/* ==========================================================================
   CampusSync Admin Login Stylesheet
   Version: 1.0.0
   Description: Modern, responsive, ERP-styled login interface.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. COLOR PALETTE & DESIGN TOKENS (LIGHT & DARK THEMES)
   -------------------------------------------------------------------------- */
:root {
  /* Brand Color Tokens */
  --primary-color: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: rgba(37, 99, 235, 0.08);
  --primary-ring: rgba(37, 99, 235, 0.25);
  
  --secondary-color: #0F172A;
  --accent-color: #06B6D4;
  --accent-light: rgba(6, 182, 212, 0.1);
  --success-color: #10B981;

  /* Light Theme Surface Tokens */
  --bg-color: #F8FAFC;
  --card-bg: #FFFFFF;
  --left-bg: #F1F5F9;
  --border-color: #E2E8F0;
  
  /* Text Colors */
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --input-bg: #FFFFFF;
  --input-border: #CBD5E1;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(37, 99, 235, 0.12), 0 6px 12px -4px rgba(15, 23, 42, 0.05);
  --shadow-card: 0 20px 40px -15px rgba(15, 23, 42, 0.1);

  /* Transitions */
  --transition-fast: all 0.2s ease-in-out;
  --transition-normal: all 0.3s ease-in-out;
}

/* Dark Theme Overrides */
[data-bs-theme="dark"] {
  --bg-color: #0B0F19;
  --card-bg: #1E293B;
  --left-bg: #0F172A;
  --border-color: #334155;

  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --input-bg: #0F172A;
  --input-border: #334155;

  --primary-light: rgba(37, 99, 235, 0.18);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------------------------
   2. GLOBAL & BASE STYLES
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  margin: 0;
  padding: 0;
  transition: var(--transition-normal);
  overflow-x: hidden;
}

/* Page Wrapper */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Navigation Bar for Theme Toggle */
.top-navbar {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  z-index: 100;
}

.theme-toggle-btn {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: 50rem;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   3. LEFT SIDE PANEL (BRANDING & FEATURES)
   -------------------------------------------------------------------------- */
.left-panel {
  background-color: var(--left-bg);
  border-right: 1px solid var(--border-color);
  padding: 3rem 4rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: var(--transition-normal);
}

/* Subtle background accent glow */
.left-panel::before {
  content: '';
  position: absolute;
  top: -10%;
  left: -10%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, rgba(6, 182, 212, 0.02) 70%, transparent 100%);
  pointer-events: none;
}

/* Brand Header */
.brand-logo-container {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 2rem;
}

.brand-icon-box {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: #FFFFFF;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-md);
}

.brand-name {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-badge {
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--primary-light);
  color: var(--primary-color);
  padding: 0.2rem 0.55rem;
  border-radius: 50rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

/* Left Content Headlines */
.left-content {
  max-width: 520px;
  z-index: 1;
}

.system-title {
  font-size: 2.125rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.875rem;
  letter-spacing: -0.025em;
}

.system-description {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Feature Cards Grid */
.features-container {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: 2.5rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 0.875rem 1.25rem;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.feature-card:hover {
  transform: translateX(6px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.feature-icon-badge {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background-color: rgba(16, 185, 129, 0.12);
  color: var(--success-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.feature-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin: 0;
}

/* Illustration Container */
.illustration-wrapper {
  text-align: center;
  margin-top: 1rem;
}

.illustration-img {
  max-width: 100%;
  max-height: 280px;
  height: auto;
  filter: drop-shadow(0 10px 15px rgba(15, 23, 42, 0.08));
}

/* --------------------------------------------------------------------------
   4. RIGHT SIDE PANEL (ADMIN LOGIN CARD)
   -------------------------------------------------------------------------- */
.right-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  position: relative;
}

.login-card-container {
  width: 100%;
  max-width: 440px;
  z-index: 2;
}

.login-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem 2.25rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
}

.login-header {
  margin-bottom: 2rem;
}

.login-title-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--primary-light);
  color: var(--primary-color);
  padding: 0.35rem 0.75rem;
  border-radius: 50rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.login-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 0.4rem 0;
  letter-spacing: -0.02em;
}

