/* ==========================================================================
   BLUVY OFFICIAL WEBSITE - CSS STYLESHEET
   100% Conforming to colors.md, claude.md & gemini.md
   Fully Responsive (Mobile-First, Tablet, Desktop, Ultra-wide)
   ========================================================================== */

/* --- 1. DESIGN TOKENS --- */
:root {
  /* Official Brand Colors (colors.md Section 1) */
  --bluvy-blue: #185DFF;
  --bluvy-deep: #0040D6;
  --bluvy-cyan: #3BD3E7;
  --bluvy-sky: #C5F4FA;
  --bluvy-ice: #F0FDFE;

  /* Official Neutrals (colors.md Section 2) */
  --bluvy-ink: #0B1736;
  --bluvy-slate: #52627D;
  --bluvy-muted: #8290A8;
  --bluvy-border: #DCE5F2;
  --bluvy-white: #FFFFFF;

  /* Semantic Colors (colors.md Section 5) */
  --bluvy-success: #16A66A;
  --bluvy-success-bg: #E8F8F1;
  --bluvy-warning: #E59A16;
  --bluvy-warning-bg: #FFF6DF;
  --bluvy-error: #E5484D;
  --bluvy-info: #185DFF;
  --bluvy-info-bg: #EAF0FF;

  /* Official Gradients (colors.md Section 6) */
  --bluvy-gradient: linear-gradient(135deg, #185DFF 0%, #3BD3E7 100%);
  --bluvy-gradient-sky: linear-gradient(180deg, #FFFFFF 0%, #C5F4FA 100%);
  --bluvy-gradient-deep: linear-gradient(135deg, #0040D6 0%, #185DFF 100%);

  /* UI Theming - Light Mode (colors.md Section 3) */
  --bg-primary: var(--bluvy-ice);
  --bg-surface: var(--bluvy-white);
  --bg-surface-subtle: #F6FBFC;
  --bg-section-alt: #FFFFFF;
  --bg-header: rgba(240, 253, 254, 0.92);
  --text-primary: var(--bluvy-ink);
  --text-secondary: var(--bluvy-slate);
  --text-muted: var(--bluvy-muted);
  --border-color: var(--bluvy-border);
  --border-card: var(--bluvy-border);

  /* Elevation Shadows */
  --shadow-sm: 0 2px 8px rgba(11, 23, 54, 0.04);
  --shadow-md: 0 8px 24px rgba(11, 23, 54, 0.06);
  --shadow-lg: 0 16px 36px rgba(11, 23, 54, 0.09);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* Typography & Layout */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --container-max: 1160px;
  --transition-normal: 0.2s ease-in-out;
}

/* --- 2. DARK MODE (colors.md Section 4) --- */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #070D1C;         /* --bluvy-dark-background */
    --bg-surface: #0D1629;         /* --bluvy-dark-surface */
    --bg-surface-subtle: #14213A;  /* --bluvy-dark-elevated */
    --bg-section-alt: #091122;
    --bg-header: rgba(7, 13, 28, 0.92);
    --border-color: #253653;       /* --bluvy-dark-border */
    --border-card: #1F2D48;
    --text-primary: #F4F8FF;       /* --bluvy-dark-text */
    --text-secondary: #AAB8D0;     /* --bluvy-dark-secondary */
    --text-muted: #7A8CA8;

    --bluvy-blue: #4A7CFF;         /* --bluvy-dark-primary */
    --bluvy-cyan: #45D9EB;         /* --bluvy-dark-cyan */
    --bluvy-deep: #185DFF;

    --bluvy-success-bg: rgba(22, 166, 106, 0.15);
    --bluvy-warning-bg: rgba(229, 154, 22, 0.15);
    --bluvy-info-bg: rgba(74, 124, 255, 0.15);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.55);
  }
}

/* --- 3. RESET & BASE --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: var(--bluvy-blue);
  text-decoration: none;
  transition: color var(--transition-normal);
}

a:hover {
  color: var(--bluvy-deep);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Focus visibility for accessibility */
:focus-visible {
  outline: 2px solid var(--bluvy-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Screen reader only utility (accessible skip links) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only:focus {
  position: fixed;
  top: 16px;
  left: 16px;
  width: auto;
  height: auto;
  padding: 12px 20px;
  background-color: var(--bg-surface);
  color: var(--bluvy-blue);
  border: 2px solid var(--bluvy-blue);
  border-radius: var(--radius-sm);
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  clip: auto;
  white-space: normal;
}

/* --- 4. LAYOUT & CONTAINERS --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}

.section {
  padding: 60px 0;
  position: relative;
  width: 100%;
}

@media (min-width: 768px) {
  .section {
    padding: 90px 0;
  }
}

@media (min-width: 1024px) {
  .section {
    padding: 110px 0;
  }
}

.section-alt {
  background-color: var(--bg-section-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 40px auto;
}

