/* ================================================
   SHETLAND TIMELINE — Design System
   Palette: Norse sea — deep navy, aged parchment, 
   Viking gold, storm grey
   ================================================ */

:root, [data-theme="light"] {
  /* Surfaces — parchment */
  --color-bg:              #f4f0e8;
  --color-surface:         #f8f5ef;
  --color-surface-2:       #faf8f4;
  --color-surface-offset:  #ede8dc;
  --color-divider:         #d6cfbe;
  --color-border:          #c8c0ac;

  /* Text */
  --color-text:            #1e1a12;
  --color-text-muted:      #6b6255;
  --color-text-faint:      #a89d8c;
  --color-text-inverse:    #f4f0e8;

  /* Accents */
  --color-primary:         #1a3a5c;  /* deep Norse blue */
  --color-primary-hover:   #122a44;
  --color-gold:            #b8892a;  /* Viking gold */
  --color-gold-light:      #e8c87a;
  --color-storm:           #5a6e7f;  /* storm grey */
  --color-crimson:         #8b2020;  /* battle red */

  /* Category colors */
  --cat-politico:          #1a3a5c;
  --cat-commercio:         #2d6b3f;
  --cat-legge:             #6b3d1a;
  --cat-guerra:            #8b2020;

  /* 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;

  /* Type */
  --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);

  /* Fonts */
  --font-display: 'Cinzel', 'Palatino Linotype', serif;
  --font-body:    'Crimson Pro', 'Georgia', serif;

  /* Radii & transitions */
  --radius-sm: 0.25rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(30,26,18,0.08);
  --shadow-md: 0 4px 16px rgba(30,26,18,0.10);
  --shadow-lg: 0 12px 40px rgba(30,26,18,0.14);

  /* Content */
  --content-default: 1100px;
}

[data-theme="dark"] {
  --color-bg:              #0d1520;
  --color-surface:         #111d2e;
  --color-surface-2:       #152236;
  --color-surface-offset:  #0a1019;
  --color-divider:         #1e2e42;
  --color-border:          #253648;
  --color-text:            #ddd5c5;
  --color-text-muted:      #8a9aaa;
  --color-text-faint:      #4a5a6a;
  --color-text-inverse:    #0d1520;
  --color-primary:         #4a88c8;
  --color-primary-hover:   #6aa0d8;
  --color-gold:            #d4a843;
  --color-gold-light:      #f0cc7e;
  --color-storm:           #7a92a8;
  --color-crimson:         #c04040;
  --cat-politico:          #4a88c8;
  --cat-commercio:         #4aac6a;
  --cat-legge:             #d4883a;
  --cat-guerra:            #c04040;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0d1520; --color-surface: #111d2e; --color-surface-2: #152236;
    --color-surface-offset: #0a1019; --color-divider: #1e2e42; --color-border: #253648;
    --color-text: #ddd5c5; --color-text-muted: #8a9aaa; --color-text-faint: #4a5a6a;
    --color-text-inverse: #0d1520; --color-primary: #4a88c8; --color-primary-hover: #6aa0d8;
    --color-gold: #d4a843; --color-gold-light: #f0cc7e; --color-storm: #7a92a8;
    --color-crimson: #c04040;
    --cat-politico: #4a88c8; --cat-commercio: #4aac6a; --cat-legge: #d4883a; --cat-guerra: #c04040;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3); --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  }
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Subtle texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--color-primary); transition: color var(--transition); }
a:hover { color: var(--color-primary-hover); }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
h1, h2, h3 { font-family: var(--font-display); text-wrap: balance; line-height: 1.2; }

/* ======== HEADER ======== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
}
.logo-wrap:hover {
  opacity: 0.85;
  text-decoration: none;
}

.logo-svg {
  width: 40px;
  height: 40px;
  color: var(--color-gold);
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.logo-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: 0.04em;
}

.logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.filter-pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.pill {
  padding: var(--space-1) var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: 9999px;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: transparent;
  transition: all var(--transition);
}

.pill:hover { border-color: var(--color-primary); color: var(--color-primary); }

.pill.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

/* ======== LANG SWITCH ======== */
.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  border: 1.5px solid var(--color-border);
  border-radius: 9999px;
  padding: 2px var(--space-2);
  background: transparent;
}

