/**
 * Professional Design System
 * Standardized fonts, colors, buttons, and cards for the entire website
 */

/* ============================================
   FONT SYSTEM
   ============================================ */
:root {
    /* Font Family - Professional Sans-serif */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-monospace: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Font Sizes - Standard Professional Scale */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;        /* 16px - Base */
    --font-size-lg: 1.125rem;      /* 18px */
    --font-size-xl: 1.25rem;       /* 20px */
    --font-size-2xl: 1.5rem;       /* 24px */
    --font-size-3xl: 1.875rem;     /* 30px */
    --font-size-4xl: 2.25rem;      /* 36px */
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* ============================================
       COLOR SYSTEM
       ============================================ */
    
    /* Primary Colors - Professional Blue */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-primary-lighter: #dbeafe;
    
    /* Secondary Colors */
    --color-secondary: #64748b;
    --color-secondary-dark: #475569;
    --color-secondary-light: #94a3b8;
    
    /* Success Colors */
    --color-success: #10b981;
    --color-success-dark: #059669;
    --color-success-light: #d1fae5;
    
    /* Warning Colors */
    --color-warning: #f59e0b;
    --color-warning-dark: #d97706;
    --color-warning-light: #fef3c7;
    
    /* Danger/Error Colors */
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;
    --color-danger-light: #fee2e2;
    
    /* Neutral Colors */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Text Colors */
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-text-inverse: #ffffff;
    
    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    
    /* Border Colors */
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    --color-border-dark: #d1d5db;
    
    /* ============================================
       SPACING SYSTEM
       ============================================ */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */
    --spacing-3xl: 4rem;      /* 64px */
    
    /* ============================================
       BORDER RADIUS
       ============================================ */
    --radius-sm: 0.25rem;     /* 4px */
    --radius-md: 0.5rem;      /* 8px */
    --radius-lg: 0.75rem;     /* 12px */
    --radius-xl: 1rem;        /* 16px */
    --radius-full: 9999px;
    
    /* ============================================
       SHADOWS
       ============================================ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* ============================================
       TRANSITIONS
       ============================================ */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

/* ============================================
   BASE TYPOGRAPHY
   ============================================ */
* {
    font-family: var(--font-primary);
}

body {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-md) 0;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
    margin: 0 0 var(--spacing-md) 0;
    line-height: var(--line-height-relaxed);
}

small {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   BUTTON SYSTEM
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.625rem 1.25rem; /* 10px 20px */
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem; /* 8px 16px */
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: 0.75rem 1.5rem; /* 12px 24px */
    font-size: var(--font-size-base);
}

/* Button Variants */
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

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

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-text-inverse);
    border-color: var(--color-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
}

.btn-success {
    background-color: var(--color-success);
    color: var(--color-text-inverse);
    border-color: var(--color-success);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--color-success-dark);
    border-color: var(--color-success-dark);
}

.btn-warning {
    background-color: var(--color-warning);
    color: var(--color-text-inverse);
    border-color: var(--color-warning);
}

.btn-warning:hover:not(:disabled) {
    background-color: var(--color-warning-dark);
    border-color: var(--color-warning-dark);
}

.btn-danger {
    background-color: var(--color-danger);
    color: var(--color-text-inverse);
    border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--color-danger-dark);
    border-color: var(--color-danger-dark);
}

.btn-default,
.btn-outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border-dark);
}

.btn-default:hover:not(:disabled),
.btn-outline:hover:not(:disabled) {
    background-color: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

/* ============================================
   CARD SYSTEM
   ============================================ */
.card {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
}

.card-body {
    padding: var(--spacing-md) 0;
}

.card-footer {
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* Card Variants */
.card-primary {
    border-color: var(--color-primary-lighter);
    background: linear-gradient(135deg, var(--color-primary-lighter) 0%, var(--color-bg-primary) 100%);
}

.card-success {
    border-color: var(--color-success-light);
    background: linear-gradient(135deg, var(--color-success-light) 0%, var(--color-bg-primary) 100%);
}

.card-warning {
    border-color: var(--color-warning-light);
    background: linear-gradient(135deg, var(--color-warning-light) 0%, var(--color-bg-primary) 100%);
}

.card-danger {
    border-color: var(--color-danger-light);
    background: linear-gradient(135deg, var(--color-danger-light) 0%, var(--color-bg-primary) 100%);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="date"],
input[type="time"],
input[type="url"],
select,
textarea {
    width: 100%;
    padding: 0.625rem 0.75rem; /* 10px 12px */
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    box-sizing: border-box;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-lighter);
}

input:disabled,
select:disabled,
textarea:disabled {
    background-color: var(--color-gray-100);
    cursor: not-allowed;
    opacity: 0.6;
}

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

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   TABLE SYSTEM
   ============================================ */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

table th {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    text-align: left;
    padding: 0.75rem; /* 12px */
    background-color: var(--color-gray-50);
    border-bottom: 2px solid var(--color-border-dark);
}

table td {
    font-size: var(--font-size-sm);
    padding: 0.75rem; /* 12px */
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

table tr:hover {
    background-color: var(--color-gray-50);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-gray-100); }
.bg-success { background-color: var(--color-success-light); }
.bg-warning { background-color: var(--color-warning-light); }
.bg-danger { background-color: var(--color-danger-light); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.125rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: var(--font-size-xs);
    }
    
    .card {
        padding: var(--spacing-md);
    }
}