/* ── Landing page — all styles scoped under .landing-page ─────────────────── */

/* smooth scroll — harmless on other pages (no anchor links) */
html {
  scroll-behavior: smooth;
}

/* Anchor targets: offset for sticky nav height */
#features,
#how {
  scroll-margin-top: 60px;
}

.landing-page *,
.landing-page *::before,
.landing-page *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Nav ── */
.landing-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--chrome-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}

.landing-nav .nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 60px;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.landing-nav .nav-logo {
  flex: 1;
  display: flex;
  align-items: center;
}

.landing-nav .nav-logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
  border: none;
}

.landing-nav .nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ── Buttons ── */
.landing-page .btn-ghost {
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  font-weight: var(--fw-medium);
  color: var(--fg-2);
  background: none;
  border: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.landing-page .btn-ghost:hover {
  background: var(--slate-100);
  color: var(--fg-1);
}

.landing-page .btn-primary {
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  font-weight: var(--fw-medium);
  color: #fff;
  background: var(--slate-700);
  border: none;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.landing-page .btn-primary:hover { background: var(--slate-800); }
.landing-page .btn-primary:active { background: var(--slate-900); transform: translateY(0.5px); }

.landing-page .btn-primary-lg {
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  font-weight: var(--fw-medium);
  color: #fff;
  background: var(--slate-700);
  border: none;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.landing-page .btn-primary-lg:hover { background: var(--slate-800); }
.landing-page .btn-primary-lg:active { background: var(--slate-900); transform: translateY(0.5px); }

/* ── Sections ── */
.landing-section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 96px var(--space-6);
}

/* ── Hero ── */
.landing-section.hero {
  padding-top: 88px;
  padding-bottom: 80px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-6);
}

.hero-label {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--slate-500);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.landing-section.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--slate-800);
  max-width: 680px;
}

.landing-section.hero h1 em {
  font-style: italic;
  color: var(--slate-500);
}

.hero-sub {
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  color: var(--fg-2);
  line-height: var(--lh-normal);
  max-width: 480px;
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-note {
  font-size: var(--fs-13);
  color: var(--fg-3);
}

/* ── App mockup ── */
.mockup-wrap {
  width: 100%;
  margin-top: var(--space-12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--slate-100);
  box-shadow: var(--shadow-3);
  background: var(--paper);
}

.mockup-bar {
  background: var(--slate-50);
  border-bottom: 1px solid var(--border-soft);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.mockup-dots {
  display: flex;
  gap: 6px;
}
.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--slate-200);
}

.mockup-title-bar {
  flex: 1;
  text-align: center;
  font-size: var(--fs-13);
  color: var(--fg-3);
  font-family: var(--font-sans);
}

.mockup-body {
  display: grid;
  grid-template-columns: 56px 1fr 360px;
  height: 460px;
  overflow: hidden;
}

/* sidebar */
.mock-sidebar {
  background: var(--slate-50);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
  gap: 12px;
}
.mock-sidebar-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-3);
}
.mock-sidebar-icon.active {
  background: var(--slate-100);
  color: var(--slate-600);
}

/* pdf pane */
.mock-pdf {
  background: var(--paper);
  padding: 28px 40px;
  overflow: hidden;
  position: relative;
}

.mock-pdf-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 12px;
}
.mock-pdf-title {
  font-family: var(--font-sans);
  font-size: var(--fs-13);
  color: var(--fg-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mock-pdf-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--fg-3);
}

.mock-pdf-page {
  background: #fff;
  border: 1px solid var(--slate-100);
  border-radius: 4px;
  padding: 28px 32px;
  box-shadow: var(--shadow-1);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mock-line {
  height: 10px;
  border-radius: 3px;
  background: var(--slate-100);
}
.mock-line.dark { background: var(--slate-200); }
.mock-line.short { width: 55%; }
.mock-line.medium { width: 75%; }
.mock-line.highlight {
  background: var(--highlight-yellow);
  width: 82%;
}
.mock-line.title {
  height: 16px;
  width: 60%;
  background: var(--slate-300);
  margin-bottom: 4px;
}

/* chat pane */
.mock-chat {
  background: #fff;
  border-left: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
}

.mock-chat-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-sans);
  font-size: var(--fs-13);
  font-weight: var(--fw-medium);
  color: var(--fg-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mock-chat-tabs {
  display: flex;
  gap: 0;
}
.mock-chat-tab {
  font-size: var(--fs-12);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  color: var(--fg-3);
}
.mock-chat-tab.active {
  background: var(--slate-50);
  color: var(--fg-1);
  font-weight: var(--fw-medium);
}