.lang-btn {
  font-size: var(--text-xs);
  font-family: var(--font-body);
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 2px var(--space-2);
  border-radius: 9999px;
  transition: all var(--transition);
  cursor: pointer;
  line-height: 1;
}

.lang-btn.active {
  background: var(--color-gold);
  color: var(--color-text-inverse);
  font-weight: 600;
}

.lang-btn:hover:not(.active) {
  color: var(--color-gold);
}

.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--color-gold); color: var(--color-gold); }

.hero-bar {
  border-top: 1px solid var(--color-divider);
  background: linear-gradient(to right, var(--color-surface-offset), var(--color-surface));
  padding: var(--space-2) var(--space-6);
  text-align: center;
}

.hero-tagline {
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 72ch;
  margin: 0 auto;
}

/* ======== STAT STRIP ======== */
.stat-strip {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0;
  padding: var(--space-4) var(--space-6);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 var(--space-8);
}

.stat-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-gold-light);
  line-height: 1;
}

.stat-label {
  font-size: var(--text-xs);
  opacity: 0.8;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: var(--space-1);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.2);
}

/* ======== TIMELINE LAYOUT ======== */
.timeline-container {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6);
  position: relative;
}

/* Central axis */
.timeline-axis {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom,
    transparent,
    var(--color-gold) 5%,
    var(--color-gold) 95%,
    transparent
  );
  transform: translateX(-50%);
  opacity: 0.4;
}

.timeline-events {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

/* ======== EVENT CARD ======== */
.event-card {
  display: grid;
  grid-template-columns: 1fr 48px 1fr;
  align-items: start;
  gap: 0;
  opacity: 1;
  transition: opacity var(--transition), transform var(--transition);
}

.event-card.hidden {
  display: none;
}

/* Connector (center column) */
.event-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: var(--space-5);
  position: relative;
  z-index: 2;
}

.event-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 2px currentColor, var(--shadow-sm);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.event-dot.large {
  width: 20px;
  height: 20px;
  box-shadow: 0 0 0 3px currentColor, 0 0 16px currentColor, var(--shadow-md);
}

.event-dot.politico  { background: var(--cat-politico);  color: var(--cat-politico); }
.event-dot.commercio { background: var(--cat-commercio); color: var(--cat-commercio); }
.event-dot.legge     { background: var(--cat-legge);     color: var(--cat-legge); }
.event-dot.guerra    { background: var(--cat-guerra);    color: var(--cat-guerra); }

.event-card:hover .event-dot {
  transform: scale(1.3);
}

/* Content columns */
.event-content {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
}

.event-content:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-gold);
  transform: translateY(-2px);
}

/* Left: occupies col 1, right: occupies col 3 */
.event-content.left  { grid-column: 1; grid-row: 1; margin-right: var(--space-6); }
.event-content.right { grid-column: 3; grid-row: 1; margin-left: var(--space-6); }

/* Arrow toward center axis */
.event-content.left::after {
  content: '';
  position: absolute;
  right: calc(-1 * var(--space-3));
  top: var(--space-5);
  border: 7px solid transparent;
  border-left-color: var(--color-border);
}
.event-content.left::before {
  content: '';
  position: absolute;
  right: calc(-1 * var(--space-3) + 1px);
  top: var(--space-5);
  border: 7px solid transparent;
  border-left-color: var(--color-surface);
  z-index: 1;
}

.event-content.right::after {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-3));
  top: var(--space-5);
  border: 7px solid transparent;
  border-right-color: var(--color-border);
}
.event-content.right::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-3) + 1px);
  top: var(--space-5);
  border: 7px solid transparent;
  border-right-color: var(--color-surface);
  z-index: 1;
}

/* Highlighted events */
.event-card.highlight .event-content {
  background: var(--color-surface-2);
  border-color: var(--color-gold);
  border-width: 2px;
}

.event-card.highlight .event-content::after {
  border-left-color: var(--color-gold);
  border-right-color: var(--color-gold);
}

.event-card.major .event-content {
  background: color-mix(in oklab, var(--color-primary) 8%, var(--color-surface-2));
  border-color: var(--color-primary);
  border-width: 2px;
}

.event-card.major .event-content::after {
  border-left-color: var(--color-primary);
  border-right-color: var(--color-primary);
}

