/* ============================================
   Medieval Scholarly System — styles.css
   "Tactile Minimalism" · Living Archive
   ============================================ */

/* --- Google Fonts (loaded in HTML <head>) --- */

/* --- CSS Custom Properties --- */
:root {
  /* Surface tones */
  --surface:                 #fcf9ee;
  --surface-dim:             #dddacf;
  --surface-bright:          #fcf9ee;
  --surface-container-lowest:#ffffff;
  --surface-container-low:   #f7f4e9;
  --surface-container:       #f1eee3;
  --surface-container-high:  #ebe8dd;
  --surface-container-highest:#e5e2d8;
  --on-surface:              #1c1c15;
  --on-surface-variant:      #43474c;

  /* Primary – Deep Ink Blue */
  --primary:                 #001022;
  --on-primary:              #ffffff;
  --primary-container:       #12263a;
  --on-primary-container:    #7a8ea6;

  /* Secondary – Antique Gold */
  --secondary:               #7b5811;
  --on-secondary:            #ffffff;
  --secondary-container:     #fdcd7c;
  --on-secondary-container:  #78550e;

  /* Tertiary – Oxblood Red */
  --tertiary:                #2a0001;
  --tertiary-container:      #520105;
  --on-tertiary-container:   #dc695f;

  /* Utility */
  --outline:                 #74777d;
  --outline-variant:         #c4c6cd;
  --surface-tint:            #4d6076;

  /* Radii */
  --radius-sm:   0.125rem;
  --radius:      0.25rem;
  --radius-md:   0.375rem;
  --radius-lg:   0.5rem;
  --radius-xl:   0.75rem;
  --radius-full: 9999px;

  /* Spacing */
  --unit:          8px;
  --container-max: 1140px;
  --gutter:        32px;
  --margin:        48px;
  --stack-sm:      16px;
  --stack-md:      32px;
  --stack-lg:      64px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Newsreader', Georgia, 'Times New Roman', serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--on-surface);
  background-color: var(--surface);
  background-image: url("data:image/svg+xml,%3Csvg width='200' height='200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--secondary);
  text-decoration: none;
  transition: color 0.25s ease;
}
a:hover {
  color: var(--on-secondary-container);
}

ul { list-style: none; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: 'Noto Serif', 'Georgia', serif;
  color: var(--primary);
}

h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
h2 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.2;
}
h3 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
}
.body-lg {
  font-size: 18px;
  line-height: 1.6;
}
.label-sm {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* --- Layout Container --- */
.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--margin);
  padding-right: var(--margin);
}

/* --- Decorative Separator (fleur-de-lis style) --- */
.separator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: var(--stack-md) 0;
}
.separator::before,
.separator::after {
  content: '';
  flex: 1;
  max-width: 80px;
  height: 0.5px;
  background: var(--secondary);
}
.separator-icon {
  color: var(--secondary);
  font-size: 20px;
  line-height: 1;
}

/* --- Top Navigation Bar --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px var(--margin);
  background: rgba(252, 249, 238, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 0.5px solid rgba(0, 16, 34, 0.12);
  font-family: 'Noto Serif', Georgia, serif;
}
.site-nav .nav-brand {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}
.site-nav nav {
  display: flex;
  gap: var(--stack-md);
  align-items: center;
}
.site-nav nav a {
  font-size: 14px;
  color: var(--on-surface-variant);
  transition: color 0.25s ease;
}
.site-nav nav a:hover {
  color: var(--primary);
}
.site-nav nav a.active {
  color: var(--secondary);
  border-bottom: 2px solid var(--secondary);
  padding-bottom: 2px;
  font-weight: 600;
}

/* --- Buttons --- */
.btn-primary {
  display: inline-block;
  background: var(--primary-container);
  color: var(--on-primary);
  font-family: 'Newsreader', Georgia, serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 36px;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn-primary:hover {
  transform: scale(0.97);
  color: var(--on-primary);
  box-shadow: 0 4px 16px rgba(0,16,34,0.25);
}

.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--secondary);
  font-family: 'Newsreader', Georgia, serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 36px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--secondary);
  cursor: pointer;
  transition: background 0.25s ease;
}
.btn-ghost:hover {
  background: rgba(123, 88, 17, 0.08);
  color: var(--secondary);
}

