@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Colors - Light Theme */
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-color: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    
    /* Semantic Colors */
    --success-bg: #ecfdf5;
    --success-text: #059669;
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    --error-text: #dc2626;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;
    --warning-text: #d97706;

    /* Shadows & Effects */
    --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);
    
    /* Border Radius */
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Base Card Style */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
}

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

/* Base Typography */
h1, h2, h3 {
    font-weight: 600;
    color: var(--text-main);
}

h1 { font-size: 1.5rem; margin-bottom: 1.5rem; }
h2 { font-size: 1.25rem; margin-bottom: 1rem; }

/* Base Inputs */
input[type="text"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    color: var(--text-main);
    background-color: #fff;
    transition: all 0.2s ease;
    outline: none;
}

input:focus,
select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Base Buttons */
button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--primary-color);
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Alerts / Messages */
.alert {
    padding: 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    font-size: 0.9rem;
    animation: slideIn 0.3s ease-out;
}

.alert-error {
    background-color: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
}

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

.alert-success {
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid #a7f3d0;
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0;
}

.nav-tab {
    padding: 12px 24px;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.nav-tab:hover {
    color: var(--primary-hover);
    background: #f1f5f9;
    border-radius: 8px 8px 0 0;
}

.nav-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-bg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.open .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.modal-close {
    background: transparent;
    color: var(--text-muted);
    font-size: 1.5rem;
    padding: 4px 8px;
    line-height: 1;
    cursor: pointer;
}

.modal-close:hover {
    background: #f1f5f9;
    color: var(--error-text);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
}