/* ======== EVENT CONTENT INTERNALS ======== */
.event-year {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.03em;
  margin-bottom: var(--space-1);
}

.event-tag {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.event-tag.politico  { background: color-mix(in oklab, var(--cat-politico)  20%, transparent); color: var(--cat-politico); }
.event-tag.commercio { background: color-mix(in oklab, var(--cat-commercio) 20%, transparent); color: var(--cat-commercio); }
.event-tag.legge     { background: color-mix(in oklab, var(--cat-legge)     20%, transparent); color: var(--cat-legge); }
.event-tag.guerra    { background: color-mix(in oklab, var(--cat-guerra)    20%, transparent); color: var(--cat-guerra); }

[data-theme="dark"] .event-tag.politico  { background: color-mix(in oklab, var(--cat-politico)  15%, transparent); }
[data-theme="dark"] .event-tag.commercio { background: color-mix(in oklab, var(--cat-commercio) 15%, transparent); }
[data-theme="dark"] .event-tag.legge     { background: color-mix(in oklab, var(--cat-legge)     15%, transparent); }
[data-theme="dark"] .event-tag.guerra    { background: color-mix(in oklab, var(--cat-guerra)    15%, transparent); }

.event-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.event-body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 60ch;
}

.event-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.event-body em {
  font-style: italic;
  color: var(--color-text);
}

.event-highlight-box {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: color-mix(in oklab, var(--color-gold) 8%, var(--color-surface-offset));
  border-left: 3px solid var(--color-gold);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  position: relative;
}

.major-box {
  background: color-mix(in oklab, var(--color-primary) 10%, var(--color-surface-offset));
  border-left-color: var(--color-primary);
}

.quote-mark {
  font-family: var(--font-display);
  font-size: 3rem;
  line-height: 0;
  color: var(--color-gold);
  opacity: 0.4;
  display: block;
  height: 1rem;
  margin-bottom: var(--space-2);
}

.event-highlight-box p {
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 55ch;
}

.event-highlight-box cite {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.03em;
}

.event-meta {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
}

.meta-loc {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.03em;
}

/* ======== FOOTER ======== */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface-offset);
  padding: var(--space-8) var(--space-6);
}

.footer-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-note a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-note a:hover { color: var(--color-primary); }

.footer-credit {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
}

/* ======== RESPONSIVE ======== */
@media (max-width: 700px) {
  .event-card {
    grid-template-columns: 24px 1fr;
    grid-template-rows: auto;
  }

  .event-connector {
    grid-column: 1;
    grid-row: 1;
    padding-top: var(--space-4);
    align-items: flex-start;
  }

  .event-content.left,
  .event-content.right {
    grid-column: 2;
    grid-row: 1;
    margin: 0;
    margin-left: var(--space-3);
  }

  .event-content.left::after,
  .event-content.left::before,
  .event-content.right::after,
  .event-content.right::before { display: none; }

  .timeline-axis { left: 12px; }

  .header-inner { padding: var(--space-3) var(--space-4); }
  .filter-pills { gap: var(--space-1); }
  .pill { font-size: 0.7rem; padding: 2px var(--space-2); }

  .stat-strip { gap: var(--space-4); }
  .stat-item { padding: 0 var(--space-4); }
  .stat-divider { display: none; }

  .logo-sub { display: none; }
}

@media (max-width: 480px) {
  .timeline-container { padding: var(--space-8) var(--space-4); }
  .logo-title { font-size: var(--text-base); }
}

/* ======== ANIMATIONS ======== */
@media (prefers-reduced-motion: no-preference) {
  .event-card {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .event-card.visible {
    opacity: 1;
    transform: translateY(0);
  }
  .event-card.hidden {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .event-card { opacity: 1; transform: none; }
}

/* ======== ORNAMENTAL RUNE DIVIDER ======== */
.timeline-events > .event-card:nth-child(9)::after {
  content: '✦ 1450 · Turning Point ✦';
  display: block;
  grid-column: 1 / -1;
  text-align: center;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  color: var(--color-gold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: var(--space-6) 0 var(--space-2);
  opacity: 0.6;
  width: 100%;
}
:lang(it) .timeline-events > .event-card:nth-child(9)::after {
  content: '✦ 1450 · Punto di svolta ✦';
}