/* ============================================================
   FISCH — style.css
   Premium, minimal, dark. No external dependencies.
   ============================================================ */

/* --- Custom properties --- */
:root {
  --bg:           #0c0c0c;
  --bg-section:   #101010;
  --surface:      #161616;
  --border:       #1e1e1e;
  --border-light: #2a2a2a;

  --text:         #d8e8e0;
  --text-muted:   #6b8278;
  --text-dim:     #3c5048;
  --accent:       #7a9c82;

  --font-serif: 'Palatino Linotype', Palatino, 'Book Antiqua', serif;
  --font-sans:  -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;

  --max-w:        860px;
  --max-w-narrow: 640px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;
  --space-16: 8rem;
  --space-20: 10rem;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  scroll-padding-top: 5rem;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
}

main {
  padding-top: 5rem;
}

/* --- Typography --- */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: normal;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--text);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  line-height: 1.2;
}

h3 {
  font-size: 1.125rem;
  letter-spacing: 0;
}

p {
  color: var(--text);
  max-width: 62ch;
}

a {
  color: var(--text);
  text-decoration: none;
}

/* --- Utilities --- */
.overline {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.placeholder-note {
  color: var(--text-dim);
  font-size: 0.875rem;
  font-style: italic;
  margin-top: var(--space-2);
}

/* --- Layout --- */
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-12) var(--space-4);
}

section + section {
  border-top: 1px solid var(--border);
}

/* --- Header / Nav --- */
.nav-rail { display: none; }

.site-header {
  position: fixed;
  top: 1.5rem;
  left: 0;
  right: 0;
  z-index: 100;
  pointer-events: none;
}

.nav-inner {
  max-width: fit-content;
  margin: 0 auto;
  padding: 0.6rem 0.6rem 0.6rem 1.25rem;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background-color: rgba(14, 14, 14, 0.92);
  border: 1px solid var(--border-light);
  border-radius: 100px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: all;
}

.wordmark {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text);
  display: flex;
  align-items: center;
}

.wordmark img {
  display: block;
  height: 22px;
  width: auto;
}

.wordmark-img {
  display: block;
  height: 20px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-3);
}

.nav-link {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--text-muted);
}

.nav-link.is-active {
  color: var(--text);
}

.nav-cta {
  display: inline-block;
  padding: 0.45rem 1rem;
  background-color: var(--border-light);
  border-radius: 100px;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  transition: background-color 0.2s, color 0.2s;
}

.nav-cta:hover {
  background-color: var(--surface);
  color: var(--text);
}

/* --- Buttons --- */
.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background-color: var(--text);
  color: var(--bg);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-ghost {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* --- Hero --- */
#hero {
  background-color: var(--bg);
  background-image: radial-gradient(ellipse 70% 50% at 15% 40%, rgba(122, 156, 130, 0.07) 0%, transparent 70%);
}

.hero-inner {
  padding-top: var(--space-16);
  padding-bottom: var(--space-6);
}

.hero-copy h1 {
  max-width: 18ch;
  margin-bottom: var(--space-4);
}

.hero-atmosphere {
  display: none;
}

/* Scroll cue */
.scroll-cue {
  display: block;
  margin-top: var(--space-6);
  color: var(--text-dim);
  animation: scroll-cue-pulse 2.4s ease-in-out infinite;
}

@keyframes scroll-cue-pulse {
  0%, 100% { opacity: 0.35; transform: translateY(0); }
  50%       { opacity: 0.75; transform: translateY(4px); }
}

.hero-sub {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  align-items: center;
}

/* --- Journey --- */
#journey {
  background-color: var(--bg);
  border-top: none;
}

.journey-inner {
  padding-top: var(--space-4);
  padding-bottom: var(--space-12);
}

.journey-sequence {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  position: relative;
  margin-top: var(--space-8);
  max-width: var(--max-w-narrow);
}

.journey-sequence::before {
  content: '';
  position: absolute;
  top: 0.3rem;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    var(--border-light) 12%,
    var(--border-light) 88%,
    transparent
  );
}

.journey-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  position: relative;
  z-index: 1;
  cursor: pointer;
}

.journey-step:focus-visible {
  outline: 1px solid var(--border-light);
  outline-offset: 6px;
  border-radius: 2px;
}

.journey-node {
  display: block;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  border: 1px solid var(--border-light);
  background-color: var(--bg-section);
  transition: border-color 0.2s, background-color 0.2s;
}

.journey-step-label {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
  transition: color 0.2s;
}

/* hover — subtle, does not reveal content */
.journey-step:hover .journey-node {
  border-color: var(--text-muted);
}

