a;         /* temple terracotta / saffron-red */
  --color-primary-hover: #97300f;
  --color-primary-active: #7a260a;

  --color-gold: #c08a1e;            /* temple gold */
  --color-gold-soft: #e7c877;
  --color-maroon: #6e1f2e;          /* deep temple maroon */

  --shadow-sm: 0 1px 2px rgba(70, 40, 15, 0.07);
  --shadow-md: 0 6px 20px rgba(70, 40, 15, 0.10);
  --shadow-lg: 0 18px 48px rgba(70, 40, 15, 0.16);
}

[data-theme="dark"] {
  --color-bg: #1a130c;
  --color-surface: #211810;
  --color-surface-2: #2a1f14;
  --color-surface-offset: #2e2115;
  --color-border: #453322;
  --color-divider: #362818;

  --color-text: #f0e4d2;
  --color-text-muted: #b19c80;
  --color-text-faint: #6f5d47;
  --color-text-inverse: #1a130c;

  --color-primary: #e07a4a;
  --color-primary-hover: #ec8f61;
  --color-primary-active: #f0a37c;

  --color-gold: #e0b256;
  --color-gold-soft: #8a6a2c;
  --color-maroon: #b5566a;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.5);
  --shadow-lg: 0 18px 48px rgba(0,0,0,0.6);
}

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

html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

img, picture, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"] { list-style: none; }
button { cursor: pointer; background: none; border: none; color: inherit; font: inherit; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { text-wrap: balance; line-height: 1.12; font-family: var(--font-display); font-weight: 500; }
p, li { text-wrap: pretty; }

::selection { background: rgba(181, 65, 26, 0.2); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

a, button { transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ============================ layout ============================ */
.container { width: min(100% - 2.5rem, var(--content-wide)); margin-inline: auto; }
.container-narrow { width: min(100% - 2.5rem, var(--content-narrow)); margin-inline: auto; }
.section { padding-block: clamp(var(--space-16), 9vw, var(--space-32)); }

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-primary);
  display: inline-flex; align-items: center; gap: 0.6rem;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--color-primary); opacity: 0.6; }

.section-title { font-size: var(--text-2xl); color: var(--color-text); margin-top: var(--space-4); letter-spacing: -0.01em; }
.section-lead { font-size: var(--text-lg); color: var(--color-text-muted); margin-top: var(--space-5); max-width: 60ch; line-height: 1.55; }

/* ============================ header ============================ */
.header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.header--scrolled { border-bottom-color: var(--color-divider); box-shadow: var(--shadow-sm); }
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 4.75rem; }

.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand__mark { color: var(--color-primary); flex-shrink: 0; }
.brand__text { display: flex; flex-direction: column; line-height: 1.05; }
.brand__name { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; letter-spacing: 0.02em; color: var(--color-text); }
.brand__sub { font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--color-text-muted); font-weight: 500; }

.nav { display: flex; align-items: center; gap: var(--space-8); }
.nav__links { display: flex; align-items: center; gap: var(--space-6); }
.nav__links a { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted); position: relative; }
.nav__links a:hover { color: var(--color-primary); }
.nav__actions { display: flex; align-items: center; gap: var(--space-3); }

.theme-toggle { display: grid; place-items: center; width: 40px; height: 40px; border-radius: var(--radius-full); color: var(--color-text-muted); border: 1px solid var(--color-border); }
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-size: var(--text-sm); font-weight: 600;
  padding: 0.72rem 1.4rem; border-radius: var(--radius-full);
  letter-spacing: 0.01em; white-space: nowrap;
}
.btn--primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--color-primary-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--ghost { border: 1px solid var(--color-border); color: var(--color-text); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--lg { padding: 0.92rem 1.9rem; font-size: var(--text-base); }

.nav-toggle { display: none; }
.mobile-menu { display: none; }

/* ============================ hero ============================ */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; z-index: -2; }
.hero__bg img { width: 100%; height: 100%; object-fit: cover; }
.hero__overlay {
  position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(to right, rgba(26,15,7,0.78) 0%, rgba(26,15,7,0.5) 45%, rgba(26,15,7,0.15) 100%),
    linear-gradient(to top, rgba(26,15,7,0.7), rgba(26,15,7,0.1));
}
.hero__inner { padding-block: var(--space-24); max-width: 42rem; color: #fbf6ec; }
.hero__eyebrow { color: var(--color-gold-soft); }
.hero__eyebrow::before { background: var(--color-gold-soft); }
.hero h1 { font-size: var(--text-hero); font-weight: 500; margin-top: var(--space-5); letter-spacing: -0.015em; color: #fdf9f0; }
.hero__tamil { font-family: var(--font-tamil); font-size: var(--text-lg); color: var(--color-gold-soft); margin-top: var(--space-4); font-weight: 500; }
.hero__lead { font-size: var(--text-lg); color: rgba(251,246,236,0.86); margin-top: var(--space-6); max-width: 40ch; line-height: 1.55; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-top: var(--space-10); }
.hero__actions .btn--ghost { border-color: rgba(251,246,236,0.4); color: #fbf6ec; }
.hero__actions .btn--ghost:hover { border-color: var(--color-gold-soft); color: var(--color-gold-soft); }

