/*
 * ============================================================
 * ANTIOCH CHURCH — SHARED DESIGN SYSTEM
 * main.css
 *
 * This file is imported by every page on the site.
 * It defines the visual language: colours, typography,
 * spacing, shared components (nav, footer, buttons, reveals).
 *
 * Structure:
 *   1. Design tokens (CSS custom properties)
 *   2. Reset & base
 *   3. Typography
 *   4. Shared layout utilities
 *   5. Navigation (shared across all pages)
 *   6. Footer (shared across all pages)
 *   7. Buttons
 *   8. Scroll-reveal animation
 *   9. Page hero (shared pattern)
 *  10. Responsive breakpoints
 * ============================================================
 */


/* ── 1. DESIGN TOKENS ──────────────────────────────────────── */
:root {
  /* Brand colours */
  --gold:       #C8902A;
  --gold-lt:    #E8B86D;
  --gold-pale:  rgba(200, 144, 42, 0.10);
  --gold-glow:  rgba(200, 144, 42, 0.35);

  /* Surface colours */
  --cream:      #FDF9F3;
  --warm:       #F7F0E4;
  --paper:      #FFFCF7;
  --charcoal:   #1E1D1B;
  --mid:        #5C5A55;
  --light:      #9B9790;

  /* Accent */
  --green-dark: #1a2a1a;

  /* Typography stacks */
  --serif:      'Playfair Display', Georgia, serif;
  --zh:         'Noto Serif TC', serif;
  --sans:       'Inter', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs:   8px;
  --space-sm:   16px;
  --space-md:   32px;
  --space-lg:   64px;
  --space-xl:   100px;

  /* Radius */
  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;

  /* Animation */
  --ease:       cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration:   0.45s;
}


/* ── 2. RESET & BASE ───────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--sans);
  background: var(--cream);
  color: var(--charcoal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Images never overflow their container */
img {
  display: block;
  max-width: 100%;
}

/* Links inherit colour by default */
a {
  color: inherit;
  text-decoration: none;
}

/* Buttons reset */
button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* Respect user preference for reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}


/* ── 3. TYPOGRAPHY ─────────────────────────────────────────── */

/*
 * We use three font families:
 *   --serif  : Playfair Display — warm editorial headings (English)
 *   --zh     : Noto Serif TC    — Chinese headings & body
 *   --sans   : Inter            — UI, labels, captions, meta
 *
 * Font size scale uses clamp() for fluid responsive sizing.
 */

.t-eyebrow {
  /* Small all-caps label above section titles */
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--gold);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

/* Decorative rule after the eyebrow label */
.t-eyebrow::after {
  content: '';
  height: 1px;
  width: 50px;
  background: var(--gold);
  opacity: 0.30;
}

.t-h1 {
  /* Page-level hero heading */
  font-family: var(--zh);
  font-size: clamp(42px, 8vw, 88px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: 0.06em;
}

.t-h2 {
  /* Section heading */
  font-family: var(--zh);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 600;
  line-height: 1.15;
  color: var(--charcoal);
  margin-bottom: 8px;
}

.t-h2-sub {
  /* Italic subtitle under section heading */
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(14px, 1.8vw, 20px);
  color: var(--gold);
  opacity: 0.75;
  margin-bottom: 48px;
}

.t-body {
  font-family: var(--zh);
  font-size: 15px;
  line-height: 2.0;
  color: var(--mid);
}

.t-meta {
  /* Small metadata text — dates, speakers, tags */
  font-family: var(--sans);
  font-size: 12px;
  color: var(--light);
}

/* English language overrides */
.lang-en .t-h1   { font-family: var(--serif); letter-spacing: 0.02em; }
.lang-en .t-h2   { font-family: var(--serif); }
.lang-en .t-body { font-family: var(--sans); line-height: 1.8; }


/* ── 4. LAYOUT UTILITIES ───────────────────────────────────── */

/* Centred content container with max-width */
.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Generic section padding */
.section {
  padding: var(--space-xl) 48px;
}

