/* ─── Reset ─────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

/* ─── Tokens ─────────────────────────────────────────────────────────────── */
:root {
  --bg:        #0c0c0e;
  --bg2:       #111114;
  --surface:   #16161a;
  --border:    #222228;
  --border2:   #2e2e38;
  --text-1:    #f0ede6;
  --text-2:    #8a8a96;
  --text-3:    #52525e;
  --accent:    #c9933a;
  --accent-dim:#2a1e0a;
  --mono:      'IBM Plex Mono', monospace;
  --serif:     'EB Garamond', Georgia, serif;
}

/* ─── Base ───────────────────────────────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ─── Nav ────────────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 3rem;
  border-bottom: 1px solid transparent;
  transition: border-color 300ms, background 300ms;
  background: transparent;
}
.nav.scrolled {
  border-color: var(--border);
  background: rgba(12, 12, 14, 0.92);
  backdrop-filter: blur(12px);
}
.nav-wordmark {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  color: var(--accent);
}
.nav-links {
  display: flex;
  gap: 2.5rem;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-3);
  text-decoration: none;
  transition: color 200ms;
}
.nav-links a:hover { color: var(--text-1); }

/* ─── Hero ───────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 3rem 5rem;
  overflow: hidden;
}
.hero-number {
  position: absolute;
  right: -0.05em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--serif);
  font-size: clamp(18rem, 28vw, 32rem);
  font-weight: 600;
  line-height: 0.85;
  color: transparent;
  -webkit-text-stroke: 1px var(--border);
  user-select: none;
  pointer-events: none;
  letter-spacing: -0.04em;
}
.hero-content {
  position: relative;
  max-width: 780px;
  animation: fadein 800ms ease both;
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5.5vw, 4.5rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--text-1);
  margin-bottom: 2rem;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
}
.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--text-2);
  line-height: 1.7;
  max-width: 540px;
  animation: fadein 800ms 150ms ease both;
}
.hero-scroll {
  position: absolute;
  bottom: 3rem;
  left: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: fadein 1000ms 400ms ease both;
}
.scroll-line {
  width: 1px;
  height: 48px;
  background: var(--border2);
  display: block;
}
.scroll-label {
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-3);
  writing-mode: vertical-rl;
}

/* ─── Sections ───────────────────────────────────────────────────────────── */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 7rem 3rem;
  border-top: 1px solid var(--border);
}
.section-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 2.5rem;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 2.5rem;
}
.section-intro {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 580px;
  margin-bottom: 3.5rem;
  line-height: 1.75;
}

/* ─── Concepts ───────────────────────────────────────────────────────────── */
.concepts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.concept {
  background: var(--bg);
  padding: 2.5rem;
  position: relative;
  transition: background 200ms;
}
.concept:hover { background: var(--surface); }
.concept-n {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--text-3);
  margin-bottom: 1.25rem;
}
.concept h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--text-1);
}
.concept p {
  font-size: 0.95rem;
  color: var(--text-2);
  line-height: 1.7;
}

/* ─── Tool ───────────────────────────────────────────────────────────────── */
.tool-shell {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2.5rem;
}
.tool-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 1rem;
}
textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border2);
  color: var(--text-1);
  font-family: var(--serif);
  font-size: 1.0rem;
  line-height: 1.65;
  padding: 1.25rem;
  resize: vertical;
  outline: none;
  transition: border-color 200ms;
}
textarea:focus { border-color: var(--accent); }
textarea::placeholder { color: var(--text-3); }
.tool-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
}
.char-count {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--text-3);
  letter-spacing: 0.1em;
}
#submit-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: #0c0c0e;
  border: none;
  padding: 0.75rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: opacity 200ms, transform 200ms;
}
#submit-btn:hover { opacity: 0.88; }
#submit-btn:active { transform: translateY(1px); }
#submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-arrow { transition: transform 200ms; }
#submit-btn:hover .btn-arrow { transform: translateX(3px); }

/* ─── Tool Result ─────────────────────────────────────────────────────────── */
.tool-status {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-2);
  padding: 1.25rem 0 0.25rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
.result-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 1.5rem;
}
.result-card-label {
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.75rem;
}
.result-card-value {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-1);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.result-card-value.accent { color: var(--accent); }

/* loading spinner */
.spinner {
  display: inline-block;
  width: 10px; height: 10px;
  border: 1px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 600ms linear infinite;
  margin-right: 0.5em;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Tool Error ─────────────────────────────────────────────────────────── */
.tool-error {
  border-top: 1px solid #3a1a1a;
  margin-top: 2rem;
  padding-top: 1.5rem;
}
.error-header {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #c05050;
  margin-bottom: 0.75rem;
}
.error-intro {
  font-size: 0.9rem;
  color: var(--text-2);
  margin-bottom: 1rem;
}
#error-list {
  padding-left: 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-2);
  line-height: 1.8;
}

/* ─── Registry ───────────────────────────────────────────────────────────── */
.registry-soon {
  border: 1px solid var(--border);
  padding: 2.5rem;
}
.registry-soon-inner {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}
.soon-mark {
  font-size: 1.5rem;
  color: var(--text-3);
  flex-shrink: 0;
  line-height: 1;
  margin-top: 0.1rem;
}
.soon-title {
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--text-1);
  margin-bottom: 0.4rem;
}
.soon-desc {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.7;
}

/* ─── Footer ─────────────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 3rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.footer-wordmark {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: var(--accent);
}
.footer-rule {
  flex: 1;
  height: 1px;
  background: var(--border);
}
.footer-copy {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--text-3);
}

/* ─── Animations ─────────────────────────────────────────────────────────── */
@keyframes fadein {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .nav { padding: 1rem 1.5rem; }
  .nav-links { gap: 1.5rem; }
  .hero { padding: 7rem 1.5rem 4rem; }
  .hero-number { font-size: 45vw; }
  .section { padding: 4rem 1.5rem; }
  .concepts { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .tool-shell { padding: 1.5rem; }
  .footer { padding: 2rem 1.5rem; }
}