@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,500;0,600;0,700;1,500&family=Source+Sans+3:wght@400;500;600;700&display=swap');

:root {
  --alpine-950: #162f24;
  --alpine-900: #1f4234;
  --alpine-bottom: #1e3630;
  --walnut-900: #3d2518;
  --walnut-800: #4f3020;
  --walnut-700: #6a4432;
  --walnut-600: #8a5c42;
  --parchment-50: #faf6ee;
  --parchment-100: #f3ead8;
  --parchment-200: #e8d9bc;
  --parchment-300: #d9c49a;
  --brass-300: #d4b87a;
  --brass-400: #c9a45c;
  --brass-500: #b8923f;
  --brass-600: #9a7a32;
  --felt-700: #2a7a52;
  --felt-800: #226648;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  height: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  color: var(--parchment-100);
  background-color: var(--alpine-950);
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(58, 112, 88, 0.28) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 100%, rgba(106, 68, 50, 0.2) 0%, transparent 50%),
    linear-gradient(180deg, var(--alpine-950) 0%, var(--alpine-bottom) 100%);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brass-300);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--brass-400);
}

/* Header */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background-color: var(--walnut-800);
  background-image:
    repeating-linear-gradient(92deg, transparent, transparent 2px, rgba(0, 0, 0, 0.03) 2px, rgba(0, 0, 0, 0.03) 4px),
    linear-gradient(180deg, var(--walnut-600) 0%, var(--walnut-800) 100%);
  border-bottom: 1px solid rgba(201, 164, 92, 0.3);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.22);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-header__brand img {
  height: 2.25rem;
  width: auto;
}

.site-header__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--brass-300);
  letter-spacing: 0.02em;
}

.site-header__back {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border-radius: 0.375rem;
  border: 1px solid rgba(201, 164, 92, 0.35);
  background: rgba(255, 255, 255, 0.04);
}

.site-header__back:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* Main slide deck */

.rules-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-top: 4.5rem;
  padding-bottom: 1rem;
}

.slide {
  display: none;
  flex: 1;
  padding: 2rem 1.25rem 2rem;
  animation: slideIn 0.45s ease-out;
}

.slide.is-active {
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide__inner {
  width: 100%;
  max-width: 56rem;
  margin: 0 auto;
}

.slide__inner--split {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 768px) {
  .slide__inner--split {
    grid-template-columns: 1fr 1.1fr;
  }
}

/* Parchment panel */

.panel {
  position: relative;
  padding: 2rem 2.25rem 3.5rem;
  border-radius: 0.75rem;
  background: var(--parchment-100);
  color: var(--walnut-900);
  border: 1px solid rgba(201, 164, 92, 0.45);
  background-image: linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0%, transparent 50%, rgba(0, 0, 0, 0.03) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    0 0 0 1px var(--brass-600),
    0 0 0 3px rgba(201, 164, 92, 0.2),
    0 12px 40px rgba(0, 0, 0, 0.18);
}

.panel::before {
  content: '';
  position: absolute;
  inset: 0.5rem;
  border: 1px solid rgba(184, 146, 63, 0.15);
  border-radius: 0.5rem;
  pointer-events: none;
}

.panel h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--walnut-900);
  text-transform: lowercase;
}

.panel p {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--walnut-800);
}

.panel p:last-of-type {
  margin-bottom: 0;
}

.hint {
  font-weight: 700;
  color: var(--walnut-900);
  background: linear-gradient(180deg, transparent 60%, rgba(201, 164, 92, 0.35) 60%);
}

/* Buttons */

.panel__actions {
  position: absolute;
  left: 1.5rem;
  right: 1.5rem;
  bottom: -1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.panel__actions--forward-only {
  justify-content: flex-end;
}

.panel__actions--back-only {
  justify-content: flex-start;
}

.panel__actions:not(.panel__actions--back-only) .btn-forward {
  margin-left: auto;
}

.btn-back,
.btn-forward {
  padding: 0.65rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-radius: 0.5rem;
  transition: transform 0.15s, filter 0.15s, opacity 0.15s;
}

.btn-back {
  color: var(--walnut-800);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(92, 58, 42, 0.25);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.btn-back:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.85);
  transform: translateY(-1px);
}