/* Wax Seal Button (register CTA) */
.btn-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: radial-gradient(circle at 30% 30%, #a02020, #520105);
  color: #fff;
  font-family: 'Newsreader', Georgia, serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 18px 48px;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow:
    inset 0 2px 4px rgba(255,255,255,0.2),
    0 4px 12px rgba(0,0,0,0.3);
  transition: transform 0.25s ease;
}
.btn-seal:hover {
  transform: scale(1.04);
  color: #fff;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--primary);
  margin-top: 56px; /* nav height offset */
}
.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, var(--primary) 30%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}
.hero .label-sm {
  color: var(--secondary-container);
  margin-bottom: 16px;
  display: block;
  letter-spacing: 0.2em;
}
.hero h1 {
  color: #fff;
  margin-bottom: 24px;
}
.hero .hero-subtitle {
  font-size: 18px;
  line-height: 1.6;
  color: var(--on-primary-container);
  margin-bottom: var(--stack-md);
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Introduction / Description --- */
.intro {
  padding: var(--stack-lg) 0;
  background: var(--surface-bright);
  text-align: center;
}
.intro p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--on-surface-variant);
  font-style: italic;
  max-width: 720px;
  margin: 0 auto;
}

/* --- Program Schedule Section --- */
.program {
  padding: var(--stack-lg) 0;
  background: var(--surface);
}
.program-header {
  text-align: center;
  margin-bottom: var(--stack-lg);
}
.program-header h2 {
  margin-bottom: 8px;
}
.program-header .label-sm {
  color: var(--secondary);
}

/* Day grid */
.days-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gutter);
}

/* Day column */
.day-column {
  display: flex;
  flex-direction: column;
  gap: var(--stack-sm);
}
.day-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.day-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.day-icon.thursday { background: var(--primary); color: var(--on-primary); }
.day-icon.friday   { background: var(--secondary); color: var(--on-secondary); }

/* Session cards */
.session-card {
  background: var(--surface-container-low);
  padding: 24px;
  border-left: 4px solid var(--secondary);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  transition: box-shadow 0.25s ease;
}
.session-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.session-card.accent-primary   { border-left-color: var(--primary); }
.session-card.accent-tertiary  { border-left-color: var(--tertiary-container); }
.session-card.accent-gold      { border-left-color: var(--secondary-container); }

.session-time {
  display: block;
  margin-bottom: 8px;
}
.session-card h3 {
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--on-surface);
}

/* Speaker entries */
.speaker-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.speaker {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.speaker-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--surface-container-high);
  color: var(--outline);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  margin-top: 2px;
}
.speaker-name {
  font-weight: 600;
  color: var(--primary);
  font-size: 16px;
}
.speaker-affiliation {
  font-size: 13px;
  color: var(--on-surface-variant);
  letter-spacing: 0.02em;
}
.speaker-title {
  font-size: 14px;
  line-height: 1.5;
  color: var(--on-surface-variant);
  font-style: italic;
  margin-top: 2px;
}

/* Break / coffee blocks */
.break-block {
  padding: 12px 24px;
  color: var(--outline);
  font-size: 14px;
  font-style: italic;
  border-left: 4px solid transparent;
}

/* --- Registration CTA --- */
.registration-cta {
  padding: var(--stack-lg) 0;
  background: var(--primary-container);
  text-align: center;
}
.registration-cta h2 {
  color: var(--on-primary);
  margin-bottom: 16px;
}
.registration-cta p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--on-primary-container);
  max-width: 560px;
  margin: 0 auto var(--stack-md);
}
.registration-cta .label-sm {
  color: var(--on-primary-container);
  opacity: 0.6;
  margin-top: 16px;
  display: block;
}

/* --- Contact Section --- */
.contact {
  padding: var(--stack-lg) 0;
  background: var(--surface-container-high);
}
.contact-card {
  background: var(--surface-container-lowest);
  padding: var(--margin);
  border-radius: var(--radius-xl);
  border: 1px solid var(--outline-variant);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  max-width: 680px;
  margin: 0 auto;
}
.contact-header {
  margin-bottom: var(--stack-md);
}
.contact-header h3 {
  margin-bottom: 12px;
}
.contact-intro {
  color: var(--on-surface-variant);
  font-size: 16px;
  line-height: 1.5;
}

