/* ==========================================================================
   Kynvora Minimal Design System — Shared Stylesheet (style.css)
   Specification: design.md
   Clean, high-clarity retail system with restrained color,
   generous whitespace, and premium product focus.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Kynvora Minimal Tokens */
  --color-primary: #0071E3;
  --color-secondary: #2997FF;
  --color-tertiary: #0066CC;
  --color-neutral: #1D1D1F;
  --color-surface: #FFFFFF;
  --color-background: #FFFFFF;
  --color-on-surface: #1D1D1F;
  --color-muted: #6E6E73;
  --color-border: #E5E7EB;
  --color-accent-quiet: #F5F5F7;
  --color-error: #D92D20;
  --color-success: #1B5E20;

  /* Legacy Theme Token Mappings for Tool Compatibility */
  --color-paper: #FFFFFF;
  --color-paper-hex: #FFFFFF;
  --color-paper-2: #FFFFFF;
  --color-paper-2-hex: #FFFFFF;
  --color-paper-3: #F5F5F7;
  --color-paper-3-hex: #F5F5F7;
  --color-paper-subtle: #F5F5F7;

  --color-ink: #1D1D1F;
  --color-ink-hex: #1D1D1F;
  --color-ink-2: #1D1D1F;
  --color-ink-2-hex: #1D1D1F;
  --color-subtle: #86868B;

  --color-rule: #E5E7EB;
  --color-rule-hex: #E5E7EB;
  --color-rule-subtle: #F0F0F2;
  --color-rule-focus: #0071E3;

  --color-accent: #0071E3;
  --color-accent-hex: #0071E3;
  --color-accent-ink: #FFFFFF;
  --color-accent-hover: #2997FF;
  --color-focus: #0071E3;

  /* Typography */
  --font-display: BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, Monaco, monospace;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 54px;
  --space-xl: 70px;

  /* Radii */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 980px;

  --duration-fast: 150ms;
  --duration-base: 200ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);

  --container: 1080px;
  --gutter: clamp(1rem, 3vw, 24px);
}

/* --------------------------------------------------------------------------
   Reset & Baseline
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  font-family: var(--font-body);
  background-color: var(--color-background);
  color: var(--color-on-surface);
  scroll-behavior: smooth;
  scroll-padding-top: 60px;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  background-color: var(--color-background);
  color: var(--color-on-surface);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}
a:hover {
  color: var(--color-secondary);
}

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

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   NAVBAR (Kynvora Frosted Glass Sticky Header)
   -------------------------------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 9999;
  width: 100%;
  height: 48px;
  margin: 0;
  padding: 0;
  background: rgba(255, 255, 255, 0.82) !important;
  backdrop-filter: saturate(180%) blur(20px) !important;
  -webkit-backdrop-filter: saturate(180%) blur(20px) !important;
  border: none !important;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
  box-shadow: none !important;
  display: flex;
  align-items: center;
}

.navbar-container {
  max-width: 1024px !important;
  width: 100% !important;
  margin: 0 auto !important;
  padding: 0 var(--space-md) !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-neutral);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.02em;
  text-decoration: none;
  cursor: pointer;
}

.logo img,
.logo-img {
  width: 20px !important;
  height: 20px !important;
  max-width: 20px !important;
  object-fit: contain !important;
  padding: 0 !important;
  background: transparent !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-family: var(--font-body);
  color: var(--color-neutral) !important;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: -0.01em;
  opacity: 0.8;
  padding: 4px 0;
  background: transparent !important;
  border: none !important;
  transition: opacity 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  opacity: 1;
  color: var(--color-primary) !important;
  background: transparent !important;
}

.nav-links a.active {
  opacity: 1;
  color: var(--color-primary) !important;
  font-weight: 600;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-md);
  transition: background-color 0.15s ease;
}
.menu-toggle:hover {
  background-color: var(--color-accent-quiet);
}
.menu-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background-color: var(--color-neutral);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: flex !important;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 48px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.96) !important;
    backdrop-filter: saturate(180%) blur(20px) !important;
    -webkit-backdrop-filter: saturate(180%) blur(20px) !important;
    border-bottom: 1px solid var(--color-border) !important;
    flex-direction: column;
    padding: 16px var(--space-md);
    gap: 16px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
    align-items: flex-start;
  }
  .nav-links a {
    font-size: 15px;
    width: 100%;
    padding: 6px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  }
  .navbar.nav-open .nav-links {
    display: flex !important;
  }
  .navbar.nav-open .menu-toggle span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
  }
  .navbar.nav-open .menu-toggle span:nth-child(2) {
    opacity: 0;
  }
  .navbar.nav-open .menu-toggle span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
  }
}

