frontend/src/index.css

/* ============================================================
   GLOBAL TOKENS — Light theme (existing pages)
   ============================================================ */
:root {
  /* Brand */
  --primary-color:  #6366f1;
  --primary-hover:  #4f46e5;
  --secondary-color:#475569;

  /* Surfaces */
  --background-color: #f8fafc;
  --surface-color:    #ffffff;
  --surface-2-color:  #f1f5f9;

  /* Text */
  --text-primary:   #1e293b;
  --text-secondary: #64748b;
  --text-muted:     #94a3b8;

  /* Borders */
  --border-color:   #e2e8f0;

  /* Feedback */
  --success-color:  #10b981;
  --error-color:    #ef4444;
  --warning-color:  #f59e0b;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Radii */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  22px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
}

/* ============================================================
   DARK THEME TOKENS — applied via [data-theme="dark"]
   Used by: Signup, Login, and all auth/landing pages
   ============================================================ */
[data-theme="dark"] {
  color-scheme: dark;

  /* Backgrounds */
  --background-color: #080808;
  --surface-color:    #111111;
  --surface-2-color:  #181818;

  /* Text */
  --text-primary:   #f0f0f0;
  --text-secondary: #888888;
  --text-muted:     #555555;

  /* Borders */
  --border-color:        rgba(255, 255, 255, 0.07);
  --border-color-glow:   rgba(99, 102, 241, 0.4);

  /* Brand accents */
  --accent-1: #6366f1;   /* indigo  */
  --accent-2: #a855f7;   /* violet  */
  --accent-3: #06b6d4;   /* cyan    */
  --accent-success: #10b981;
  --accent-error:   #f87171;

  /* Glow helpers */
  --glow-sm: 0 0 12px rgba(99, 102, 241, 0.45);
  --glow-md: 0 0 30px rgba(99, 102, 241, 0.35);
  --glow-lg: 0 0 60px rgba(99, 102, 241, 0.25);

  /* Map existing token names to dark values (used by Auth.css, etc.) */
  --primary-color:  #6366f1;
  --primary-hover:  #4f46e5;
  --background-color: #080808;
  --surface-color:    #111111;
  --surface-2-color:  #181818;
  --text-primary:   #f0f0f0;
  --text-secondary: #888888;
  --text-muted:     #555555;
  --border-color:   rgba(255, 255, 255, 0.07);
  --success-color:  #10b981;
  --error-color:    #f87171;

  /* Shadows (deeper on dark) */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
}

/* ============================================================
   BASE RESET & GLOBAL STYLES
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

@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;
    scroll-behavior: auto !important;
  }
}

/* Screen-reader-only utility */
.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;
}

/* Global focus-visible ring */
:focus-visible {
  outline: 2px solid var(--accent-1, #6366f1);
  outline-offset: 2px;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
}

body {
  font-family: var(--font-sans);
  background-color: var(--background-color);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
}

input, textarea, select {
  font-family: inherit;
}

/* ============================================================
   SHARED UTILITY CLASSES (used across multiple pages)
   ============================================================ */

/* Primary button — dark-theme aware */
.btn-primary-dark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-1, #6366f1), var(--accent-2, #a855f7));
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  position: relative;
  overflow: hidden;
}
.btn-primary-dark:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-sm, 0 0 12px rgba(99,102,241,0.45));
}
.btn-primary-dark:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Shared dark-page full-screen wrapper */
.dark-page {
  min-height: 100vh;
  background-color: var(--background-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* Shared gradient orbs (reused in home + auth pages) */
.page-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}