:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-speed: 0.2s;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
}

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

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

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

/* Respect Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus Outlines for Accessibility */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-display);
  font-weight: 700;
  line-height: 1.15;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: 1rem;
}

/* Brand Logos - Exact sizing constraints from CDN */
.logo-primary {
  width: auto;
  height: 64px;
  max-width: 220px;
  display: block;
}

.logo-primary svg,
.logo-primary img {
  width: auto;
  height: 64px;
  max-width: 220px;
  display: block;
  object-fit: contain;
}

.logo-submarker {
  height: 36px;
  width: 36px;
  display: block;
  flex-shrink: 0;
}

.logo-submarker svg,
.logo-submarker img {
  width: 36px;
  height: 36px;
  display: block;
  object-fit: contain;
}

.logo-favicon {
  height: 16px;
  width: 16px;
  display: inline-block;
  flex-shrink: 0;
}

.logo-favicon svg,
.logo-favicon img {
  width: 16px;
  height: 16px;
  display: block;
  object-fit: contain;
}

/* Hero Primary Logo from CDN */
.hero-primary-logo {
  max-width: 320px;
  width: 100%;
  height: auto;
  min-height: 60px;
  max-height: 110px;
  display: block;
  margin-bottom: 1.5rem;
}

.hero-primary-logo svg,
.hero-primary-logo img {
  width: 100%;
  height: auto;
  max-height: 110px;
  max-width: 320px;
  display: block;
  object-fit: contain;
}

/* Signup Primary Logo from CDN */
.signup-primary-logo {
  max-width: 260px;
  width: 100%;
  height: auto;
  min-height: 50px;
  max-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.75rem auto;
}

.signup-primary-logo svg,
.signup-primary-logo img {
  width: 100%;
  height: auto;
  max-height: 90px;
  max-width: 260px;
  display: block;
  object-fit: contain;
}

/* Reusable UI Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  min-height: 44px;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-speed) var(--transition-ease);
  text-decoration: none;
  font-size: 0.95rem;
  touch-action: manipulation;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #ffffff;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Header Outline Sign In Button - Seamlessly Syncs Across Light & Dark Modes */
.btn-outline-primary {
  background-color: transparent;
  border: 1.5px solid var(--primary-color);
  color: var(--primary-color);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.45rem 1.25rem;
  border-radius: var(--radius-md);
  min-height: 40px;
  transition: all var(--transition-speed) var(--transition-ease);
}

.btn-outline-primary:hover {
  background-color: var(--primary-ring);
  border-color: var(--primary-hover);
  color: var(--primary-hover);
}

[data-theme="dark"] .btn-outline-primary {
  background-color: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

[data-theme="dark"] .btn-outline-primary:hover {
  background-color: rgba(59, 130, 246, 0.15);
  border-color: var(--primary-hover);
  color: var(--primary-hover);
}

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

.btn-outline:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-hover);
}

.btn-danger {
  background-color: var(--danger-color);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: var(--danger-hover);
}

/* Inputs & Form Groups */
.form-group {
  margin-bottom: 1.25rem;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-display);
}

.form-input {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-speed) var(--transition-ease),
              box-shadow var(--transition-speed) var(--transition-ease),
              background-color var(--transition-speed) var(--transition-ease),
              color var(--transition-speed) var(--transition-ease);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-ring);
}

.form-input:disabled, .form-input[readonly] {
  background-color: var(--bg-disabled);
  color: var(--text-secondary);
  cursor: not-allowed;
}

.form-error {
  color: var(--danger-color);
  font-size: 0.85rem;
  margin-top: 0.35rem;
  display: block;
  min-height: 1.2em;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
  min-height: 44px;
  padding: 0.25rem 0;
}

.form-checkbox input[type="checkbox"] {
  margin-top: 0.2rem;
  accent-color: var(--primary-color);
  width: 1.2rem;
  height: 1.2rem;
  flex-shrink: 0;
  cursor: pointer;
}

/* SVGs and Icons */
.svg-icon {
  display: inline-block;
  vertical-align: middle;
  line-height: 0;
}

.svg-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}