/* --------------------------------------------------------------------------
   Container & Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* --------------------------------------------------------------------------
   Hero Sections
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 36px;
  align-items: center;
}

.hero-content h1,
h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-neutral);
  margin: 0 0 12px 0;
}

.hero-subtitle,
.subtitle {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-primary);
  margin: 0 0 16px 0;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0 0 20px 0;
  max-width: 60ch;
}

.hero-image img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

/* --------------------------------------------------------------------------
   Cards & Tool Grids
   -------------------------------------------------------------------------- */
.tools,
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.card,
.tool-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--duration-base) var(--ease-standard),
              transform var(--duration-base) var(--ease-standard);
}

.card:hover,
.tool-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.card h3,
.tool-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-neutral);
  margin: 0;
}

.card p,
.tool-card p {
  font-size: 0.92rem;
  color: var(--color-muted);
  line-height: 1.5;
  margin: 0;
}

/* --------------------------------------------------------------------------
   Buttons & Actions (Full Pills)
   -------------------------------------------------------------------------- */
.btn-primary,
.cta-button,
.submit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: #FFFFFF !important;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  padding: 11px 24px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard);
}

.btn-primary:hover,
.cta-button:hover,
.submit-btn:hover {
  background-color: var(--color-secondary);
  color: #FFFFFF !important;
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-primary) !important;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  padding: 11px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  cursor: pointer;
  text-decoration: none;
  transition: border-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-secondary) !important;
}

/* --------------------------------------------------------------------------
   Panels, Info Blocks & Content
   -------------------------------------------------------------------------- */
.about-panel,
.about-cta,
.guide-hero,
.guide-panel,
.guide-cta,
.info-section {
  margin: 32px 0;
  padding: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.about-panel h2,
.about-cta h2,
.guide-panel h2,
.guide-cta h2,
.section h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--color-neutral);
  margin: 0 0 16px 0;
  letter-spacing: -0.015em;
}

.about-panel p,
.about-cta p,
.guide-panel p,
.guide-cta p {
  color: var(--color-neutral);
  font-size: 0.98rem;
  line-height: 1.7;
  margin: 0 0 16px 0;
}

.about-panel a,
.about-cta a,
.guide-panel a,
.guide-cta a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-panel a:hover,
.about-cta a:hover {
  color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   Forms & Controls
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-neutral);
  margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 11px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-neutral);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--duration-fast) var(--ease-standard);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.error-message {
  color: var(--color-error);
  font-size: 0.82rem;
  margin-top: 4px;
  display: none;
}
.error-message.show {
  display: block;
}

.success-message {
  color: var(--color-success);
  font-size: 0.9rem;
  margin-top: 12px;
  display: none;
}
.success-message.show {
  display: block;
}

/* Image Resizer / Upload Components */
.upload-section {
  margin: 32px 0;
}

.drop-zone {
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 48px 24px;
  text-align: center;
  background-color: var(--color-accent-quiet);
  cursor: pointer;
  transition: border-color var(--duration-fast) ease, background-color var(--duration-fast) ease;
}
.drop-zone:hover {
  border-color: var(--color-primary);
  background-color: rgba(0, 113, 227, 0.04);
}

.action-buttons {
  margin-top: 24px;
  text-align: center;
}

.result-section {
  margin: 32px 0;
  padding: 28px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.comparison-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.stats-row {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.stat-item {
  text-align: center;
}

.stat-label {
  color: var(--color-muted);
  font-size: 13px;
  display: block;
}

.stat-value {
  color: var(--color-primary);
  font-size: 18px;
  font-weight: 600;
  display: block;
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   FOOTER (Kynvora Minimal Colophon)
   -------------------------------------------------------------------------- */
.footer {
  margin-top: auto;
  background-color: var(--color-accent-quiet);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0 32px;
}

.footer-content {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-section h3,
.footer-section h4 {
  font-family: var(--font-display);
  color: var(--color-neutral);
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 12px 0;
}

.footer-section p {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  color: var(--color-muted);
  font-size: 13px;
  transition: color var(--duration-fast) var(--ease-standard);
}

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

.footer-bottom {
  max-width: var(--container);
  margin: 24px auto 0;
  padding: 24px var(--gutter) 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--color-muted);
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 768px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 24px;
  }
  .comparison-container {
    grid-template-columns: 1fr;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}