.journey-step:hover .journey-step-label {
  color: var(--text-muted);
}

/* active — set by JS */
.journey-step.is-active .journey-node {
  border-color: var(--accent);
  background-color: var(--accent);
}

.journey-step.is-active .journey-step-label {
  color: var(--text);
}

/* panel */
.journey-panel {
  max-width: var(--max-w-narrow);
  margin-top: var(--space-6);
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  border-left: 2px solid var(--accent);
  opacity: 0;
  transition: opacity 0.25s;
}

.journey-panel.is-visible {
  opacity: 1;
}

.journey-panel-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: none;
}

/* --- Problem --- */
#problem .section-inner {
  padding-bottom: var(--space-12);
}

#problem h2 {
  max-width: 22ch;
  margin-bottom: var(--space-4);
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 58ch;
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.problem-list {
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
  margin-bottom: var(--space-8);
}

.problem-list li {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: var(--space-4);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
}

.problem-label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

.problem-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.problem-close {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--text);
  max-width: none;
}

/* --- Fit matrix (Where FISCH fits best) --- */
.fit-matrix {
  list-style: none;
  border-top: 1px solid var(--border);
  margin-top: var(--space-6);
}

.fit-row {
  display: grid;
  grid-template-columns: 10rem 2rem 1fr;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
}

.fit-category {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
}

.fit-arrow {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  user-select: none;
}

.fit-scenario {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.fit-scenario-name {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  display: block;
}

.fit-scenario-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: block;
  max-width: none;
}

/* --- Build groups (What Gets Built) --- */
.build-grid {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  border-radius: 2px;
  margin-top: var(--space-6);
}

.build-group {
  background-color: var(--bg);
  padding: var(--space-6) var(--space-6) var(--space-6);
}

.build-group + .build-group {
  margin-top: 0;
}

.build-group-label {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.build-items {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  border-radius: 1px;
}

.build-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: var(--space-4);
  background-color: var(--bg-section);
  transition: background-color 0.2s;
}

.build-item:hover {
  background-color: var(--surface);
}

.build-item-name {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.01em;
}

.build-item-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: none;
}

/* --- Proof signals --- */
.signal-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  border-radius: 1px;
}

.signal-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: var(--space-4);
  background-color: var(--bg);
}

.signal-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: none;
}

/* --- Brand strip --- */
.brand-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  border-top: 1px solid var(--border);
  padding-top: var(--space-6);
  margin-top: var(--space-8);
}

.brand-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.brand-item img {
  display: block;
  height: 28px;
  width: auto;
  max-width: 100%;
  filter: brightness(0) invert(0.75);
  margin-bottom: var(--space-1);
}

.exp-name {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text);
  display: block;
  letter-spacing: 0.01em;
}

.exp-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.45;
  display: block;
  max-width: none;
}

/* --- Method --- */
#method {
  background-color: var(--bg-section);
}

#method h2 {
  max-width: 26ch;
  margin-bottom: var(--space-4);
}

.method-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  border-radius: 2px;
  margin-top: var(--space-6);
}

.method-step {
  display: grid;
  grid-template-columns: 8rem 1fr;
  background-color: var(--bg);
  border-left: 2px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s, border-left-color 0.2s;
}

.method-step:focus-visible {
  outline: 1px solid var(--border-light);
  outline-offset: -2px;
}

.method-step:not(.is-active):hover {
  background-color: #111111;
  border-left-color: var(--border-light);
}

/* inactive */
.method-step:not(.is-active) {
  align-items: center;
}

.method-step:not(.is-active) .step-head,
.method-step:not(.is-active) .step-body {
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.method-step:not(.is-active) .step-marker {
  color: var(--text-dim);
}

.method-step:not(.is-active) .step-body h3 {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.method-step:not(.is-active) .step-body p {
  display: none;
}

/* active */
.method-step.is-active {
  background-color: var(--surface);
  border-left-color: var(--accent);
}

.step-head {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: var(--space-1);
  padding: var(--space-6);
  border-right: 1px solid var(--border);
}

.step-number {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.step-marker {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
}

.step-body {
  padding: var(--space-6);
}

.step-body h3 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: var(--space-2);
}

.step-body p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 60ch;
}

.method-engines {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-align: center;
  margin-top: var(--space-6);
  max-width: none;
}

/* --- Content sections --- */
#what-gets-built,
#proof,
#who,
#offers,
#scenarios {
  background-color: var(--bg);
}

