:root {
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --bg-primary: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-hover: #334155;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.15);
    --success: #10b981;
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.15);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.5;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease;

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

code {
    font-family: var(--font-mono);
    background-color: rgba(255, 255, 255, 0.08);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

/* Navbar */
.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);

    .nav-brand {
        font-weight: 700;
        font-size: 1.25rem;
        color: var(--text-primary);
        letter-spacing: -0.025em;

        span {
            color: var(--primary);
        }
    }

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

        .user-avatar {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            border: 2px solid var(--border-color);
            object-fit: cover;
        }

        .user-name {
            font-weight: 500;
            color: var(--text-primary);
        }

        .badge {
            font-size: 0.75rem;
            padding: 0.15rem 0.5rem;
            border-radius: 9999px;
            background: var(--primary-light);
            color: var(--primary);
            text-transform: uppercase;
            font-weight: 600;
        }
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    text-decoration: none;

    &.btn-primary {
        background-color: var(--primary);
        color: #ffffff;

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

    &.btn-secondary {
        background-color: var(--bg-surface-hover);
        color: var(--text-primary);
        border-color: var(--border-color);

        &:hover {
            background-color: #475569;
        }
    }

    &.btn-danger {
        background-color: var(--danger-light);
        color: var(--danger);
        border-color: var(--danger);

        &:hover {
            background-color: var(--danger);
            color: #ffffff;
        }
    }

    &.btn-sm {
        padding: 0.25rem 0.6rem;
        font-size: 0.8rem;
    }
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;

    label {
        display: block;
        font-size: 0.875rem;
        font-weight: 500;
        color: var(--text-secondary);
        margin-bottom: 0.375rem;
    }

    input, select, textarea {
        width: 100%;
        padding: 0.625rem 0.875rem;
        background-color: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-sm);
        color: var(--text-primary);
        font-family: inherit;
        font-size: 0.9rem;
        outline: none;
        transition: border-color 0.15s ease;

        &:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 2px var(--primary-light);
        }
    }

    .form-error {
        color: var(--danger);
        font-size: 0.8rem;
        margin-top: 0.25rem;
    }
}

/* Dashboard Layout */
.dashboard-layout {
    display: flex;
    flex: 1;
    min-height: calc(100vh - 67px);

    .dashboard-sidebar {
        width: 240px;
        background-color: var(--bg-surface);
        border-right: 1px solid var(--border-color);
        padding: 1.5rem 1rem;

        nav {
            display: flex;
            flex-direction: column;
            gap: 0.375rem;

            a {
                display: flex;
                align-items: center;
                gap: 0.75rem;
                padding: 0.625rem 0.875rem;
                border-radius: var(--radius-sm);
                color: var(--text-secondary);
                font-weight: 500;
                font-size: 0.9rem;

                &:hover {
                    background-color: var(--bg-surface-hover);
                    color: var(--text-primary);
                }

                &.active {
                    background-color: var(--primary-light);
                    color: var(--primary);
                    font-weight: 600;
                }
            }
        }
    }

    .dashboard-content {
        flex: 1;
        padding: 2rem;
        max-width: 1200px;
    }
}

/* Cards & Grids */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;

    .stat-card {
        background-color: var(--bg-surface);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        padding: 1.25rem;
        display: flex;
        flex-direction: column;

        .stat-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 0.25rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
    }
}

.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;

    .card-title {
        font-size: 1.15rem;
        font-weight: 600;
        margin-bottom: 1rem;
        color: var(--text-primary);
    }
}

/* Tables */
.table-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow-x: auto;

    table {
        width: 100%;
        border-collapse: collapse;
        font-size: 0.9rem;

        th, td {
            padding: 0.875rem 1rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background-color: rgba(0, 0, 0, 0.2);
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.8rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        tbody tr:hover {
            background-color: rgba(255, 255, 255, 0.02);
        }
    }
}

/* Alerts */
.alert {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    font-size: 0.9rem;

    &.alert-error {
        background-color: var(--danger-light);
        color: var(--danger);
        border: 1px solid var(--danger);
    }

    &.alert-success {
        background-color: rgba(16, 185, 129, 0.15);
        color: var(--success);
        border: 1px solid var(--success);
    }
}

/* Landing & Centered Pages */
.hero-centered {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
    text-align: center;
    padding: 2rem;

    h1 {
        font-size: 3rem;
        font-weight: 800;
        margin-bottom: 1rem;
        letter-spacing: -0.03em;
        background: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    p {
        font-size: 1.2rem;
        color: var(--text-secondary);
        max-width: 600px;
        margin-bottom: 2rem;
    }
}