/* ========================================
   Design Tokens (CSS Variables)
   ======================================== */
:root {
  /* Brand Colors */
  --gradient-start: #667eea;
  --gradient-end: #764ba2;
  --brand-gradient: linear-gradient(
    135deg,
    var(--gradient-start) 0%,
    var(--gradient-end) 100%
  );

  /* Background Colors */
  --bg-primary: #1a1a2e;
  --bg-secondary: #2a2d3a;
  --bg-elevated: #353847;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;

  /* Text Colors */
  --text-primary: #eaeaea;
  --text-secondary: #b0b0b0;
  --text-accent: #8b9aff;
  --text-white: #ffffff;
  --text-dark: #333333;
  --text-muted: #666666;

  /* Status Colors */
  --color-success-bg: #d4edda;
  --color-success-text: #155724;
  --color-success: #4caf50;
  --color-error-bg: #ffebee;
  --color-error-text: #c62828;
  --color-error: #dc3545;
  --color-warning-bg: #fff3cd;
  --color-warning-text: #856404;
  --color-warning: #ff9800;
  --color-info: #667eea;

  /* Neutral Colors */
  --color-gray-light: #ccc;
  --color-gray: #6c757d;
  --color-gray-dark: #343a40;
  --color-border: #e0e0e0;
  --color-border-dark: #333;

  /* Spacing Scale (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Typography */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 4px 12px rgba(102, 126, 234, 0.3);
  --shadow-glow-lg: 0 6px 16px rgba(102, 126, 234, 0.4);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Global Resets & Base Styles
   ======================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  padding-bottom: 60px;
  background-color: var(--bg-primary) !important;
  color: var(--text-primary) !important;
  line-height: var(--line-height-relaxed);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI Variable", "Segoe UI", Helvetica, Arial, sans-serif;
  font-feature-settings: "ss01", "ss02", "cv01", "cv02";
}

/* Links */
a {
  color: var(--gradient-start);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  color: var(--gradient-end);
}

/* Code */
code,
pre {
  font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
  background-color: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

pre {
  padding: var(--space-4);
  overflow-x: auto;
}

/* Lists */
ul,
ol {
  margin: 0 0 var(--space-4) 0;
  padding-left: var(--space-6);
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: var(--line-height-tight);
  margin-top: 0;
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-4);
  text-align: center;
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

/* ========================================
   Navigation Bar
   ======================================== */
nav {
  background: var(--brand-gradient);
  padding: var(--space-2) var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: none;
  box-shadow: var(--shadow-md);
}

nav a {
  margin: 0 var(--space-4);
  text-decoration: none;
  color: var(--text-white);
  font-weight: 600;
  transition: var(--transition-base);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
}

nav a:hover {
  background-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

nav button {
  color: var(--text-white);
  font-weight: 600;
  background: none !important;
  border: none !important;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  text-decoration: none;
  font-size: inherit;
  line-height: inherit;
  vertical-align: middle;
  transition: var(--transition-base);
  border-radius: var(--radius-sm);
}

nav button:hover {
  background-color: rgba(255, 255, 255, 0.15) !important;
  transform: translateY(-1px);
}

nav form {
  display: inline-flex;
  align-items: center;
  margin: 0;
  padding: 0;
}

nav span {
  color: var(--text-white) !important;
  font-weight: 500;
  margin: 0 var(--space-2);
}

/* ========================================
   Buttons
   ======================================== */
button,
.btn {
  padding: var(--space-3) var(--space-5);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: inherit;
  transition: var(--transition-base);
  display: inline-block;
  text-decoration: none;
}

button:not(.btn):not(nav button):not(.tab) {
  background: var(--brand-gradient);
  color: var(--text-white);
}

button:not(.btn):not(nav button):not(.tab):hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-primary {
  background: var(--brand-gradient);
  color: var(--text-white);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background-color: var(--color-gray);
  color: var(--text-white);
}

.btn-secondary:hover {
  background-color: #5a6268;
  transform: translateY(-1px);
}

.btn-danger {
  background-color: var(--color-error);
  color: var(--text-white);
}