.hero__meta { position: absolute; bottom: 0; left: 0; right: 0; }
.hero__meta-inner { display: flex; flex-wrap: wrap; gap: var(--space-8); padding-block: var(--space-6); border-top: 1px solid rgba(251,246,236,0.18); }
.hero__meta-item { color: rgba(251,246,236,0.9); }
.hero__meta-item strong { display: block; font-family: var(--font-display); font-size: var(--text-lg); color: var(--color-gold-soft); font-weight: 600; }
.hero__meta-item span { font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase; color: rgba(251,246,236,0.7); }

/* ============================ intro / about ============================ */
.about { position: relative; }
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(var(--space-10), 6vw, var(--space-24)); align-items: center; }
.about__body p + p { margin-top: var(--space-5); color: var(--color-text-muted); }
.about__lead { font-size: var(--text-lg); color: var(--color-text) !important; line-height: 1.55; }

.about__card {
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); padding: var(--space-8);
  box-shadow: var(--shadow-md);
}
.about__card h3 { font-size: var(--text-lg); margin-bottom: var(--space-5); color: var(--color-text); }
.fact { display: flex; gap: var(--space-4); padding-block: var(--space-4); border-bottom: 1px solid var(--color-divider); }
.fact:last-child { border-bottom: none; padding-bottom: 0; }
.fact__icon { color: var(--color-primary); flex-shrink: 0; margin-top: 2px; }
.fact__label { font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-text-faint); font-weight: 600; }
.fact__value { font-size: var(--text-sm); color: var(--color-text); margin-top: 2px; }

.vision-quote {
  margin-top: var(--space-20);
  border-left: 3px solid var(--color-primary);
  padding: var(--space-6) var(--space-8);
  background: var(--color-surface-offset);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.vision-quote p { font-family: var(--font-display); font-size: var(--text-lg); font-style: italic; color: var(--color-text); line-height: 1.5; max-width: 68ch; }

/* ============================ pillars ============================ */
.pillars { background: var(--color-surface); }
.pillars__head { text-align: center; max-width: 46rem; margin-inline: auto; }
.pillars__head .section-lead { margin-inline: auto; }
.pillars__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); margin-top: var(--space-16); }
.pillar {
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-8);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.pillar:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-gold-soft); }
.pillar__icon { width: 52px; height: 52px; display: grid; place-items: center; border-radius: var(--radius-md); background: color-mix(in srgb, var(--color-primary) 12%, transparent); color: var(--color-primary); margin-bottom: var(--space-5); }
.pillar h3 { font-size: var(--text-lg); color: var(--color-text); margin-bottom: var(--space-3); }
.pillar p { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6; }

/* ============================ feature split ============================ */
.feature { overflow: hidden; }
.feature__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(var(--space-10), 6vw, var(--space-20)); align-items: center; }
.feature__grid--reverse .feature__media { order: 2; }
.feature__media { border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.feature__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; transition: transform 0.9s cubic-bezier(0.16,1,0.3,1); }
.feature__media:hover img { transform: scale(1.04); }
.feature__content h3 { font-size: var(--text-xl); color: var(--color-text); margin-top: var(--space-4); }
.feature__content p { color: var(--color-text-muted); margin-top: var(--space-5); }
.feature__list { list-style: none; margin-top: var(--space-6); display: grid; gap: var(--space-3); }
.feature__list li { display: flex; gap: var(--space-3); font-size: var(--text-sm); color: var(--color-text); align-items: flex-start; }
.feature__list svg { color: var(--color-primary); flex-shrink: 0; margin-top: 3px; }

/* ============================ objectives ============================ */
.objectives { background: var(--color-surface); }
.obj-groups { display: grid; gap: var(--space-12); margin-top: var(--space-16); }
.obj-group__head { display: flex; align-items: baseline; gap: var(--space-4); margin-bottom: var(--space-6); padding-bottom: var(--space-4); border-bottom: 1px solid var(--color-divider); }
.obj-group__num { font-family: var(--font-display); font-size: var(--text-lg); color: var(--color-gold); font-weight: 600; }
.obj-group__title { font-size: var(--text-lg); color: var(--color-text); }
.obj-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4) var(--space-8); }
.obj-item { display: flex; gap: var(--space-3); font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.55; align-items: flex-start; }
.obj-item__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--color-primary); flex-shrink: 0; margin-top: 0.55em; }

