/* ============================================================
   DEXT Landing Page — Style
   Design: Industrial Technical (dark)
   Matches app.pen Landing Page frame (nf3al)
   ============================================================ */

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* --- Design Tokens --- */
:root {
  --bg-main: #0C0C0C;
  --bg-sidebar: #080808;
  --bg-card: #0A0A0A;
  --bg-elevated: #141414;

  --accent: #00FF88;
  --accent-dim: #00FF8810;
  --accent-border: #00FF8840;
  --accent-bg: #00FF8815;
  --accent-muted: #00FF8830;
  --accent-glow: #00FF8866;
  --accent-badge: #00FF8820;

  --text-primary: #FFFFFF;
  --text-secondary: #6a6a6a;
  --text-muted: #8A8A8A;

  --border: #2f2f2f;
  --warning: #FF8800;
  --error: #FF4444;

  --font-mono: 'JetBrains Mono', monospace;
  --font-heading: 'Space Grotesk', sans-serif;
}

body {
  font-family: var(--font-mono);
  background: var(--bg-main);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 80px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-main);
  backdrop-filter: blur(12px);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  height: 20px;
  width: auto;
}

.logo-text {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-nav-download {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: var(--bg-main);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  transition: opacity 0.2s;
}

.btn-nav-download:hover {
  opacity: 0.85;
}

.nav-version {
  font-size: 9px;
  font-weight: 500;
  color: var(--text-secondary);
}

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  transition: transform 0.3s, opacity 0.3s;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  padding: 100px 80px 80px;
}

.hero-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  padding: 6px 16px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--accent);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  flex-shrink: 0;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 72px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -2px;
  text-align: center;
  max-width: 900px;
}

.hero-sub {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.7;
  text-align: center;
  color: var(--text-secondary);
  max-width: 700px;
}

.hero-buttons {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--bg-main);
  padding: 14px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 14px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: var(--text-secondary);
  background: var(--bg-elevated);
}

.hero-platforms {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 10px;
  font-weight: 500;
  color: var(--text-secondary);
}

.platform-divider {
  color: var(--border);
  font-weight: 400;
}

/* --- App Preview Mockup --- */
.app-preview {
  width: 100%;
  max-width: 1000px;
  border: 1px solid var(--border);
  background: var(--bg-sidebar);
  overflow: hidden;
  margin-top: 16px;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  height: 36px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: var(--error); }
.dot-yellow { background: var(--warning); }
.dot-green { background: var(--accent); }

.app-body {
  display: flex;
  min-height: 380px;
}

.mock-sidebar {
  width: 180px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 16px 0;
}

.mock-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
}

.mock-mark {
  height: 14px;
  width: auto;
}

.mock-logo-text {
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.mock-nav {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.mock-nav-group-label {
  font-size: 6px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  padding: 8px 14px 3px;
}

.mock-nav-group-label:first-child {
  padding-top: 0;
}

.mock-nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 7px;
  font-weight: 500;
  color: var(--text-secondary);
}

.mock-nav-item.active {
  background: var(--accent-dim);
  border-left: 2px solid var(--accent);
  color: var(--text-primary);
  font-weight: 600;
}

.mock-nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-secondary);
  flex-shrink: 0;
}

.mock-nav-dot.active {
  background: var(--accent);
}

.mock-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 24px;
  min-width: 0;
}

.mock-label {
  font-size: 7px;
  font-weight: 500;
  color: var(--accent);
}

.mock-title {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 0;
}

.mock-sub {
  font-size: 8px;
  font-weight: 400;
  color: var(--text-secondary);
  margin: 0;
}

.mock-input,
.mock-output {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 12px;
  font-size: 8px;
  font-weight: 400;
  min-height: 48px;
  display: flex;
  align-items: flex-start;
}

.mock-input span {
  color: var(--text-secondary);
}

.mock-output span {
  color: var(--accent);
}

.mock-btns {
  display: flex;
  gap: 6px;
}

.mock-btn-primary {
  background: var(--accent);
  color: var(--bg-main);
  padding: 6px 14px;
  font-size: 7px;
  font-weight: 700;
  font-family: var(--font-mono);
}

.mock-btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 14px;
  font-size: 7px;
  font-weight: 600;
  font-family: var(--font-mono);
}

.mock-status {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--accent-border);
  padding: 8px 12px;
  font-size: 7px;
  font-weight: 400;
  color: var(--text-muted);
}

.mock-status-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
  flex-shrink: 0;
}

/* ============================================================
   FEATURES
   ============================================================ */
.features {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
  padding: 80px;
  border-top: 1px solid var(--border);
}

.section-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.section-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--accent);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  text-align: center;
  max-width: 600px;
}

.section-title-single {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -1px;
  text-align: center;
}

.section-sub {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  width: 100%;
}

.group-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.group-card-count {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  color: var(--text-muted);
}

.group-card-divider {
  width: 100%;
  height: 1px;
  background: var(--border);
}

.group-card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.group-tool {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.group-tool-name {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-primary);
}

.group-tool-desc {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--text-secondary);
}

/* --- Shared Icon Styles (used in Why section) --- */
.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.icon-text {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}

/* ============================================================
   WHY
   ============================================================ */
.why {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
  padding: 80px;
  border-top: 1px solid var(--border);
}

.why-columns {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  width: 100%;
}

.why-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.why-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-align: center;
}

.why-desc {
  font-size: 11px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-secondary);
  text-align: center;
}