/* --- Contact Form Styling --- */
.contact-form {
  margin-bottom: var(--stack-md);
}

.form-group {
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
  display: block;
}

.form-group input,
.form-group textarea {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--on-surface);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--outline-variant);
  padding: 12px 0;
  transition: border-color 0.25s ease, color 0.25s ease;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--outline);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--secondary);
  color: var(--on-surface);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Focus ring for accessibility */
.form-group input:focus,
.form-group textarea:focus {
  box-shadow: 0 1px 0 var(--secondary);
}

/* --- Contact Form Submit --- */
.contact-form .btn-seal {
  margin-top: var(--stack-md);
  width: 100%;
  justify-content: center;
}

/* --- Contact Divider --- */
.contact-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--stack-md) 0;
}

.contact-divider .separator-icon {
  color: var(--secondary);
  font-size: 18px;
}

/* --- Contact Info Section --- */
.contact-info {
  text-align: center;
}

.contact-info-label {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 16px;
  display: block;
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  justify-content: center;
}
.contact-detail-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--surface-container-highest);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 20px;
  flex-shrink: 0;
}
.contact-detail .label-sm {
  color: var(--secondary);
  margin-bottom: 4px;
  display: block;
}
.contact-detail-value {
  font-weight: 700;
  color: var(--primary);
}

/* --- Footer --- */
.site-footer {
  padding: var(--stack-md) 0;
  background: var(--surface-container);
  border-top: 0.5px solid rgba(0,16,34,0.08);
  text-align: center;
}
.sponsors-label {
  margin-bottom: 20px;
}
.sponsors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--stack-md);
  opacity: 0.7;
  margin-bottom: 24px;
}
.sponsors span {
  font-family: 'Noto Serif', Georgia, serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.01em;
}
.site-footer .copyright {
  font-size: 13px;
  color: var(--outline);
  font-style: italic;
}

/* --- Floating Action Button (The Seal) --- */
.fab-seal {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 100;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #a02020, #520105);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  box-shadow:
    inset 0 2px 4px rgba(255,255,255,0.2),
    0 6px 20px rgba(82,1,5,0.45);
  transition: transform 0.3s ease;
}
.fab-seal:hover {
  transform: scale(1.1);
}

/* --- Deckle Edge (bottom of certain cards) --- */
.deckle-edge {
  border-bottom: 3px solid transparent;
  border-image: url("data:image/svg+xml,%3Csvg width='100' height='3' viewBox='0 0 100 3' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 1.5C5 0.5 10 2.5 15 1.5C20 0.5 25 2.5 30 1.5C35 0.5 40 2.5 45 1.5C50 0.5 55 2.5 60 1.5C65 0.5 70 2.5 75 1.5C80 0.5 85 2.5 90 1.5C95 0.5 100 2.5 105 1.5' stroke='%237b5811' stroke-width='0.5'/%3E%3C/svg%3E") 30 stretch;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.animate-in {
  animation: fadeInUp 0.6s ease-out both;
}
.animate-delay-1 { animation-delay: 0.15s; }
.animate-delay-2 { animation-delay: 0.3s; }
.animate-delay-3 { animation-delay: 0.45s; }

/* --- Responsive --- */
@media (max-width: 860px) {
  h1 { font-size: 36px; }
  h2 { font-size: 26px; }

  .container {
    padding-left: 24px;
    padding-right: 24px;
  }

  .days-grid {
    grid-template-columns: 1fr;
  }

  .site-nav nav {
    display: none;
  }

  .hero {
    min-height: 60vh;
  }
  .hero-content {
    max-width: 100%;
  }

  .contact-card {
    padding: 32px 24px;
  }

  .form-group {
    margin-bottom: 24px;
  }

  .form-group label {
    font-size: 12px;
  }

  .form-group input,
  .form-group textarea {
    font-size: 16px; /* Prevents zoom on iOS */
  }

  .contact-detail {
    flex-direction: column;
    text-align: center;
  }
}
