/* HR Tools - Shared Design System */

/* ================================
   CSS Reset
   ================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ================================
   CSS Variables - Light Theme
   ================================ */
:root {
    /* Primary Colors */
    --primary: #00316A;
    --primary-dark: #002451;
    --primary-light: #004080;

    /* Semantic Colors */
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;

    /* Gray Scale */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic Backgrounds */
    --card-bg: white;
    --body-bg: var(--gray-100);
    --input-bg: white;
    --error-bg: #fef2f2;
    --error-border: #fecaca;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'Menlo', 'Consolas', 'Courier New', monospace;

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* ================================
   CSS Variables - Dark Theme
   ================================ */
[data-theme="dark"] {
    --primary: #4a8fd9;
    --primary-dark: #00316A;
    --primary-light: #6ba3e0;

    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;

    --gray-50: #1f2937;
    --gray-100: #111827;
    --gray-200: #374151;
    --gray-300: #4b5563;
    --gray-400: #6b7280;
    --gray-500: #9ca3af;
    --gray-600: #d1d5db;
    --gray-700: #e5e7eb;
    --gray-800: #f3f4f6;
    --gray-900: #f9fafb;

    --card-bg: #1f2937;
    --body-bg: #111827;
    --input-bg: #374151;
    --error-bg: #450a0a;
    --error-border: #7f1d1d;
}

/* ================================
   Base Styles
   ================================ */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--body-bg);
    color: var(--gray-900);
    line-height: 1.5;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ================================
   Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--gray-900);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.125rem; }

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* ================================
   Card Component
   ================================ */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-normal);
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ================================
   Button Components
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
}

.btn-gradient {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
}

.btn-gradient:hover:not(:disabled) {
    opacity: 0.9;
}

/* ================================
   Form Elements
   ================================ */
.input,
.textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 1rem;
    font-family: var(--font-sans);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: var(--input-bg);
    color: var(--gray-900);
    transition: border-color var(--transition-fast), background-color var(--transition-normal);
}

.input:focus,
.textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.input.error,
.textarea.error {
    border-color: var(--danger);
    background-color: var(--error-bg);
}

.textarea {
    font-family: var(--font-mono);
    resize: vertical;
    min-height: 150px;
}

label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--gray-700);
}

/* ================================
   Common Layout
   ================================ */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-6);
}

header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.header-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-4);
    position: relative;
}

.header-row h1 {
    font-size: 1.75rem;
}

.header-row .back-btn {
    position: absolute;
    left: 0;
}

.header-row .dark-mode-toggle {
    position: absolute;
    right: 0;
}

/* ================================
   Back Button
   ================================ */
.back-btn {
    background: var(--card-bg);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--space-2);
    cursor: pointer;
    color: var(--gray-700);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

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

.back-btn svg {
    width: 20px;
    height: 20px;
}

/* ================================
   Dark Mode Toggle
   ================================ */
.dark-mode-toggle {
    background: var(--card-bg);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--space-2);
    cursor: pointer;
    color: var(--gray-700);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-mode-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.dark-mode-toggle svg {
    width: 20px;
    height: 20px;
}

.dark-mode-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .dark-mode-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .dark-mode-toggle .icon-moon {
    display: block;
}

/* ================================
   Utility Classes
   ================================ */

/* Text Colors */
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--gray-500); }

/* Text Alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Font Sizes */
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }

/* Font Weights */
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* Spacing */
.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-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.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-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* Display */
.hidden { display: none; }

/* Width */
.w-full { width: 100%; }