/*
 * Base styles - CSS variables, body, and navbar.
 * This file contains foundational styles and theming variables.
 */

/* =============================================================================
   CSS Custom Properties (Variables)
   ============================================================================= */

:root {
  /* Primary gradient colors */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --primary-gradient-45: linear-gradient(45deg, #667eea 0%, #764ba2 100%);
  --primary-color: #667eea;
  --secondary-color: #764ba2;

  /* Neutral colors */
  --body-bg: #f8f9fa;
  --card-bg: #ffffff;
  --surface-light: #f8f9fa;
  --surface-lighter: #f1f3f4;
  --border-color: #e9ecef;
  --border-color-dark: #dee2e6;
  --text-primary: #495057;
  --text-secondary: #6c757d;

  /* Navbar */
  --navbar-bg: #ffffff;
  --navbar-border: #e9ecef;
  --navbar-brand-color: #1e293b;
  --navbar-brand-icon: #667eea;
  --navbar-link-color: #64748b;
  --navbar-link-hover-color: #1e293b;
  --navbar-link-hover-bg: rgba(0, 0, 0, 0.04);
  --navbar-link-active-color: #667eea;
  --navbar-link-active-bg: rgba(102, 126, 234, 0.1);
  --navbar-btn-border: rgba(0, 0, 0, 0.1);
  --navbar-username-color: #94a3b8;
  --navbar-toggler-stroke: rgba(30, 41, 59, 0.7);

  /* Input colors */
  --input-bg: #ffffff;
  --input-border: #e9ecef;
  --input-text: #495057;

  /* Status colors */
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --warning-highlight: #fff3cd;

  /* Shadows */
  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);

  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.2s ease-in-out;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* =============================================================================
   Dark Mode Variables
   ============================================================================= */

[data-theme="dark"] {
  --body-bg: #111827;
  --card-bg: #1f2937;
  --surface-light: #1f2937;
  --surface-lighter: #263040;
  --border-color: #374151;
  --border-color-dark: #4b5563;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;

  --input-bg: #263040;
  --input-border: #374151;
  --input-text: #f9fafb;

  --warning-highlight: #3d2e00;

  --navbar-bg: #0f172a;
  --navbar-border: rgba(255, 255, 255, 0.06);
  --navbar-brand-color: #f8fafc;
  --navbar-brand-icon: #a78bfa;
  --navbar-link-color: #94a3b8;
  --navbar-link-hover-color: #f8fafc;
  --navbar-link-hover-bg: rgba(255, 255, 255, 0.07);
  --navbar-link-active-color: #c4b5fd;
  --navbar-link-active-bg: rgba(167, 139, 250, 0.12);
  --navbar-btn-border: rgba(255, 255, 255, 0.15);
  --navbar-username-color: #64748b;
  --navbar-toggler-stroke: rgba(148, 163, 184, 0.9);

  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
  --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.5);
}

/* =============================================================================
   Body Styles
   ============================================================================= */

body {
  background-color: var(--body-bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

/* =============================================================================
   Navbar Styles
   Fixed dark slate nav — consistent in both light and dark mode,
   no jarring contrast against either background.
   ============================================================================= */

.navbar-modern {
  background: var(--navbar-bg) !important;
  border: none !important;
  border-bottom: 1px solid var(--navbar-border);
  box-shadow: var(--shadow-sm);
  padding: 0.625rem 0;
  transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
}

.navbar-brand-modern {
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--navbar-brand-color) !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.navbar-brand-modern .bi {
  color: var(--navbar-brand-icon);
  font-size: 1.1rem;
}

.navbar-brand-modern:hover {
  opacity: 0.85;
}

.navbar-nav .nav-link {
  color: var(--navbar-link-color) !important;
  font-weight: 500;
  padding: 0.375rem 0.875rem !important;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  margin: 0 0.1rem;
  font-size: 0.875rem;
}

.navbar-nav .nav-link:hover {
  color: var(--navbar-link-hover-color) !important;
  background-color: var(--navbar-link-hover-bg);
}

.navbar-nav .nav-link.active {
  color: var(--navbar-link-active-color) !important;
  background-color: var(--navbar-link-active-bg);
  font-weight: 600;
}

/* Navbar buttons */
.btn-nav-login {
  background: var(--navbar-link-active-bg);
  border: 1px solid var(--navbar-link-active-color);
  color: var(--navbar-link-active-color);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.375rem 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-nav-login:hover {
  background: var(--navbar-link-active-color);
  color: white;
  transform: translateY(-1px);
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--navbar-btn-border);
  color: var(--navbar-link-color);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.375rem 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-logout:hover {
  background: var(--navbar-link-hover-bg);
  border-color: var(--navbar-link-hover-color);
  color: var(--navbar-link-hover-color);
  transform: translateY(-1px);
}

/* Username display */
.navbar-username {
  color: var(--navbar-username-color);
  font-size: 0.875rem;
}

/* Navbar toggler (mobile) */
.navbar-toggler {
  border: 1px solid var(--navbar-btn-border);
  padding: 0.375rem 0.5rem;
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* Toggler icon — separate rules per mode since SVG data URIs can't use CSS vars */
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2830, 41, 59, 0.7%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

[data-theme="dark"] .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28148, 163, 184, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Theme toggle button */
.btn-theme-toggle {
  background: transparent;
  border: 1px solid var(--navbar-btn-border);
  color: var(--navbar-link-color);
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.9rem;
  padding: 0;
  flex-shrink: 0;
}

.btn-theme-toggle:hover {
  background: var(--navbar-link-hover-bg);
  color: var(--navbar-brand-icon);
}

/* Main container */
.container-main {
  padding-top: 1rem;
  min-height: calc(100vh - 80px);
}

/* Nav icon */
.nav-icon {
  width: 1rem;
  height: 1rem;
  margin-right: 0.5rem;
}

/* =============================================================================
   Navbar Mobile Responsive
   ============================================================================= */

@media (max-width: 991.98px) {
  .navbar-nav {
    padding-top: 0.75rem;
    border-top: 1px solid var(--navbar-border);
    margin-top: 0.75rem;
  }

  .navbar-nav .nav-link {
    padding: 0.6rem 1rem !important;
    margin: 0.1rem 0;
  }

  .auth-buttons {
    padding-top: 0.75rem;
    border-top: 1px solid var(--navbar-border);
    margin-top: 0.75rem;
  }
}