.login-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   5. FORM INPUTS & CONTROLS
   -------------------------------------------------------------------------- */
.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.input-group {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.input-group-text {
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-right: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  padding-left: 0.875rem;
  padding-right: 0.6rem;
  transition: var(--transition-fast);
}

.form-control {
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 0.75rem 0.875rem;
  transition: var(--transition-fast);
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.form-control:focus {
  background-color: var(--input-bg);
  color: var(--text-primary);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px var(--primary-ring);
  outline: none;
}

/* When input group is focused */
.input-group:focus-within .input-group-text {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.input-group:focus-within {
  box-shadow: 0 0 0 4px var(--primary-ring);
}

/* Password Toggle Icon Button */
.btn-toggle-password {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-left: none;
  border-top-right-radius: 10px !important;
  border-bottom-right-radius: 10px !important;
  color: var(--text-muted);
  padding: 0.75rem 0.875rem;
  cursor: pointer;
  pointer-events: auto;
  transition: var(--transition-fast);
}

.btn-toggle-password:hover {
  color: var(--primary-color);
  background-color: var(--primary-light);
}

.btn-toggle-password:focus {
  outline: none;
  color: var(--primary-color);
}

/* Remember me & Forgot Password Flex Row */
.form-options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  margin-bottom: 1.75rem;
  font-size: 0.875rem;
}

.form-check-input {
  width: 1.1em;
  height: 1.1em;
  border-color: var(--input-border);
  background-color: var(--input-bg);
  cursor: pointer;
}

.form-check-input:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.form-check-label {
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  font-weight: 500;
}

.forgot-password-link {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-fast);
}

.forgot-password-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   6. BUTTONS & ACTIONS
   -------------------------------------------------------------------------- */
.btn-login-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: #FFFFFF;
  border: none;
  padding: 0.85rem 1.5rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-login-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
  color: #FFFFFF;
}

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

.btn-back-home {
  width: 100%;
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
  text-decoration: none;
  transition: var(--transition-fast);
}

.btn-back-home:hover {
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

/* Alert UI feedback box */
.alert-ui-feedback {
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  display: none;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
  padding: 0.75rem 1rem;
}

/* --------------------------------------------------------------------------
   7. FOOTER
   -------------------------------------------------------------------------- */
.login-footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.version-tag {
  background-color: var(--border-color);
  color: var(--text-secondary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.75rem;
}

/* --------------------------------------------------------------------------
   9. LOGIN FORM VALIDATION CLEANUP
   Remove Bootstrap valid checkmarks (✔) and green borders from login fields.
   -------------------------------------------------------------------------- */
.login-card .form-control:valid,
.login-card .was-validated .form-control:valid,
.login-card .form-control.is-valid,
.login-card .was-validated .form-control.is-valid {
  border-color: var(--input-border) !important;
  background-image: none !important;
  box-shadow: none !important;
}

.login-card .form-control:invalid,
.login-card .was-validated .form-control:invalid,
.login-card .form-control.is-invalid,
.login-card .was-validated .form-control.is-invalid {
  border-color: #dc3545 !important;
  background-image: none !important;
}

.login-card .input-group:focus-within .form-control {
  border-color: var(--primary-color) !important;
}

.login-card input[type="password"],
.login-card input[name="password"],
.login-card .btn-toggle-password {
  background-image: none !important;
}

/* --------------------------------------------------------------------------
   8. RESPONSIVE BREAKPOINTS (MOBILE & TABLET)
   -------------------------------------------------------------------------- */
@media (max-width: 991.98px) {
  .left-panel {
    display: none !important;
  }
  
  .right-panel {
    min-height: 100vh;
    padding: 4rem 1.25rem 2rem 1.25rem;
  }

  .login-card {
    padding: 2rem 1.5rem;
  }

  .top-navbar {
    top: 1rem;
    right: 1rem;
  }
}

@media (min-width: 992px) {
  .left-panel {
    min-height: 100vh;
  }
  
  .right-panel {
    min-height: 100vh;
  }
}

@media (max-width: 575.98px) {
  .right-panel {
    padding: 3.5rem 0.75rem 1.5rem 0.75rem;
  }
  .login-card {
    padding: 1.5rem 1rem;
    border-radius: 14px;
  }
  .form-control {
    font-size: 16px !important;
  }
}