/* ============================ CTA / donate ============================ */
.cta { position: relative; color: #fbf6ec; overflow: hidden; }
.cta__bg { position: absolute; inset: 0; z-index: -2; background: linear-gradient(135deg, var(--color-maroon), var(--color-primary)); }
.cta__pattern { position: absolute; inset: 0; z-index: -1; opacity: 0.14; background-image: radial-gradient(circle at 1px 1px, #fbf6ec 1px, transparent 0); background-size: 28px 28px; }
.cta__inner { text-align: center; max-width: 44rem; margin-inline: auto; }
.cta h2 { font-size: var(--text-2xl); color: #fdf9f0; }
.cta p { font-size: var(--text-lg); color: rgba(251,246,236,0.88); margin-top: var(--space-5); }
.cta__actions { display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: center; margin-top: var(--space-10); }
.cta .btn--primary { background: #fbf6ec; color: var(--color-maroon); }
.cta .btn--primary:hover { background: #fff; }
.cta .btn--ghost { border-color: rgba(251,246,236,0.5); color: #fbf6ec; }
.cta .btn--ghost:hover { border-color: #fff; background: rgba(251,246,236,0.1); }

/* ============================ contact ============================ */
.contact__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(var(--space-10), 6vw, var(--space-20)); }
.contact__cards { display: grid; gap: var(--space-4); margin-top: var(--space-8); }
.contact-card { display: flex; gap: var(--space-4); padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface-2); }
.contact-card__icon { width: 44px; height: 44px; flex-shrink: 0; display: grid; place-items: center; border-radius: var(--radius-md); background: color-mix(in srgb, var(--color-primary) 12%, transparent); color: var(--color-primary); }
.contact-card h4 { font-family: var(--font-body); font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-text-faint); font-weight: 600; }
.contact-card p { font-size: var(--text-sm); color: var(--color-text); margin-top: 3px; }
.contact-card p a { color: var(--color-text); }
.contact-card p a:hover { color: var(--color-primary); }

.form { display: grid; gap: var(--space-4); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-text-muted); }
.field input, .field textarea {
  padding: 0.8rem 1rem; border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-surface-2); color: var(--color-text); font-size: var(--text-sm);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent); }
.field textarea { resize: vertical; min-height: 110px; }
.form__note { font-size: var(--text-xs); color: var(--color-text-faint); }

/* ============================ footer ============================ */
.footer { background: var(--color-surface); border-top: 1px solid var(--color-divider); padding-block: var(--space-16) var(--space-8); }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--space-10); }
.footer__brand p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-5); max-width: 34ch; }
.footer__col h4 { font-family: var(--font-body); font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-text-faint); font-weight: 700; margin-bottom: var(--space-4); }
.footer__col a, .footer__col p { display: block; font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-3); }
.footer__col a:hover { color: var(--color-primary); }
.footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); margin-top: var(--space-12); padding-top: var(--space-6); border-top: 1px solid var(--color-divider); font-size: var(--text-xs); color: var(--color-text-faint); }

/* ============================ reveal animation ============================ */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s cubic-bezier(0.16,1,0.3,1), transform 0.7s cubic-bezier(0.16,1,0.3,1); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============================ responsive ============================ */
@media (max-width: 900px) {
  .about__grid, .feature__grid, .contact__grid { grid-template-columns: 1fr; }
  .feature__grid--reverse .feature__media { order: 0; }
  .pillars__grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .obj-list { grid-template-columns: 1fr; }

  .nav__links, .nav__actions .btn { display: none; }
  .nav-toggle { display: grid; place-items: center; width: 42px; height: 42px; border-radius: var(--radius-md); color: var(--color-text); }
  .mobile-menu { display: none; }
  .mobile-menu.open { display: flex; flex-direction: column; gap: var(--space-2); padding: var(--space-4) 0 var(--space-6); border-top: 1px solid var(--color-divider); }
  .mobile-menu a { padding: var(--space-3) 0; font-size: var(--text-base); font-weight: 500; color: var(--color-text); }
  .mobile-menu .btn { margin-top: var(--space-3); }
}

@media (max-width: 560px) {
  .form__row { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .hero__meta-inner { gap: var(--space-5) var(--space-8); }
}