/* ============================================
   NoTransaction Website — Shared Styles
   M3 Color Scheme · Seed #263238
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --color-bg: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-surface-alt: #EEF0F4;
  --color-surface-low: #F0F2F5;
  --color-border: rgba(0, 0, 0, 0.06);
  --color-text: #191C20;
  --color-text-secondary: #43474E;
  --color-text-muted: #8D9199;
  --color-primary: #263238;
  --color-primary-soft: rgba(38, 50, 56, 0.08);
  --color-accent: #00897B;
  --color-on-primary: #FFFFFF;
  --color-footer-bg: #F0F2F5;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 740px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 40px;
  --spacing-2xl: 64px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 100px;
}

[data-theme="dark"] {
  --color-bg: #111418;
  --color-surface: #1D2024;
  --color-surface-alt: #272A2F;
  --color-surface-low: #191C20;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-text: #E1E2E8;
  --color-text-secondary: #C3C6CF;
  --color-text-muted: #8D9199;
  --color-primary: #A0CEC5;
  --color-primary-soft: rgba(160, 206, 197, 0.10);
  --color-accent: #00D2AA;
  --color-on-primary: #053731;
  --color-footer-bg: #0C0F13;
}

/* Auto dark mode based on system preference if no data-theme is set */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #111418;
    --color-surface: #1D2024;
    --color-surface-alt: #272A2F;
    --color-surface-low: #191C20;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-text: #E1E2E8;
    --color-text-secondary: #C3C6CF;
    --color-text-muted: #8D9199;
    --color-primary: #A0CEC5;
    --color-primary-soft: rgba(160, 206, 197, 0.10);
    --color-accent: #00D2AA;
    --color-on-primary: #053731;
    --color-footer-bg: #0C0F13;
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* --- Navigation --- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  /* Use rgba for blur effect */
  background-color: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-brand span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* --- Theme Switch --- */
.theme-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 52px;
  height: 28px;
  margin-left: 8px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.theme-switch .slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  transition: background-color 0.3s, border-color 0.3s;
  border-radius: 28px;
}

.theme-switch .slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--color-text-secondary);
  transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1), background-color 0.3s;
  border-radius: 50%;
  z-index: 2;
}

.theme-switch .icon-sun,
.theme-switch .icon-moon {
  position: absolute;
  width: 14px;
  height: 14px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  transition: opacity 0.3s;
  pointer-events: none;
}

.theme-switch .icon-sun {
  right: 7px;
  color: var(--color-text-muted);
  opacity: 1;
}

.theme-switch .icon-moon {
  left: 7px;
  color: var(--color-primary);
  opacity: 0;
}

.theme-switch input:checked + .slider {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
}

.theme-switch input:focus-visible + .slider {
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-primary);
}

.theme-switch input:checked + .slider:before {
  transform: translateX(24px);
  background-color: var(--color-primary);
}

.theme-switch input:checked ~ .icon-sun {
  opacity: 0;
}

.theme-switch input:checked ~ .icon-moon {
  opacity: 1;
}

/* Subtle logo glow in dark mode */
[data-theme="dark"] .hero-logo {
  filter: drop-shadow(0 4px 12px rgba(0, 137, 123, 0.25));
}

@media (prefers-color-scheme: dark) { 
  :root:not([data-theme="light"]) .hero-logo {
    filter: drop-shadow(0 4px 12px rgba(0, 137, 123, 0.25));
  }
}

/* --- Content --- */

.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.page-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-sm);
}

.page-subtitle {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

ul, ol {
  color: var(--color-text-secondary);
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-sm);
}

strong {
  color: var(--color-text);
  font-weight: 600;
}

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

a:hover {
  text-decoration: underline;
}

/* --- Info Box --- */

.info-box {
  background: var(--color-primary-soft);
  border: 1px solid rgba(53, 102, 94, 0.15);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.info-box p {
  color: var(--color-text);
  margin-bottom: 0;
  font-size: 0.9rem;
}

/* --- Table --- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0 var(--spacing-lg);
  font-size: 0.9rem;
}

th, td {
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

th {
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

td {
  color: var(--color-text-secondary);
}

/* --- Footer --- */

.footer {
  background: var(--color-footer-bg);
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
}

.footer p {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-bottom: var(--spacing-xs);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-decoration: none;
  transition: color 0.2s;
}

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

/* --- Hamburger Button (hidden on desktop) --- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 101;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Responsive: Tablet --- */

@media (max-width: 768px) {
  .content {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .page-title {
    font-size: 1.5rem;
  }

  table {
    font-size: 0.85rem;
  }
}

/* --- Responsive: Mobile --- */

@media (max-width: 600px) {
  .content {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .page-title {
    font-size: 1.35rem;
  }

  .nav-inner {
    padding: var(--spacing-sm) var(--spacing-md);
    flex-wrap: wrap;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: var(--spacing-sm) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-sm);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s, color 0.2s;
  }

  .nav-links a:hover {
    background-color: var(--color-surface-alt);
  }

  .nav-links li:last-child {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .theme-switch {
    margin-left: 0;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .footer-links a {
    font-size: 0.9rem;
    padding: var(--spacing-xs) 0;
  }

  .store-links {
    flex-direction: column;
    align-items: center;
  }

  .store-link {
    width: 100%;
    max-width: 240px;
    justify-content: center;
  }

  table {
    font-size: 0.8rem;
  }

  th, td {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}