/* Main CSS - Variables and global styles */

:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;

    /* Background colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #1e293b;
    --bg-darker: #0f172a;

    /* Text colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;

    /* Border colors */
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;

    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Font sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;

    /* Transitions */
    --transition-fast: 150ms;
    --transition-base: 200ms;
    --transition-slow: 300ms;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Typography */
h1 {
    font-size: var(--text-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-md);
}

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

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

/* Buttons */
button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--text-base);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

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

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

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

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

.btn-danger:hover {
    background-color: #dc2626;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Forms */
input,
textarea,
select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--text-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

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

/* Loading spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-spinner,
.loading-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
}

/* Messages */
.error-message {
    padding: var(--spacing-md);
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.success-message {
    padding: var(--spacing-md);
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.warning-message {
    padding: var(--spacing-md);
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-large {
    max-width: 90%;
    max-height: 90%;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* Utility classes */
.text-center {
    text-align: center;
}

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none !important;
}