/* --- Contact --- */
#contact {
  background-color: var(--surface);
}

.contact-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

.contact-copy h2 {
  margin-bottom: var(--space-3);
}

.contact-copy .section-lead {
  margin-bottom: 0;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-field label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.contact-form input,
.contact-form textarea {
  background-color: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.6rem 0.75rem;
  width: 100%;
  box-sizing: border-box;
  transition: border-color 0.2s;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-dim);
}

.contact-form .btn-primary {
  align-self: flex-start;
  margin-top: var(--space-1);
}

.form-fallback {
  margin-top: var(--space-3);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.form-fallback a {
  color: var(--accent);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-4);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-tagline {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* --- Desktop nav rail (min-width: 1200px) --- */
@media (min-width: 1200px) {
  /* Hide pill nav; remove offset it created */
  .site-header { display: none; }
  main { padding-top: 0; }
  html { scroll-padding-top: 2rem; }

  /* Hero: two-column layout — atmosphere fills right column */
  .hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: center;
  }
  .hero-atmosphere {
    display: block;
    position: relative;
    overflow: hidden;
    background:
      radial-gradient(ellipse 70% 55% at 48% 42%, rgba(122, 156, 130, 0.10) 0%, transparent 58%),
      radial-gradient(ellipse 45% 35% at 52% 58%, rgba(38, 65, 50, 0.12) 0%, transparent 50%),
      radial-gradient(ellipse 90% 75% at 50% 50%, rgba(10, 20, 15, 0.18) 0%, transparent 70%);
    pointer-events: none;
    min-height: 280px;
  }

  /* Rail container — pill/card, centered in left gutter */
  .nav-rail {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    position: fixed;
    top: 50%;
    transform: translateY(-50%) translateX(2.5rem);
    left: max(1.5rem, calc((100vw - var(--max-w)) / 4));
    z-index: 100;
    background-color: rgba(10, 10, 10, 0.92);
    border: 1px solid rgba(52, 68, 60, 0.55);
    border-radius: 20px;
    padding: 1.75rem 1.5rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 32px rgba(0, 0, 0, 0.45), 0 0 0 0.5px rgba(122, 156, 130, 0.07);
  }

  .rail-wordmark img {
    display: block;
    height: 20px;
    width: auto;
    opacity: 0.4;
    transition: opacity 0.2s;
  }
  .rail-wordmark:hover img { opacity: 0.85; }

  /* Links list — relative so blob SVG can position within it */
  .rail-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
  }

  .rail-item {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    padding: 0.75rem 0;
  }

  /* Dot marker — z-index above blob */
  .rail-dot {
    display: block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--border-light);
    flex-shrink: 0;
    transition: background-color 0.25s;
    position: relative;
    z-index: 2;
  }

  .rail-link {
    font-size: 1.0625rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-dim);
    transition: color 0.25s;
    white-space: nowrap;
    line-height: 1;
  }
  .rail-link:hover { color: var(--text-muted); }

  .rail-item.is-active .rail-dot { background-color: var(--accent); }
  .rail-item.is-active .rail-link { color: var(--text); }

  /* Blob SVG — absolutely inside .rail-links */
  .rail-blob-svg {
    position: absolute;
    left: 0;
    top: 0;
    width: 13px;
    overflow: visible;
    pointer-events: none;
  }

  .rail-blob-path {
    fill: var(--accent);
    opacity: 0.38;
    transition: d 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
}

/* Reduced motion overrides */
@media (prefers-reduced-motion: reduce) {
  .rail-blob-path { transition: none; }
  .scroll-cue { animation: none; opacity: 0.4; }
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .site-header {
    top: 0.75rem;
    left: 0.75rem;
    right: 0.75rem;
  }

  .nav-inner {
    max-width: 100%;
    flex-wrap: wrap;
    border-radius: 12px;
    padding: 0.6rem 0.75rem 0.6rem 1rem;
    gap: 0.4rem var(--space-2);
  }

  .wordmark {
    flex: 1;
  }

  .nav-links {
    display: flex;
    order: 3;
    width: 100%;
    flex-wrap: wrap;
    gap: 0.25rem var(--space-2);
    padding-top: 0.35rem;
    border-top: 1px solid var(--border);
  }

  .problem-list li {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }


  .hero-inner {
    padding-top: var(--space-8);
    padding-bottom: var(--space-4);
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .method-step {
    grid-template-columns: 1fr;
  }

  .step-head {
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
    padding-bottom: var(--space-4);
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .step-body {
    padding-top: var(--space-4);
  }

  .build-items {
    grid-template-columns: 1fr;
  }

  .signal-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .brand-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .fit-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
    padding: var(--space-3) 0;
  }

  .fit-arrow {
    display: none;
  }

  .contact-split {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-1);
    align-items: flex-start;
  }
}