/* Alternate background for section rhythm */
.section--cream  { background: var(--cream); }
.section--warm   { background: var(--warm); }
.section--paper  { background: var(--paper); }
.section--dark   { background: linear-gradient(160deg, #1E1D1B, #2E2B25); color: white; }
.section--green  { background: linear-gradient(135deg, var(--green-dark), #2a3a2a); color: white; }

/* Two-column grid used on multiple pages */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

/* Scripture reference badge */
.scripture-badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 11.5px;
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(200, 144, 42, 0.35);
  color: var(--gold);
}

/* Category / topic tag pill */
.tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--gold-pale);
  color: var(--gold);
  margin-bottom: 12px;
}

.tag--white {
  background: rgba(200, 144, 42, 0.8);
  color: white;
}


/* ── 5. NAVIGATION ─────────────────────────────────────────── */

/*
 * The nav is fixed at the top. It starts transparent (for use
 * over hero images) and gains a frosted-glass background once
 * the user scrolls past 60px. The .scrolled class is toggled
 * by nav.js.
 */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 48px;
  height: 72px;
  transition: background var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}

.nav.scrolled {
  background: rgba(253, 249, 243, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(200, 144, 42, 0.15);
}

/* Logo area */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo img {
  height: 52px;          /* slightly larger now text is removed */
  width: auto;
  /* White over hero images; original colour once nav has background */
  filter: brightness(0) invert(1);
  transition: filter var(--duration) var(--ease);
}

.nav.scrolled .nav-logo img {
  /* Original colour once nav has background */
  filter: none;
}

.nav-logo-zh {
  font-family: var(--zh);
  font-size: 15px;
  font-weight: 600;
  color: white;
  transition: color var(--duration) var(--ease);
}

.nav-logo-en {
  font-family: var(--sans);
  font-size: 10px;
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  transition: color var(--duration) var(--ease);
}

.nav.scrolled .nav-logo-zh { color: var(--charcoal); }
.nav.scrolled .nav-logo-en { color: var(--light); }

/* Nav links list */
.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  font-family: var(--zh);
  font-size: 13px;
  color: rgba(255,255,255,0.88);
  padding: 6px 11px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav.scrolled .nav-links a { color: var(--mid); }

.nav-links a:hover,
.nav-links a.active {
  color: var(--gold) !important;
  background: rgba(200,144,42,0.08);
}

/* Right-side controls */
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language toggle button */
.lang-btn {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 6px 18px;
  border-radius: 20px;
  border: 1.5px solid rgba(255,255,255,0.5);
  color: white;
  transition: all 0.25s;
}

.nav.scrolled .lang-btn {
  border-color: var(--gold);
  color: var(--gold);
}

.lang-btn:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: white !important;
}

/* Facebook icon link */
.nav-fb {
  color: rgba(255,255,255,0.80);
  line-height: 0;
  transition: color 0.2s;
}

.nav.scrolled .nav-fb { color: var(--gold); }
.nav-fb:hover { color: var(--gold-lt) !important; }

/* Hamburger (mobile only, hidden on desktop) */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: white;
  border-radius: 2px;
  transition: all 0.3s;
}

.nav.scrolled .nav-hamburger span { background: var(--charcoal); }

/* Full-screen mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 190;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  padding: 100px 40px 40px;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.mobile-menu.open { transform: none; }

.mobile-menu a {
  font-family: var(--zh);
  font-size: 20px;
  font-weight: 500;
  color: var(--charcoal);
  padding: 14px 0;
  border-bottom: 1px solid rgba(200,144,42,0.10);
  display: block;
  transition: color 0.2s;
}

.mobile-menu a:hover { color: var(--gold); }


/* ── 6. FOOTER ─────────────────────────────────────────────── */

/*
 * Consistent across all 7 pages. Dark background, three columns:
 * brand | navigation | contact + support.
 */

.footer {
  background: #131210;
  color: rgba(255,255,255,0.55);
  padding: 72px 48px 36px;
}

.footer-rule {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin-bottom: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 44px;
  max-width: 1200px;
  margin: 0 auto 56px;
}

.footer-logo img {
  height: 50px;
  width: auto;
  opacity: 0.75;
  margin-bottom: 14px;
  filter: brightness(0) invert(0.65);
}