/* ============================================================
   DOWNLOAD CTA
   ============================================================ */
.download-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  padding: 100px 80px;
  border-top: 1px solid var(--border);
}

.cta-title {
  font-family: var(--font-heading);
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1.5px;
  text-align: center;
}

.cta-sub {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  text-align: center;
}

/* --- Download Card --- */
.download-card {
  width: 100%;
  max-width: 560px;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.download-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.download-tab {
  flex: 1;
  padding: 14px 24px;
  background: var(--bg-card);
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

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

.download-tab.active {
  color: var(--text-primary);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

/* --- Panels --- */
.download-panel {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 32px;
}

.download-panel.active {
  display: flex;
}

.download-arch {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
}

.download-btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  background: var(--accent);
  color: var(--bg-main);
  padding: 16px 28px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  transition: opacity 0.2s;
}

.download-btn-primary:hover {
  opacity: 0.85;
}

.download-alt {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--text-secondary);
  text-align: center;
}

.download-alt a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent-muted);
  transition: text-decoration-color 0.2s;
}

.download-alt a:hover {
  text-decoration-color: var(--accent);
}

/* --- Curl Block (Linux) --- */
.download-curl {
  display: flex;
  align-items: center;
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border);
}

.download-curl code {
  flex: 1;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--accent);
  white-space: nowrap;
  overflow-x: auto;
}

.download-curl-copy {
  padding: 14px 16px;
  background: transparent;
  border: none;
  border-left: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.2s;
  flex-shrink: 0;
}

.download-curl-copy:hover {
  color: var(--text-primary);
}

/* --- Manual Links (Linux) --- */
.download-manual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.download-manual-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.download-manual-links a {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  padding: 6px 12px;
  border: 1px solid var(--accent-muted);
  transition: background 0.2s, border-color 0.2s;
}

.download-manual-links a:hover {
  background: var(--accent-dim);
  border-color: var(--accent-border);
}

.download-manual-sep {
  font-size: 11px;
  color: var(--text-muted);
}

.cta-version {
  font-size: 10px;
  font-weight: 400;
  color: var(--text-muted);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 40px 80px;
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-logo-icon {
  height: 16px;
  width: auto;
}

.footer-logo-text {
  font-size: 13px;
  font-weight: 600;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-links a {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-divider {
  width: 100%;
  height: 1px;
  background: var(--border);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  font-weight: 400;
  color: var(--text-muted);
}

/* ============================================================
   RESPONSIVE — Tablet (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .navbar {
    padding: 16px 40px;
  }

  .hero {
    padding: 80px 40px 60px;
  }

  .hero-title {
    font-size: 56px;
  }

  .features,
  .why {
    padding: 60px 40px;
  }

  .download-cta {
    padding: 80px 40px;
  }

  .cta-title {
    font-size: 40px;
  }

  .download-card {
    max-width: 100%;
  }

  .footer {
    padding: 40px;
  }

  .app-preview {
    max-width: 100%;
  }

  .why-columns {
    gap: 16px;
  }
}

/* ============================================================
   RESPONSIVE — Mobile (≤ 768px)
   ============================================================ */
@media (max-width: 768px) {
  /* Navbar */
  .navbar {
    padding: 14px 24px;
    flex-wrap: wrap;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-mobile-toggle {
    display: flex;
  }

  .navbar.open .nav-links {
    display: flex;
    flex-direction: column;
    width: 100%;
    order: 3;
    gap: 16px;
    padding: 20px 0 8px;
    border-top: 1px solid var(--border);
    margin-top: 14px;
  }

  .navbar.open .nav-links .nav-link {
    font-size: 12px;
  }

  .navbar.open .nav-cta {
    display: flex;
    width: 100%;
    order: 4;
    padding-bottom: 8px;
  }

  /* Hero */
  .hero {
    padding: 60px 24px 48px;
    gap: 24px;
  }

  .hero-badge {
    font-size: 8px;
    padding: 6px 12px;
  }

  .hero-title {
    font-size: 40px;
    letter-spacing: -1px;
  }

  .hero-sub {
    font-size: 12px;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  /* App Preview — simplified on mobile */
  .mock-sidebar {
    display: none;
  }

  .mock-content {
    padding: 16px;
  }

  .mock-title {
    font-size: 20px;
  }

  /* Sections */
  .features,
  .why {
    padding: 48px 24px;
    gap: 32px;
  }

  .section-title,
  .section-title-single {
    font-size: 30px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .why-columns {
    grid-template-columns: 1fr;
  }

  /* Download CTA */
  .download-cta {
    padding: 60px 24px;
    gap: 24px;
  }

  .cta-title {
    font-size: 32px;
  }

  .download-card {
    max-width: 100%;
  }

  .download-tab {
    font-size: 11px;
    padding: 12px 16px;
  }

  .download-panel {
    padding: 24px;
  }

  .download-curl code {
    font-size: 9px;
  }

  /* Footer */
  .footer {
    padding: 32px 24px;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* ============================================================
   RESPONSIVE — Small Mobile (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
  .hero-title {
    font-size: 32px;
  }

  .hero-badge {
    font-size: 7px;
    gap: 6px;
  }

  .hero-sub {
    font-size: 11px;
  }

  .app-preview {
    display: none;
  }

  .section-title,
  .section-title-single {
    font-size: 26px;
  }

  .cta-title {
    font-size: 28px;
  }

  .group-card,
  .why-card {
    padding: 20px;
  }
}