@media (min-width: 768px) {
  .section-header {
    margin-bottom: 56px;
  }
}

.section-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background-color: var(--bluvy-info-bg);
  color: var(--bluvy-blue);
  margin-bottom: 14px;
  border: 1px solid var(--border-color);
}

.section-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

@media (min-width: 640px) {
  .section-title {
    font-size: 2.25rem;
  }
}

@media (min-width: 900px) {
  .section-title {
    font-size: 2.65rem;
  }
}

.section-description {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

@media (min-width: 768px) {
  .section-description {
    font-size: 1.15rem;
  }
}

/* --- 5. BADGES & BUTTONS --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
}

.badge-beta {
  background-color: var(--bluvy-info-bg);
  color: var(--bluvy-blue);
  border: 1px solid rgba(24, 93, 255, 0.25);
}

.badge-indev {
  background-color: var(--bluvy-warning-bg);
  color: var(--bluvy-warning);
  border: 1px solid rgba(229, 154, 22, 0.25);
}

.badge-coming {
  background-color: var(--bg-surface-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--bluvy-blue);
  color: var(--bluvy-white);
  box-shadow: 0 4px 14px rgba(24, 93, 255, 0.25);
}

.btn-primary:hover {
  background-color: var(--bluvy-deep);
  color: var(--bluvy-white);
  box-shadow: 0 6px 20px rgba(24, 93, 255, 0.38);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-subtle);
  border-color: var(--bluvy-blue);
  color: var(--bluvy-blue);
  transform: translateY(-1px);
}

.btn-sm {
  min-height: 38px;
  padding: 7px 14px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-disabled,
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
  background-color: var(--bg-surface-subtle);
  border-color: var(--border-color);
  color: var(--text-muted);
  box-shadow: none;
  transform: none !important;
}

/* --- 6. HEADER --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-header);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
  padding: 12px 0;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-logo:hover {
  color: var(--bluvy-blue);
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 28px;
}

@media (min-width: 860px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-normal);
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--bluvy-blue);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Lang switcher button */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  transition: all var(--transition-normal);
}

.lang-toggle:hover {
  border-color: var(--bluvy-blue);
  color: var(--bluvy-blue);
}

.lang-icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  flex-shrink: 0;
}

.header-cta-desktop {
  display: none;
}

@media (min-width: 600px) {
  .header-cta-desktop {
    display: inline-flex;
  }
}

/* Mobile Menu Button */
.mobile-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  flex-shrink: 0;
  transition: all var(--transition-normal);
}

.mobile-menu-toggle:hover {
  border-color: var(--bluvy-blue);
  color: var(--bluvy-blue);
}

@media (min-width: 860px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.hamburger-icon {
  width: 26px;
  height: 26px;
}

/* Mobile Nav Drawer (Full Screen Modal, Direct Body Child) */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background-color: var(--bg-surface);
  z-index: 99999;
  padding: 16px 20px 32px 20px;
  flex-direction: column;
  overflow-y: auto;
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.mobile-menu-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface-subtle);
  color: var(--text-primary);
  transition: all var(--transition-normal);
}

.mobile-menu-close:hover {
  border-color: var(--bluvy-blue);
  color: var(--bluvy-blue);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-nav-link {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  padding: 16px 16px;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid transparent;
}

.mobile-nav-link:hover, .mobile-nav-link:active {
  background-color: var(--bg-surface-subtle);
  border-color: var(--border-color);
  color: var(--bluvy-blue);
}

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.mobile-nav-actions .lang-toggle {
  min-height: 48px;
  font-size: 1rem;
  padding: 12px 20px;
  justify-content: center;
}

.mobile-nav-actions .btn {
  min-height: 52px;
  font-size: 1.05rem;
}

/* --- 7. MAIN HERO SECTION --- */
.hero-section {
  padding: 48px 0 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 72px 0 88px 0;
  }
}

@media (min-width: 1024px) {
  .hero-section {
    min-height: calc(85vh - 65px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 0 80px 0;
  }
}

.hero-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: min(90vw, 680px);
  height: 360px;
  background: radial-gradient(circle, rgba(59, 211, 231, 0.22) 0%, rgba(24, 93, 255, 0.08) 50%, rgba(240, 253, 254, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

@media (prefers-color-scheme: dark) {
  .hero-glow {
    background: radial-gradient(circle, rgba(69, 217, 235, 0.16) 0%, rgba(74, 124, 255, 0.08) 50%, rgba(7, 13, 28, 0) 70%);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

@media (min-width: 600px) {
  .hero-title {
    font-size: 2.75rem;
  }
}

@media (min-width: 960px) {
  .hero-title {
    font-size: 3.4rem;
  }
}

.hero-title-gradient {
  background: var(--bluvy-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-description {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 30px auto;
}

@media (min-width: 768px) {
  .hero-description {
    font-size: 1.25rem;
    margin-bottom: 38px;
  }
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  justify-content: center;
  align-items: stretch;
  margin-bottom: 40px;
}

