:root {
  --primary: #3a6d51;
  --primary-light: #5e8c73;
  --accent: #162c1e;
  --bg: #f9fbf9;
  --surface: #ffffff;
  --surface-variant: #f4f6f4;
  --text: #162c1e;
  --text-muted: #4a6355;
  --border: #e2e8e4;
  --radius: 16px;
  --max-width: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1f15;
    --surface: #1a3824;
    --surface-variant: #1f4429;
    --text: #f2f0f7;
    --text-muted: #a9c2b3;
    --border: #2a4a35;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Noto Sans KR", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: var(--primary);
}

@media (prefers-color-scheme: dark) {
  a {
    color: var(--primary-light);
  }
}

img {
  max-width: 100%;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
.site-header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
}

.site-nav a:hover {
  color: var(--primary);
}

/* hero */
.hero {
  text-align: center;
  padding: 64px 0 48px;
}

.hero .icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 8px 24px rgba(22, 44, 30, 0.18);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 34px;
  margin: 0 0 12px;
}

.hero p.tagline {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 28px;
}

.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-secondary {
  background: var(--surface-variant);
  color: var(--text);
  border: 1px solid var(--border);
}

/* sections */
section {
  padding: 40px 0;
}

section h2 {
  font-size: 24px;
  margin-bottom: 24px;
  text-align: center;
}

.page-title {
  font-size: 30px;
  text-align: center;
  margin: 0 0 32px;
}

.perspective-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

/* flow diagram */
.flow-diagram-wrap {
  max-width: 980px;
  margin: 0 auto;
}

.flow-diagram {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.flow-diagram rect {
  fill: var(--surface);
  stroke: var(--border);
  stroke-width: 1.5;
}

.flow-diagram rect.hub {
  fill: var(--primary);
  stroke: var(--primary);
}

.flow-diagram text {
  fill: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: middle;
}

.flow-diagram text.hub-text {
  fill: #fff;
}

.flow-diagram text.sub {
  fill: var(--text-muted);
  font-size: 11px;
  font-weight: 400;
}

.flow-diagram path.link {
  fill: none;
  stroke: var(--text-muted);
  stroke-width: 1.5;
  marker-end: url(#flow-arrow);
}

.flow-diagram marker path {
  fill: var(--text-muted);
}

.perspective-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.perspective-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.perspective-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
}

.perspective-card .badge {
  display: inline-block;
  margin-top: 10px;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-variant);
  color: var(--text-muted);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.feature-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.feature-list strong {
  display: block;
  margin-bottom: 4px;
}

.feature-list span {
  color: var(--text-muted);
  font-size: 14px;
}

/* FAQ (details/summary) */
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 20px;
  margin-bottom: 12px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 16px 0;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--text-muted);
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  margin: 0 0 16px;
  color: var(--text-muted);
}

/* contact card */
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}

.contact-card-form {
  text-align: left;
}

.support-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 8px;
}

.support-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
}

.support-form select,
.support-form input,
.support-form textarea {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-variant);
  color: var(--text);
  font-weight: 400;
}

.support-form textarea {
  resize: vertical;
}

.support-form button {
  align-self: flex-start;
  font: inherit;
  padding: 12px 22px;
  border-radius: 999px;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-weight: 700;
}

.support-form button:hover {
  filter: brightness(1.08);
}

.support-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

#form-status {
  font-size: 13px;
  min-height: 1.2em;
  margin: 0;
}

#form-status[data-state="ok"] {
  color: var(--primary);
}

#form-status[data-state="error"] {
  color: #c0453a;
}

.form-note {
  font-size: 13px;
  color: var(--text-muted);
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.contact-card .email {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: inline-block;
  margin-top: 8px;
}

/* legal doc */
.legal h1 {
  font-size: 28px;
  margin-bottom: 4px;
}

.legal .meta {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 32px;
}

.legal h2 {
  font-size: 19px;
  text-align: left;
  margin: 32px 0 12px;
}

.legal h3 {
  font-size: 16px;
  margin: 20px 0 8px;
}

.legal p,
.legal li {
  font-size: 15px;
  color: var(--text);
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.legal th,
.legal td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}

.legal th {
  background: var(--surface-variant);
}

/* footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  margin-top: 40px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--text-muted);
  margin: 0 8px;
}

/* try (web chat demo) */
.try-intro {
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 0 28px;
}

.try-form {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.try-form textarea {
  flex: 1;
  min-width: 240px;
  font: inherit;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-variant);
  color: var(--text);
  resize: vertical;
}

.try-form button {
  font: inherit;
  padding: 12px 24px;
  border-radius: 999px;
  border: none;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.try-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.try-status {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-muted);
  min-height: 1.4em;
}

.try-status[data-state="error"] {
  color: #c0453a;
}

.try-perspectives {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.try-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.try-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.try-dir {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--surface-variant);
  color: var(--text-muted);
}

.try-dir-go { color: #fff; background: var(--primary); }
.try-dir-stop { color: #fff; background: #c0453a; }
.try-dir-wait { color: var(--text-muted); background: var(--surface-variant); }
.try-dir-prep { color: var(--text); background: var(--surface-variant); }
.try-dir-shift { color: #fff; background: var(--primary-light); }

.try-reading {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 8px;
}

.try-core {
  font-size: 14px;
  margin: 0;
}

.try-synthesis {
  margin-top: 24px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.try-synthesis h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.try-synthesis p {
  margin: 0;
  white-space: pre-wrap;
  font-size: 15px;
}

.try-cta {
  margin-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}