.footer-brand-zh {
  font-family: var(--zh);
  font-size: 16px;
  font-weight: 600;
  color: rgba(255,255,255,0.75);
  margin-bottom: 6px;
}

.footer-brand-slogan {
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-fb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--gold-lt);
  font-size: 13px;
  font-family: var(--sans);
}

.footer-heading {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-links a {
  font-family: var(--zh);
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--gold-lt); }

.footer-info p {
  font-family: var(--sans);
  font-size: 12.5px;
  color: rgba(255,255,255,0.40);
  line-height: 1.75;
  margin-bottom: 4px;
}

.footer-info a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-bottom {
  text-align: center;
  font-family: var(--sans);
  font-size: 11px;
  color: rgba(255,255,255,0.18);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 28px;
  max-width: 1200px;
  margin: 0 auto;
}


/* ── 7. BUTTONS ────────────────────────────────────────────── */

/* Base button style — add a variant class */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 38px;
  border-radius: 40px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
}

/* Gold filled — primary CTA */
.btn--gold {
  background: var(--gold);
  color: white;
  box-shadow: 0 8px 28px var(--gold-glow);
}

.btn--gold:hover {
  transform: translateY(-2px);
  background: var(--gold-lt);
  box-shadow: 0 14px 40px var(--gold-glow);
}

/* Ghost / outline — secondary CTA */
.btn--ghost {
  border: 1.5px solid rgba(255,255,255,0.50);
  color: white;
  backdrop-filter: blur(8px);
}

.btn--ghost:hover {
  border-color: white;
  background: rgba(255,255,255,0.10);
}

/* Gold outline on light backgrounds */
.btn--outline {
  border: 1.5px solid var(--gold);
  color: var(--gold);
}

.btn--outline:hover {
  background: var(--gold);
  color: white;
}


/* ── 8. SCROLL-REVEAL ──────────────────────────────────────── */

/*
 * Elements with .reveal start hidden and fade+slide in when
 * they enter the viewport. Triggered by IntersectionObserver
 * in js/reveal.js. Direction variants: .from-left, .from-right
 */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.70s ease, transform 0.70s ease;
}

.reveal.from-left  { transform: translateX(-28px); }
.reveal.from-right { transform: translateX(28px); }

/* Once .visible is added by JS, element animates in */
.reveal.visible {
  opacity: 1;
  transform: none;
}


/* ── 9. PAGE HERO ───────────────────────────────────────────── */

/*
 * Shared hero pattern used on inner pages (not the homepage
 * which has its own slideshow hero). A large photograph with
 * a dark overlay and centred text.
 */

.page-hero {
  position: relative;
  height: 60vh;
  min-height: 400px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  padding-top: 72px; /* account for fixed nav */
}

.page-hero__bg {
  position: absolute;
  inset: 0;
}

.page-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* Gradient overlay for text legibility */
.page-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(18,16,12,0.25) 0%,
    rgba(18,16,12,0.65) 100%
  );
}

.page-hero__content {
  position: relative;
  z-index: 1;
  padding: 48px 48px 56px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.page-hero__eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  margin-bottom: 12px;
}

.page-hero__title {
  font-family: var(--zh);
  font-size: clamp(36px, 6vw, 70px);
  font-weight: 600;
  color: white;
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-shadow: 0 4px 20px rgba(0,0,0,0.25);
  margin-bottom: 8px;
}

.page-hero__subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(14px, 2vw, 20px);
  color: rgba(255,255,255,0.75);
}


/* ── 10. RESPONSIVE ────────────────────────────────────────── */

/* Tablet */
@media (max-width: 1024px) {
  .section { padding: 80px 32px; }
  .two-col { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .nav { padding: 0 32px; }
  .page-hero__content { padding: 32px 32px 44px; }
}

/* Mobile */
@media (max-width: 768px) {
  .section { padding: 64px 20px; }
  .nav { padding: 0 20px; }
  .nav-links { display: none; }     /* hidden — use hamburger */
  .nav-hamburger { display: flex; }
  .footer { padding: 56px 24px 28px; }
  .footer-grid { grid-template-columns: 1fr; }
  .page-hero__content { padding: 24px 20px 36px; }
  .btn { padding: 12px 28px; font-size: 13px; }
}