/* Modern Color Palette */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --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);
    --border-radius: 0.75rem;
    --border-radius-sm: 0.5rem;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-primary);
    font-size: 16px;
}

/* Login Container */
.login-container {
    max-width: 420px;
    margin: 10vh auto;
    background: var(--surface-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.login-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.875rem;
}

/* Form Elements */
input, button, select, textarea {
    width: 100%;
    margin-bottom: 1rem;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
    font-family: inherit;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.primary-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.secondary-btn {
    background: var(--surface-color);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.secondary-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.error {
    color: var(--error-color);
    background: rgb(239 68 68 / 0.1);
    padding: 0.875rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgb(239 68 68 / 0.2);
    margin-top: 1rem;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

th, td {
    padding: 1rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

tr:hover {
    background: rgb(99 102 241 / 0.04);
}

tr:nth-child(even) {
    background: rgb(248 250 252 / 0.5);
}

/* Textarea */
textarea {
    min-height: 80px;
    resize: vertical;
    font-family: inherit;
}

/* Canvas/Charts */
canvas {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }

/* Responsive Design */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }
    
    .login-container {
        margin: 5vh 1rem;
        padding: 2rem;
    }
    
    input, button, select, textarea {
        padding: 0.75rem;
    }
    
    th, td {
        padding: 0.75rem 0.5rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .login-container {
        margin: 2vh 0.5rem;
        padding: 1.5rem;
    }
    
    .login-container h2 {
        font-size: 1.5rem;
    }
}