/**
 * UTM Builder - Design System Variables
 *
 * Unified color palette and design tokens for consistent styling.
 * Import this file before other stylesheets.
 */

:root {
    /* === Primary Colors === */
    --color-primary: #3182ce;
    --color-primary-hover: #2c5282;
    --color-primary-light: #ebf8ff;
    --color-primary-dark: #2a4365;

    /* === Secondary Colors === */
    --color-secondary: #718096;
    --color-secondary-hover: #4a5568;
    --color-secondary-light: #edf2f7;
    --color-secondary-dark: #2d3748;

    /* === Success Colors === */
    --color-success: #38a169;
    --color-success-hover: #2f855a;
    --color-success-light: #f0fff4;
    --color-success-dark: #276749;
    --color-success-border: #9ae6b4;

    /* === Warning Colors === */
    --color-warning: #d69e2e;
    --color-warning-hover: #b7791f;
    --color-warning-light: #fffaf0;
    --color-warning-dark: #975a16;
    --color-warning-border: #fbd38d;

    /* === Danger/Error Colors === */
    --color-danger: #e53e3e;
    --color-danger-hover: #c53030;
    --color-danger-light: #fff5f5;
    --color-danger-dark: #9b2c2c;
    --color-danger-border: #feb2b2;

    /* === Info Colors === */
    --color-info: #4299e1;
    --color-info-hover: #3182ce;
    --color-info-light: #ebf8ff;
    --color-info-dark: #2b6cb0;
    --color-info-border: #90cdf4;

    /* === Neutral/Gray Colors === */
    --color-gray-50: #f7fafc;
    --color-gray-100: #edf2f7;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e0;
    --color-gray-400: #a0aec0;
    --color-gray-500: #718096;
    --color-gray-600: #4a5568;
    --color-gray-700: #2d3748;
    --color-gray-800: #1a202c;
    --color-gray-900: #171923;

    /* === Background Colors === */
    --color-bg: #ffffff;
    --color-bg-secondary: #f7fafc;
    --color-bg-tertiary: #edf2f7;

    /* === Text Colors === */
    --color-text: #2d3748;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-text-light: #a0aec0;
    --color-text-inverse: #ffffff;

    /* === Border Colors === */
    --color-border: #e2e8f0;
    --color-border-dark: #cbd5e0;
    --color-border-light: #edf2f7;

    /* === Typography === */
    --font-family-base: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'Monaco', 'Courier New', Consolas, monospace;

    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --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-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.75;

    /* === Spacing === */
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */

    /* === Border Radius === */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.375rem;  /* 6px */
    --radius-lg: 0.5rem;    /* 8px */
    --radius-xl: 0.75rem;   /* 12px */
    --radius-2xl: 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;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* === Z-Index === */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* === Base Styles === */
body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

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

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

/* === Buttons (Base) === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

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

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

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

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

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

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

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

.btn-outline:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border-color: var(--color-gray-400);
}

/* === Cards === */
.card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: var(--spacing-4) var(--spacing-6);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-body {
    padding: var(--spacing-6);
}

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

.table th {
    text-align: left;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 2px solid var(--color-border);
    background-color: var(--color-bg-secondary);
}

.table td {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

.table tbody tr:hover {
    background-color: var(--color-bg-secondary);
}

.table-striped tbody tr:nth-child(odd) {
    background-color: var(--color-bg-secondary);
}

/* === Alerts === */
.alert {
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-sm);
}

.alert-success {
    background-color: var(--color-success-light);
    border: 1px solid var(--color-success-border);
    color: var(--color-success-dark);
}

.alert-danger {
    background-color: var(--color-danger-light);
    border: 1px solid var(--color-danger-border);
    color: var(--color-danger-dark);
}

.alert-warning {
    background-color: var(--color-warning-light);
    border: 1px solid var(--color-warning-border);
    color: var(--color-warning-dark);
}

.alert-info {
    background-color: var(--color-info-light);
    border: 1px solid var(--color-info-border);
    color: var(--color-info-dark);
}

/* === Badges === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-sm);
}

.badge-primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

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

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

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

/* === Forms === */
.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

/* === Language Switcher === */
.language-switcher {
    display: inline-flex;
    gap: var(--spacing-1);
}

.language-switcher .lang-option {
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.language-switcher .lang-option:hover {
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

.language-switcher .lang-option.active {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

/* === Icons === */
.icon {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}