/* ================================================
   VEDIC CHANTS & YAGYAS — Design Tokens & Styles
   Art Direction: Warm, spiritual, organic
   Palette: Saffron gold + deep earth tones
   ================================================ */

/* --- Type Scale --- */
:root {
  --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);

  /* --- 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;

  /* --- Transitions --- */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* --- Content Widths --- */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* --- Fonts --- */
  --font-display: 'Zodiak', 'Georgia', serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

/* ================================================
   LIGHT MODE (Default) — Warm saffron & cream
   ================================================ */
:root,
[data-theme='light'] {
  --color-bg: #FBF7F0;
  --color-surface: #FFF9F0;
  --color-surface-2: #FFFDFB;
  --color-surface-offset: #F5EDE0;
  --color-border: #D9CEBC;
  --color-divider: #E6DDD0;

  --color-text: #2C1810;
  --color-text-muted: #7A6B5D;
  --color-text-faint: #B8A99A;
  --color-text-inverse: #FBF7F0;

  --color-primary: #B8610A;
  --color-primary-hover: #8E4A06;
  --color-primary-active: #6D3804;
  --color-primary-highlight: #F5E6D0;

  --color-accent: #C4451C;
  --color-accent-hover: #A03818;

  --color-success: #437A22;

  --shadow-sm: 0 1px 2px oklch(0.25 0.03 60 / 0.08);
  --shadow-md: 0 4px 12px oklch(0.25 0.03 60 / 0.1);
  --shadow-lg: 0 12px 32px oklch(0.25 0.03 60 / 0.14);
}

/* ================================================
   DARK MODE — Deep warm earth
   ================================================ */
[data-theme='dark'] {
  --color-bg: #1A1410;
  --color-surface: #221B14;
  --color-surface-2: #2A221A;
  --color-surface-offset: #1E1812;
  --color-border: #3D3228;
  --color-divider: #302820;

  --color-text: #E8DED0;
  --color-text-muted: #9A8B7A;
  --color-text-faint: #6A5E52;
  --color-text-inverse: #1A1410;

  --color-primary: #D4913E;
  --color-primary-hover: #E8A24E;
  --color-primary-active: #F0B560;
  --color-primary-highlight: #352A1E;

  --color-accent: #E0654A;
  --color-accent-hover: #EB7A62;

  --color-success: #6DAA45;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #1A1410;
    --color-surface: #221B14;
    --color-surface-2: #2A221A;
    --color-surface-offset: #1E1812;
    --color-border: #3D3228;
    --color-divider: #302820;
    --color-text: #E8DED0;
    --color-text-muted: #9A8B7A;
    --color-text-faint: #6A5E52;
    --color-text-inverse: #1A1410;
    --color-primary: #D4913E;
    --color-primary-hover: #E8A24E;
    --color-primary-active: #F0B560;
    --color-primary-highlight: #352A1E;
    --color-accent: #E0654A;
    --color-accent-hover: #EB7A62;
    --color-success: #6DAA45;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
  }
}

/* ================================================
   LAYOUT
   ================================================ */
.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.container--wide {
  max-width: var(--content-wide);
}
.container--narrow {
  max-width: var(--content-narrow);
}

/* ================================================
   HEADER / NAV
   ================================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s var(--ease-out);
}
.header--scrolled {
  box-shadow: var(--shadow-sm);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}
.header__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.header__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-interactive);
}
.header__nav a:hover {
  color: var(--color-primary);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  top: 56px;
  background: var(--color-bg);
  z-index: 49;
  padding: var(--space-8) var(--space-4);
  flex-direction: column;
  gap: var(--space-6);
}
.mobile-nav.open {
  display: flex;
}
.mobile-nav a {
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-divider);
}
@media (max-width: 767px) {
  .header__nav {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
}

/* ================================================
   HERO
   ================================================ */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    oklch(0.15 0.02 40 / 0.5) 0%,
    oklch(0.12 0.03 40 / 0.75) 50%,
    oklch(0.1 0.03 40 / 0.9) 100%
  );
}
.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-16) var(--space-4);
  max-width: 800px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  background: oklch(1 0 0 / 0.12);
  backdrop-filter: blur(8px);
  color: #F5DEB3;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}
.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  color: #FFF9F0;
  margin-bottom: var(--space-4);
  line-height: 1.1;
}
.hero__subtitle {
  font-size: var(--text-base);
  color: #D4C8B8;
  margin-bottom: var(--space-8);
  max-width: 52ch;
  margin-inline: auto;
  line-height: 1.7;
}
.hero__date {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
  color: #E8DED0;
  font-size: var(--text-sm);
  font-weight: 500;
}
.hero__date-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: #FFF9F0;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.hero__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px oklch(0.3 0.1 60 / 0.3);
}
.hero__cta:active {
  transform: translateY(0);
}