.btn-back:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-forward {
  color: var(--walnut-900);
  background: linear-gradient(180deg, var(--brass-400) 0%, var(--brass-600) 100%);
  box-shadow:
    0 0 0 1px var(--brass-600),
    0 4px 16px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn-forward:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.btn-forward:active,
.btn-back:active:not(:disabled) {
  transform: translateY(0);
}

/* Progress */

.progress {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  padding: 0 0 0.75rem;
  margin: 0;
}

.progress__dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: rgba(201, 164, 92, 0.25);
  transition: background 0.25s, transform 0.25s;
}

.progress__dot.is-current {
  background: var(--brass-400);
  transform: scale(1.35);
}

.progress__dot.is-done {
  background: rgba(201, 164, 92, 0.55);
}

/* Card stage */

.card-stage {
  position: relative;
  min-height: 18rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  border-radius: 0.75rem;
  background-color: var(--felt-800);
  background-image:
    radial-gradient(ellipse at center, var(--felt-700) 0%, var(--felt-800) 70%),
    repeating-linear-gradient(0deg, transparent, transparent 3px, rgba(0, 0, 0, 0.05) 3px, rgba(0, 0, 0, 0.05) 4px);
  box-shadow:
    inset 0 0 60px rgba(0, 0, 0, 0.35),
    0 8px 32px rgba(0, 0, 0, 0.4);
}

.card-stage__cards {
  position: relative;
  width: 100%;
  max-width: 22rem;
  height: 15rem;
}

.card-stage__cards--spread {
  max-width: 26rem;
  height: 16rem;
}

.card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 9.375rem;
  height: auto;
  margin-left: -4.6875rem;
  margin-top: -6.75rem;
  border-radius: 0.65rem;
  box-shadow: 0 4px 7px 1px rgba(0, 0, 0, 0.45);
  opacity: 0;
  transform: translateY(3rem) rotate(-8deg) scale(0.85);
  transition: opacity 0.5s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 1;
}

.card.is-visible {
  opacity: 1;
  transform: translateY(0) rotate(0deg) scale(1);
}

.card.is-spread-left.is-visible {
  transform: translateX(-3.5rem) rotate(-14deg) scale(0.92);
  z-index: 1;
}

.card.is-spread-right.is-visible {
  transform: translateX(3.5rem) rotate(14deg) scale(0.92);
  z-index: 1;
}

.card-stage__cards .card:nth-child(1) { z-index: 3; }
.card-stage__cards .card:nth-child(2) { z-index: 2; }
.card-stage__cards .card:nth-child(3) { z-index: 1; }

/* Footer */

.site-footer {
  flex-shrink: 0;
  padding: 0.85rem 1.5rem 1rem;
  text-align: center;
  background: rgba(22, 47, 36, 0.82);
  border-top: 1px solid rgba(201, 164, 92, 0.28);
}

.site-footer__links {
  font-size: 0.75rem;
  color: rgba(243, 234, 216, 0.78);
}

.site-footer__links a {
  margin: 0 0.65rem;
  color: rgba(212, 184, 122, 0.75);
}

.site-footer__links a:hover {
  color: var(--brass-300);
}

/* Social links */

.social-links {
  position: fixed;
  right: 1rem;
  bottom: 5rem;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.social-links a {
  display: block;
  opacity: 0.7;
  transition: opacity 0.2s, transform 0.2s;
}

.social-links a:hover {
  opacity: 1;
  transform: scale(1.08);
}

.social-links img {
  display: block;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.35rem;
}

@media (max-width: 600px) {
  .panel {
    padding: 1.5rem 1.25rem 3rem;
  }

  .panel__actions {
    left: 1rem;
    right: 1rem;
    bottom: -1rem;
    flex-direction: column-reverse;
  }

  .panel__actions .btn-forward,
  .panel__actions .btn-back {
    width: 100%;
  }

  .panel__actions .btn-forward {
    margin-left: 0;
  }

  .social-links {
    display: none;
  }

  .card-stage {
    min-height: 14rem;
  }

  .card {
    width: 7.5rem;
    margin-left: -3.75rem;
    margin-top: -5.5rem;
  }

  .card.is-spread-left.is-visible {
    transform: translateX(-2.25rem) rotate(-12deg) scale(0.9);
  }

  .card.is-spread-right.is-visible {
    transform: translateX(2.25rem) rotate(12deg) scale(0.9);
  }
}