/* Modern Professional Design System */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #1e293b;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border-color: #e2e8f0;
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: #f5f7fa;
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand::before {
    content: "";
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    display: inline-block;
    margin-right: 0.5rem;
    -webkit-text-fill-color: initial;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    list-style: none;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.nav-links a.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

/* Auth Pages */
.auth-container {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 3rem;
    width: 100%;
    max-width: 450px;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.auth-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.form-group ul {
    list-style: none;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--error-color);
}

.form-group .helptext {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

/* Dashboard */
.dashboard-container {
    min-height: calc(100vh - 80px);
    padding: 2rem;
    background: #f5f7fa;
}

.dashboard-header {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    margin-bottom: 2rem;
    animation: slideUp 0.5s ease-out;
}

.dashboard-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.dashboard-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    transition: all 0.3s ease;
    animation: slideUp 0.5s ease-out;
    animation-fill-mode: both;
}

.dashboard-card:nth-child(1) { animation-delay: 0.1s; }
.dashboard-card:nth-child(2) { animation-delay: 0.2s; }
.dashboard-card:nth-child(3) { animation-delay: 0.3s; }

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.dashboard-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dashboard-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.dashboard-card .icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Messages */
.messages {
    list-style: none;
    margin-bottom: 1.5rem;
}

.messages li {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    animation: slideUp 0.3s ease-out;
}

.messages .success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.messages .error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--error-color);
}

.messages .info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
    }

    .nav-links a {
        width: 100%;
        text-align: center;
    }

    .auth-card {
        padding: 2rem 1.5rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 1rem;
    }
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Select Dropdown Styling */
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236366f1' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group select option {
    padding: 0.5rem;
}

/* User Info in Nav */
.user-info {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
}

/* Enhanced Card Styles */
.dashboard-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.dashboard-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

/* Professional Gradient Cards */
.dashboard-card.gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.dashboard-card.gradient h3,
.dashboard-card.gradient p {
    color: white;
}

/* Enhanced Button Styles */
.btn {
    font-weight: 600;
    letter-spacing: 0.025em;
    text-transform: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Improved Form Styling */
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="date"],
.form-group input[type="datetime-local"],
.form-group textarea {
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Role Badge Styles */
.role-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.role-badge.project-manager {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.role-badge.team-member {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.role-badge.viewer {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

/* Enhanced Empty State */
.empty-state {
    background: var(--bg-primary);
    border: 2px dashed var(--border-color);
}

.empty-state-icon {
    color: var(--primary-color);
}

/* Smooth Transitions */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Professional Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}