/* ================================================
   SECTION COMMON
   ================================================ */
.section {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-4);
}
.section--alt {
  background: var(--color-surface);
}
.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}
.section__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}
.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 56ch;
  margin-inline: auto;
}

/* ================================================
   ABOUT — Asymmetric two-column
   ================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
  max-width: var(--content-wide);
  margin-inline: auto;
}
@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr 1.1fr;
    gap: var(--space-12);
  }
}
.about__image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
}
.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.about__text h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}
.about__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}
.about__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.about__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}
.about__feature-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 2px;
}
.about__feature span {
  font-size: var(--text-sm);
  font-weight: 500;
}

/* ================================================
   AGENDA — Timeline-style
   ================================================ */
.agenda__timeline {
  max-width: 700px;
  margin-inline: auto;
  position: relative;
}
.agenda__timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-divider);
}
@media (min-width: 768px) {
  .agenda__timeline::before {
    left: 32px;
  }
}
.agenda__item {
  position: relative;
  padding-left: 60px;
  margin-bottom: var(--space-8);
}
@media (min-width: 768px) {
  .agenda__item {
    padding-left: 80px;
  }
}
.agenda__item::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
}
@media (min-width: 768px) {
  .agenda__item::before {
    left: 26px;
  }
}
.section--alt .agenda__item::before {
  border-color: var(--color-surface);
}
.agenda__time {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
}
.agenda__item-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  margin-bottom: var(--space-2);
}
.agenda__item-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.agenda__item-speaker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
}

/* Editable agenda notice */
.agenda__edit-notice {
  text-align: center;
  margin-top: var(--space-8);
  padding: var(--space-4);
  background: var(--color-primary-highlight);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.agenda__edit-notice strong {
  color: var(--color-primary);
}

/* ================================================
   LIVESTREAM EMBED
   ================================================ */
.livestream__wrapper {
  max-width: 800px;
  margin-inline: auto;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}
.livestream__embed {
  position: relative;
  padding-top: 56.25%;
  background: #000;
}
.livestream__embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.livestream__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  color: #A09080;
  text-align: center;
  padding: var(--space-4);
}
.livestream__placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.6;
}
.livestream__placeholder p {
  font-size: var(--text-sm);
}
.livestream__info {
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.livestream__status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
}
.livestream__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-text-faint);
}
.livestream__dot--live {
  background: #E04040;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ================================================
   REGISTRATION FORM
   ================================================ */
.registration__card {
  max-width: 560px;
  margin-inline: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}
@media (max-width: 767px) {
  .registration__card {
    padding: var(--space-6);
  }
}
.form__group {
  margin-bottom: var(--space-5);
}
.form__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}
.form__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  font-size: var(--text-base);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.form__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}
.form__input::placeholder {
  color: var(--color-text-faint);
}
.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
@media (max-width: 480px) {
  .form__row {
    grid-template-columns: 1fr;
  }
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}
.form__note {
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-4);
}

/* Success message */
.form__success {
  display: none;
  text-align: center;
  padding: var(--space-8);
}
.form__success.show {
  display: block;
}
.form__success svg {
  width: 48px;
  height: 48px;
  color: var(--color-success);
  margin-inline: auto;
  margin-bottom: var(--space-4);
}
.form__success h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}
.form__success p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-inline: auto;
}

/* ================================================
   SHARE
   ================================================ */
.share__card {
  max-width: 560px;
  margin-inline: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-align: center;
}
.share__url-row {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
  margin-bottom: var(--space-4);
}
.share__url-input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  font-size: var(--text-sm);
  color: var(--color-text);
  font-family: monospace;
}
.btn-copy {
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  transition: background var(--transition-interactive);
}
.btn-copy:hover {
  background: var(--color-primary-hover);
}
.btn-copy.copied {
  background: var(--color-success);
}
.share__socials {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}
.share__social-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background var(--transition-interactive), color var(--transition-interactive), transform var(--transition-interactive);
}
.share__social-btn:hover {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ================================================
   FOOTER
   ================================================ */
.footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}
.footer a {
  color: var(--color-primary);
  text-decoration: none;
}
.footer a:hover {
  text-decoration: underline;
}

/* ================================================
   SCROLL ANIMATIONS
   ================================================ */
.fade-in {
  opacity: 1;
}
@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}
@keyframes reveal-fade {
  to { opacity: 1; }
}

/* ================================================
   COUNTDOWN
   ================================================ */
.countdown {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.countdown__unit {
  text-align: center;
}
.countdown__number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  color: #FFF9F0;
  display: block;
  font-variant-numeric: tabular-nums;
}
.countdown__label {
  font-size: var(--text-xs);
  color: #A09080;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ================================================
   DECORATIVE OM SYMBOL
   ================================================ */
.om-divider {
  text-align: center;
  padding: var(--space-4) 0;
  color: var(--color-primary);
  opacity: 0.3;
  font-size: 28px;
}