@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
    /* 
     * Core Colors
     * Slate & Indigo theme for enterprise feel 
     */
    --color-primary: #4F46E5; /* Indigo 600 */
    --color-primary-hover: #4338CA; /* Indigo 700 */
    --color-primary-light: #EEF2FF; /* Indigo 50 */
    --color-primary-dark: #312E81; /* Indigo 900 */
    
    --color-secondary: #0F172A; /* Slate 900 */
    --color-secondary-light: #F8FAFC; /* Slate 50 */
    
    --color-success: #10B981;
    --color-success-light: #D1FAE5;
    --color-warning: #F59E0B;
    --color-warning-light: #FEF3C7;
    --color-danger: #EF4444;
    --color-danger-light: #FEE2E2;
    --color-info: #3B82F6;
    --color-info-light: #DBEAFE;

    /* Backgrounds & Surfaces */
    --color-background: #F8FAFC; /* Light gray for app background */
    --color-surface: #FFFFFF; /* Pure white for cards/panels */
    --color-surface-hover: #F1F5F9;

    /* Text Colors */
    --text-primary: #0F172A; /* Slate 900 for main text */
    --text-secondary: #475569; /* Slate 600 for secondary text */
    --text-tertiary: #94A3B8; /* Slate 400 for placeholders/disabled */
    --text-inverse: #FFFFFF;

    /* Borders */
    --border-color: #E2E8F0; /* Slate 200 */
    --border-focus: #C7D2FE; /* Indigo 200 */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 0.375rem; /* 6px */
    --radius-md: 0.5rem;   /* 8px */
    --radius-lg: 0.75rem;  /* 12px */
    --radius-xl: 1rem;     /* 16px */
    --radius-full: 9999px;

    /* 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-12: 3rem;    /* 48px */
    --spacing-16: 4rem;    /* 64px */

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index Layers */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-drawer: 300;
    --z-modal: 400;
    --z-toast: 500;

    /* Responsive Font Sizes */
    --fs-xs: 0.75rem;   /* 12px */
    --fs-sm: 0.875rem;  /* 14px */
    --fs-base: 1rem;    /* 16px */
    --fs-lg: 1.125rem;  /* 18px */
    --fs-xl: 1.25rem;   /* 20px */
    --fs-2xl: 1.5rem;   /* 24px */
    --fs-3xl: 1.875rem; /* 30px */

    /* Touch Targets */
    --touch-target: 44px;
}

/* Global Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--color-background);
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    color: var(--text-primary);
    line-height: 1.2;
    font-weight: 600;
}

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

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

/* Reusable Utility Classes */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

.bg-surface { background-color: var(--color-surface); }
.bg-background { background-color: var(--color-background); }

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--fs-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: 'Inter', sans-serif;
    min-height: var(--touch-target);
    white-space: nowrap;
    user-select: none;
    touch-action: manipulation;
}

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

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

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

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

.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background-color: var(--color-surface-hover);
    color: var(--text-primary);
}

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
    margin-bottom: var(--spacing-4);
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--fs-base); /* Prevents iOS zoom on focus */
    color: var(--text-primary);
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-family: 'Inter', sans-serif;
    min-height: var(--touch-target);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder {
    color: var(--text-tertiary);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-success { background-color: var(--color-success-light); color: var(--color-success); }
.badge-warning { background-color: var(--color-warning-light); color: var(--color-warning); }
.badge-danger { background-color: var(--color-danger-light); color: var(--color-danger); }
.badge-info { background-color: var(--color-info-light); color: var(--color-info); }