:root {
  --ink: #15202b;
  --ink-soft: #4a5d6e;
  --paper: #f3f6f8;
  --paper-cool: #e4ecf2;
  --mist: #c9d8e4;
  --ice: #2f7f8f;
  --ice-deep: #246573;
  --amber: #b8863d;
  --amber-soft: #d9b56e;
  --line: rgba(26, 35, 50, 0.12);
  --radius: 14px;
  --font-display: "Noto Serif SC", "Fraunces", serif;
  --font-body: "Noto Sans SC", system-ui, sans-serif;
  --space: clamp(1rem, 2.5vw, 2rem);
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(47, 127, 143, 0.18), transparent 55%),
    radial-gradient(900px 600px at 92% 6%, rgba(184, 134, 61, 0.14), transparent 52%),
    linear-gradient(180deg, var(--paper-cool) 0%, var(--paper) 48%, #eef3f6 100%);
  line-height: 1.65;
  min-height: 100vh;
}

img,
canvas {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 2.5rem);
  backdrop-filter: blur(10px);
  background: rgba(243, 246, 248, 0.78);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.95rem;
}

.nav a {
  text-decoration: none;
  color: var(--ink-soft);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--ink);
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink) !important;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: var(--ink);
  color: var(--paper) !important;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-wash {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, transparent 32%, rgba(243, 246, 248, 0.5) 66%, rgba(243, 246, 248, 0.94) 100%),
    radial-gradient(ellipse 70% 45% at 72% 28%, rgba(217, 181, 110, 0.22), transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: clamp(5rem, 14vh, 8rem) 0 clamp(3.5rem, 10vh, 5.5rem);
}

.brand-mark {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.8rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1;
  color: var(--ink);
}

.hero-title {
  margin: 0 0 1rem;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 34ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.btn:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--ice-deep);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(26, 35, 50, 0.35);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
  background: rgba(255, 255, 255, 0.35);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms ease, transform 700ms ease;
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

[data-reveal]:nth-child(2) { transition-delay: 80ms; }
[data-reveal]:nth-child(3) { transition-delay: 160ms; }
[data-reveal]:nth-child(4) { transition-delay: 240ms; }

.feel,
.craft,
.ask {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: clamp(3.5rem, 9vh, 6rem) 0;
}

.feel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

@media (min-width: 900px) {
  .feel {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

.feel-copy h2,
.craft-title,
.ask-panel h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  line-height: 1.3;
  font-weight: 600;
}

.feel-copy p,
.ask-lead {
  margin: 0;
  color: var(--ink-soft);
  max-width: 38ch;
}

.dialogue {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  background: rgba(255, 255, 255, 0.45);
}

.bubble {
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  max-width: 100%;
}

.bubble-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.bubble p {
  margin: 0;
  min-height: 1.5em;
}

.bubble-user {
  background: rgba(58, 122, 140, 0.12);
  justify-self: start;
  width: min(100%, 34rem);
}

.bubble-ai {
  background: rgba(196, 137, 58, 0.14);
  justify-self: end;
  width: min(100%, 34rem);
  position: relative;
}

.cursor {
  display: inline-block;
  width: 0.55ch;
  height: 1.05em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--amber);
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.craft-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.75rem;
}

@media (min-width: 800px) {
  .craft-grid {
    grid-template-columns: 1.35fr 1fr;
    grid-template-rows: auto auto;
  }

  .craft-feature--lead {
    grid-row: span 2;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2rem;
    background:
      linear-gradient(160deg, rgba(58, 122, 140, 0.18), rgba(255, 255, 255, 0.2) 55%, rgba(196, 137, 58, 0.16));
  }

  .craft-feature--wide {
    grid-column: 2;
  }
}

.craft-feature {
  padding: 1.35rem 1.4rem;
  border-top: 1px solid var(--line);
}

.craft-feature h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
}

.craft-feature p {
  margin: 0;
  color: var(--ink-soft);
}

.ask-panel {
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-radius: calc(var(--radius) + 8px);
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.7), rgba(232, 238, 244, 0.55));
  box-shadow: 0 24px 60px rgba(26, 35, 50, 0.06);
}

.ask-form {
  margin-top: 1.4rem;
  display: grid;
  gap: 0.9rem;
}

.ask-form textarea {
  width: 100%;
  resize: vertical;
  min-height: 6.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(26, 35, 50, 0.18);
  background: rgba(255, 255, 255, 0.85);
  font: inherit;
  color: var(--ink);
  line-height: 1.6;
}

.ask-form textarea:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 2px;
  border-color: transparent;
}

.ask-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
}

.ask-hint {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.ask-reply {
  margin-top: 1.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.ask-reply-label {
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  font-weight: 600;
}

#ask-reply-text {
  margin: 0;
  font-size: 1.05rem;
  max-width: 48ch;
}

.site-footer {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0 0 0.4rem;
}

.site-footer strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
}

.footer-note {
  max-width: 42ch;
}

@media (max-width: 640px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .hero-content {
    padding-top: 6.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .cursor {
    transition: none;
    animation: none;
  }
}