:root {
  --bg: #0c0d0b;
  --panel: #161814;
  --panel-soft: #1d1f1b;
  --text: #f4f5f1;
  --muted: rgba(255, 255, 255, 0.68);
  --border: rgba(255, 255, 255, 0.09);
  --primary: #6cc78a;
  --primary-soft: rgba(108, 199, 138, 0.13);
  --primary-line: rgba(108, 199, 138, 0.32);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.38);
  --radius: 20px;
  --max-width: 1120px;
  --serif: "Songti SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  line-height: 1.62;
}

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

a:hover {
  text-decoration: underline;
}

body {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(12, 13, 11, 0.82);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--text);
  font-family: var(--serif);
}

.brand::before {
  content: "🚶 ";
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 72px;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: stretch;
  margin-bottom: 24px;
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-copy,
.hero-side,
.section,
.faq-item,
.footer {
  padding: 28px;
}

.eyebrow {
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  margin: 0 0 12px;
  line-height: 1.22;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(34px, 5vw, 54px);
}

h2 {
  font-size: clamp(23px, 3vw, 31px);
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 12px;
  color: var(--muted);
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.feature-list,
.simple-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.feature-list li,
.simple-list li {
  margin-bottom: 10px;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  border: 1px solid var(--primary-line);
  color: var(--text);
  font-size: 13px;
}

.download-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}

.download-cta {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 14px 22px;
  border-radius: 14px;
  background: var(--primary);
  color: #08130c;
  border: 1px solid var(--primary);
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.download-cta:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(108, 199, 138, 0.24);
}

.download-cta-label {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.01em;
}

.download-cta-sub {
  font-size: 12px;
  opacity: 0.8;
  margin-top: 2px;
}

.download-secondary {
  font-size: 13px;
  color: var(--muted);
}

.download-secondary:hover {
  color: var(--primary);
}

.columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.lang-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}

.lang-tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
}

.page-title {
  margin-bottom: 28px;
  padding: 40px 32px;
  border-top: 2px solid var(--primary);
  background: linear-gradient(180deg, var(--primary-soft) 0%, rgba(255, 255, 255, 0.01) 100%);
}

.page-title h1 {
  margin-bottom: 8px;
}

.page-title p {
  margin-bottom: 0;
}

.page-title .eyebrow {
  margin-bottom: 16px;
}

.section-stack {
  display: grid;
  gap: 20px;
}

.footer,
.site-footer {
  margin-top: 32px;
  color: var(--muted);
  text-align: center;
  padding: 28px;
}

.contact-box {
  margin-top: 18px;
  padding: 16px;
  border-radius: 16px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: rgba(255, 255, 255, 0.06);
  padding: 1px 6px;
  border-radius: 6px;
}

.feedback-form {
  display: grid;
  gap: 20px;
}

.form-group {
  display: grid;
  gap: 8px;
}

.form-label {
  color: var(--text);
  font-weight: 700;
}

.optional,
.form-hint,
.char-count {
  color: rgba(255, 255, 255, 0.54);
  font-size: 13px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #050604;
  color: var(--text);
  font: inherit;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input,
.form-select {
  min-height: 48px;
  padding: 0 14px;
}

.form-textarea {
  min-height: 180px;
  resize: vertical;
  padding: 14px;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary-line);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.char-count {
  text-align: right;
}

.char-count.warn {
  color: #fbbf24;
}

.submit-btn,
.reset-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px solid var(--primary-line);
  border-radius: 999px;
  background: var(--primary);
  color: #08130c;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.submit-btn:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

.feedback-result {
  display: none;
}

.feedback-result.visible {
  display: block;
}

.result-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary-soft);
  border: 1px solid var(--primary-line);
  color: var(--primary);
  font-size: 30px;
  font-weight: 800;
}

.result-title {
  margin-bottom: 10px;
  color: var(--text);
  font-size: 24px;
  font-weight: 800;
  text-align: center;
}

.result-desc {
  max-width: 620px;
  margin: 0 auto 24px;
  text-align: center;
}

@media (max-width: 900px) {
  .hero,
  .section-grid,
  .columns {
    grid-template-columns: 1fr;
  }

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