/* ===== LANDING PAGE STYLESHEET ===== */
/* Scoped styles for index.html landing page only, loaded conditionally via {% block head %} */

/* ===== LOCAL TOKENS ===== */
/* Derived from the main design system but isolated to this page */
:root {
  --landing-glow: rgba(165, 63, 65, 0.14);
  --landing-glow-light: rgba(197, 90, 93, 0.1);
  --landing-card-radius: 14px;
  --landing-step-size: 44px;
  --landing-connector-width: 2px;
}

/* ===== HERO SECTION ===== */
.hero-panel {
  position: relative;
  isolation: isolate;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3rem, 7vw, 5rem);
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 8% 20%, var(--landing-glow) 0%, transparent 28%),
    radial-gradient(circle at 92% 85%, var(--landing-glow-light) 0%, transparent 35%);
  z-index: 0;
}

.hero-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.02) 0px, rgba(255, 255, 255, 0.02) 1px, transparent 1px, transparent 2px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.02) 0px, rgba(255, 255, 255, 0.02) 1px, transparent 1px, transparent 2px);
  mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 0.6) 50%, rgba(0, 0, 0, 0) 100%);
  pointer-events: none;
  z-index: 1;
}

.hero-panel::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
  z-index: 2;
}

.hero-inner {
  position: relative;
  z-index: 3;
}

.hero-panel h1 {
  background: linear-gradient(135deg, var(--cream-white) 0%, rgba(197, 90, 93, 0.8) 85%);
  -webkit-background-clip: text;
  background-clip: text;
  color: var(--cream-white); /* fallback for older browsers */
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.035em;
  font-size: clamp(2.75rem, 7vw, 4.75rem);
  line-height: 1.04;
  margin-bottom: 1.25rem;
}

.hero-panel .hero-subheading {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 1.35rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
}

.hero-panel .lede {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  max-width: 62ch;
  color: rgba(247, 241, 230, 0.86);
  line-height: 1.7;
}

/* ===== METHOD TIMELINE SECTION ===== */
.method-overview {
  position: relative;
  z-index: 1;
  margin-top: clamp(4rem, 9vw, 6.5rem);
  padding: clamp(2.5rem, 5vw, 3.5rem) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.method-overview .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(165, 63, 65, 0.1);
  border: 1px solid rgba(165, 63, 65, 0.3);
  padding: 0.4rem 0.875rem;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.method-overview .eyebrow::before {
  content: '•';
  display: inline-block;
  font-size: 8px;
  line-height: 1;
}

.method-paragraphs {
  display: grid;
  gap: 0;
  margin-top: 2.5rem;
  max-width: 78ch;
  position: relative;
}

.method-paragraphs::before {
  content: '';
  position: absolute;
  left: calc(var(--landing-step-size) / 2 - var(--landing-connector-width) / 2);
  top: 0;
  bottom: 0;
  width: var(--landing-connector-width);
  background: linear-gradient(180deg, var(--accent) 0%, transparent 100%);
  z-index: 0;
}

.method-paragraph {
  position: relative;
  z-index: 1;
  padding-left: 4.5rem;
  padding-top: 0.5rem;
  padding-bottom: 1.5rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.75;
}

.method-paragraph::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: 0;
  width: var(--landing-step-size);
  height: var(--landing-step-size);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.5rem;
  font-weight: 500;
  color: rgba(165, 63, 65, 0.4);
  background: var(--paper);
  border: 2px solid var(--line);
  border-radius: 50%;
  z-index: 2;
}

.method-paragraph strong {
  display: block;
  color: var(--cream-white);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.method-paragraph + .method-paragraph {
  margin-top: 2rem;
}

/* ===== CHOICE CARDS ===== */
.choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: clamp(1rem, 2.5vw, 1.75rem);
  margin-top: clamp(3rem, 7vw, 4.5rem);
}

.choice {
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--line);
  padding: 2.25rem;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--landing-card-radius);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.choice::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(165, 63, 65, 0.2) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

.choice::after {
  content: attr(data-icon);
  position: absolute;
  bottom: 1rem;
  right: 1.5rem;
  font-size: 3.5rem;
  color: rgba(165, 63, 65, 0.12);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  z-index: 0;
}

.choice:hover {
  border-color: var(--accent);
  background: #202020;
  transform: translateY(-8px);
  box-shadow: 0 10px 30px var(--shadow);
}

.choice:hover::before {
  opacity: 1;
}

.choice:hover::after {
  color: rgba(165, 63, 65, 0.25);
  transform: scale(1.1);
}

.choice:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.choice h2 {
  position: relative;
  z-index: 2;
  margin-bottom: 1rem;
  border: 0;
  padding: 0;
  font-size: 1.3rem;
  color: var(--cream-white);
  padding-bottom: 0.75rem;
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease;
}

.choice h2::after {
  display: none;
}

.choice:hover h2 {
  border-bottom-color: var(--accent);
}

.choice p {
  position: relative;
  z-index: 2;
  margin-bottom: 2rem;
  font-size: 0.95rem;
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  flex: 1;
  line-height: 1.65;
}

.action {
  position: relative;
  z-index: 2;
  font-weight: 700;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.action::after {
  content: '→';
  display: inline-block;
  transition: transform 0.2s ease;
}

.choice:hover .action::after {
  transform: translateX(4px);
}

/* Appendix section */
#jupyter {
  margin-top: clamp(4rem, 9vw, 6rem);
}

#jupyter > h2 {
  margin-bottom: 2rem;
}

/* ===== MOTION & ANIMATION ===== */
@keyframes reveal-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Reveal animations controlled by landing.js */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
}

html.js-reveal [data-reveal].is-revealed {
  animation: reveal-rise 0.6s ease-out forwards;
}

[data-reveal-delay="1"].is-revealed {
  animation-delay: 60ms;
}

[data-reveal-delay="2"].is-revealed {
  animation-delay: 120ms;
}

[data-reveal-delay="3"].is-revealed {
  animation-delay: 180ms;
}

[data-reveal-delay="4"].is-revealed {
  animation-delay: 240ms;
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  .hero-glow,
  .hero-panel::before,
  .hero-panel::after,
  .method-paragraphs::before,
  .choice,
  .choice::before,
  .choice::after,
  .action::after,
  [data-reveal],
  [data-reveal].is-revealed {
    animation: none !important;
    transition: none !important;
  }

  html.js-reveal [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 900px) {
  .method-paragraph {
    padding-left: 3.5rem;
  }

  .method-paragraph::before {
    width: 38px;
    height: 38px;
    font-size: 1.25rem;
  }

  .method-paragraphs::before {
    left: calc(19px - 1px);
  }

}

@media (max-width: 700px) {
  .method-paragraph {
    padding-left: 3.25rem;
  }

  .method-paragraph::before {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .method-paragraphs::before {
    left: calc(16px - 1px);
  }

}

@media (max-width: 520px) {
  .hero-panel h1 {
    font-size: clamp(2.2rem, 5.5vw, 2.8rem);
  }

  .choice {
    padding: 1.5rem;
  }

  .choice::after {
    font-size: 2.5rem;
    bottom: 0.75rem;
    right: 1rem;
  }

  .method-overview {
    padding: 1.5rem 0;
  }

  .method-paragraph {
    padding-left: 2.75rem;
  }

  .method-paragraph::before {
    width: 28px;
    height: 28px;
    font-size: 0.85rem;
  }

  .method-paragraphs::before {
    left: calc(14px - 1px);
  }
}