@media (min-width: 520px) {
  .hero-cta-group {
    flex-direction: row;
    align-items: center;
    gap: 14px;
    margin-bottom: 48px;
  }
}

.hero-preview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 10px;
}

@media (min-width: 640px) {
  .hero-preview-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

.hero-mini-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  box-shadow: var(--shadow-sm);
  text-align: left;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-mini-card:hover {
  transform: translateY(-3px);
  border-color: var(--bluvy-blue);
}

.hero-mini-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.hero-mini-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.hero-mini-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* --- 8. APPLICATION FULLWIDTH HERO SECTIONS --- */
.app-hero-section {
  width: 100%;
  padding: 60px 0;
  position: relative;
}

@media (min-width: 900px) {
  .app-hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: 90px 0;
  }
}

.app-hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

@media (min-width: 900px) {
  .app-hero-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 56px;
  }
}

.app-hero-layout-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.app-hero-meta {
  margin-bottom: 16px;
}

.app-hero-title {
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

@media (min-width: 640px) {
  .app-hero-title {
    font-size: 2.75rem;
  }
}

@media (min-width: 900px) {
  .app-hero-title {
    font-size: 3.2rem;
  }
}

.app-hero-tagline {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--bluvy-blue);
  margin-bottom: 24px;
}

@media (min-width: 768px) {
  .app-hero-tagline {
    font-size: 1.35rem;
  }
}

/* Feature list */
.app-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
}

.app-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
}

.app-feature-check {
  width: 19px;
  height: 19px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--bluvy-blue);
}

/* In-development variant — muted check color */
.app-feature-check-indev {
  color: var(--bluvy-warning);
}

.app-hero-description {
  font-size: 0.975rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 28px auto;
  text-align: center;
}

@media (min-width: 768px) {
  .app-hero-description {
    font-size: 1.05rem;
  }
}

/* Platform chips row */
.app-platform-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 28px;
}

.app-chip {
  font-size: 0.775rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.app-chip-highlight {
  background-color: var(--bluvy-info-bg);
  border-color: rgba(24, 93, 255, 0.25);
  color: var(--bluvy-blue);
  font-weight: 700;
}

.app-hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 480px) {
  .app-hero-actions {
    flex-direction: row;
    align-items: center;
  }
}

.app-hero-layout-centered .app-feature-list {
  text-align: left;
  max-width: 580px;
  width: 100%;
  margin: 0 auto 36px auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
}

@media (min-width: 640px) {
  .app-hero-layout-centered .app-feature-list {
    padding: 28px 28px;
  }
}

/* In-development feature list — slightly muted */
.app-hero-layout-centered .app-feature-list-indev {
  border-color: rgba(229, 154, 22, 0.2);
}

.app-hero-layout-centered .app-hero-actions {
  justify-content: center;
}

/* Centered coming soon box styling */
.coming-soon-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 20px;
  max-width: 100%;
}

@media (min-width: 640px) {
  .coming-soon-box {
    padding: 18px 32px;
  }
}

/* --- 9. PHILOSOPHY SECTION --- */
.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 600px) {
  .philosophy-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (min-width: 960px) {
  .philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.philosophy-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 768px) {
  .philosophy-card {
    padding: 28px 24px;
  }
}

.philosophy-card:hover {
  transform: translateY(-3px);
  border-color: var(--bluvy-blue);
  box-shadow: var(--shadow-md);
}

.philosophy-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background-color: var(--bluvy-info-bg);
  color: var(--bluvy-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2px;
  flex-shrink: 0;
}

.philosophy-icon-wrap svg {
  width: 22px;
  height: 22px;
}

.philosophy-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.philosophy-desc {
  font-size: 0.925rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* --- 10. AT PROTOCOL SECTION --- */
.at-protocol-section {
  background-color: var(--bg-surface-subtle);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.at-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 768px) {
  .at-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

.at-card-full {
  grid-column: 1 / -1;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  box-shadow: var(--shadow-sm);
}

@media (min-width: 768px) {
  .at-card-full {
    padding: 40px 32px;
  }
}

.at-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
}

@media (min-width: 768px) {
  .at-card {
    padding: 26px 22px;
  }
}

.at-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.at-card-desc {
  font-size: 0.925rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* --- 11. FOOTER --- */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 28px 0;
  margin-top: auto;
}

@media (min-width: 768px) {
  .site-footer {
    padding: 60px 0 36px 0;
  }
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

@media (min-width: 640px) {
  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 44px;
  }
}

.footer-brand-desc {
  margin-top: 12px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 340px;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-normal);
  padding: 2px 0;
}

.footer-links a:hover {
  color: var(--bluvy-blue);
}

.footer-links .footer-link-disabled {
  font-size: 0.9rem;
  color: var(--text-muted);
  opacity: 0.6;
  cursor: default;
  padding: 2px 0;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  text-align: center;
  font-size: 0.825rem;
  color: var(--text-muted);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* --- 12. ACCESSIBILITY & PREFERS-REDUCED-MOTION --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}