.mock-chat-body {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.mock-msg {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mock-msg-bubble {
  padding: 10px 13px;
  border-radius: var(--radius-md);
  font-size: var(--fs-13);
  line-height: 1.5;
  max-width: 88%;
}

.mock-msg.user .mock-msg-bubble {
  background: var(--slate-700);
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: 3px;
}

.mock-msg.assistant .mock-msg-bubble {
  background: var(--slate-50);
  color: var(--fg-1);
  align-self: flex-start;
  border-bottom-left-radius: 3px;
}

.mock-msg-cite {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-3);
  align-self: flex-start;
  padding-left: 2px;
}

.mock-chat-composer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-soft);
}
.mock-composer-input {
  background: var(--slate-50);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  padding: 9px 14px;
  font-size: var(--fs-13);
  color: var(--fg-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mock-send {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background: var(--slate-700);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
}

/* ── Divider ── */
.landing-divider {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.landing-divider hr {
  border: none;
  border-top: 1px solid var(--border-soft);
}

/* ── Section labels / headings ── */
.section-label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--slate-500);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.section-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--slate-800);
  margin-bottom: var(--space-3);
  max-width: 560px;
  text-wrap: pretty;
}

.section-sub {
  font-size: var(--fs-16);
  color: var(--fg-2);
  max-width: 480px;
  line-height: var(--lh-prose);
  text-wrap: pretty;
  margin-bottom: var(--space-12);
}

/* ── Features ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.feature-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
.feature-card:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-1px);
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--slate-50);
  border: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-500);
  flex-shrink: 0;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: var(--fs-18);
  font-weight: 600;
  color: var(--slate-800);
  line-height: 1.3;
}

.feature-desc {
  font-size: var(--fs-14);
  color: var(--fg-2);
  line-height: var(--lh-prose);
  text-wrap: pretty;
}

/* ── How it works ── */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.how-step {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.how-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--slate-400);
  letter-spacing: 0.06em;
}

.how-title {
  font-family: var(--font-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--slate-800);
  line-height: 1.3;
}

.how-desc {
  font-size: var(--fs-14);
  color: var(--fg-2);
  line-height: var(--lh-prose);
  text-wrap: pretty;
}

/* ── Highlight strip ── */
.highlight-strip {
  background: var(--slate-50);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}
.highlight-strip-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 64px var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.highlight-text { display: flex; flex-direction: column; gap: var(--space-5); }

.highlight-quote {
  font-family: var(--font-serif);
  font-size: var(--fs-20);
  font-style: italic;
  color: var(--slate-700);
  line-height: 1.55;
  border-left: 3px solid var(--slate-300);
  padding-left: var(--space-5);
  text-wrap: pretty;
}

.highlight-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.pill {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--slate-600);
  background: #fff;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
}

/* chat demo */
.chat-demo {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  background: #fff;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-1);
}

.chat-demo-msgs {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-demo .mock-msg-bubble {
  font-size: var(--fs-14);
}

/* ── CTA section ── */
.cta-section {
  text-align: center;
  padding-top: 100px;
  padding-bottom: 100px;
}

.cta-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--slate-800);
  margin-bottom: var(--space-4);
  text-wrap: pretty;
}

.cta-section p {
  font-size: var(--fs-16);
  color: var(--fg-2);
  margin-bottom: var(--space-8);
  line-height: var(--lh-normal);
}

/* ── Footer ── */
.landing-footer {
  border-top: 1px solid var(--border-soft);
  background: var(--slate-50);
}
.landing-footer .footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.landing-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-copy {
  font-size: var(--fs-13);
  color: var(--fg-3);
}
.footer-links {
  display: flex;
  gap: var(--space-5);
}
.footer-links a {
  font-size: var(--fs-13);
  color: var(--fg-3);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.footer-links a:hover {
  color: var(--fg-2);
  border-bottom-color: var(--slate-300);
}

/* ── Responsive ── */
@media (max-width: 860px) {
  .mockup-body { grid-template-columns: 56px 1fr; }
  .mock-chat { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .how-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .highlight-strip-inner { grid-template-columns: 1fr; gap: var(--space-8); }
}

@media (max-width: 560px) {
  .mockup-body { grid-template-columns: 1fr; height: 320px; }
  .mock-sidebar { display: none; }
  .landing-section { padding-top: 64px; padding-bottom: 64px; }
}