@import url("../assets/fonts/student-login-fonts.css");

/* CSS Variables definition for TiengTrung Link */
:root {
  /* Colors - Minimalist, Light Mode, Google/Antigravity style */
  --color-bg-primary: #FFFFFF; 
  --color-bg-secondary: #F8F9FA; 
  --color-bg-elevated: #FFFFFF; 
  
  --color-text-primary: #202124; 
  --color-text-secondary: #5F6368; 
  --color-text-muted: #80868B;

  --color-brand-primary: #1A73E8; /* Google Blue */
  --color-brand-primary-hover: #174EA6;
  --color-brand-accent: #202124; /* Button black */
  --color-brand-accent-hover: #3C4043;
  --color-on-brand-accent: #FFFFFF;
  
  --color-border: #DADCE0;
  --color-nav-bg: rgba(255, 255, 255, 0.95); /* Minimalist white glass */
  --color-hero-overlay-start: rgba(250, 249, 246, 0.95);
  --color-hero-overlay-end: rgba(250, 249, 246, 0.6);
  
  /* Typography */
  --font-family-base: 'Nunito', -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: 'Montserrat', 'Nunito', -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;
  --space-4xl: 8rem;
  
  /* Layout */
  --container-width-md: 768px;
  --container-width-lg: 1024px;
  --container-width-xl: 1200px;
  --header-height: 64px;

  /* Shadows for depth */
  --shadow-sm: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
  --shadow-md: 0 1px 2px 0 rgba(60,64,67,0.3), 0 2px 6px 2px rgba(60,64,67,0.15);
  --shadow-lg: 0 1px 3px 0 rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
  
  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Dark mode overrides (System Preference) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg-primary: #202124;
    --color-bg-secondary: #303134;
    --color-bg-elevated: #3C4043;
    
    --color-text-primary: #E8EAED;
    --color-text-secondary: #9AA0A6;
    --color-text-muted: #80868B;
    
    --color-brand-primary: #8AB4F8; 
    --color-brand-accent: #FFFFFF;
    --color-brand-accent-hover: #F8F9FA;
    --color-on-brand-accent: #202124;
    --color-border: #5F6368;
    --color-nav-bg: rgba(32, 33, 36, 0.95);
    --color-hero-overlay-start: rgba(32, 33, 36, 0.95);
    --color-hero-overlay-end: rgba(32, 33, 36, 0.6);
  }
}

/* Dark mode overrides (Manual Toggle) */
:root[data-theme="dark"] {
  --color-bg-primary: #202124;
  --color-bg-secondary: #303134;
  --color-bg-elevated: #3C4043;
  
  --color-text-primary: #E8EAED;
  --color-text-secondary: #9AA0A6;
  --color-text-muted: #80868B;
  
  --color-brand-primary: #8AB4F8; 
  --color-brand-accent: #FFFFFF;
  --color-brand-accent-hover: #F8F9FA;
  --color-on-brand-accent: #202124;
  --color-border: #5F6368;
  --color-nav-bg: rgba(32, 33, 36, 0.95);
  --color-hero-overlay-start: rgba(32, 33, 36, 0.95);
  --color-hero-overlay-end: rgba(32, 33, 36, 0.6);
}