:root {
  --bg: #f6f8f7;
  --surface: #ffffff;
  --surface-soft: #edf4f1;
  --line: #d9e2df;
  --text: #17242f;
  --muted: #657385;
  --accent: #1f7a66;
  --accent-strong: #135c4d;
  --gold: #b7791f;
  --blue: #286eaa;
  --shadow: 0 22px 60px rgba(23, 36, 47, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Malgun Gothic", system-ui, sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 68px;
  border-bottom: 1px solid rgba(217, 226, 223, 0.8);
  background: rgba(246, 248, 247, 0.92);
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 clamp(18px, 4vw, 54px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 13px;
}

.site-header nav,
footer nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.hero {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
  align-items: center;
  gap: clamp(24px, 5vw, 72px);
  padding: clamp(36px, 7vw, 88px) clamp(18px, 4vw, 54px);
}

.hero-copy {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-weight: 800;
  font-size: 13px;
}

h1,
h2,
h3,
p {
  word-break: keep-all;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy > p:not(.eyebrow),
.section-heading + p,
.intro p,
.download p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.hero-actions,
.download-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  font-weight: 700;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.product-shot {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.window-bar {
  height: 42px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
}

.window-bar span {
  width: 11px;
  height: 11px;
  border-radius: 99px;
  background: #d95c5c;
}

.window-bar span:nth-child(2) {
  background: #d6a445;
}

.window-bar span:nth-child(3) {
  background: #35a873;
}

.app-preview {
  min-height: 420px;
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  background: #f7faf9;
}

.app-preview aside {
  background: #202832;
  color: #fff;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 18px;
}

.app-preview aside button {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  min-height: 42px;
  text-align: left;
  padding: 0 10px;
}

.app-preview section {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.preview-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 16px;
}

.preview-card span {
  color: var(--muted);
  font-size: 13px;
}

.preview-card strong,
.preview-card p {
  display: block;
  margin: 10px 0 0;
}

.section {
  padding: clamp(42px, 7vw, 86px) clamp(18px, 4vw, 54px);
}

.intro {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 0.8fr);
  gap: 28px;
  align-items: center;
}

.intro h2,
.section-heading h2,
.download h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
}

.intro dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.intro dl div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  padding: 16px;
}

.intro dt {
  font-size: 24px;
  font-weight: 800;
}

.intro dd {
  margin: 5px 0 0;
  color: var(--muted);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 24px;
}

.feature-grid,
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article,
.pricing-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 20px;
}

.feature-grid p,
.pricing-grid p,
.pricing-grid li,
.steps span {
  color: var(--muted);
  line-height: 1.65;
}

.steps {
  background: var(--surface);
}

.steps ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.steps li {
  border-top: 4px solid var(--accent);
  background: var(--bg);
  border-radius: 8px;
  padding: 20px;
}

.steps strong {
  display: block;
  margin-bottom: 8px;
}

.pricing-card,
.pricing-grid article {
  min-height: 280px;
}

.pricing-grid strong {
  display: block;
  font-size: 26px;
  margin: 16px 0 8px;
}

.pricing-grid .highlight {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 2px rgba(31, 122, 102, 0.14);
}

.practice-section {
  border-top: 1px solid var(--line);
  background: var(--surface);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 0.9fr);
  gap: 28px;
  align-items: center;
}

.practice-copy h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
}

.practice-copy p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.practice-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbfa;
  padding: 20px;
  display: grid;
  gap: 16px;
}

.practice-panel strong {
  display: block;
  margin-bottom: 8px;
}

.practice-panel code {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 12px;
  color: var(--accent-strong);
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
}

.practice-panel ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.75;
}

.download {
  border-top: 1px solid var(--line);
  background: #202832;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.download p {
  color: rgba(255, 255, 255, 0.72);
}

footer {
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 clamp(18px, 4vw, 54px);
  color: var(--muted);
}

.document {
  max-width: 860px;
  margin: 0 auto;
  padding: 54px 18px 90px;
}

.document h1 {
  font-size: 42px;
}

.document h2 {
  margin-top: 36px;
}

.document p {
  color: var(--muted);
  line-height: 1.75;
}

.faq-page {
  max-width: 920px;
}

.faq-group {
  margin-top: 34px;
}

.faq-group h2 {
  margin-bottom: 14px;
}

.faq-group details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-group summary {
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 800;
  list-style: none;
}

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

.faq-group summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-size: 20px;
  line-height: 1;
}

.faq-group details[open] summary {
  border-bottom: 1px solid var(--line);
}

.faq-group details[open] summary::after {
  content: "-";
}

.faq-group details p {
  margin: 0;
  padding: 16px 20px 20px;
}

.faq-group a {
  color: var(--accent-strong);
  font-weight: 700;
}

.guide-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 32px;
  padding-left: 24px;
  color: var(--muted);
  line-height: 1.7;
}

.guide-list strong {
  color: var(--text);
}

.document-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.simple-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
}

.simple-page main {
  width: min(560px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 32px;
  box-shadow: 0 18px 45px rgba(22, 29, 44, 0.08);
}

.simple-page .brand {
  display: inline-flex;
  margin-bottom: 28px;
}

.simple-page h1 {
  margin-bottom: 12px;
}

.simple-page p {
  margin-bottom: 24px;
  color: var(--muted);
  line-height: 1.7;
}

.simple-page .login-note {
  margin: 16px 0 0;
  font-size: 14px;
}

.login-complete .brand-mark {
  background: #1f7a66;
}

.login-complete main {
  border-color: rgba(31, 122, 102, 0.3);
  box-shadow: 0 22px 60px rgba(31, 122, 102, 0.16);
}

.simple-page .success-callout {
  margin: 8px 0 18px;
  padding: 18px;
  border-radius: 8px;
  background: #e8f7f1;
  color: #125642;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.45;
}

.simple-page .success-callout strong {
  color: #0d4535;
}

@media (max-width: 980px) {
  .hero,
  .intro,
  .practice-section,
  .download {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .pricing-grid,
  .steps ol {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-header nav {
    display: none;
  }
}

@media (max-width: 640px) {
  .app-preview {
    grid-template-columns: 1fr;
  }

  .preview-grid,
  .feature-grid,
  .pricing-grid,
  .steps ol,
  .intro dl {
    grid-template-columns: 1fr;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 22px;
    padding-bottom: 22px;
  }
}