:root {
    --primary: #4361ee;
    --primary-hover: #3a0ca3;
    --secondary: #2b2d42;
    --background: #f8f9fa;
    --surface: #ffffff;
    --text-main: #212529;
    --text-muted: #6c757d;
    --border: #e9ecef;
    --success: #2ecc71;
    --danger: #e74c3c;
    --warning: #f39c12;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 24px;
    --shadow-sm: 0 4px 6px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.12);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

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

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

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 10px rgba(67, 97, 238, 0.3);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(67, 97, 238, 0.4);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--secondary);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--surface);
    transition: var(--transition);
    color: var(--text-main);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.1);
}

/* Login Page Specific */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.login-card {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    animation: slideUpFade 0.6s ease-out forwards;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 1.8rem;
    color: var(--secondary);
}

.login-header p {
    color: var(--text-muted);
}

/* Error/Success Messages */
.alert {
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--danger);
    border: 1px solid rgba(231, 76, 60, 0.2);
}

.alert-success {
    background-color: rgba(46, 204, 113, 0.1);
    color: var(--success);
    border: 1px solid rgba(46, 204, 113, 0.2);
}

/* Animations */
@keyframes slideUpFade {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* CRM Layout Styles */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: #1e1e2d;
    color: #a2a3b7;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: var(--transition);
}

.sidebar-brand {
    padding: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 1rem;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li {
    margin-bottom: 0.2rem;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 1.5rem;
    color: #a2a3b7;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.sidebar-menu a:hover, .sidebar-menu a.active {
    background-color: #1b1b28;
    color: var(--primary);
    border-left: 3px solid var(--primary);
}

.sidebar-submenu {
    list-style: none;
    padding: 0;
    margin: 0;
    background-color: #1b1b28;
    display: none; /* Hidden by default */
}

.sidebar-submenu.show {
    display: block;
}

.sidebar-submenu a {
    padding: 0.6rem 1.5rem 0.6rem 3rem;
    font-size: 0.9rem;
    border-left: none;
}

.sidebar-submenu a:hover, .sidebar-submenu a.active {
    color: white;
    border-left: none;
}

.caret {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.has-submenu.open .caret {
    transform: rotate(180deg);
}

.main-content {
    flex: 1;
    margin-left: 260px;
    background-color: var(--background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    height: 70px;
    background-color: var(--surface);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 90;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.page-wrapper {
    padding: 2rem;
    flex: 1;
}