.btn-danger:hover {
  background-color: #c82333;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
}

/* ========================================
   Forms
   ======================================== */
.form-inline {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}

.form-control {
  width: 60%;
  max-width: 400px;
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 600;
  color: var(--text-primary);
}

/* Text Inputs, Selects, Textareas */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
input[type="search"],
input[type="number"],
select,
textarea,
.form-group input:not([type="checkbox"]):not([type="radio"]),
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-3);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: var(--transition-base);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="url"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus,
.form-group input:not([type="checkbox"]):not([type="radio"]):focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--gradient-start);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
  background-color: var(--bg-elevated);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

textarea {
  resize: vertical;
  min-height: 100px;
}

/* Select Dropdowns */
select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23b0b0b0' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
  cursor: pointer;
}

select:focus {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23667eea' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
}

/* Checkboxes */
input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  cursor: pointer;
  position: relative;
  transition: var(--transition-base);
  vertical-align: middle;
  margin-right: var(--space-2);
}

input[type="checkbox"]:hover {
  border-color: var(--gradient-start);
}

input[type="checkbox"]:checked {
  background: var(--brand-gradient);
  border-color: var(--gradient-start);
}

input[type="checkbox"]:checked::before {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 14px;
  font-weight: bold;
}

input[type="checkbox"]:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

/* Labels with checkboxes */
label:has(input[type="checkbox"]) {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.form-group small {
  display: block;
  margin-top: var(--space-1);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* ========================================
   Cards & Sections
   ======================================== */
.card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}

.section {
  margin-top: var(--space-8);
  padding: var(--space-5);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Modals */
#nested-manager,
#edit-modal {
  max-height: 85vh;
  overflow-y: auto;
}

#nested-manager::-webkit-scrollbar,
#edit-modal::-webkit-scrollbar {
  width: 8px;
}

#nested-manager::-webkit-scrollbar-track,
#edit-modal::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
}

#nested-manager::-webkit-scrollbar-thumb,
#edit-modal::-webkit-scrollbar-thumb {
  background: var(--gradient-start);
  border-radius: var(--radius-sm);
}

#nested-manager::-webkit-scrollbar-thumb:hover,
#edit-modal::-webkit-scrollbar-thumb:hover {
  background: var(--gradient-end);
}

/* ========================================
   Tables
   ======================================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-5);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  overflow: hidden;
}

th,
td {
  text-align: left;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--brand-gradient);
  color: var(--text-white);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tr:nth-child(even) {
  background-color: rgba(248, 249, 250, 0.05);
}

tr:hover {
  background-color: rgba(102, 126, 234, 0.05);
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container-sm {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.text-center {
  text-align: center;
}

.mb-1 {
  margin-bottom: var(--space-1);
}
.mb-2 {
  margin-bottom: var(--space-2);
}
.mb-3 {
  margin-bottom: var(--space-3);
}
.mb-4 {
  margin-bottom: var(--space-4);
}
.mb-5 {
  margin-bottom: var(--space-5);
}
.mb-6 {
  margin-bottom: var(--space-6);
}

.mt-1 {
  margin-top: var(--space-1);
}
.mt-2 {
  margin-top: var(--space-2);
}
.mt-3 {
  margin-top: var(--space-3);
}
.mt-4 {
  margin-top: var(--space-4);
}
.mt-5 {
  margin-top: var(--space-5);
}
.mt-6 {
  margin-top: var(--space-6);
}

.mt-8 {
  margin-top: var(--space-8);
}

/* Display utilities */
.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
}

.flex-gap-3 {
  gap: var(--space-3);
}

.flex-gap-4 {
  gap: 15px;
}

.justify-between {
  justify-content: space-between;
}

.align-center {
  align-items: center;
}

/* Margin utilities */
.m-0 {
  margin: 0;
}

.p-0 {
  padding: 0;
}

/* ========================================
   Page Headers
   ======================================== */
.header {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-border-dark);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  margin-top: var(--space-10);
  padding: var(--space-5) 0;
  width: 100%;
  text-align: center;
  color: var(--text-secondary);
}